1995 lines
63 KiB
C
1995 lines
63 KiB
C
//*****************************************************************************
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//
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// uart.c - Driver for the UART.
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//
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// Copyright (c) 2005-2017 Texas Instruments Incorporated. All rights reserved.
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// Software License Agreement
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//
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions
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// are met:
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//
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// Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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//
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// Redistributions in binary form must reproduce the above copyright
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// notice, this list of conditions and the following disclaimer in the
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// documentation and/or other materials provided with the
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// distribution.
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//
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// Neither the name of Texas Instruments Incorporated nor the names of
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// its contributors may be used to endorse or promote products derived
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// from this software without specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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//
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// This is part of revision 2.1.4.178 of the Tiva Peripheral Driver Library.
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//
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//*****************************************************************************
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//*****************************************************************************
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//
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//! \addtogroup uart_api
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//! @{
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//
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//*****************************************************************************
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#include <stdbool.h>
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#include <stdint.h>
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#include "inc/hw_ints.h"
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#include "inc/hw_memmap.h"
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#include "inc/hw_sysctl.h"
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#include "inc/hw_types.h"
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#include "inc/hw_uart.h"
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#include "driverlib/debug.h"
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#include "driverlib/interrupt.h"
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#include "driverlib/uart.h"
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//*****************************************************************************
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//
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// The system clock divider defining the maximum baud rate supported by the
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// UART.
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//
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//*****************************************************************************
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#define UART_CLK_DIVIDER 8
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//*****************************************************************************
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//
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// A mapping of UART base address to interrupt number.
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//
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//*****************************************************************************
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static const uint32_t g_ppui32UARTIntMap[][2] =
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{
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{ UART0_BASE, INT_UART0_TM4C123 },
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{ UART1_BASE, INT_UART1_TM4C123 },
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{ UART2_BASE, INT_UART2_TM4C123 },
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{ UART3_BASE, INT_UART3_TM4C123 },
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{ UART4_BASE, INT_UART4_TM4C123 },
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{ UART5_BASE, INT_UART5_TM4C123 },
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{ UART6_BASE, INT_UART6_TM4C123 },
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{ UART7_BASE, INT_UART7_TM4C123 },
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};
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static const uint_fast8_t g_ui8UARTIntMapRows =
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sizeof(g_ppui32UARTIntMap) / sizeof(g_ppui32UARTIntMap[0]);
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static const uint32_t g_ppui32UARTIntMapSnowflake[][2] =
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{
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{ UART0_BASE, INT_UART0_TM4C129 },
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{ UART1_BASE, INT_UART1_TM4C129 },
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{ UART2_BASE, INT_UART2_TM4C129 },
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{ UART3_BASE, INT_UART3_TM4C129 },
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{ UART4_BASE, INT_UART4_TM4C129 },
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{ UART5_BASE, INT_UART5_TM4C129 },
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{ UART6_BASE, INT_UART6_TM4C129 },
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{ UART7_BASE, INT_UART7_TM4C129 },
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};
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static const uint_fast8_t g_ui8UARTIntMapRowsSnowflake =
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sizeof(g_ppui32UARTIntMapSnowflake) /
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sizeof(g_ppui32UARTIntMapSnowflake[0]);
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//*****************************************************************************
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//
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//! \internal
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//! Checks a UART base address.
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//!
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//! \param ui32Base is the base address of the UART port.
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//!
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//! This function determines if a UART port base address is valid.
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//!
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//! \return Returns \b true if the base address is valid and \b false
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//! otherwise.
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//
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//*****************************************************************************
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#ifdef DEBUG
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static bool
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_UARTBaseValid(uint32_t ui32Base)
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{
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return((ui32Base == UART0_BASE) || (ui32Base == UART1_BASE) ||
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(ui32Base == UART2_BASE) || (ui32Base == UART3_BASE) ||
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(ui32Base == UART4_BASE) || (ui32Base == UART5_BASE) ||
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(ui32Base == UART6_BASE) || (ui32Base == UART7_BASE));
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}
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#endif
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//*****************************************************************************
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//
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//! \internal
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//! Gets the UART interrupt number.
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//!
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//! \param ui32Base is the base address of the UART port.
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//!
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//! Given a UART base address, this function returns the corresponding
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//! interrupt number.
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//!
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//! \return Returns a UART interrupt number, or 0 if \e ui32Base is invalid.
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//
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//*****************************************************************************
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static uint32_t
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_UARTIntNumberGet(uint32_t ui32Base)
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{
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uint_fast8_t ui8Idx, ui8Rows;
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const uint32_t (*ppui32UARTIntMap)[2];
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//
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// Default interrupt map.
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//
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ppui32UARTIntMap = g_ppui32UARTIntMap;
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ui8Rows = g_ui8UARTIntMapRows;
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if(CLASS_IS_TM4C129)
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{
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ppui32UARTIntMap = g_ppui32UARTIntMapSnowflake;
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ui8Rows = g_ui8UARTIntMapRowsSnowflake;
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}
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//
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// Loop through the table that maps UART base addresses to interrupt
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// numbers.
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//
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for(ui8Idx = 0; ui8Idx < ui8Rows; ui8Idx++)
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{
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//
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// See if this base address matches.
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//
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if(ppui32UARTIntMap[ui8Idx][0] == ui32Base)
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{
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//
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// Return the corresponding interrupt number.
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//
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return(ppui32UARTIntMap[ui8Idx][1]);
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}
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}
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//
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// The base address could not be found, so return an error.
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//
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return(0);
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}
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//*****************************************************************************
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//
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//! Sets the type of parity.
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//!
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//! \param ui32Base is the base address of the UART port.
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//! \param ui32Parity specifies the type of parity to use.
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//!
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//! This function configures the type of parity to use for transmitting and
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//! expect when receiving. The \e ui32Parity parameter must be one of
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//! \b UART_CONFIG_PAR_NONE, \b UART_CONFIG_PAR_EVEN, \b UART_CONFIG_PAR_ODD,
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//! \b UART_CONFIG_PAR_ONE, or \b UART_CONFIG_PAR_ZERO. The last two
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//! parameters allow direct control of the parity bit; it is always either one
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//! or zero based on the mode.
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//!
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//! \return None.
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//
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//*****************************************************************************
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void
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UARTParityModeSet(uint32_t ui32Base, uint32_t ui32Parity)
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{
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//
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// Check the arguments.
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//
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ASSERT(_UARTBaseValid(ui32Base));
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ASSERT((ui32Parity == UART_CONFIG_PAR_NONE) ||
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(ui32Parity == UART_CONFIG_PAR_EVEN) ||
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(ui32Parity == UART_CONFIG_PAR_ODD) ||
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(ui32Parity == UART_CONFIG_PAR_ONE) ||
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(ui32Parity == UART_CONFIG_PAR_ZERO));
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//
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// Set the parity mode.
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//
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HWREG(ui32Base + UART_O_LCRH) = ((HWREG(ui32Base + UART_O_LCRH) &
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~(UART_LCRH_SPS | UART_LCRH_EPS |
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UART_LCRH_PEN)) | ui32Parity);
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}
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//*****************************************************************************
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//
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//! Gets the type of parity currently being used.
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//!
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//! \param ui32Base is the base address of the UART port.
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//!
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//! This function gets the type of parity used for transmitting data and
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//! expected when receiving data.
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//!
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//! \return Returns the current parity settings, specified as one of
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//! \b UART_CONFIG_PAR_NONE, \b UART_CONFIG_PAR_EVEN, \b UART_CONFIG_PAR_ODD,
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//! \b UART_CONFIG_PAR_ONE, or \b UART_CONFIG_PAR_ZERO.
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//
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//*****************************************************************************
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uint32_t
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UARTParityModeGet(uint32_t ui32Base)
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{
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//
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// Check the arguments.
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//
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ASSERT(_UARTBaseValid(ui32Base));
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//
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// Return the current parity setting.
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//
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return(HWREG(ui32Base + UART_O_LCRH) &
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(UART_LCRH_SPS | UART_LCRH_EPS | UART_LCRH_PEN));
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}
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//*****************************************************************************
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//
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//! Sets the FIFO level at which interrupts are generated.
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//!
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//! \param ui32Base is the base address of the UART port.
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//! \param ui32TxLevel is the transmit FIFO interrupt level, specified as one
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//! of \b UART_FIFO_TX1_8, \b UART_FIFO_TX2_8, \b UART_FIFO_TX4_8,
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//! \b UART_FIFO_TX6_8, or \b UART_FIFO_TX7_8.
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//! \param ui32RxLevel is the receive FIFO interrupt level, specified as one of
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//! \b UART_FIFO_RX1_8, \b UART_FIFO_RX2_8, \b UART_FIFO_RX4_8,
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//! \b UART_FIFO_RX6_8, or \b UART_FIFO_RX7_8.
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//!
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//! This function configures the FIFO level at which transmit and receive
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//! interrupts are generated.
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//!
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//! \return None.
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//
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//*****************************************************************************
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void
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UARTFIFOLevelSet(uint32_t ui32Base, uint32_t ui32TxLevel,
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uint32_t ui32RxLevel)
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{
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//
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// Check the arguments.
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//
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ASSERT(_UARTBaseValid(ui32Base));
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ASSERT((ui32TxLevel == UART_FIFO_TX1_8) ||
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(ui32TxLevel == UART_FIFO_TX2_8) ||
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(ui32TxLevel == UART_FIFO_TX4_8) ||
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(ui32TxLevel == UART_FIFO_TX6_8) ||
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(ui32TxLevel == UART_FIFO_TX7_8));
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ASSERT((ui32RxLevel == UART_FIFO_RX1_8) ||
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(ui32RxLevel == UART_FIFO_RX2_8) ||
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(ui32RxLevel == UART_FIFO_RX4_8) ||
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(ui32RxLevel == UART_FIFO_RX6_8) ||
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(ui32RxLevel == UART_FIFO_RX7_8));
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//
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// Set the FIFO interrupt levels.
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//
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HWREG(ui32Base + UART_O_IFLS) = ui32TxLevel | ui32RxLevel;
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}
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//*****************************************************************************
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//
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//! Gets the FIFO level at which interrupts are generated.
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//!
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//! \param ui32Base is the base address of the UART port.
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//! \param pui32TxLevel is a pointer to storage for the transmit FIFO level,
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//! returned as one of \b UART_FIFO_TX1_8, \b UART_FIFO_TX2_8,
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//! \b UART_FIFO_TX4_8, \b UART_FIFO_TX6_8, or \b UART_FIFO_TX7_8.
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//! \param pui32RxLevel is a pointer to storage for the receive FIFO level,
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//! returned as one of \b UART_FIFO_RX1_8, \b UART_FIFO_RX2_8,
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//! \b UART_FIFO_RX4_8, \b UART_FIFO_RX6_8, or \b UART_FIFO_RX7_8.
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//!
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//! This function gets the FIFO level at which transmit and receive interrupts
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//! are generated.
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//!
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//! \return None.
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//
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//*****************************************************************************
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void
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UARTFIFOLevelGet(uint32_t ui32Base, uint32_t *pui32TxLevel,
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uint32_t *pui32RxLevel)
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{
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uint32_t ui32Temp;
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//
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// Check the arguments.
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//
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ASSERT(_UARTBaseValid(ui32Base));
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//
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// Read the FIFO level register.
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//
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ui32Temp = HWREG(ui32Base + UART_O_IFLS);
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//
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// Extract the transmit and receive FIFO levels.
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//
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*pui32TxLevel = ui32Temp & UART_IFLS_TX_M;
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*pui32RxLevel = ui32Temp & UART_IFLS_RX_M;
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}
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//*****************************************************************************
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//
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//! Sets the configuration of a UART.
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//!
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//! \param ui32Base is the base address of the UART port.
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//! \param ui32UARTClk is the rate of the clock supplied to the UART module.
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//! \param ui32Baud is the desired baud rate.
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//! \param ui32Config is the data format for the port (number of data bits,
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//! number of stop bits, and parity).
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//!
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//! This function configures the UART for operation in the specified data
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//! format. The baud rate is provided in the \e ui32Baud parameter and the
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//! data format in the \e ui32Config parameter.
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//!
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//! The \e ui32Config parameter is the logical OR of three values: the number
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//! of data bits, the number of stop bits, and the parity.
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//! \b UART_CONFIG_WLEN_8, \b UART_CONFIG_WLEN_7, \b UART_CONFIG_WLEN_6, and
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//! \b UART_CONFIG_WLEN_5 select from eight to five data bits per byte
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//! (respectively). \b UART_CONFIG_STOP_ONE and \b UART_CONFIG_STOP_TWO select
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//! one or two stop bits (respectively). \b UART_CONFIG_PAR_NONE,
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//! \b UART_CONFIG_PAR_EVEN, \b UART_CONFIG_PAR_ODD, \b UART_CONFIG_PAR_ONE,
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//! and \b UART_CONFIG_PAR_ZERO select the parity mode (no parity bit, even
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//! parity bit, odd parity bit, parity bit always one, and parity bit always
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//! zero, respectively).
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//!
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//! The peripheral clock is the same as the processor clock. The frequency of
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//! the system clock is the value returned by SysCtlClockGet() for TM4C123x
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//! devices or the value returned by SysCtlClockFreqSet() for TM4C129x devices,
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//! or it can be explicitly hard coded if it is constant and known (to save the
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//! code/execution overhead of a call to SysCtlClockGet() or fetch of the
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//! variable call holding the return value of SysCtlClockFreqSet()).
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//!
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//! The function disables the UART by calling UARTDisable() before changing the
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//! the parameters and enables the UART by calling UARTEnable().
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//!
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//! For Tiva parts that have the ability to specify the UART baud clock
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//! source (via UARTClockSourceSet()), the peripheral clock can be changed to
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//! PIOSC. In this case, the peripheral clock should be specified as
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//! 16,000,000 (the nominal rate of PIOSC).
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//!
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//! \return None.
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//
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//*****************************************************************************
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void
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UARTConfigSetExpClk(uint32_t ui32Base, uint32_t ui32UARTClk,
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uint32_t ui32Baud, uint32_t ui32Config)
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{
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uint32_t ui32Div;
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//
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// Check the arguments.
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//
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ASSERT(_UARTBaseValid(ui32Base));
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ASSERT(ui32Baud != 0);
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ASSERT(ui32UARTClk >= (ui32Baud * UART_CLK_DIVIDER));
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//
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// Stop the UART.
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//
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UARTDisable(ui32Base);
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//
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// Is the required baud rate greater than the maximum rate supported
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// without the use of high speed mode?
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//
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if((ui32Baud * 16) > ui32UARTClk)
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{
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//
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// Enable high speed mode.
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//
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HWREG(ui32Base + UART_O_CTL) |= UART_CTL_HSE;
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//
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// Half the supplied baud rate to compensate for enabling high speed
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// mode. This allows the following code to be common to both cases.
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//
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ui32Baud /= 2;
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}
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else
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{
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//
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// Disable high speed mode.
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//
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HWREG(ui32Base + UART_O_CTL) &= ~(UART_CTL_HSE);
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}
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//
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// Compute the fractional baud rate divider.
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//
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ui32Div = (((ui32UARTClk * 8) / ui32Baud) + 1) / 2;
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//
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// Set the baud rate.
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//
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HWREG(ui32Base + UART_O_IBRD) = ui32Div / 64;
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HWREG(ui32Base + UART_O_FBRD) = ui32Div % 64;
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//
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// Set parity, data length, and number of stop bits.
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//
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HWREG(ui32Base + UART_O_LCRH) = ui32Config;
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//
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// Clear the flags register.
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//
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HWREG(ui32Base + UART_O_FR) = 0;
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//
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// Start the UART.
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//
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UARTEnable(ui32Base);
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}
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//*****************************************************************************
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//
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//! Gets the current configuration of a UART.
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//!
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//! \param ui32Base is the base address of the UART port.
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//! \param ui32UARTClk is the rate of the clock supplied to the UART module.
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//! \param pui32Baud is a pointer to storage for the baud rate.
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//! \param pui32Config is a pointer to storage for the data format.
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//!
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//! This function determines the baud rate and data format for the UART, given
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//! an explicitly provided peripheral clock (hence the ExpClk suffix). The
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//! returned baud rate is the actual baud rate; it may not be the exact baud
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//! rate requested or an ``official'' baud rate. The data format returned in
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//! \e pui32Config is enumerated the same as the \e ui32Config parameter of
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//! UARTConfigSetExpClk().
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//!
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//! The peripheral clock is the same as the processor clock. The frequency of
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//! the system clock is the value returned by SysCtlClockGet() for TM4C123x
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//! devices or the value returned by SysCtlClockFreqSet() for TM4C129x devices,
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//! or it can be explicitly hard coded if it is constant and known (to save the
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//! code/execution overhead of a call to SysCtlClockGet() or fetch of the
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//! variable call holding the return value of SysCtlClockFreqSet()).
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//!
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//! For Tiva parts that have the ability to specify the UART baud clock
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//! source (via UARTClockSourceSet()), the peripheral clock can be changed to
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//! PIOSC. In this case, the peripheral clock should be specified as
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//! 16,000,000 (the nominal rate of PIOSC).
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//!
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//! \return None.
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//
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//*****************************************************************************
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void
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UARTConfigGetExpClk(uint32_t ui32Base, uint32_t ui32UARTClk,
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uint32_t *pui32Baud, uint32_t *pui32Config)
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{
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uint32_t ui32Int, ui32Frac;
|
|
|
|
//
|
|
// Check the arguments.
|
|
//
|
|
ASSERT(_UARTBaseValid(ui32Base));
|
|
|
|
//
|
|
// Compute the baud rate.
|
|
//
|
|
ui32Int = HWREG(ui32Base + UART_O_IBRD);
|
|
ui32Frac = HWREG(ui32Base + UART_O_FBRD);
|
|
*pui32Baud = (ui32UARTClk * 4) / ((64 * ui32Int) + ui32Frac);
|
|
|
|
//
|
|
// See if high speed mode enabled.
|
|
//
|
|
if(HWREG(ui32Base + UART_O_CTL) & UART_CTL_HSE)
|
|
{
|
|
//
|
|
// High speed mode is enabled so the actual baud rate is actually
|
|
// double what was just calculated.
|
|
//
|
|
*pui32Baud *= 2;
|
|
}
|
|
|
|
//
|
|
// Get the parity, data length, and number of stop bits.
|
|
//
|
|
*pui32Config = (HWREG(ui32Base + UART_O_LCRH) &
|
|
(UART_LCRH_SPS | UART_LCRH_WLEN_M | UART_LCRH_STP2 |
|
|
UART_LCRH_EPS | UART_LCRH_PEN));
|
|
}
|
|
|
|
//*****************************************************************************
|
|
//
|
|
//! Enables transmitting and receiving.
|
|
//!
|
|
//! \param ui32Base is the base address of the UART port.
|
|
//!
|
|
//! This function enables the UART and its transmit and receive FIFOs.
|
|
//!
|
|
//! \return None.
|
|
//
|
|
//*****************************************************************************
|
|
void
|
|
UARTEnable(uint32_t ui32Base)
|
|
{
|
|
//
|
|
// Check the arguments.
|
|
//
|
|
ASSERT(_UARTBaseValid(ui32Base));
|
|
|
|
//
|
|
// Enable the FIFO.
|
|
//
|
|
HWREG(ui32Base + UART_O_LCRH) |= UART_LCRH_FEN;
|
|
|
|
//
|
|
// Enable RX, TX, and the UART.
|
|
//
|
|
HWREG(ui32Base + UART_O_CTL) |= (UART_CTL_UARTEN | UART_CTL_TXE |
|
|
UART_CTL_RXE);
|
|
}
|
|
|
|
//*****************************************************************************
|
|
//
|
|
//! Disables transmitting and receiving.
|
|
//!
|
|
//! \param ui32Base is the base address of the UART port.
|
|
//!
|
|
//! This function disables the UART, waits for the end of transmission of the
|
|
//! current character, and flushes the transmit FIFO.
|
|
//!
|
|
//! \return None.
|
|
//
|
|
//*****************************************************************************
|
|
void
|
|
UARTDisable(uint32_t ui32Base)
|
|
{
|
|
//
|
|
// Check the arguments.
|
|
//
|
|
ASSERT(_UARTBaseValid(ui32Base));
|
|
|
|
//
|
|
// Wait for end of TX.
|
|
//
|
|
while(HWREG(ui32Base + UART_O_FR) & UART_FR_BUSY)
|
|
{
|
|
}
|
|
|
|
//
|
|
// Disable the FIFO.
|
|
//
|
|
HWREG(ui32Base + UART_O_LCRH) &= ~(UART_LCRH_FEN);
|
|
|
|
//
|
|
// Disable the UART.
|
|
//
|
|
HWREG(ui32Base + UART_O_CTL) &= ~(UART_CTL_UARTEN | UART_CTL_TXE |
|
|
UART_CTL_RXE);
|
|
}
|
|
|
|
//*****************************************************************************
|
|
//
|
|
//! Enables the transmit and receive FIFOs.
|
|
//!
|
|
//! \param ui32Base is the base address of the UART port.
|
|
//!
|
|
//! This functions enables the transmit and receive FIFOs in the UART.
|
|
//!
|
|
//! \return None.
|
|
//
|
|
//*****************************************************************************
|
|
void
|
|
UARTFIFOEnable(uint32_t ui32Base)
|
|
{
|
|
//
|
|
// Check the arguments.
|
|
//
|
|
ASSERT(_UARTBaseValid(ui32Base));
|
|
|
|
//
|
|
// Enable the FIFO.
|
|
//
|
|
HWREG(ui32Base + UART_O_LCRH) |= UART_LCRH_FEN;
|
|
}
|
|
|
|
//*****************************************************************************
|
|
//
|
|
//! Disables the transmit and receive FIFOs.
|
|
//!
|
|
//! \param ui32Base is the base address of the UART port.
|
|
//!
|
|
//! This function disables the transmit and receive FIFOs in the UART.
|
|
//!
|
|
//! \return None.
|
|
//
|
|
//*****************************************************************************
|
|
void
|
|
UARTFIFODisable(uint32_t ui32Base)
|
|
{
|
|
//
|
|
// Check the arguments.
|
|
//
|
|
ASSERT(_UARTBaseValid(ui32Base));
|
|
|
|
//
|
|
// Disable the FIFO.
|
|
//
|
|
HWREG(ui32Base + UART_O_LCRH) &= ~(UART_LCRH_FEN);
|
|
}
|
|
|
|
//*****************************************************************************
|
|
//
|
|
//! Enables SIR (IrDA) mode on the specified UART.
|
|
//!
|
|
//! \param ui32Base is the base address of the UART port.
|
|
//! \param bLowPower indicates if SIR Low Power Mode is to be used.
|
|
//!
|
|
//! This function enables SIR (IrDA) mode on the UART. If the \e bLowPower
|
|
//! flag is set, then SIR low power mode will be selected as well. This
|
|
//! function only has an effect if the UART has not been enabled by a call to
|
|
//! UARTEnable(). The call UARTEnableSIR() must be made before a call to
|
|
//! UARTConfigSetExpClk() because the UARTConfigSetExpClk() function calls the
|
|
//! UARTEnable() function. Another option is to call UARTDisable() followed by
|
|
//! UARTEnableSIR() and then enable the UART by calling UARTEnable().
|
|
//!
|
|
//! \note The availability of SIR (IrDA) operation varies with the Tiva
|
|
//! part in use. Please consult the datasheet for the part you are using to
|
|
//! determine whether this support is available.
|
|
//!
|
|
//! \return None.
|
|
//
|
|
//*****************************************************************************
|
|
void
|
|
UARTEnableSIR(uint32_t ui32Base, bool bLowPower)
|
|
{
|
|
//
|
|
// Check the arguments.
|
|
//
|
|
ASSERT(_UARTBaseValid(ui32Base));
|
|
|
|
//
|
|
// Enable SIR and SIRLP (if appropriate).
|
|
//
|
|
if(bLowPower)
|
|
{
|
|
HWREG(ui32Base + UART_O_CTL) |= (UART_CTL_SIREN | UART_CTL_SIRLP);
|
|
}
|
|
else
|
|
{
|
|
HWREG(ui32Base + UART_O_CTL) |= (UART_CTL_SIREN);
|
|
}
|
|
}
|
|
|
|
//*****************************************************************************
|
|
//
|
|
//! Disables SIR (IrDA) mode on the specified UART.
|
|
//!
|
|
//! \param ui32Base is the base address of the UART port.
|
|
//!
|
|
//! This function disables SIR(IrDA) mode on the UART. This function only has
|
|
//! an effect if the UART has not been enabled by a call to UARTEnable(). The
|
|
//! call UARTEnableSIR() must be made before a call to UARTConfigSetExpClk()
|
|
//! because the UARTConfigSetExpClk() function calls the UARTEnable() function.
|
|
//! Another option is to call UARTDisable() followed by UARTEnableSIR() and
|
|
//! then enable the UART by calling UARTEnable().
|
|
//!
|
|
//! \note The availability of SIR (IrDA) operation varies with the Tiva
|
|
//! part in use. Please consult the datasheet for the part you are using to
|
|
//! determine whether this support is available.
|
|
//!
|
|
//! \return None.
|
|
//
|
|
//*****************************************************************************
|
|
void
|
|
UARTDisableSIR(uint32_t ui32Base)
|
|
{
|
|
//
|
|
// Check the arguments.
|
|
//
|
|
ASSERT(_UARTBaseValid(ui32Base));
|
|
|
|
//
|
|
// Disable SIR and SIRLP (if appropriate).
|
|
//
|
|
HWREG(ui32Base + UART_O_CTL) &= ~(UART_CTL_SIREN | UART_CTL_SIRLP);
|
|
}
|
|
|
|
//*****************************************************************************
|
|
//
|
|
//! Enables ISO7816 smart card mode on the specified UART.
|
|
//!
|
|
//! \param ui32Base is the base address of the UART port.
|
|
//!
|
|
//! This function enables the SMART control bit for the ISO7816 smart card mode
|
|
//! on the UART. This call also sets 8-bit word length and even parity as
|
|
//! required by ISO7816.
|
|
//!
|
|
//! \note The availability of ISO7816 smart card mode varies with the Tiva
|
|
//! part and UART in use. Please consult the datasheet for the part you are
|
|
//! using to determine whether this support is available.
|
|
//!
|
|
//! \return None.
|
|
//
|
|
//*****************************************************************************
|
|
void
|
|
UARTSmartCardEnable(uint32_t ui32Base)
|
|
{
|
|
uint32_t ui32Val;
|
|
|
|
//
|
|
// Check the arguments.
|
|
//
|
|
ASSERT(_UARTBaseValid(ui32Base));
|
|
|
|
//
|
|
// Set 8-bit word length, even parity, 2 stop bits (note that although the
|
|
// STP2 bit is ignored when in smartcard mode, this code lets the caller
|
|
// read back the actual setting in use).
|
|
//
|
|
ui32Val = HWREG(ui32Base + UART_O_LCRH);
|
|
ui32Val &= ~(UART_LCRH_SPS | UART_LCRH_EPS | UART_LCRH_PEN |
|
|
UART_LCRH_WLEN_M);
|
|
ui32Val |= UART_LCRH_WLEN_8 | UART_LCRH_PEN | UART_LCRH_EPS |
|
|
UART_LCRH_STP2;
|
|
HWREG(ui32Base + UART_O_LCRH) = ui32Val;
|
|
|
|
//
|
|
// Enable SMART mode.
|
|
//
|
|
HWREG(ui32Base + UART_O_CTL) |= UART_CTL_SMART;
|
|
}
|
|
|
|
//*****************************************************************************
|
|
//
|
|
//! Disables ISO7816 smart card mode on the specified UART.
|
|
//!
|
|
//! \param ui32Base is the base address of the UART port.
|
|
//!
|
|
//! This function clears the SMART (ISO7816 smart card) bit in the UART
|
|
//! control register.
|
|
//!
|
|
//! \note The availability of ISO7816 smart card mode varies with the Tiva
|
|
//! part and UART in use. Please consult the datasheet for the part you are
|
|
//! using to determine whether this support is available.
|
|
//!
|
|
//! \return None.
|
|
//
|
|
//*****************************************************************************
|
|
void
|
|
UARTSmartCardDisable(uint32_t ui32Base)
|
|
{
|
|
//
|
|
// Check the arguments.
|
|
//
|
|
ASSERT(_UARTBaseValid(ui32Base));
|
|
|
|
//
|
|
// Disable the SMART bit.
|
|
//
|
|
HWREG(ui32Base + UART_O_CTL) &= ~UART_CTL_SMART;
|
|
}
|
|
|
|
//*****************************************************************************
|
|
//
|
|
//! Sets the states of the DTR and/or RTS modem control signals.
|
|
//!
|
|
//! \param ui32Base is the base address of the UART port.
|
|
//! \param ui32Control is a bit-mapped flag indicating which modem control bits
|
|
//! should be set.
|
|
//!
|
|
//! This function configures the states of the DTR or RTS modem handshake
|
|
//! outputs from the UART.
|
|
//!
|
|
//! The \e ui32Control parameter is the logical OR of any of the following:
|
|
//!
|
|
//! - \b UART_OUTPUT_DTR - The modem control DTR signal
|
|
//! - \b UART_OUTPUT_RTS - The modem control RTS signal
|
|
//!
|
|
//! \note The availability of hardware modem handshake signals varies with the
|
|
//! Tiva part and UART in use. Please consult the datasheet for the part
|
|
//! you are using to determine whether this support is available.
|
|
//!
|
|
//! \return None.
|
|
//
|
|
//*****************************************************************************
|
|
void
|
|
UARTModemControlSet(uint32_t ui32Base, uint32_t ui32Control)
|
|
{
|
|
uint32_t ui32Temp;
|
|
|
|
//
|
|
// Check the arguments.
|
|
//
|
|
ASSERT(ui32Base == UART1_BASE);
|
|
ASSERT((ui32Control & ~(UART_OUTPUT_RTS | UART_OUTPUT_DTR)) == 0);
|
|
|
|
//
|
|
// Set the appropriate modem control output bits.
|
|
//
|
|
ui32Temp = HWREG(ui32Base + UART_O_CTL);
|
|
ui32Temp |= (ui32Control & (UART_OUTPUT_RTS | UART_OUTPUT_DTR));
|
|
HWREG(ui32Base + UART_O_CTL) = ui32Temp;
|
|
}
|
|
|
|
//*****************************************************************************
|
|
//
|
|
//! Clears the states of the DTR and/or RTS modem control signals.
|
|
//!
|
|
//! \param ui32Base is the base address of the UART port.
|
|
//! \param ui32Control is a bit-mapped flag indicating which modem control bits
|
|
//! should be set.
|
|
//!
|
|
//! This function clears the states of the DTR or RTS modem handshake outputs
|
|
//! from the UART.
|
|
//!
|
|
//! The \e ui32Control parameter is the logical OR of any of the following:
|
|
//!
|
|
//! - \b UART_OUTPUT_DTR - The modem control DTR signal
|
|
//! - \b UART_OUTPUT_RTS - The modem control RTS signal
|
|
//!
|
|
//! \note The availability of hardware modem handshake signals varies with the
|
|
//! Tiva part and UART in use. Please consult the datasheet for the part
|
|
//! you are using to determine whether this support is available.
|
|
//!
|
|
//! \return None.
|
|
//
|
|
//*****************************************************************************
|
|
void
|
|
UARTModemControlClear(uint32_t ui32Base, uint32_t ui32Control)
|
|
{
|
|
uint32_t ui32Temp;
|
|
|
|
//
|
|
// Check the arguments.
|
|
//
|
|
ASSERT(ui32Base == UART1_BASE);
|
|
ASSERT((ui32Control & ~(UART_OUTPUT_RTS | UART_OUTPUT_DTR)) == 0);
|
|
|
|
//
|
|
// Set the appropriate modem control output bits.
|
|
//
|
|
ui32Temp = HWREG(ui32Base + UART_O_CTL);
|
|
ui32Temp &= ~(ui32Control & (UART_OUTPUT_RTS | UART_OUTPUT_DTR));
|
|
HWREG(ui32Base + UART_O_CTL) = ui32Temp;
|
|
}
|
|
|
|
//*****************************************************************************
|
|
//
|
|
//! Gets the states of the DTR and RTS modem control signals.
|
|
//!
|
|
//! \param ui32Base is the base address of the UART port.
|
|
//!
|
|
//! This function returns the current states of each of the two UART modem
|
|
//! control signals, DTR and RTS.
|
|
//!
|
|
//! \note The availability of hardware modem handshake signals varies with the
|
|
//! Tiva part and UART in use. Please consult the datasheet for the part
|
|
//! you are using to determine whether this support is available.
|
|
//!
|
|
//! \return Returns the states of the handshake output signals. This value is
|
|
//! a logical OR combination of values \b UART_OUTPUT_RTS and
|
|
//! \b UART_OUTPUT_DTR where the presence of each flag indicates that the
|
|
//! associated signal is asserted.
|
|
//
|
|
//*****************************************************************************
|
|
uint32_t
|
|
UARTModemControlGet(uint32_t ui32Base)
|
|
{
|
|
//
|
|
// Check the arguments.
|
|
//
|
|
ASSERT(ui32Base == UART1_BASE);
|
|
|
|
return(HWREG(ui32Base + UART_O_CTL) & (UART_OUTPUT_RTS | UART_OUTPUT_DTR));
|
|
}
|
|
|
|
//*****************************************************************************
|
|
//
|
|
//! Gets the states of the RI, DCD, DSR and CTS modem status signals.
|
|
//!
|
|
//! \param ui32Base is the base address of the UART port.
|
|
//!
|
|
//! This function returns the current states of each of the four UART modem
|
|
//! status signals, RI, DCD, DSR and CTS.
|
|
//!
|
|
//! \note The availability of hardware modem handshake signals varies with the
|
|
//! Tiva part and UART in use. Please consult the datasheet for the part
|
|
//! you are using to determine whether this support is available.
|
|
//!
|
|
//! \return Returns the states of the handshake output signals. This value
|
|
//! is a logical OR combination of values \b UART_INPUT_RI,
|
|
//! \b UART_INPUT_DCD, \b UART_INPUT_CTS and \b UART_INPUT_DSR where the
|
|
//! presence of each flag indicates that the associated signal is asserted.
|
|
//
|
|
//*****************************************************************************
|
|
uint32_t
|
|
UARTModemStatusGet(uint32_t ui32Base)
|
|
{
|
|
//
|
|
// Check the arguments.
|
|
//
|
|
ASSERT(ui32Base == UART1_BASE);
|
|
|
|
return(HWREG(ui32Base + UART_O_FR) & (UART_INPUT_RI | UART_INPUT_DCD |
|
|
UART_INPUT_CTS | UART_INPUT_DSR));
|
|
}
|
|
|
|
//*****************************************************************************
|
|
//
|
|
//! Sets the UART hardware flow control mode to be used.
|
|
//!
|
|
//! \param ui32Base is the base address of the UART port.
|
|
//! \param ui32Mode indicates the flow control modes to be used. This
|
|
//! parameter is a logical OR combination of values \b UART_FLOWCONTROL_TX and
|
|
//! \b UART_FLOWCONTROL_RX to enable hardware transmit (CTS) and receive (RTS)
|
|
//! flow control or \b UART_FLOWCONTROL_NONE to disable hardware flow control.
|
|
//!
|
|
//! This function configures the required hardware flow control modes. If
|
|
//! \e ui32Mode contains flag \b UART_FLOWCONTROL_TX, data is only transmitted
|
|
//! if the incoming CTS signal is asserted. If \e ui32Mode contains flag
|
|
//! \b UART_FLOWCONTROL_RX, the RTS output is controlled by the hardware and is
|
|
//! asserted only when there is space available in the receive FIFO. If no
|
|
//! hardware flow control is required, \b UART_FLOWCONTROL_NONE should be
|
|
//! passed.
|
|
//!
|
|
//! \note The availability of hardware flow control varies with the Tiva
|
|
//! part and UART in use. Please consult the datasheet for the part you are
|
|
//! using to determine whether this support is available.
|
|
//!
|
|
//! \return None.
|
|
//
|
|
//*****************************************************************************
|
|
void
|
|
UARTFlowControlSet(uint32_t ui32Base, uint32_t ui32Mode)
|
|
{
|
|
//
|
|
// Check the arguments.
|
|
//
|
|
ASSERT(_UARTBaseValid(ui32Base));
|
|
ASSERT((ui32Mode & ~(UART_FLOWCONTROL_TX | UART_FLOWCONTROL_RX)) == 0);
|
|
|
|
//
|
|
// Set the flow control mode as requested.
|
|
//
|
|
HWREG(ui32Base + UART_O_CTL) = ((HWREG(ui32Base + UART_O_CTL) &
|
|
~(UART_FLOWCONTROL_TX |
|
|
UART_FLOWCONTROL_RX)) | ui32Mode);
|
|
}
|
|
|
|
//*****************************************************************************
|
|
//
|
|
//! Returns the UART hardware flow control mode currently in use.
|
|
//!
|
|
//! \param ui32Base is the base address of the UART port.
|
|
//!
|
|
//! This function returns the current hardware flow control mode.
|
|
//!
|
|
//! \note The availability of hardware flow control varies with the Tiva
|
|
//! part and UART in use. Please consult the datasheet for the part you are
|
|
//! using to determine whether this support is available.
|
|
//!
|
|
//! \return Returns the current flow control mode in use. This value is a
|
|
//! logical OR combination of values \b UART_FLOWCONTROL_TX if transmit
|
|
//! (CTS) flow control is enabled and \b UART_FLOWCONTROL_RX if receive (RTS)
|
|
//! flow control is in use. If hardware flow control is disabled,
|
|
//! \b UART_FLOWCONTROL_NONE is returned.
|
|
//
|
|
//*****************************************************************************
|
|
uint32_t
|
|
UARTFlowControlGet(uint32_t ui32Base)
|
|
{
|
|
//
|
|
// Check the arguments.
|
|
//
|
|
ASSERT(_UARTBaseValid(ui32Base));
|
|
|
|
return(HWREG(ui32Base + UART_O_CTL) & (UART_FLOWCONTROL_TX |
|
|
UART_FLOWCONTROL_RX));
|
|
}
|
|
|
|
//*****************************************************************************
|
|
//
|
|
//! Sets the operating mode for the UART transmit interrupt.
|
|
//!
|
|
//! \param ui32Base is the base address of the UART port.
|
|
//! \param ui32Mode is the operating mode for the transmit interrupt. It may
|
|
//! be \b UART_TXINT_MODE_EOT to trigger interrupts when the transmitter is
|
|
//! idle or \b UART_TXINT_MODE_FIFO to trigger based on the current transmit
|
|
//! FIFO level.
|
|
//!
|
|
//! This function allows the mode of the UART transmit interrupt to be set. By
|
|
//! default, the transmit interrupt is asserted when the FIFO level falls past
|
|
//! a threshold set via a call to UARTFIFOLevelSet(). Alternatively, if this
|
|
//! function is called with \e ui32Mode set to \b UART_TXINT_MODE_EOT, the
|
|
//! transmit interrupt is asserted once the transmitter is completely idle -
|
|
//! the transmit FIFO is empty and all bits, including any stop bits, have
|
|
//! cleared the transmitter.
|
|
//!
|
|
//! \note The availability of end-of-transmission mode varies with the
|
|
//! Tiva part in use. Please consult the datasheet for the part you are
|
|
//! using to determine whether this support is available.
|
|
//!
|
|
//! \return None.
|
|
//
|
|
//*****************************************************************************
|
|
void
|
|
UARTTxIntModeSet(uint32_t ui32Base, uint32_t ui32Mode)
|
|
{
|
|
//
|
|
// Check the arguments.
|
|
//
|
|
ASSERT(_UARTBaseValid(ui32Base));
|
|
ASSERT((ui32Mode == UART_TXINT_MODE_EOT) ||
|
|
(ui32Mode == UART_TXINT_MODE_FIFO));
|
|
|
|
//
|
|
// Set or clear the EOT bit of the UART control register as appropriate.
|
|
//
|
|
HWREG(ui32Base + UART_O_CTL) = ((HWREG(ui32Base + UART_O_CTL) &
|
|
~(UART_TXINT_MODE_EOT |
|
|
UART_TXINT_MODE_FIFO)) | ui32Mode);
|
|
}
|
|
|
|
//*****************************************************************************
|
|
//
|
|
//! Returns the current operating mode for the UART transmit interrupt.
|
|
//!
|
|
//! \param ui32Base is the base address of the UART port.
|
|
//!
|
|
//! This function returns the current operating mode for the UART transmit
|
|
//! interrupt. The return value is \b UART_TXINT_MODE_EOT if the transmit
|
|
//! interrupt is currently configured to be asserted once the transmitter is
|
|
//! completely idle - the transmit FIFO is empty and all bits, including any
|
|
//! stop bits, have cleared the transmitter. The return value is
|
|
//! \b UART_TXINT_MODE_FIFO if the interrupt is configured to be asserted based
|
|
//! on the level of the transmit FIFO.
|
|
//!
|
|
//! \note The availability of end-of-transmission mode varies with the
|
|
//! Tiva part in use. Please consult the datasheet for the part you are
|
|
//! using to determine whether this support is available.
|
|
//!
|
|
//! \return Returns \b UART_TXINT_MODE_FIFO or \b UART_TXINT_MODE_EOT.
|
|
//
|
|
//*****************************************************************************
|
|
uint32_t
|
|
UARTTxIntModeGet(uint32_t ui32Base)
|
|
{
|
|
//
|
|
// Check the arguments.
|
|
//
|
|
ASSERT(_UARTBaseValid(ui32Base));
|
|
|
|
//
|
|
// Return the current transmit interrupt mode.
|
|
//
|
|
return(HWREG(ui32Base + UART_O_CTL) & (UART_TXINT_MODE_EOT |
|
|
UART_TXINT_MODE_FIFO));
|
|
}
|
|
|
|
//*****************************************************************************
|
|
//
|
|
//! Determines if there are any characters in the receive FIFO.
|
|
//!
|
|
//! \param ui32Base is the base address of the UART port.
|
|
//!
|
|
//! This function returns a flag indicating whether or not there is data
|
|
//! available in the receive FIFO.
|
|
//!
|
|
//! \return Returns \b true if there is data in the receive FIFO or \b false
|
|
//! if there is no data in the receive FIFO.
|
|
//
|
|
//*****************************************************************************
|
|
bool
|
|
UARTCharsAvail(uint32_t ui32Base)
|
|
{
|
|
//
|
|
// Check the arguments.
|
|
//
|
|
ASSERT(_UARTBaseValid(ui32Base));
|
|
|
|
//
|
|
// Return the availability of characters.
|
|
//
|
|
return((HWREG(ui32Base + UART_O_FR) & UART_FR_RXFE) ? false : true);
|
|
}
|
|
|
|
//*****************************************************************************
|
|
//
|
|
//! Determines if there is any space in the transmit FIFO.
|
|
//!
|
|
//! \param ui32Base is the base address of the UART port.
|
|
//!
|
|
//! This function returns a flag indicating whether or not there is space
|
|
//! available in the transmit FIFO.
|
|
//!
|
|
//! \return Returns \b true if there is space available in the transmit FIFO
|
|
//! or \b false if there is no space available in the transmit FIFO.
|
|
//
|
|
//*****************************************************************************
|
|
bool
|
|
UARTSpaceAvail(uint32_t ui32Base)
|
|
{
|
|
//
|
|
// Check the arguments.
|
|
//
|
|
ASSERT(_UARTBaseValid(ui32Base));
|
|
|
|
//
|
|
// Return the availability of space.
|
|
//
|
|
return((HWREG(ui32Base + UART_O_FR) & UART_FR_TXFF) ? false : true);
|
|
}
|
|
|
|
//*****************************************************************************
|
|
//
|
|
//! Receives a character from the specified port.
|
|
//!
|
|
//! \param ui32Base is the base address of the UART port.
|
|
//!
|
|
//! This function gets a character from the receive FIFO for the specified
|
|
//! port.
|
|
//!
|
|
//! \return Returns the character read from the specified port, cast as a
|
|
//! \e int32_t. A \b -1 is returned if there are no characters present in the
|
|
//! receive FIFO. The UARTCharsAvail() function should be called before
|
|
//! attempting to call this function.
|
|
//
|
|
//*****************************************************************************
|
|
int32_t
|
|
UARTCharGetNonBlocking(uint32_t ui32Base)
|
|
{
|
|
//
|
|
// Check the arguments.
|
|
//
|
|
ASSERT(_UARTBaseValid(ui32Base));
|
|
|
|
//
|
|
// See if there are any characters in the receive FIFO.
|
|
//
|
|
if(!(HWREG(ui32Base + UART_O_FR) & UART_FR_RXFE))
|
|
{
|
|
//
|
|
// Read and return the next character.
|
|
//
|
|
return(HWREG(ui32Base + UART_O_DR));
|
|
}
|
|
else
|
|
{
|
|
//
|
|
// There are no characters, so return a failure.
|
|
//
|
|
return(-1);
|
|
}
|
|
}
|
|
|
|
//*****************************************************************************
|
|
//
|
|
//! Waits for a character from the specified port.
|
|
//!
|
|
//! \param ui32Base is the base address of the UART port.
|
|
//!
|
|
//! This function gets a character from the receive FIFO for the specified
|
|
//! port. If there are no characters available, this function waits until a
|
|
//! character is received before returning.
|
|
//!
|
|
//! \return Returns the character read from the specified port, cast as a
|
|
//! \e int32_t.
|
|
//
|
|
//*****************************************************************************
|
|
int32_t
|
|
UARTCharGet(uint32_t ui32Base)
|
|
{
|
|
//
|
|
// Check the arguments.
|
|
//
|
|
ASSERT(_UARTBaseValid(ui32Base));
|
|
|
|
//
|
|
// Wait until a char is available.
|
|
//
|
|
while(HWREG(ui32Base + UART_O_FR) & UART_FR_RXFE)
|
|
{
|
|
}
|
|
|
|
//
|
|
// Now get the char.
|
|
//
|
|
return(HWREG(ui32Base + UART_O_DR));
|
|
}
|
|
|
|
//*****************************************************************************
|
|
//
|
|
//! Sends a character to the specified port.
|
|
//!
|
|
//! \param ui32Base is the base address of the UART port.
|
|
//! \param ucData is the character to be transmitted.
|
|
//!
|
|
//! This function writes the character \e ucData to the transmit FIFO for the
|
|
//! specified port. This function does not block, so if there is no space
|
|
//! available, then a \b false is returned and the application must retry the
|
|
//! function later.
|
|
//!
|
|
//! \return Returns \b true if the character was successfully placed in the
|
|
//! transmit FIFO or \b false if there was no space available in the transmit
|
|
//! FIFO.
|
|
//
|
|
//*****************************************************************************
|
|
bool
|
|
UARTCharPutNonBlocking(uint32_t ui32Base, unsigned char ucData)
|
|
{
|
|
//
|
|
// Check the arguments.
|
|
//
|
|
ASSERT(_UARTBaseValid(ui32Base));
|
|
|
|
//
|
|
// See if there is space in the transmit FIFO.
|
|
//
|
|
if(!(HWREG(ui32Base + UART_O_FR) & UART_FR_TXFF))
|
|
{
|
|
//
|
|
// Write this character to the transmit FIFO.
|
|
//
|
|
HWREG(ui32Base + UART_O_DR) = ucData;
|
|
|
|
//
|
|
// Success.
|
|
//
|
|
return(true);
|
|
}
|
|
else
|
|
{
|
|
//
|
|
// There is no space in the transmit FIFO, so return a failure.
|
|
//
|
|
return(false);
|
|
}
|
|
}
|
|
|
|
//*****************************************************************************
|
|
//
|
|
//! Waits to send a character from the specified port.
|
|
//!
|
|
//! \param ui32Base is the base address of the UART port.
|
|
//! \param ucData is the character to be transmitted.
|
|
//!
|
|
//! This function sends the character \e ucData to the transmit FIFO for the
|
|
//! specified port. If there is no space available in the transmit FIFO, this
|
|
//! function waits until there is space available before returning.
|
|
//!
|
|
//! \return None.
|
|
//
|
|
//*****************************************************************************
|
|
void
|
|
UARTCharPut(uint32_t ui32Base, unsigned char ucData)
|
|
{
|
|
//
|
|
// Check the arguments.
|
|
//
|
|
ASSERT(_UARTBaseValid(ui32Base));
|
|
|
|
//
|
|
// Wait until space is available.
|
|
//
|
|
while(HWREG(ui32Base + UART_O_FR) & UART_FR_TXFF)
|
|
{
|
|
}
|
|
|
|
//
|
|
// Send the char.
|
|
//
|
|
HWREG(ui32Base + UART_O_DR) = ucData;
|
|
}
|
|
|
|
//*****************************************************************************
|
|
//
|
|
//! Causes a BREAK to be sent.
|
|
//!
|
|
//! \param ui32Base is the base address of the UART port.
|
|
//! \param bBreakState controls the output level.
|
|
//!
|
|
//! Calling this function with \e bBreakState set to \b true asserts a break
|
|
//! condition on the UART. Calling this function with \e bBreakState set to
|
|
//! \b false removes the break condition. For proper transmission of a break
|
|
//! command, the break must be asserted for at least two complete frames.
|
|
//!
|
|
//! \return None.
|
|
//
|
|
//*****************************************************************************
|
|
void
|
|
UARTBreakCtl(uint32_t ui32Base, bool bBreakState)
|
|
{
|
|
//
|
|
// Check the arguments.
|
|
//
|
|
ASSERT(_UARTBaseValid(ui32Base));
|
|
|
|
//
|
|
// Set the break condition as requested.
|
|
//
|
|
HWREG(ui32Base + UART_O_LCRH) =
|
|
(bBreakState ?
|
|
(HWREG(ui32Base + UART_O_LCRH) | UART_LCRH_BRK) :
|
|
(HWREG(ui32Base + UART_O_LCRH) & ~(UART_LCRH_BRK)));
|
|
}
|
|
|
|
//*****************************************************************************
|
|
//
|
|
//! Determines whether the UART transmitter is busy or not.
|
|
//!
|
|
//! \param ui32Base is the base address of the UART port.
|
|
//!
|
|
//! This function allows the caller to determine whether all transmitted bytes
|
|
//! have cleared the transmitter hardware. If \b false is returned, the
|
|
//! transmit FIFO is empty and all bits of the last transmitted character,
|
|
//! including all stop bits, have left the hardware shift register.
|
|
//!
|
|
//! \return Returns \b true if the UART is transmitting or \b false if all
|
|
//! transmissions are complete.
|
|
//
|
|
//*****************************************************************************
|
|
bool
|
|
UARTBusy(uint32_t ui32Base)
|
|
{
|
|
//
|
|
// Check the argument.
|
|
//
|
|
ASSERT(_UARTBaseValid(ui32Base));
|
|
|
|
//
|
|
// Determine if the UART is busy.
|
|
//
|
|
return((HWREG(ui32Base + UART_O_FR) & UART_FR_BUSY) ? true : false);
|
|
}
|
|
|
|
//*****************************************************************************
|
|
//
|
|
//! Registers an interrupt handler for a UART interrupt.
|
|
//!
|
|
//! \param ui32Base is the base address of the UART port.
|
|
//! \param pfnHandler is a pointer to the function to be called when the
|
|
//! UART interrupt occurs.
|
|
//!
|
|
//! This function does the actual registering of the interrupt handler. This
|
|
//! function enables the global interrupt in the interrupt controller; specific
|
|
//! UART interrupts must be enabled via UARTIntEnable(). It is the interrupt
|
|
//! handler's responsibility to clear the interrupt source.
|
|
//!
|
|
//! \sa IntRegister() for important information about registering interrupt
|
|
//! handlers.
|
|
//!
|
|
//! \return None.
|
|
//
|
|
//*****************************************************************************
|
|
void
|
|
UARTIntRegister(uint32_t ui32Base, void (*pfnHandler)(void))
|
|
{
|
|
uint32_t ui32Int;
|
|
|
|
//
|
|
// Check the arguments.
|
|
//
|
|
ASSERT(_UARTBaseValid(ui32Base));
|
|
|
|
//
|
|
// Determine the interrupt number based on the UART port.
|
|
//
|
|
ui32Int = _UARTIntNumberGet(ui32Base);
|
|
|
|
ASSERT(ui32Int != 0);
|
|
|
|
//
|
|
// Register the interrupt handler.
|
|
//
|
|
IntRegister(ui32Int, pfnHandler);
|
|
|
|
//
|
|
// Enable the UART interrupt.
|
|
//
|
|
IntEnable(ui32Int);
|
|
}
|
|
|
|
//*****************************************************************************
|
|
//
|
|
//! Unregisters an interrupt handler for a UART interrupt.
|
|
//!
|
|
//! \param ui32Base is the base address of the UART port.
|
|
//!
|
|
//! This function does the actual unregistering of the interrupt handler. It
|
|
//! clears the handler to be called when a UART interrupt occurs. This
|
|
//! function also masks off the interrupt in the interrupt controller so that
|
|
//! the interrupt handler no longer is called.
|
|
//!
|
|
//! \sa IntRegister() for important information about registering interrupt
|
|
//! handlers.
|
|
//!
|
|
//! \return None.
|
|
//
|
|
//*****************************************************************************
|
|
void
|
|
UARTIntUnregister(uint32_t ui32Base)
|
|
{
|
|
uint32_t ui32Int;
|
|
|
|
//
|
|
// Check the arguments.
|
|
//
|
|
ASSERT(_UARTBaseValid(ui32Base));
|
|
|
|
//
|
|
// Determine the interrupt number based on the UART port.
|
|
//
|
|
ui32Int = _UARTIntNumberGet(ui32Base);
|
|
|
|
ASSERT(ui32Int != 0);
|
|
|
|
//
|
|
// Disable the interrupt.
|
|
//
|
|
IntDisable(ui32Int);
|
|
|
|
//
|
|
// Unregister the interrupt handler.
|
|
//
|
|
IntUnregister(ui32Int);
|
|
}
|
|
|
|
//*****************************************************************************
|
|
//
|
|
//! Enables individual UART interrupt sources.
|
|
//!
|
|
//! \param ui32Base is the base address of the UART port.
|
|
//! \param ui32IntFlags is the bit mask of the interrupt sources to be enabled.
|
|
//!
|
|
//! This function enables the indicated UART interrupt sources. Only the
|
|
//! sources that are enabled can be reflected to the processor interrupt;
|
|
//! disabled sources have no effect on the processor.
|
|
//!
|
|
//! The \e ui32IntFlags parameter is the logical OR of any of the following:
|
|
//!
|
|
//! - \b UART_INT_9BIT - 9-bit Address Match interrupt
|
|
//! - \b UART_INT_OE - Overrun Error interrupt
|
|
//! - \b UART_INT_BE - Break Error interrupt
|
|
//! - \b UART_INT_PE - Parity Error interrupt
|
|
//! - \b UART_INT_FE - Framing Error interrupt
|
|
//! - \b UART_INT_RT - Receive Timeout interrupt
|
|
//! - \b UART_INT_TX - Transmit interrupt
|
|
//! - \b UART_INT_RX - Receive interrupt
|
|
//! - \b UART_INT_DSR - DSR interrupt
|
|
//! - \b UART_INT_DCD - DCD interrupt
|
|
//! - \b UART_INT_CTS - CTS interrupt
|
|
//! - \b UART_INT_RI - RI interrupt
|
|
//!
|
|
//! \return None.
|
|
//
|
|
//*****************************************************************************
|
|
void
|
|
UARTIntEnable(uint32_t ui32Base, uint32_t ui32IntFlags)
|
|
{
|
|
//
|
|
// Check the arguments.
|
|
//
|
|
ASSERT(_UARTBaseValid(ui32Base));
|
|
|
|
//
|
|
// Enable the specified interrupts.
|
|
//
|
|
HWREG(ui32Base + UART_O_IM) |= ui32IntFlags;
|
|
}
|
|
|
|
//*****************************************************************************
|
|
//
|
|
//! Disables individual UART interrupt sources.
|
|
//!
|
|
//! \param ui32Base is the base address of the UART port.
|
|
//! \param ui32IntFlags is the bit mask of the interrupt sources to be
|
|
//! disabled.
|
|
//!
|
|
//! This function disables the indicated UART interrupt sources. Only the
|
|
//! sources that are enabled can be reflected to the processor interrupt;
|
|
//! disabled sources have no effect on the processor.
|
|
//!
|
|
//! The \e ui32IntFlags parameter has the same definition as the
|
|
//! \e ui32IntFlags parameter to UARTIntEnable().
|
|
//!
|
|
//! \return None.
|
|
//
|
|
//*****************************************************************************
|
|
void
|
|
UARTIntDisable(uint32_t ui32Base, uint32_t ui32IntFlags)
|
|
{
|
|
//
|
|
// Check the arguments.
|
|
//
|
|
ASSERT(_UARTBaseValid(ui32Base));
|
|
|
|
//
|
|
// Disable the specified interrupts.
|
|
//
|
|
HWREG(ui32Base + UART_O_IM) &= ~(ui32IntFlags);
|
|
}
|
|
|
|
//*****************************************************************************
|
|
//
|
|
//! Gets the current interrupt status.
|
|
//!
|
|
//! \param ui32Base is the base address of the UART port.
|
|
//! \param bMasked is \b false if the raw interrupt status is required and
|
|
//! \b true if the masked interrupt status is required.
|
|
//!
|
|
//! This function returns the interrupt status for the specified UART. Either
|
|
//! the raw interrupt status or the status of interrupts that are allowed to
|
|
//! reflect to the processor can be returned.
|
|
//!
|
|
//! \return Returns the current interrupt status, enumerated as a bit field of
|
|
//! values described in UARTIntEnable().
|
|
//
|
|
//*****************************************************************************
|
|
uint32_t
|
|
UARTIntStatus(uint32_t ui32Base, bool bMasked)
|
|
{
|
|
//
|
|
// Check the arguments.
|
|
//
|
|
ASSERT(_UARTBaseValid(ui32Base));
|
|
|
|
//
|
|
// Return either the interrupt status or the raw interrupt status as
|
|
// requested.
|
|
//
|
|
if(bMasked)
|
|
{
|
|
return(HWREG(ui32Base + UART_O_MIS));
|
|
}
|
|
else
|
|
{
|
|
return(HWREG(ui32Base + UART_O_RIS));
|
|
}
|
|
}
|
|
|
|
//*****************************************************************************
|
|
//
|
|
//! Clears UART interrupt sources.
|
|
//!
|
|
//! \param ui32Base is the base address of the UART port.
|
|
//! \param ui32IntFlags is a bit mask of the interrupt sources to be cleared.
|
|
//!
|
|
//! The specified UART interrupt sources are cleared, so that they no longer
|
|
//! assert. This function must be called in the interrupt handler to keep the
|
|
//! interrupt from being triggered again immediately upon exit.
|
|
//!
|
|
//! The \e ui32IntFlags parameter has the same definition as the
|
|
//! \e ui32IntFlags parameter to UARTIntEnable().
|
|
//!
|
|
//! \note Because there is a write buffer in the Cortex-M processor, it may
|
|
//! take several clock cycles before the interrupt source is actually cleared.
|
|
//! Therefore, it is recommended that the interrupt source be cleared early in
|
|
//! the interrupt handler (as opposed to the very last action) to avoid
|
|
//! returning from the interrupt handler before the interrupt source is
|
|
//! actually cleared. Failure to do so may result in the interrupt handler
|
|
//! being immediately reentered (because the interrupt controller still sees
|
|
//! the interrupt source asserted).
|
|
//!
|
|
//! \return None.
|
|
//
|
|
//*****************************************************************************
|
|
void
|
|
UARTIntClear(uint32_t ui32Base, uint32_t ui32IntFlags)
|
|
{
|
|
//
|
|
// Check the arguments.
|
|
//
|
|
ASSERT(_UARTBaseValid(ui32Base));
|
|
|
|
//
|
|
// Clear the requested interrupt sources.
|
|
//
|
|
HWREG(ui32Base + UART_O_ICR) = ui32IntFlags;
|
|
}
|
|
|
|
//*****************************************************************************
|
|
//
|
|
//! Enable UART uDMA operation.
|
|
//!
|
|
//! \param ui32Base is the base address of the UART port.
|
|
//! \param ui32DMAFlags is a bit mask of the uDMA features to enable.
|
|
//!
|
|
//! The specified UART uDMA features are enabled. The UART can be
|
|
//! configured to use uDMA for transmit or receive and to disable
|
|
//! receive if an error occurs. The \e ui32DMAFlags parameter is the
|
|
//! logical OR of any of the following values:
|
|
//!
|
|
//! - \b UART_DMA_RX - enable uDMA for receive
|
|
//! - \b UART_DMA_TX - enable uDMA for transmit
|
|
//! - \b UART_DMA_ERR_RXSTOP - disable uDMA receive on UART error
|
|
//!
|
|
//! \note The uDMA controller must also be set up before DMA can be used
|
|
//! with the UART.
|
|
//!
|
|
//! \return None.
|
|
//
|
|
//*****************************************************************************
|
|
void
|
|
UARTDMAEnable(uint32_t ui32Base, uint32_t ui32DMAFlags)
|
|
{
|
|
//
|
|
// Check the arguments.
|
|
//
|
|
ASSERT(_UARTBaseValid(ui32Base));
|
|
|
|
//
|
|
// Set the requested bits in the UART uDMA control register.
|
|
//
|
|
HWREG(ui32Base + UART_O_DMACTL) |= ui32DMAFlags;
|
|
}
|
|
|
|
//*****************************************************************************
|
|
//
|
|
//! Disable UART uDMA operation.
|
|
//!
|
|
//! \param ui32Base is the base address of the UART port.
|
|
//! \param ui32DMAFlags is a bit mask of the uDMA features to disable.
|
|
//!
|
|
//! This function is used to disable UART uDMA features that were enabled
|
|
//! by UARTDMAEnable(). The specified UART uDMA features are disabled. The
|
|
//! \e ui32DMAFlags parameter is the logical OR of any of the following values:
|
|
//!
|
|
//! - \b UART_DMA_RX - disable uDMA for receive
|
|
//! - \b UART_DMA_TX - disable uDMA for transmit
|
|
//! - \b UART_DMA_ERR_RXSTOP - do not disable uDMA receive on UART error
|
|
//!
|
|
//! \return None.
|
|
//
|
|
//*****************************************************************************
|
|
void
|
|
UARTDMADisable(uint32_t ui32Base, uint32_t ui32DMAFlags)
|
|
{
|
|
//
|
|
// Check the arguments.
|
|
//
|
|
ASSERT(_UARTBaseValid(ui32Base));
|
|
|
|
//
|
|
// Clear the requested bits in the UART uDMA control register.
|
|
//
|
|
HWREG(ui32Base + UART_O_DMACTL) &= ~ui32DMAFlags;
|
|
}
|
|
|
|
//*****************************************************************************
|
|
//
|
|
//! Gets current receiver errors.
|
|
//!
|
|
//! \param ui32Base is the base address of the UART port.
|
|
//!
|
|
//! This function returns the current state of each of the 4 receiver error
|
|
//! sources. The returned errors are equivalent to the four error bits
|
|
//! returned via the previous call to UARTCharGet() or UARTCharGetNonBlocking()
|
|
//! with the exception that the overrun error is set immediately when the
|
|
//! overrun occurs rather than when a character is next read.
|
|
//!
|
|
//! \return Returns a logical OR combination of the receiver error flags,
|
|
//! \b UART_RXERROR_FRAMING, \b UART_RXERROR_PARITY, \b UART_RXERROR_BREAK
|
|
//! and \b UART_RXERROR_OVERRUN.
|
|
//
|
|
//*****************************************************************************
|
|
uint32_t
|
|
UARTRxErrorGet(uint32_t ui32Base)
|
|
{
|
|
//
|
|
// Check the arguments.
|
|
//
|
|
ASSERT(_UARTBaseValid(ui32Base));
|
|
|
|
//
|
|
// Return the current value of the receive status register.
|
|
//
|
|
return(HWREG(ui32Base + UART_O_RSR) & 0x0000000F);
|
|
}
|
|
|
|
//*****************************************************************************
|
|
//
|
|
//! Clears all reported receiver errors.
|
|
//!
|
|
//! \param ui32Base is the base address of the UART port.
|
|
//!
|
|
//! This function is used to clear all receiver error conditions reported via
|
|
//! UARTRxErrorGet(). If using the overrun, framing error, parity error or
|
|
//! break interrupts, this function must be called after clearing the interrupt
|
|
//! to ensure that later errors of the same type trigger another interrupt.
|
|
//!
|
|
//! \return None.
|
|
//
|
|
//*****************************************************************************
|
|
void
|
|
UARTRxErrorClear(uint32_t ui32Base)
|
|
{
|
|
//
|
|
// Check the arguments.
|
|
//
|
|
ASSERT(_UARTBaseValid(ui32Base));
|
|
|
|
//
|
|
// Any write to the Error Clear Register clears all bits which are
|
|
// currently set.
|
|
//
|
|
HWREG(ui32Base + UART_O_ECR) = 0;
|
|
}
|
|
|
|
//*****************************************************************************
|
|
//
|
|
//! Sets the baud clock source for the specified UART.
|
|
//!
|
|
//! \param ui32Base is the base address of the UART port.
|
|
//! \param ui32Source is the baud clock source for the UART.
|
|
//!
|
|
//! This function allows the baud clock source for the UART to be selected.
|
|
//! The possible clock source are the system clock (\b UART_CLOCK_SYSTEM) or
|
|
//! the precision internal oscillator (\b UART_CLOCK_PIOSC).
|
|
//!
|
|
//! Changing the baud clock source changes the baud rate generated by the
|
|
//! UART. Therefore, the baud rate should be reconfigured after any change to
|
|
//! the baud clock source.
|
|
//!
|
|
//! \note The ability to specify the UART baud clock source varies with the
|
|
//! Tiva part in use. Please consult the datasheet for the part you are
|
|
//! using to determine whether this support is available.
|
|
//!
|
|
//! \return None.
|
|
//
|
|
//*****************************************************************************
|
|
void
|
|
UARTClockSourceSet(uint32_t ui32Base, uint32_t ui32Source)
|
|
{
|
|
//
|
|
// Check the arguments.
|
|
//
|
|
ASSERT(_UARTBaseValid(ui32Base));
|
|
ASSERT((ui32Source == UART_CLOCK_SYSTEM) ||
|
|
(ui32Source == UART_CLOCK_PIOSC));
|
|
|
|
//
|
|
// Set the UART clock source.
|
|
//
|
|
HWREG(ui32Base + UART_O_CC) = ui32Source;
|
|
}
|
|
|
|
//*****************************************************************************
|
|
//
|
|
//! Gets the baud clock source for the specified UART.
|
|
//!
|
|
//! \param ui32Base is the base address of the UART port.
|
|
//!
|
|
//! This function returns the baud clock source for the specified UART. The
|
|
//! possible baud clock source are the system clock (\b UART_CLOCK_SYSTEM) or
|
|
//! the precision internal oscillator (\b UART_CLOCK_PIOSC).
|
|
//!
|
|
//! \note The ability to specify the UART baud clock source varies with the
|
|
//! Tiva part in use. Please consult the datasheet for the part you are
|
|
//! using to determine whether this support is available.
|
|
//!
|
|
//! \return None.
|
|
//
|
|
//*****************************************************************************
|
|
uint32_t
|
|
UARTClockSourceGet(uint32_t ui32Base)
|
|
{
|
|
//
|
|
// Check the arguments.
|
|
//
|
|
ASSERT(_UARTBaseValid(ui32Base));
|
|
|
|
//
|
|
// Return the UART clock source.
|
|
//
|
|
return(HWREG(ui32Base + UART_O_CC));
|
|
}
|
|
|
|
//*****************************************************************************
|
|
//
|
|
//! Enables 9-bit mode on the specified UART.
|
|
//!
|
|
//! \param ui32Base is the base address of the UART port.
|
|
//!
|
|
//! This function enables the 9-bit operational mode of the UART.
|
|
//!
|
|
//! \note The availability of 9-bit mode varies with the Tiva part in use.
|
|
//! Please consult the datasheet for the part you are using to determine
|
|
//! whether this support is available.
|
|
//!
|
|
//! \return None.
|
|
//
|
|
//*****************************************************************************
|
|
void
|
|
UART9BitEnable(uint32_t ui32Base)
|
|
{
|
|
//
|
|
// Check the arguments.
|
|
//
|
|
ASSERT(_UARTBaseValid(ui32Base));
|
|
|
|
//
|
|
// Enable 9-bit mode.
|
|
//
|
|
HWREG(ui32Base + UART_O_9BITADDR) |= UART_9BITADDR_9BITEN;
|
|
}
|
|
|
|
//*****************************************************************************
|
|
//
|
|
//! Disables 9-bit mode on the specified UART.
|
|
//!
|
|
//! \param ui32Base is the base address of the UART port.
|
|
//!
|
|
//! This function disables the 9-bit operational mode of the UART.
|
|
//!
|
|
//! \note The availability of 9-bit mode varies with the Tiva part in use.
|
|
//! Please consult the datasheet for the part you are using to determine
|
|
//! whether this support is available.
|
|
//!
|
|
//! \return None.
|
|
//
|
|
//*****************************************************************************
|
|
void
|
|
UART9BitDisable(uint32_t ui32Base)
|
|
{
|
|
//
|
|
// Check the arguments.
|
|
//
|
|
ASSERT(_UARTBaseValid(ui32Base));
|
|
|
|
//
|
|
// Disable 9-bit mode.
|
|
//
|
|
HWREG(ui32Base + UART_O_9BITADDR) &= ~UART_9BITADDR_9BITEN;
|
|
}
|
|
|
|
//*****************************************************************************
|
|
//
|
|
//! Sets the device address(es) for 9-bit mode.
|
|
//!
|
|
//! \param ui32Base is the base address of the UART port.
|
|
//! \param ui8Addr is the device address.
|
|
//! \param ui8Mask is the device address mask.
|
|
//!
|
|
//! This function configures the device address or range of device addresses
|
|
//! that respond to requests on the 9-bit UART port. The received address is
|
|
//! masked with the mask and then compared against the given address, allowing
|
|
//! either a single address (if \b ui8Mask is 0xff) or a set of addresses to be
|
|
//! matched.
|
|
//!
|
|
//! \note The availability of 9-bit mode varies with the Tiva part in use.
|
|
//! Please consult the datasheet for the part you are using to determine
|
|
//! whether this support is available.
|
|
//!
|
|
//! \return None.
|
|
//
|
|
//*****************************************************************************
|
|
void
|
|
UART9BitAddrSet(uint32_t ui32Base, uint8_t ui8Addr,
|
|
uint8_t ui8Mask)
|
|
{
|
|
//
|
|
// Check the arguments.
|
|
//
|
|
ASSERT(_UARTBaseValid(ui32Base));
|
|
|
|
//
|
|
// Set the address and mask.
|
|
//
|
|
HWREG(ui32Base + UART_O_9BITADDR) = ui8Addr << UART_9BITADDR_ADDR_S;
|
|
HWREG(ui32Base + UART_O_9BITAMASK) = ui8Mask << UART_9BITAMASK_MASK_S;
|
|
}
|
|
|
|
//*****************************************************************************
|
|
//
|
|
//! Sends an address character from the specified port when operating in 9-bit
|
|
//! mode.
|
|
//!
|
|
//! \param ui32Base is the base address of the UART port.
|
|
//! \param ui8Addr is the address to be transmitted.
|
|
//!
|
|
//! This function waits until all data has been sent from the specified port
|
|
//! and then sends the given address as an address byte. It then waits until
|
|
//! the address byte has been transmitted before returning.
|
|
//!
|
|
//! The normal data functions (UARTCharPut(), UARTCharPutNonBlocking(),
|
|
//! UARTCharGet(), and UARTCharGetNonBlocking()) are used to send and receive
|
|
//! data characters in 9-bit mode.
|
|
//!
|
|
//! \note The availability of 9-bit mode varies with the Tiva part in use.
|
|
//! Please consult the datasheet for the part you are using to determine
|
|
//! whether this support is available.
|
|
//!
|
|
//! \return None.
|
|
//
|
|
//*****************************************************************************
|
|
void
|
|
UART9BitAddrSend(uint32_t ui32Base, uint8_t ui8Addr)
|
|
{
|
|
uint32_t ui32LCRH;
|
|
|
|
//
|
|
// Check the arguments.
|
|
//
|
|
ASSERT(_UARTBaseValid(ui32Base));
|
|
|
|
//
|
|
// Wait until the FIFO is empty and the UART is not busy.
|
|
//
|
|
while((HWREG(ui32Base + UART_O_FR) & (UART_FR_TXFE | UART_FR_BUSY)) !=
|
|
UART_FR_TXFE)
|
|
{
|
|
}
|
|
|
|
//
|
|
// Force the address/data bit to 1 to indicate this is an address byte.
|
|
//
|
|
ui32LCRH = HWREG(ui32Base + UART_O_LCRH);
|
|
HWREG(ui32Base + UART_O_LCRH) = ((ui32LCRH & ~UART_LCRH_EPS) |
|
|
UART_LCRH_SPS | UART_LCRH_PEN);
|
|
|
|
//
|
|
// Send the address.
|
|
//
|
|
HWREG(ui32Base + UART_O_DR) = ui8Addr;
|
|
|
|
//
|
|
// Wait until the address has been sent.
|
|
//
|
|
while((HWREG(ui32Base + UART_O_FR) & (UART_FR_TXFE | UART_FR_BUSY)) !=
|
|
UART_FR_TXFE)
|
|
{
|
|
}
|
|
|
|
//
|
|
// Restore the address/data setting.
|
|
//
|
|
HWREG(ui32Base + UART_O_LCRH) = ui32LCRH;
|
|
}
|
|
|
|
//*****************************************************************************
|
|
//
|
|
//! Enables internal loopback mode for a UART port
|
|
//!
|
|
//! \param ui32Base is the base address of the UART port.
|
|
//!
|
|
//! This function configures a UART port in internal loopback mode to help with
|
|
//! diagnostics and debug. In this mode, the transmit and receive terminals of
|
|
//! the same UART port are internally connected. Hence, the data transmitted
|
|
//! on the UnTx output is received on the UxRx input, without having to go
|
|
//! through I/O's. UARTCharPut(), UARTCharGet() functions can be used along
|
|
//! with this function.
|
|
//!
|
|
//! \return None.
|
|
//
|
|
//*****************************************************************************
|
|
void UARTLoopbackEnable(uint32_t ui32Base)
|
|
{
|
|
//
|
|
// Check the arguments.
|
|
//
|
|
ASSERT(_UARTBaseValid(ui32Base));
|
|
|
|
//
|
|
// Write the Loopback Enable bit to register.
|
|
//
|
|
HWREG(ui32Base + UART_O_CTL) |= UART_CTL_LBE;
|
|
}
|
|
|
|
//*****************************************************************************
|
|
//
|
|
// Close the Doxygen group.
|
|
//! @}
|
|
//
|
|
//*****************************************************************************
|