FreeRTOS_Timers
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Outline
Includes
#include "stm32f4xx_hal.h"
TimHandle
HAL_InitTick(uint32_t)
HAL_SuspendTick()
HAL_ResumeTick()
HAL_TIM_PeriodElapsedCallback(TIM_HandleTypeDef *)
TIM6_DAC_IRQHandler()
Files
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SourceVuSTM32 Libraries and SamplesFreeRTOS_TimersSrc/stm32f4xx_hal_timebase_tim.c
 
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/** ****************************************************************************** * @file stm32f4xx_hal_timebase_tim.c * @author MCD Application Team * @brief HAL time base based on the hardware TIM. * * This file override the native HAL time base functions (defined as weak) * the TIM time base: * + Initializes the TIM peripheral generate a Period elapsed Event each 1ms * + HAL_IncTick is called inside HAL_TIM_PeriodElapsedCallback ie each 1ms * ****************************************************************************** * @attention * * Copyright (c) 2017 STMicroelectronics. * All rights reserved. * * This software is licensed under terms that can be found in the LICENSE file * in the root directory of this software component. * If no LICENSE file comes with this software, it is provided AS-IS. * ****************************************************************************** *//* ... */ /* Includes ------------------------------------------------------------------*/ #include "stm32f4xx_hal.h" Includes /* Private typedef -----------------------------------------------------------*/ /* Private define ------------------------------------------------------------*/ /* Private macro -------------------------------------------------------------*/ /* Private variables ---------------------------------------------------------*/ TIM_HandleTypeDef TimHandle; /* Private function prototypes -----------------------------------------------*/ void TIM6_DAC_IRQHandler(void); /* Private functions ---------------------------------------------------------*/ /** * @brief This function configures the TIM6 as a time base source. * The time source is configured to have 1ms time base with a dedicated * Tick interrupt priority. * @note This function is called automatically at the beginning of program after * reset by HAL_Init() or at any time when clock is configured, by HAL_RCC_ClockConfig(). * @param TickPriority: Tick interrupt priority. * @retval HAL status *//* ... */ HAL_StatusTypeDef HAL_InitTick (uint32_t TickPriority) { RCC_ClkInitTypeDef clkconfig; uint32_t uwTimclock, uwAPB1Prescaler = 0U; uint32_t uwPrescalerValue = 0U; uint32_t pFLatency; /*Configure the TIM6 IRQ priority */ HAL_NVIC_SetPriority(TIM6_DAC_IRQn, TickPriority ,0U); /* Enable the TIM6 global Interrupt */ HAL_NVIC_EnableIRQ(TIM6_DAC_IRQn); /* Enable TIM6 clock */ __HAL_RCC_TIM6_CLK_ENABLE(); /* Get clock configuration */ HAL_RCC_GetClockConfig(&clkconfig, &pFLatency); /* Get APB1 prescaler */ uwAPB1Prescaler = clkconfig.APB1CLKDivider; /* Compute TIM6 clock */ if (uwAPB1Prescaler == RCC_HCLK_DIV1) { uwTimclock = HAL_RCC_GetPCLK1Freq(); }if (uwAPB1Prescaler == RCC_HCLK_DIV1) { ... } else { uwTimclock = 2*HAL_RCC_GetPCLK1Freq(); }else { ... } /* Compute the prescaler value to have TIM6 counter clock equal to 1MHz */ uwPrescalerValue = (uint32_t) ((uwTimclock / 1000000U) - 1U); /* Initialize TIM6 */ TimHandle.Instance = TIM6; /* Initialize TIMx peripheral as follow: + Period = [(TIM6CLK/1000) - 1]. to have a (1/1000) s time base. + Prescaler = (uwTimclock/1000000 - 1) to have a 1MHz counter clock. + ClockDivision = 0 + Counter direction = Up *//* ... */ TimHandle.Init.Period = (1000000U / 1000U) - 1U; TimHandle.Init.Prescaler = uwPrescalerValue; TimHandle.Init.ClockDivision = 0; TimHandle.Init.CounterMode = TIM_COUNTERMODE_UP; TimHandle.Init.AutoReloadPreload = TIM_AUTORELOAD_PRELOAD_DISABLE; if(HAL_TIM_Base_Init(&TimHandle) == HAL_OK) { /* Start the TIM time Base generation in interrupt mode */ return HAL_TIM_Base_Start_IT(&TimHandle); }if (HAL_TIM_Base_Init(&TimHandle) == HAL_OK) { ... } /* Return function status */ return HAL_ERROR; }{ ... } /** * @brief Suspend Tick increment. * @note Disable the tick increment by disabling TIM6 update interrupt. * @param None * @retval None *//* ... */ void HAL_SuspendTick(void) { /* Disable TIM6 update Interrupt */ __HAL_TIM_DISABLE_IT(&TimHandle, TIM_IT_UPDATE); }{ ... } /** * @brief Resume Tick increment. * @note Enable the tick increment by Enabling TIM6 update interrupt. * @param None * @retval None *//* ... */ void HAL_ResumeTick(void) { /* Enable TIM6 Update interrupt */ __HAL_TIM_ENABLE_IT(&TimHandle, TIM_IT_UPDATE); }{ ... } /** * @brief Period elapsed callback in non blocking mode * @note This function is called when TIM6 interrupt took place, inside * HAL_TIM_IRQHandler(). It makes a direct call to HAL_IncTick() to increment * a global variable "uwTick" used as application time base. * @param htim : TIM handle * @retval None *//* ... */ void HAL_TIM_PeriodElapsedCallback(TIM_HandleTypeDef *htim) { HAL_IncTick(); }{ ... } /** * @brief This function handles TIM interrupt request. * @param None * @retval None *//* ... */ void TIM6_DAC_IRQHandler(void) { HAL_TIM_IRQHandler(&TimHandle); }{ ... }
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