162 lines
5.1 KiB
C
162 lines
5.1 KiB
C
/*
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ChibiOS/RT - Copyright (C) 2006-2013 Giovanni Di Sirio
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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 STM32/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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/* The following checks and settings are unusually done here because the
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file st.h needs to not have external dependencies. In this case there
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would be a dependency on osal.h and mcuconf.h.*/
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#if (OSAL_ST_MODE == OSAL_ST_MODE_FREERUNNING) && !STM32_HAS_TIM2
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#error "TIM2 not present in the selected device"
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#endif
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#if (OSAL_ST_MODE == OSAL_ST_MODE_FREERUNNING) && !STM32_TIM2_IS_32BITS
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#error "TIM2 is not a 32 bits timer"
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#endif
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/**
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* @name Configuration options
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* @{
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*/
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/**
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* @brief SysTick timer IRQ priority.
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*/
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#if !defined(STM32_ST_IRQ_PRIORITY) || defined(__DOXYGEN__)
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#define STM32_ST_IRQ_PRIORITY 8
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#endif
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/** @} */
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/*===========================================================================*/
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/* Driver local definitions. */
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/*===========================================================================*/
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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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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
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#if (OSAL_ST_MODE == OSAL_ST_MODE_FREERUNNING) || defined(__DOXYGEN__)
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/**
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* @brief TIM2 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(STM32_TIM2_HANDLER) {
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OSAL_IRQ_PROLOGUE();
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STM32_TIM2->SR = 0;
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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
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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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#if OSAL_ST_MODE == OSAL_ST_MODE_FREERUNNING
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/* Free running counter mode.*/
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rccEnableTIM2(FALSE);
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/* Initializing the counter in free running mode.*/
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STM32_TIM2->PSC = STM32_TIMCLK1 / OSAL_SYSTICK_FREQUENCY - 1;
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STM32_TIM2->ARR = 0xFFFFFFFF;
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STM32_TIM2->CCMR1 = 0;
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STM32_TIM2->CCR[0] = 0;
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STM32_TIM2->DIER = 0;
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STM32_TIM2->CR2 = 0;
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STM32_TIM2->EGR = TIM_EGR_UG;
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STM32_TIM2->CR1 = TIM_CR1_CEN;
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/* IRQ enabled.*/
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nvicEnableVector(STM32_TIM2_NUMBER, STM32_ST_IRQ_PRIORITY);
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#endif
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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 = STM32_HCLK / OSAL_SYSTICK_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(SysTick_IRQn, STM32_ST_IRQ_PRIORITY);
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#endif
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}
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#endif /* OSAL_ST_MODE != OSAL_ST_MODE_NONE */
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/** @} */
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