1161 lines
34 KiB
C
1161 lines
34 KiB
C
//*****************************************************************************
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//
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// am_hal_uart.c
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//! @file
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//!
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//! @brief Functions for interfacing with the UART.
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//!
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//! @addtogroup uart2 UART
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//! @ingroup apollo2hal
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//! @{
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//
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//*****************************************************************************
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//*****************************************************************************
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//
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// Copyright (c) 2017, Ambiq Micro
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// All rights reserved.
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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 are met:
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//
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// 1. Redistributions of source code must retain the above copyright notice,
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// this list of conditions and the following disclaimer.
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//
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// 2. 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 distribution.
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//
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// 3. Neither the name of the copyright holder nor the names of its
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// contributors may be used to endorse or promote products derived from this
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// software without specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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// CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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// POSSIBILITY OF SUCH DAMAGE.
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//
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// This is part of revision 1.2.11 of the AmbiqSuite Development Package.
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//
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//*****************************************************************************
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#include <stdint.h>
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#include <stdbool.h>
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#include "am_mcu_apollo.h"
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//*****************************************************************************
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//
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// Transmit and receive queue pointers for each UART module.
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//
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//*****************************************************************************
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am_hal_queue_t g_psTxQueue[AM_REG_UART_NUM_MODULES];
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am_hal_queue_t g_psRxQueue[AM_REG_UART_NUM_MODULES];
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//*****************************************************************************
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//
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// Power tracking structure
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//
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//*****************************************************************************
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am_hal_uart_pwrsave_t am_hal_uart_pwrsave[AM_REG_UART_NUM_MODULES];
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//*****************************************************************************
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//
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// Set Baud Rate based on the UART clock frequency.
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//
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//*****************************************************************************
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#define BAUDCLK (32)
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static void
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config_baudrate(uint32_t ui32Module, uint32_t ui32Baudrate, uint32_t ui32UartClkFreq)
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{
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uint64_t ui64FractionDivisorLong;
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uint64_t ui64IntermediateLong;
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uint32_t ui32IntegerDivisor;
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uint32_t ui32FractionDivisor;
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uint32_t ui32BaudClk;
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//
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// Calculate register values.
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//
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ui32BaudClk = BAUDCLK * ui32Baudrate;
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ui32IntegerDivisor = (uint32_t)(ui32UartClkFreq / ui32BaudClk);
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ui64IntermediateLong = (ui32UartClkFreq * 64) / ui32BaudClk;
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ui64FractionDivisorLong = ui64IntermediateLong - (ui32IntegerDivisor * 64);
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ui32FractionDivisor = (uint32_t)ui64FractionDivisorLong;
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//
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// Check the result.
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//
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am_hal_debug_assert_msg(ui32IntegerDivisor > 0, "Integer divisor MUST be greater than or equal to 1.");
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//
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// Write the UART regs.
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//
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AM_REGn(UART, ui32Module, IBRD) = ui32IntegerDivisor;
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AM_REGn(UART, ui32Module, IBRD) = ui32IntegerDivisor;
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AM_REGn(UART, ui32Module, FBRD) = ui32FractionDivisor;
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}
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//*****************************************************************************
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//
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//! @brief Set up the UART.
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//!
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//! @param psConfig pointer to a structure that holds the settings for the UART.
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//! @param ui32UartclkFreq is clock frequency that the UART is running at.
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//!
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//! This function should be used to perform the initial set-up of the UART.
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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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am_hal_uart_config(uint32_t ui32Module, am_hal_uart_config_t *psConfig)
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{
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uint32_t ui32ConfigVal = 0;
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//
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// Configure the Baudrate.
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//
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config_baudrate(ui32Module, psConfig->ui32BaudRate, am_hal_clkgen_sysclk_get());
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//
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// OR in the Data bits.
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//
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ui32ConfigVal |= psConfig->ui32DataBits;
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//
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// OR in the Two Stop bit if used.
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//
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ui32ConfigVal |= psConfig->bTwoStopBits ? AM_REG_UART_LCRH_STP2_M : 0;
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//
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// OR in the Parity.
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//
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ui32ConfigVal |= psConfig->ui32Parity;
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//
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// Write config to Line control register.
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//
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AM_REGn(UART, ui32Module, LCRH) |= ui32ConfigVal;
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//
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// Write the flow control settings to the control register.
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//
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AM_REGn(UART, ui32Module, CR) |= psConfig->ui32FlowCtrl;
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//
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// Set the clock select field for 24MHz from the HFRC
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//
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AM_REGn(UART, ui32Module, CR) |= AM_REG_UART_CR_CLKSEL_24MHZ;
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}
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//*****************************************************************************
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//
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//! @brief Gets the status.
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//!
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//! This function returns the current status.
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//!
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//! @return current status.
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//
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//*****************************************************************************
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uint32_t
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am_hal_uart_status_get(uint32_t ui32Module)
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{
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//
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// Read and return the Status.
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//
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return AM_REGn(UART, ui32Module, RSR);
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}
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//*****************************************************************************
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//
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//! @brief Gets the interrupt status.
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//!
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//! @param bEnabledOnly - If true returns the enabled interrupt status.
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//!
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//! This function returns the masked or raw interrupt status.
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//!
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//! @return Bitwise representation of the current interrupt status.
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//!
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//! The return value will be the logical OR of one or more of the following
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//! values:
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//!
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//! AM_HAL_UART_INT_OVER_RUN
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//! AM_HAL_UART_INT_BREAK_ERR
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//! AM_HAL_UART_INT_PARITY_ERR
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//! AM_HAL_UART_INT_FRAME_ERR
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//! AM_HAL_UART_INT_RX_TMOUT
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//! AM_HAL_UART_INT_TX
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//! AM_REG_UART_IER_TXIM_M
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//! AM_HAL_UART_INT_RX
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//! AM_HAL_UART_INT_DSRM
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//! AM_HAL_UART_INT_DCDM
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//! AM_HAL_UART_INT_CTSM
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//! AM_HAL_UART_INT_RIM
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//
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//*****************************************************************************
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uint32_t
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am_hal_uart_int_status_get(uint32_t ui32Module, bool bEnabledOnly)
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{
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if (bEnabledOnly)
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{
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//
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// Read and return the Masked Interrupt Status.
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//
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return AM_REGn(UART, ui32Module, MIS);
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}
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else
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{
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//
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// Read and return the Raw Interrupt Status.
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//
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return AM_REGn(UART, ui32Module, IES);
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}
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}
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//*****************************************************************************
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//
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//! @brief Clears the desired interrupts.
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//!
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//! @param ui32Interrupt - Interrupt bits to clear.
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//!
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//! This function clears the desired interrupts.
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//!
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//! ui32Interrupt should be a logical or of the following:
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//!
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//! AM_HAL_UART_INT_OVER_RUN
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//! AM_HAL_UART_INT_BREAK_ERR
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//! AM_HAL_UART_INT_PARITY_ERR
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//! AM_HAL_UART_INT_FRAME_ERR
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//! AM_HAL_UART_INT_RX_TMOUT
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//! AM_HAL_UART_INT_TX
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//! AM_REG_UART_IER_TXIM_M
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//! AM_HAL_UART_INT_RX
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//! AM_HAL_UART_INT_DSRM
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//! AM_HAL_UART_INT_DCDM
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//! AM_HAL_UART_INT_CTSM
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//! AM_HAL_UART_INT_RIM
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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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am_hal_uart_int_clear(uint32_t ui32Module, uint32_t ui32Interrupt)
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{
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//
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// Clear the bits.
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//
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AM_REGn(UART, ui32Module, IEC) = ui32Interrupt;
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}
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//*****************************************************************************
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//
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//! @brief Disables the desired interrupts.
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//!
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//! @param ui32Interrupt - Interrupt bits to disable.
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//!
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//! This function disables the desired interrupts.
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//!
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//! ui32Interrupt should be a logical or of the following:
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//!
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//! AM_HAL_UART_INT_OVER_RUN
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//! AM_HAL_UART_INT_BREAK_ERR
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//! AM_HAL_UART_INT_PARITY_ERR
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//! AM_HAL_UART_INT_FRAME_ERR
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//! AM_HAL_UART_INT_RX_TMOUT
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//! AM_HAL_UART_INT_TX
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//! AM_REG_UART_IER_TXIM_M
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//! AM_HAL_UART_INT_RX
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//! AM_HAL_UART_INT_DSRM
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//! AM_HAL_UART_INT_DCDM
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//! AM_HAL_UART_INT_CTSM
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//! AM_HAL_UART_INT_RIM
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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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am_hal_uart_int_disable(uint32_t ui32Module, uint32_t ui32Interrupt)
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{
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//
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// Disable the bits.
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//
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AM_REGn(UART, ui32Module, IER) &= ~ui32Interrupt;
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}
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//*****************************************************************************
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//
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//! @brief Enables the desired interrupts.
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//!
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//! @param ui32Interrupt - Interrupt bits to enable.
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//!
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//! This function enables the desired interrupts.
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//!
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//! ui32Interrupt should be a logical or of the following:
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//!
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//! AM_HAL_UART_INT_OVER_RUN
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//! AM_HAL_UART_INT_BREAK_ERR
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//! AM_HAL_UART_INT_PARITY_ERR
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//! AM_HAL_UART_INT_FRAME_ERR
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//! AM_HAL_UART_INT_RX_TMOUT
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//! AM_HAL_UART_INT_TX
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//! AM_REG_UART_IER_TXIM_M
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//! AM_HAL_UART_INT_RX
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//! AM_HAL_UART_INT_DSRM
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//! AM_HAL_UART_INT_DCDM
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//! AM_HAL_UART_INT_CTSM
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//! AM_HAL_UART_INT_RIM
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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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am_hal_uart_int_enable(uint32_t ui32Module, uint32_t ui32Interrupt)
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{
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//
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// Enable the interrupts.
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//
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AM_REGn(UART, ui32Module, IER) |= ui32Interrupt;
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}
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//*****************************************************************************
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//
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//! @brief Returns the enabled interrupts.
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//!
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//! This function return the enabled interrupts.
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//!
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//! @return the enabled interrupts. This will be a logical or of the following:
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//!
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//! AM_HAL_UART_INT_OVER_RUN
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//! AM_HAL_UART_INT_BREAK_ERR
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//! AM_HAL_UART_INT_PARITY_ERR
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//! AM_HAL_UART_INT_FRAME_ERR
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//! AM_HAL_UART_INT_RX_TMOUT
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//! AM_HAL_UART_INT_TX
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//! AM_REG_UART_IER_TXIM_M
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//! AM_HAL_UART_INT_RX
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//! AM_HAL_UART_INT_DSRM
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//! AM_HAL_UART_INT_DCDM
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//! AM_HAL_UART_INT_CTSM
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//! AM_HAL_UART_INT_RIM
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//!
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//! @return Returns the enabled interrupts.
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//
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//*****************************************************************************
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uint32_t
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am_hal_uart_int_enable_get(uint32_t ui32Module)
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{
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//
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// Return the enabled interrupts.
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//
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return AM_REGn(UART, ui32Module, IER);
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}
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//*****************************************************************************
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//
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//! @brief Enable the UART, RX, and TX.
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//!
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//! This function enables the UART, RX, and TX.
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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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am_hal_uart_enable(uint32_t ui32Module)
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{
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//
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// Enable the UART, RX, and TX.
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//
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AM_REGan_SET(UART, ui32Module, CR, (AM_REG_UART_CR_UARTEN_M |
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AM_REG_UART_CR_RXE_M |
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AM_REG_UART_CR_TXE_M) );
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}
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//*****************************************************************************
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//
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//! @brief Disable the UART, RX, and TX.
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//!
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//! This function disables the UART, RX, and TX.
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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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am_hal_uart_disable(uint32_t ui32Module)
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{
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//
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// Disable the UART.
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//
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AM_REGan_CLR(UART, ui32Module, CR, (AM_REG_UART_CR_UARTEN_M |
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AM_REG_UART_CR_RXE_M |
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AM_REG_UART_CR_TXE_M) );
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}
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//*****************************************************************************
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//
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//! @brief Enable the UART in the power control block.
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//!
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//! This function enables the UART device in the power control block.
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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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am_hal_uart_pwrctrl_enable(uint32_t ui32Module)
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{
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//
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// Check to make sure we're acting on a real UART module.
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//
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am_hal_debug_assert_msg(ui32Module < AM_REG_UART_NUM_MODULES,
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"Trying to disable a UART module that doesn't exist");
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am_hal_pwrctrl_periph_enable(AM_HAL_PWRCTRL_UART0 << ui32Module);
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}
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//*****************************************************************************
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//
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//! @brief Disable the UART in the power control block.
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//!
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//! This function disables the UART device in the power control block.
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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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am_hal_uart_pwrctrl_disable(uint32_t ui32Module)
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{
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//
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// Check to make sure we're acting on a real UART module.
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//
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am_hal_debug_assert_msg(ui32Module < AM_REG_UART_NUM_MODULES,
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"Trying to disable a UART module that doesn't exist");
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am_hal_pwrctrl_periph_disable(AM_HAL_PWRCTRL_UART0 << ui32Module);
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}
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//*****************************************************************************
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//
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//! @brief Enable the UART in the power control block.
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//!
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//! This function enables the UART device in the power control block.
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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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am_hal_uart_power_on_restore(uint32_t ui32Module)
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{
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//
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// Check to make sure we're acting on a real UART module.
|
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//
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am_hal_debug_assert_msg(ui32Module < AM_REG_UART_NUM_MODULES,
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"Trying to enable a UART module that doesn't exist");
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//
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// Make sure this restore is a companion to a previous save call.
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//
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if ( am_hal_uart_pwrsave[ui32Module].bValid == 0 )
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{
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return;
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}
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|
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//
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// Enable power to the selected UART
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//
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am_hal_pwrctrl_periph_enable(AM_HAL_PWRCTRL_UART0 << ui32Module);
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|
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//
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// Restore the clock settings
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//
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am_hal_clkgen_uarten_set(ui32Module, am_hal_uart_pwrsave[ui32Module].UARTEN);
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|
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//
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// Restore the configuration registers from the global variable in SRAM.
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//
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AM_REGn(UART, ui32Module, ILPR) = am_hal_uart_pwrsave[ui32Module].ILPR;
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AM_REGn(UART, ui32Module, IBRD) = am_hal_uart_pwrsave[ui32Module].IBRD;
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AM_REGn(UART, ui32Module, FBRD) = am_hal_uart_pwrsave[ui32Module].FBRD;
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AM_REGn(UART, ui32Module, LCRH) = am_hal_uart_pwrsave[ui32Module].LCRH;
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AM_REGn(UART, ui32Module, CR) = am_hal_uart_pwrsave[ui32Module].CR;
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AM_REGn(UART, ui32Module, IFLS) = am_hal_uart_pwrsave[ui32Module].IFLS;
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AM_REGn(UART, ui32Module, IER) = am_hal_uart_pwrsave[ui32Module].IER;
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|
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//
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// Indicates we have restored the configuration.
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//
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am_hal_uart_pwrsave[ui32Module].bValid = 0;
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return;
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}
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|
|
//*****************************************************************************
|
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//
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//! @brief Disable the UART in the power control block.
|
|
//!
|
|
//! This function disables the UART device in the power control block.
|
|
//!
|
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//! @return None.
|
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//
|
|
//*****************************************************************************
|
|
void
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am_hal_uart_power_off_save(uint32_t ui32Module)
|
|
{
|
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//
|
|
// Check to make sure we're acting on a real UART module.
|
|
//
|
|
am_hal_debug_assert_msg(ui32Module < AM_REG_UART_NUM_MODULES,
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"Trying to disable a UART module that doesn't exist");
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|
|
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//
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// Save all of the configuration register information for the selected
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// UART.
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//
|
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am_hal_uart_pwrsave[ui32Module].ILPR = AM_REGn(UART, ui32Module, ILPR);
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am_hal_uart_pwrsave[ui32Module].IBRD = AM_REGn(UART, ui32Module, IBRD);
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am_hal_uart_pwrsave[ui32Module].FBRD = AM_REGn(UART, ui32Module, FBRD);
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am_hal_uart_pwrsave[ui32Module].LCRH = AM_REGn(UART, ui32Module, LCRH);
|
|
am_hal_uart_pwrsave[ui32Module].CR = AM_REGn(UART, ui32Module, CR);
|
|
am_hal_uart_pwrsave[ui32Module].IFLS = AM_REGn(UART, ui32Module, IFLS);
|
|
am_hal_uart_pwrsave[ui32Module].IER = AM_REGn(UART, ui32Module, IER);
|
|
|
|
//
|
|
// Save the clock setting and disable power to the selected UART.
|
|
// Save the current enable value.
|
|
//
|
|
am_hal_uart_pwrsave[ui32Module].UARTEN =
|
|
(AM_REG(CLKGEN, UARTEN) & AM_HAL_CLKGEN_UARTEN_UARTENn_M(ui32Module)) >>
|
|
AM_HAL_CLKGEN_UARTEN_UARTENn_S(ui32Module);
|
|
|
|
//
|
|
// Disable the UART.
|
|
//
|
|
am_hal_clkgen_uarten_set(ui32Module, AM_HAL_CLKGEN_UARTEN_DIS);
|
|
|
|
//
|
|
// Indicates we have a valid saved configuration.
|
|
//
|
|
am_hal_uart_pwrsave[ui32Module].bValid = 1;
|
|
|
|
//
|
|
// Disable power to the selected UART.
|
|
//
|
|
am_hal_pwrctrl_periph_disable(AM_HAL_PWRCTRL_UART0 << ui32Module);
|
|
|
|
return;
|
|
}
|
|
|
|
//*****************************************************************************
|
|
//
|
|
//! @brief Enable the UART clock.
|
|
//!
|
|
//! This function enables the clock to the UART.
|
|
//!
|
|
//! @return None.
|
|
//
|
|
//*****************************************************************************
|
|
void
|
|
am_hal_uart_clock_enable(uint32_t ui32Module)
|
|
{
|
|
//
|
|
// Set CLKGEN.UARTEN, clear the field then write the desired enable value
|
|
// Valid enable values are DIS, EN, REDUCE_FREQ, EN_POWER_SAV.
|
|
//
|
|
am_hal_clkgen_uarten_set(ui32Module, AM_HAL_CLKGEN_UARTEN_EN);
|
|
|
|
//
|
|
// Enable the UART clock.
|
|
//
|
|
AM_REGn(UART, ui32Module, CR) |= AM_REG_UART_CR_CLKEN_M;
|
|
|
|
//
|
|
// Select default UART clock source
|
|
//
|
|
AM_REGn(UART, ui32Module, CR) |= AM_REG_UART_CR_CLKSEL_24MHZ;
|
|
}
|
|
|
|
//*****************************************************************************
|
|
//
|
|
//! @brief Disable the UART clock.
|
|
//!
|
|
//! This function disables the clock to the UART.
|
|
//!
|
|
//! @return None.
|
|
//
|
|
//*****************************************************************************
|
|
void
|
|
am_hal_uart_clock_disable(uint32_t ui32Module)
|
|
{
|
|
//
|
|
// Disable the UART clock.
|
|
//
|
|
AM_REGn(UART, ui32Module, CR) &= ~AM_REG_UART_CR_CLKEN_M;
|
|
|
|
//
|
|
// Disable the UART clock in the CLKGEN module.
|
|
//
|
|
am_hal_clkgen_uarten_set(ui32Module, AM_HAL_CLKGEN_UARTEN_DIS);
|
|
}
|
|
|
|
//*****************************************************************************
|
|
//
|
|
//! @brief Set and enable the desired interrupt levels for the RX/TX fifo.
|
|
//!
|
|
//! @param ui32LvlCfg - Desired FIFO RX/TX levels.
|
|
//!
|
|
//! This function sets the desired interrupt levels for the RX/TX fifo and
|
|
//! enables the use of transmit and receive FIFO buffers.
|
|
//!
|
|
//! Valid values for ui32LvlCfg are:
|
|
//!
|
|
//! AM_HAL_UART_TX_FIFO_1_8
|
|
//! AM_HAL_UART_TX_FIFO_1_4
|
|
//! AM_HAL_UART_TX_FIFO_1_2
|
|
//! AM_HAL_UART_TX_FIFO_3_4
|
|
//! AM_HAL_UART_TX_FIFO_7_8
|
|
//!
|
|
//! AM_HAL_UART_RX_FIFO_1_8
|
|
//! AM_HAL_UART_RX_FIFO_1_4
|
|
//! AM_HAL_UART_RX_FIFO_1_2
|
|
//! AM_HAL_UART_RX_FIFO_3_4
|
|
//! AM_HAL_UART_RX_FIFO_7_8
|
|
//!
|
|
//! @return None.
|
|
//
|
|
//*****************************************************************************
|
|
void
|
|
am_hal_uart_fifo_config(uint32_t ui32Module, uint32_t ui32LvlCfg)
|
|
{
|
|
//
|
|
// Enable the use of FIFOs.
|
|
//
|
|
AM_REGn(UART, ui32Module, LCRH) |= AM_REG_UART_LCRH_FEN_M;
|
|
|
|
//
|
|
// Write the FIFO level register.
|
|
//
|
|
AM_REGn(UART, ui32Module, IFLS) = ui32LvlCfg;
|
|
}
|
|
|
|
//*****************************************************************************
|
|
//
|
|
//! @brief Return the UART Flags.
|
|
//!
|
|
//! This function reads and returns the UART flags.
|
|
//!
|
|
//! @return Returns the Flags.
|
|
//
|
|
//*****************************************************************************
|
|
uint32_t
|
|
am_hal_uart_flags_get(uint32_t ui32Module)
|
|
{
|
|
//
|
|
// Read and return the Flags.
|
|
//
|
|
return AM_REGn(UART, ui32Module, FR);
|
|
}
|
|
|
|
//*****************************************************************************
|
|
//
|
|
//! @brief Outputs a single character using polling.
|
|
//!
|
|
//! @param cChar - Character to send.
|
|
//!
|
|
//! This function outputs a single character using polling.
|
|
//!
|
|
//! @return None.
|
|
//
|
|
//*****************************************************************************
|
|
void
|
|
am_hal_uart_char_transmit_polled(uint32_t ui32Module, char cChar)
|
|
{
|
|
//
|
|
// Wait for space, i.e. TX FIFO EMPTY
|
|
//
|
|
while (AM_BFRn(UART, ui32Module, FR, TXFF));
|
|
|
|
//
|
|
// Write the char.
|
|
//
|
|
AM_REGn(UART, ui32Module, DR) = cChar;
|
|
}
|
|
|
|
//*****************************************************************************
|
|
//
|
|
//! @brief Outputs a zero terminated string using polling.
|
|
//!
|
|
//! @param pcString - Pointer to character string to send.
|
|
//!
|
|
//! This function outputs a zero terminated string using polling.
|
|
//!
|
|
//! @return None.
|
|
//
|
|
//*****************************************************************************
|
|
void
|
|
am_hal_uart_string_transmit_polled(uint32_t ui32Module, char *pcString)
|
|
{
|
|
while (*pcString)
|
|
{
|
|
//
|
|
// Wait for space, i.e. TX FIFO EMPTY.
|
|
//
|
|
while (AM_BFRn(UART, ui32Module, FR, TXFF));
|
|
|
|
//
|
|
// Write the char.
|
|
//
|
|
AM_REGn(UART, ui32Module, DR) = *pcString++;
|
|
}
|
|
}
|
|
|
|
//*****************************************************************************
|
|
//
|
|
//! @brief Receives a character using polling.
|
|
//!
|
|
//! @param pcChar - Pointer to character to store received char.
|
|
//!
|
|
//! This function receives a character using polling.
|
|
//!
|
|
//! @return None.
|
|
//
|
|
//*****************************************************************************
|
|
void
|
|
am_hal_uart_char_receive_polled(uint32_t ui32Module, char *pcChar)
|
|
{
|
|
//
|
|
// Wait for data, i.e. RX FIFO NOT EMPTY.
|
|
//
|
|
while (AM_BFRn(UART, ui32Module, FR, RXFE));
|
|
|
|
//
|
|
// Save the char.
|
|
//
|
|
*pcChar = AM_REGn(UART, ui32Module, DR);
|
|
}
|
|
|
|
//*****************************************************************************
|
|
//
|
|
//! @brief Receives one line using polling.
|
|
//!
|
|
//! @param ui32MaxChars - Maximum number of characters to receive.
|
|
//! @param pcChar - Pointer to character string to store received line.
|
|
//!
|
|
//! This function receives a line (delimited by '/n' or '/r') using polling.
|
|
//! Line buffer is 0 (NULL) terminated.
|
|
//!
|
|
//! @return None.
|
|
//
|
|
//*****************************************************************************
|
|
void
|
|
am_hal_uart_line_receive_polled(uint32_t ui32Module,
|
|
uint32_t ui32MaxChars,
|
|
char *pcChar)
|
|
{
|
|
char cRecChar;
|
|
uint32_t i;
|
|
|
|
//
|
|
// Loop until we receive ui32MaxChars or receive a line ending.
|
|
//
|
|
for (i = 0; i < (ui32MaxChars - 1); i++)
|
|
{
|
|
//
|
|
// Get char.
|
|
//
|
|
am_hal_uart_char_receive_polled(ui32Module, &cRecChar);
|
|
|
|
if ((cRecChar == '\n') || (cRecChar == '\r'))
|
|
{
|
|
//
|
|
// Zero terminate the buffer.
|
|
//
|
|
*pcChar = 0;
|
|
|
|
return;
|
|
}
|
|
|
|
*pcChar++ = cRecChar;
|
|
}
|
|
}
|
|
|
|
//*****************************************************************************
|
|
//
|
|
//! @brief Initialize the buffered UART.
|
|
//!
|
|
//! @param pui8RxArray - Pointer to the RX buffer to fill.
|
|
//! @param ui32RxSize - size of RX buffer.
|
|
//! @param pui8TxArray - Pointer to the TX buffer to fill.
|
|
//! @param ui32TxSize - size of TX buffer.
|
|
//!
|
|
//! This function initializes the buffered UART.
|
|
//!
|
|
//! @return None.
|
|
//
|
|
//*****************************************************************************
|
|
void
|
|
am_hal_uart_init_buffered(uint32_t ui32Module,
|
|
uint8_t *pui8RxArray, uint32_t ui32RxSize,
|
|
uint8_t *pui8TxArray, uint32_t ui32TxSize)
|
|
{
|
|
//
|
|
// Enable the UART RX timeout interrupt.
|
|
//
|
|
AM_REGn(UART, ui32Module, IER) |= (AM_REG_UART_IES_RTRIS_M |
|
|
AM_REG_UART_IES_TXRIS_M);
|
|
|
|
//
|
|
// Initialize the ring buffers.
|
|
//
|
|
am_hal_queue_init(&g_psTxQueue[ui32Module], pui8TxArray, 1, ui32TxSize);
|
|
am_hal_queue_init(&g_psRxQueue[ui32Module], pui8RxArray, 1, ui32RxSize);
|
|
}
|
|
|
|
//*****************************************************************************
|
|
//
|
|
//! @brief Get the status of the buffered UART.
|
|
//!
|
|
//! @param pui32RxSize - Pointer to variable to return the Rx ring data size.
|
|
//! @param pui32TxSize - Pointer to variable to return the Tx ring data size.
|
|
//!
|
|
//! This function gets the status of the buffered UART.
|
|
//!
|
|
//! @return None.
|
|
//
|
|
//*****************************************************************************
|
|
void
|
|
am_hal_uart_get_status_buffered(uint32_t ui32Module,
|
|
uint32_t *pui32RxSize,
|
|
uint32_t *pui32TxSize)
|
|
{
|
|
//
|
|
// Return the current size of ring buffers.
|
|
//
|
|
if ( pui32RxSize )
|
|
{
|
|
*pui32RxSize = am_hal_queue_data_left(&g_psRxQueue[ui32Module]);
|
|
}
|
|
|
|
if ( pui32TxSize )
|
|
{
|
|
*pui32TxSize = am_hal_queue_data_left(&g_psTxQueue[ui32Module]);
|
|
}
|
|
}
|
|
|
|
|
|
//*****************************************************************************
|
|
//
|
|
//! @brief Services the buffered UART.
|
|
//!
|
|
//! @param ui32Status is the contents of the UART interrupt status register.
|
|
//!
|
|
//! This function is responsible for servicing the buffered UART. Designed to
|
|
//! be called from the UART interrupt handler.
|
|
//!
|
|
//! @return None
|
|
//
|
|
//*****************************************************************************
|
|
void
|
|
am_hal_uart_service_buffered(uint32_t ui32Module, uint32_t ui32Status)
|
|
{
|
|
uint8_t ui8Character = '\x00';
|
|
uint32_t ui32FifoEntry = 0;
|
|
|
|
//
|
|
// Check to see if we have filled the Rx FIFO past the configured limit, or
|
|
// if we have an 'old' character or two sitting in the FIFO.
|
|
//
|
|
if (ui32Status & (AM_REG_UART_IES_RXRIS_M | AM_REG_UART_IES_RTRIS_M))
|
|
{
|
|
//
|
|
// While there's stuff in the RX fifo....
|
|
//
|
|
while (!AM_BFRn(UART, ui32Module, FR, RXFE))
|
|
{
|
|
//
|
|
// Read each character out one by one, and add it to the ring
|
|
// buffer. This will start losing bytes if the fifo ever overflows.
|
|
//
|
|
ui32FifoEntry = AM_REGn(UART, ui32Module , DR);
|
|
|
|
//
|
|
// As long as no error bits were set, we should push this byte to
|
|
// the FIFO.
|
|
//
|
|
if ( (ui32FifoEntry & 0xF00) == 0 )
|
|
{
|
|
ui8Character = ui32FifoEntry & 0xFF;
|
|
am_hal_queue_item_add(&g_psRxQueue[ui32Module], &ui8Character, 1);
|
|
}
|
|
}
|
|
}
|
|
|
|
//
|
|
// Check to see if our TX buffer has been recently emptied. If so, we
|
|
// should refill it from the TX ring buffer.
|
|
//
|
|
if (ui32Status & AM_REG_UART_IES_TXRIS_M)
|
|
{
|
|
//
|
|
// Keep refilling until the fifo is full, or the ring buffer is empty,
|
|
// whichever happens first.
|
|
//
|
|
while (am_hal_queue_data_left(&g_psTxQueue[ui32Module]) &&
|
|
!AM_BFRn(UART, ui32Module, FR, TXFF))
|
|
{
|
|
am_hal_queue_item_get(&g_psTxQueue[ui32Module], &ui8Character, 1);
|
|
AM_REGn(UART, ui32Module , DR) = ui8Character;
|
|
}
|
|
}
|
|
}
|
|
|
|
//*****************************************************************************
|
|
//
|
|
//! @brief Services the buffered UART.
|
|
//!
|
|
//! @param ui32Status is the contents of the UART interrupt status register.
|
|
//!
|
|
//! This function is responsible for servicing the buffered UART. Designed to
|
|
//! be called from the UART interrupt handler.
|
|
//!
|
|
//! This function behaves exactly like am_hal_uart_service_buffered() \e except
|
|
//! it does not completely empty the RX FIFO on every interrupt event. Instead,
|
|
//! it will leave at least one byte behind until it receives a UART RX TIMEOUT
|
|
//! interrupt. If you use this service routine, you can treat the RX TIMEOUT
|
|
//! interrupt as a UART IDLE interrupt. Every time the UART RX line goes IDLE
|
|
//! for 32 consecutive bit-times you WILL receive a UART RX TIMEOUT interrupt.
|
|
//! This behavior is not guaranteed for am_hal_uart_service_buffered().
|
|
//!
|
|
//! @return None
|
|
//
|
|
//*****************************************************************************
|
|
void
|
|
am_hal_uart_service_buffered_timeout_save(uint32_t ui32Module, uint32_t ui32Status)
|
|
{
|
|
uint8_t ui8Character = '\x00';
|
|
uint32_t ui32Count = 0;
|
|
uint32_t ui32FifoEntry = 0;
|
|
|
|
//
|
|
// Check to see if we have filled the Rx FIFO past the configured limit, or
|
|
// if we have an 'old' character or two sitting in the FIFO.
|
|
//
|
|
if (ui32Status & (AM_REG_UART_IES_RXRIS_M | AM_REG_UART_IES_RTRIS_M))
|
|
{
|
|
//
|
|
// Check to see what our FIFO configuration setting is.
|
|
//
|
|
uint32_t ui32FifoThreshold;
|
|
uint32_t ui32FifoCfg = AM_BFMn(UART, ui32Module, IFLS, RXIFLSEL);
|
|
|
|
//
|
|
// Compute the number of bytes for receive interrupt from the FIFO level
|
|
// register.
|
|
//
|
|
switch(ui32FifoCfg)
|
|
{
|
|
case AM_HAL_UART_RX_FIFO_1_8: ui32FifoThreshold = 4; break;
|
|
case AM_HAL_UART_RX_FIFO_1_4: ui32FifoThreshold = 8; break;
|
|
case AM_HAL_UART_RX_FIFO_1_2: ui32FifoThreshold = 16; break;
|
|
case AM_HAL_UART_RX_FIFO_3_4: ui32FifoThreshold = 24; break;
|
|
case AM_HAL_UART_RX_FIFO_7_8: ui32FifoThreshold = 28; break;
|
|
default:
|
|
ui32FifoThreshold = 32;
|
|
}
|
|
|
|
//
|
|
// While there's stuff in the RX fifo....
|
|
//
|
|
while (!AM_BFRn(UART, ui32Module, FR, RXFE))
|
|
{
|
|
//
|
|
// Read each character out one by one, and add it to the ring
|
|
// buffer. This will start losing bytes if the fifo ever overflows.
|
|
//
|
|
ui32FifoEntry = AM_REGn(UART, ui32Module, DR);
|
|
|
|
//
|
|
// As long as no error bits were set, we should push this byte to
|
|
// the FIFO.
|
|
//
|
|
if ( (ui32FifoEntry & 0xF00) == 0)
|
|
{
|
|
ui8Character = ui32FifoEntry & 0xFF;
|
|
am_hal_queue_item_add(&g_psRxQueue[ui32Module], &ui8Character, 1);
|
|
}
|
|
|
|
//
|
|
// Leave one byte to trigger the RX timeout interrupt.
|
|
//
|
|
if ( ++ui32Count >= (ui32FifoThreshold - 1) )
|
|
{
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
//
|
|
// Check to see if our TX buffer has been recently emptied. If so, we
|
|
// should refill it from the TX ring buffer.
|
|
//
|
|
if (ui32Status & AM_REG_UART_IES_TXRIS_M)
|
|
{
|
|
//
|
|
// Keep refilling until the fifo is full, or the ring buffer is empty,
|
|
// whichever happens first.
|
|
//
|
|
while (am_hal_queue_data_left(&g_psTxQueue[ui32Module]) &&
|
|
!AM_BFRn(UART, ui32Module, FR, TXFF))
|
|
{
|
|
am_hal_queue_item_get(&g_psTxQueue[ui32Module], &ui8Character, 1);
|
|
AM_REGn(UART, ui32Module , DR) = ui8Character;
|
|
}
|
|
}
|
|
}
|
|
|
|
//*****************************************************************************
|
|
//
|
|
//! @brief Puts a char in the buffer or directly to the fifo if available.
|
|
//!
|
|
//! @param cChar - Character to send.
|
|
//!
|
|
//! This function puts a character in the buffer or directly to the fifo.
|
|
//!
|
|
//! @return None.
|
|
//
|
|
//*****************************************************************************
|
|
void
|
|
am_hal_uart_char_transmit_buffered(uint32_t ui32Module, char cChar)
|
|
{
|
|
//
|
|
// Check the status of the Tx fifo and the Tx ring buffer.
|
|
//
|
|
if (am_hal_queue_empty(&g_psTxQueue[ui32Module]) &&
|
|
!AM_BFRn(UART, ui32Module, FR, TXFF))
|
|
{
|
|
//
|
|
// If the fifo isn't full yet, and the ring buffer isn't being used,
|
|
// just write the new character directly to the fifo.
|
|
//
|
|
AM_REGn(UART, ui32Module, DR) = cChar;
|
|
}
|
|
else
|
|
{
|
|
//
|
|
// If we get here, either the fifo is full, or the ring buffer is
|
|
// already in use. In either case, we need to use the ring buffer
|
|
// to make sure that the transmitted data gets sent in the right
|
|
// order. If the buffer is already full, we will simply lose this
|
|
// byte.
|
|
//
|
|
am_hal_queue_item_add(&g_psTxQueue[ui32Module], &cChar, 1);
|
|
}
|
|
}
|
|
|
|
//*****************************************************************************
|
|
//
|
|
//! @brief Puts a null terminaled string in the buffer or directly to the fifo.
|
|
//!
|
|
//! @param pcString - Pointer to buffer used for sending.
|
|
//!
|
|
//! This function puts a string in the buffer or directly to the fifo if there
|
|
//! is space available.
|
|
//!
|
|
//! @return None.
|
|
//
|
|
//*****************************************************************************
|
|
void
|
|
am_hal_uart_string_transmit_buffered(uint32_t ui32Module, char *pcString)
|
|
{
|
|
//
|
|
// Check the status of the Tx fifo and the Tx ring buffer.
|
|
//
|
|
while (*pcString)
|
|
{
|
|
if (am_hal_queue_empty(&g_psTxQueue[ui32Module]) &&
|
|
!AM_BFRn(UART, ui32Module, FR, TXFF))
|
|
{
|
|
//
|
|
// If the fifo isn't full yet, and the ring buffer isn't being used,
|
|
// just write the new character directly to the fifo.
|
|
//
|
|
AM_REGn(UART, ui32Module, DR) = *pcString;
|
|
}
|
|
else
|
|
{
|
|
//
|
|
// If we get here, either the fifo is full, or the ring buffer is
|
|
// already in use. In either case, we need to use the ring buffer
|
|
// to make sure that the transmitted data gets sent in the right
|
|
// order. If the buffer is already full, we will simply lose this
|
|
// byte.
|
|
//
|
|
am_hal_queue_item_add(&g_psTxQueue[ui32Module], pcString, 1);
|
|
}
|
|
|
|
//
|
|
// Move the pointer to the next character.
|
|
//
|
|
pcString++;
|
|
}
|
|
}
|
|
|
|
//*****************************************************************************
|
|
//
|
|
//! @brief Returns n number of characters from the ring buffer or until empty.
|
|
//!
|
|
//! @param pcString - Pointer to buffer for putting received characters.
|
|
//! @param ui32MaxChars - Maximum number of characters to receive.
|
|
//!
|
|
//! This function puts a char string in the buffer.
|
|
//!
|
|
//! @return Returns the number of chars received.
|
|
//
|
|
//*****************************************************************************
|
|
uint32_t
|
|
am_hal_uart_char_receive_buffered(uint32_t ui32Module,
|
|
char *pcString,
|
|
uint32_t ui32MaxChars)
|
|
{
|
|
uint32_t ui32NumChars = 0;
|
|
|
|
//
|
|
// Loop until ui32MaxChars or until empty.
|
|
//
|
|
while (am_hal_queue_data_left(&g_psRxQueue[ui32Module]) && ui32MaxChars)
|
|
{
|
|
//
|
|
// Pull a char out of the ring buffer.
|
|
//
|
|
am_hal_queue_item_get(&g_psRxQueue[ui32Module], pcString, 1);
|
|
|
|
//
|
|
// Subtract from ui32MaxChars.
|
|
// Add to ui32NumChars.
|
|
// Move pointer in buffer.
|
|
//
|
|
ui32MaxChars--;
|
|
ui32NumChars++;
|
|
pcString++;
|
|
}
|
|
|
|
//
|
|
// return the number of chars received.
|
|
//
|
|
return ui32NumChars;
|
|
}
|
|
|
|
//*****************************************************************************
|
|
//
|
|
// End Doxygen group.
|
|
//! @}
|
|
//
|
|
//*****************************************************************************
|