382 lines
11 KiB
C
382 lines
11 KiB
C
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//*****************************************************************************
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//
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// am_hal_tpiu.c
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//! @file
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//!
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//! @brief Support functions for the ARM TPIU module
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//!
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//! Provides support functions for configuring the ARM TPIU module
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//!
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//! @addtogroup tpiu2 Trace Port Interface Unit (TPIU)
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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 1.2.9 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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//! @brief Enable the clock to the TPIU module.
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//!
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//! This function enables the clock to the TPIU module.
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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_tpiu_clock_enable(void)
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{
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//
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// Enable the TPIU clock
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//
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AM_REG(MCUCTRL, TPIUCTRL) |= AM_REG_MCUCTRL_TPIUCTRL_ENABLE_M;
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}
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//*****************************************************************************
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//
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//! @brief Disable the clock to the TPIU module.
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//!
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//! This function disables the clock to the TPIU module.
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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_tpiu_clock_disable(void)
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{
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//
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// Disable the TPIU clock
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//
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AM_REG(MCUCTRL, TPIUCTRL) &= ~AM_REG_MCUCTRL_TPIUCTRL_ENABLE_M;
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}
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//*****************************************************************************
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//
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//! @brief Set the output port width of the TPIU
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//!
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//! @param ui32PortWidth - The desired port width (in bits)
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//!
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//! This function uses the TPIU_CSPSR register to set the desired output port
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//! width of the TPIU.
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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_tpiu_port_width_set(uint32_t ui32PortWidth)
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{
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AM_REG(TPIU, CSPSR) = 1 << (ui32PortWidth - 1);
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}
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//*****************************************************************************
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//
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//! @brief Read the supported_output port width of the TPIU
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//!
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//! This function uses the \e TPIU_SSPSR register to set the supported output
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//! port widths of the TPIU.
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//!
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//! @return Current width of the TPIU output port
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//
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//*****************************************************************************
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uint32_t
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am_hal_tpiu_supported_port_width_get(void)
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{
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uint32_t i, ui32WidthValue;
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//
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// Read the supported width register.
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//
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ui32WidthValue = AM_REG(TPIU, SSPSR);
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//
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// The register value is encoded in a one-hot format, so the position of
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// the single set bit determines the actual width of the port.
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//
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for (i = 1; i < 32; i++)
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{
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//
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// Check each bit for a '1'. When we find it, our current loop index
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// will be equal to the port width.
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//
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if (ui32WidthValue == (0x1 << (i - 1)))
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{
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return i;
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}
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}
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//
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// We should never get here, but if we do, just return the smallest
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// possible value for a supported trace port width.
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//
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return 1;
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}
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//*****************************************************************************
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//
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//! @brief Read the output port width of the TPIU
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//!
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//! This function uses the \e TPIU_CSPSR register to set the desired output
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//! port width of the TPIU.
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//!
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//! @return Current width of the TPIU output port
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//
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//*****************************************************************************
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uint32_t
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am_hal_tpiu_port_width_get(void)
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{
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uint32_t ui32Temp;
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uint32_t ui32Width;
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ui32Width = 1;
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ui32Temp = AM_REG(TPIU, CSPSR);
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while ( !(ui32Temp & 1) )
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{
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ui32Temp = ui32Temp >> 1;
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ui32Width++;
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if (ui32Width > 32)
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{
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ui32Width = 0;
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break;
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}
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}
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//
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// Current width of the TPIU output port.
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//
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return ui32Width;
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}
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//*****************************************************************************
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//
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//! @brief Configure the TPIU based on the values in the configuration struct.
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//!
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//! @param psConfig - pointer to an am_hal_tpiu_config_t structure containing
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//! the desired configuration information.
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//!
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//! This function reads the provided configuration structure, and sets the
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//! relevant TPIU registers to achieve the desired configuration.
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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_tpiu_configure(am_hal_tpiu_config_t *psConfig)
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{
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//
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// Set the clock freq in the MCUCTRL register.
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//
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AM_REG(MCUCTRL, TPIUCTRL) |= psConfig->ui32TraceClkIn;
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//
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// Set the desired protocol.
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//
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AM_REG(TPIU, SPPR) = psConfig->ui32PinProtocol;
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//
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// Set the parallel port width. This may be redundant if the user has
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// selected a serial protocol, but we'll set it anyway.
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//
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AM_REG(TPIU, CSPSR) = (1 << (psConfig->ui32ParallelPortSize - 1));
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//
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// Set the clock prescaler.
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//
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AM_REG(TPIU, ACPR) = psConfig->ui32ClockPrescaler;
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}
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//*****************************************************************************
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//
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//! @brief Enables the TPIU
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//!
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//! This function enables the ARM TPIU by setting the TPIU registers and then
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//! enabling the TPIU clock source in MCU control register.
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//!
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//! @param psConfig - structure for configuration.
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//! If ui32SetItmBaud, the other structure members are used to set the
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//! TPIU configuration.
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//! But for simplicity, ui32SetItmBaud can be set to one of the
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//! following, in which case all other structure members are ignored.
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//! In this case, the given BAUD rate is based on a div-by-8 HFRC clock.
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//! AM_HAL_TPIU_BAUD_57600
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//! AM_HAL_TPIU_BAUD_115200
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//! AM_HAL_TPIU_BAUD_230400
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//! AM_HAL_TPIU_BAUD_460800
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//! AM_HAL_TPIU_BAUD_500000
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//! AM_HAL_TPIU_BAUD_1M
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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_tpiu_enable(am_hal_tpiu_config_t *psConfig)
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{
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uint32_t ui32HFRC, ui32SWOscaler, ui32ITMbitrate;
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ui32ITMbitrate = psConfig->ui32SetItmBaud;
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//
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// TPIU formatter & flush control register.
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//
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AM_REG(TPIU, FFCR) = 0;
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if ( ui32ITMbitrate )
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{
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//
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// Set the Current Parallel Port Size (note - only 1 bit can be set).
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//
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AM_REG(TPIU, CSPSR) = AM_REG_TPIU_CSPSR_CWIDTH_1BIT;
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//
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// Use some default assumptions to set the ITM frequency.
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//
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if ( (ui32ITMbitrate < AM_HAL_TPIU_BAUD_57600 ) ||
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(ui32ITMbitrate > AM_HAL_TPIU_BAUD_2M ) )
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{
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ui32ITMbitrate = AM_HAL_TPIU_BAUD_DEFAULT;
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}
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//
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// Get the current HFRC frequency.
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//
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ui32HFRC = am_hal_clkgen_sysclk_get();
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//
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// Compute the SWO scaler value.
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//
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if ( ui32HFRC != 0xFFFFFFFF )
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{
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ui32SWOscaler = ((ui32HFRC / 8) / ui32ITMbitrate) - 1;
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}
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else
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{
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ui32SWOscaler = ( (AM_HAL_CLKGEN_FREQ_MAX_HZ / 8) /
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AM_HAL_TPIU_BAUD_DEFAULT ) - 1;
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}
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//
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// Set the scaler value.
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//
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AM_REG(TPIU, ACPR) = AM_REG_TPIU_ACPR_SWOSCALER(ui32SWOscaler);
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//
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// Set for UART mode
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//
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AM_REG(TPIU, SPPR) = AM_REG_TPIU_SPPR_TXMODE_UART;
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//
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// Make sure we are not in test mode (important for proper deep sleep
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// operation).
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//
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AM_REG(TPIU, ITCTRL) = AM_REG_TPIU_ITCTRL_MODE_NORMAL;
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//
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// Enable the TPIU clock source in MCU control.
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// Set TPIU clock for HFRC/8 (6 or 3 MHz) operation.
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//
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AM_REGn(MCUCTRL, 0, TPIUCTRL) =
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AM_REG_MCUCTRL_TPIUCTRL_CLKSEL_HFRC_DIV_8 |
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AM_REG_MCUCTRL_TPIUCTRL_ENABLE_EN;
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}
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else
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{
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//
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// Set the configuration according to the structure values.
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//
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//
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// Set the Asynchronous Clock Prescaler Register.
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//
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AM_REG(TPIU, ACPR) = psConfig->ui32ClockPrescaler;
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//
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// Set the Selected Pin Protocol Register.
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// e.g. AM_REG_TPIU_SPPR_TXMODE_UART
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//
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AM_REG(TPIU, SPPR) = psConfig->ui32PinProtocol;
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//
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// Set the Current Parallel Port Size (note - only 1 bit can be set).
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// This may be redundant if the user has selected a serial protocol,
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// but we'll set it anyway.
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//
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AM_REG(TPIU, CSPSR) = (1 << (psConfig->ui32ParallelPortSize - 1));
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//
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// Set the clock freq in the MCUCTRL register.
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//
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AM_REG(MCUCTRL, TPIUCTRL) |= psConfig->ui32TraceClkIn;
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}
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//
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// Wait for 50us for the data to flush out.
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//
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am_hal_itm_delay_us(50);
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}
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//*****************************************************************************
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//
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//! @brief Disables the TPIU
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//!
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//! This function disables the ARM TPIU by disabling the TPIU clock source
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//! in MCU control register.
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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_tpiu_disable(void)
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{
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//
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// Disable the TPIU clock source in MCU control.
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//
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AM_REG(MCUCTRL, TPIUCTRL) = AM_REG_MCUCTRL_TPIUCTRL_CLKSEL_0MHz |
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AM_REG_MCUCTRL_TPIUCTRL_ENABLE_DIS;
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}
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//*****************************************************************************
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//
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// End Doxygen group.
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//! @}
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//
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//*****************************************************************************
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