256 lines
9.5 KiB
C
256 lines
9.5 KiB
C
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/*
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Copyright (C) 2014..2017 Marco Veeneman
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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/**
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* @file GPTM/hal_st_lld.c
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* @brief ST Driver subsystem low level driver code.
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*
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* @addtogroup ST
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* @{
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*/
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#include "hal.h"
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#if (OSAL_ST_MODE != OSAL_ST_MODE_NONE) || defined(__DOXYGEN__)
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/*===========================================================================*/
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/* Driver local definitions. */
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/*===========================================================================*/
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#if OSAL_ST_MODE == OSAL_ST_MODE_FREERUNNING
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#if (TIVA_ST_USE_WIDE_TIMER == TRUE)
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#if TIVA_ST_TIMER_NUMBER == 0
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#define ST_HANDLER TIVA_WGPT0A_HANDLER
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#define ST_NUMBER TIVA_WGPT0A_NUMBER
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#define ST_ENABLE_CLOCK() (HWREG(SYSCTL_RCGCWTIMER) |= (1 << 0))
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#define ST_WAIT_CLOCK() while (!(HWREG(SYSCTL_PRWTIMER) & (1 << 0)))
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#elif TIVA_ST_TIMER_NUMBER == 1
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#define ST_HANDLER TIVA_WGPT1A_HANDLER
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#define ST_NUMBER TIVA_WGPT1A_NUMBER
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#define ST_ENABLE_CLOCK() (HWREG(SYSCTL_RCGCWTIMER) |= (1 << 1))
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#define ST_WAIT_CLOCK() while (!(HWREG(SYSCTL_PRWTIMER) & (1 << 1)))
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#elif TIVA_ST_TIMER_NUMBER == 2
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#define ST_HANDLER TIVA_WGPT2A_HANDLER
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#define ST_NUMBER TIVA_WGPT2A_NUMBER
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#define ST_ENABLE_CLOCK() (HWREG(SYSCTL_RCGCWTIMER) |= (1 << 2))
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#define ST_WAIT_CLOCK() while (!(HWREG(SYSCTL_PRWTIMER) & (1 << 2)))
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#elif TIVA_ST_TIMER_NUMBER == 3
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#define ST_HANDLER TIVA_WGPT3A_HANDLER
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#define ST_NUMBER TIVA_WGPT3A_NUMBER
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#define ST_ENABLE_CLOCK() (HWREG(SYSCTL_RCGCWTIMER) |= (1 << 3))
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#define ST_WAIT_CLOCK() while (!(HWREG(SYSCTL_PRWTIMER) & (1 << 3)))
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#elif TIVA_ST_TIMER_NUMBER == 4
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#define ST_HANDLER TIVA_WGPT4A_HANDLER
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#define ST_NUMBER TIVA_WGPT4A_NUMBER
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#define ST_ENABLE_CLOCK() (HWREG(SYSCTL_RCGCWTIMER) |= (1 << 4))
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#define ST_WAIT_CLOCK() while (!(HWREG(SYSCTL_PRWTIMER) & (1 << 4)))
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#elif TIVA_ST_TIMER_NUMBER == 5
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#define ST_HANDLER TIVA_WGPT5A_HANDLER
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#define ST_NUMBER TIVA_WGPT5A_NUMBER
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#define ST_ENABLE_CLOCK() (HWREG(SYSCTL_RCGCWTIMER) |= (1 << 5))
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#define ST_WAIT_CLOCK() while (!(HWREG(SYSCTL_PRWTIMER) & (1 << 5)))
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#else
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#error "TIVA_ST_USE_TIMER specifies an unsupported timer"
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#endif
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#if (TIVA_SYSCLK / OSAL_ST_FREQUENCY) - 1 > 0xFFFF
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#error "the selected ST frequency is not obtainable because TIM timer prescaler limits"
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#endif
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#elif (TIVA_ST_USE_WIDE_TIMER == FALSE)
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#if TIVA_ST_TIMER_NUMBER == 0
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#define ST_HANDLER TIVA_GPT0A_HANDLER
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#define ST_NUMBER TIVA_GPT0A_NUMBER
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#define ST_ENABLE_CLOCK() (HWREG(SYSCTL_RCGCTIMER) |= (1 << 0))
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#define ST_WAIT_CLOCK() while (!(HWREG(SYSCTL_PRTIMER) & (1 << 0)))
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#elif TIVA_ST_TIMER_NUMBER == 1
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#define ST_HANDLER TIVA_GPT1A_HANDLER
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#define ST_NUMBER TIVA_GPT1A_NUMBER
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#define ST_ENABLE_CLOCK() (HWREG(SYSCTL_RCGCTIMER) |= (1 << 1))
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#define ST_WAIT_CLOCK() while (!(HWREG(SYSCTL_PRTIMER) & (1 << 1)))
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#elif TIVA_ST_TIMER_NUMBER == 2
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#define ST_HANDLER TIVA_GPT2A_HANDLER
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#define ST_NUMBER TIVA_GPT2A_NUMBER
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#define ST_ENABLE_CLOCK() (HWREG(SYSCTL_RCGCTIMER) |= (1 << 2))
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#define ST_WAIT_CLOCK() while (!(HWREG(SYSCTL_PRTIMER) & (1 << 2)))
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#elif TIVA_ST_TIMER_NUMBER == 3
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#define ST_HANDLER TIVA_GPT3A_HANDLER
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#define ST_NUMBER TIVA_GPT3A_NUMBER
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#define ST_ENABLE_CLOCK() (HWREG(SYSCTL_RCGCTIMER) |= (1 << 3))
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#define ST_WAIT_CLOCK() while (!(HWREG(SYSCTL_PRTIMER) & (1 << 3)))
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#elif TIVA_ST_TIMER_NUMBER == 4
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#define ST_HANDLER TIVA_GPT4A_HANDLER
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#define ST_NUMBER TIVA_GPT4A_NUMBER
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#define ST_ENABLE_CLOCK() (HWREG(SYSCTL_RCGCTIMER) |= (1 << 4))
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#define ST_WAIT_CLOCK() while (!(HWREG(SYSCTL_PRTIMER) & (1 << 4)))
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#elif TIVA_ST_TIMER_NUMBER == 5
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#define ST_HANDLER TIVA_GPT5A_HANDLER
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#define ST_NUMBER TIVA_GPT5A_NUMBER
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#define ST_ENABLE_CLOCK() (HWREG(SYSCTL_RCGCTIMER) |= (1 << 5))
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#define ST_WAIT_CLOCK() while (!(HWREG(SYSCTL_PRTIMER) & (1 << 5)))
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#else
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#error "TIVA_ST_USE_TIMER specifies an unsupported timer"
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#endif
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#if (TIVA_SYSCLK / OSAL_ST_FREQUENCY) - 1 > 0xFF
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#error "the selected ST frequency is not obtainable because TIM timer prescaler limits"
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#endif
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#endif
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#if TIVA_SYSCLK % OSAL_ST_FREQUENCY != 0
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#error "the selected ST frequency is not obtainable because integer rounding"
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#endif
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#endif
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/*===========================================================================*/
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/* Driver exported variables. */
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/*===========================================================================*/
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/*===========================================================================*/
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/* Driver local types. */
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/*===========================================================================*/
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/*===========================================================================*/
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/* Driver local variables and types. */
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/*===========================================================================*/
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/*===========================================================================*/
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/* Driver local functions. */
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/*===========================================================================*/
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/*===========================================================================*/
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/* Driver interrupt handlers. */
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/*===========================================================================*/
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#if (OSAL_ST_MODE == OSAL_ST_MODE_PERIODIC) || defined(__DOXYGEN__)
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/**
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* @brief System Timer vector.
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* @details This interrupt is used for system tick in periodic mode.
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*
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* @isr
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*/
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OSAL_IRQ_HANDLER(SysTick_Handler)
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{
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OSAL_IRQ_PROLOGUE();
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osalSysLockFromISR();
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osalOsTimerHandlerI();
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osalSysUnlockFromISR();
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OSAL_IRQ_EPILOGUE();
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}
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#endif /* OSAL_ST_MODE == OSAL_ST_MODE_PERIODIC */
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#if (OSAL_ST_MODE == OSAL_ST_MODE_FREERUNNING) || defined(__DOXYGEN__)
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/**
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* @brief GPT interrupt handler.
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* @details This interrupt is used for system tick in free running mode.
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*
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* @isr
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*/
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OSAL_IRQ_HANDLER(ST_HANDLER)
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{
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uint32_t mis;
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OSAL_IRQ_PROLOGUE();
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mis = HWREG(TIVA_ST_TIM + TIMER_O_MIS);
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HWREG(TIVA_ST_TIM + TIMER_O_ICR) = mis;
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if (mis & TIMER_IMR_TAMIM) {
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osalSysLockFromISR();
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osalOsTimerHandlerI();
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osalSysUnlockFromISR();
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}
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OSAL_IRQ_EPILOGUE();
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}
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#endif /* OSAL_ST_MODE == OSAL_ST_MODE_FREERUNNING */
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/*===========================================================================*/
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/* Driver exported functions. */
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/*===========================================================================*/
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/**
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* @brief Low level ST driver initialization.
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*
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* @notapi
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*/
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void st_lld_init(void)
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{
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#if OSAL_ST_MODE == OSAL_ST_MODE_FREERUNNING
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/* Free running counter mode.*/
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/* Enabling timer clock.*/
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ST_ENABLE_CLOCK();
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/* Wait until timer peripheral is ready */
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ST_WAIT_CLOCK();
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/* Initializing the counter in free running down mode.*/
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HWREG(TIVA_ST_TIM + TIMER_O_CTL) = 0;
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HWREG(TIVA_ST_TIM + TIMER_O_CFG) = TIMER_CFG_16_BIT; /* Timer split mode */
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HWREG(TIVA_ST_TIM + TIMER_O_TAMR) = (
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TIMER_TAMR_TAMR_PERIOD | /* Periodic mode */
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TIMER_TAMR_TAMIE | /* Match interrupt enable */
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TIMER_TAMR_TASNAPS); /* Snapshot mode */
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HWREG(TIVA_ST_TIM + TIMER_O_TAPR) = (TIVA_SYSCLK / OSAL_ST_FREQUENCY) - 1;
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HWREG(TIVA_ST_TIM + TIMER_O_CTL) = (
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TIMER_CTL_TAEN | /* Timer A enable */
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TIMER_CTL_TASTALL); /* Timer A stall when paused */
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/* IRQ enabled.*/
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nvicEnableVector(ST_NUMBER, TIVA_ST_IRQ_PRIORITY);
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#endif /* OSAL_ST_MODE == OSAL_ST_MODE_FREERUNNING */
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#if OSAL_ST_MODE == OSAL_ST_MODE_PERIODIC
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/* Periodic systick mode, the Cortex-Mx internal systick timer is used
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in this mode.*/
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SysTick->LOAD = (TIVA_SYSCLK / OSAL_ST_FREQUENCY) - 1;
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SysTick->VAL = 0;
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SysTick->CTRL = SysTick_CTRL_CLKSOURCE_Msk |
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SysTick_CTRL_ENABLE_Msk |
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SysTick_CTRL_TICKINT_Msk;
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/* IRQ enabled.*/
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nvicSetSystemHandlerPriority(HANDLER_SYSTICK, TIVA_ST_IRQ_PRIORITY);
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#endif /* OSAL_ST_MODE == OSAL_ST_MODE_PERIODIC */
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}
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#endif /* OSAL_ST_MODE != OSAL_ST_MODE_NONE */
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/**
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* @}
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*/
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