160 lines
6.0 KiB
C
160 lines
6.0 KiB
C
/**
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******************************************************************************
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* @file stm32h7xx_hal_timebase_tim.c
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* @author MCD Application Team
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* @brief HAL time base based on the hardware TIM.
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*
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* This file overrides the native HAL time base functions (defined as
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*weak) the TIM time base:
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* + Intializes the TIM peripheral generate a Period elapsed Event
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*each 1ms
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* + HAL_IncTick is called inside HAL_TIM_PeriodElapsedCallback ie
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*each 1ms
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*
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******************************************************************************
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* @attention
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*
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* <h2><center>© COPYRIGHT(c) 2017 STMicroelectronics</center></h2>
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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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* 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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* 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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* 3. Neither the name of STMicroelectronics nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* 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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******************************************************************************
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*/
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/* Includes ------------------------------------------------------------------*/
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#include "stm32h7xx_hal.h"
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/* Private typedef -----------------------------------------------------------*/
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/* Private define ------------------------------------------------------------*/
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/* Private macro -------------------------------------------------------------*/
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/* Private variables ---------------------------------------------------------*/
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TIM_HandleTypeDef TimHandle;
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/* Private function prototypes -----------------------------------------------*/
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void TIM6_DAC_IRQHandler(void);
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/* Private functions ---------------------------------------------------------*/
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/**
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* @brief This function configures the TIM6 as a time base source.
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* The time source is configured to have 1ms time base with a dedicated
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* Tick interrupt priority.
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* @note This function is called automatically at the beginning of program
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* after reset by HAL_Init() or at any time when clock is configured, by
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* HAL_RCC_ClockConfig().
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* @param TickPriority: Tick interrupt priority.
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* @retval HAL status
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*/
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HAL_StatusTypeDef HAL_InitTick(uint32_t TickPriority) {
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RCC_ClkInitTypeDef clkconfig;
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uint32_t uwTimclock, uwAPB1Prescaler = 0U;
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uint32_t uwPrescalerValue = 0U;
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uint32_t pFLatency;
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/*Configure the TIM6 IRQ priority */
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HAL_NVIC_SetPriority(TIM6_DAC_IRQn, TickPriority, 0U);
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/* Enable the TIM6 global Interrupt */
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HAL_NVIC_EnableIRQ(TIM6_DAC_IRQn);
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/* Enable TIM6 clock */
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__HAL_RCC_TIM6_CLK_ENABLE();
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/* Get clock configuration */
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HAL_RCC_GetClockConfig(&clkconfig, &pFLatency);
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/* Get APB1 prescaler */
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uwAPB1Prescaler = clkconfig.APB1CLKDivider;
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/* Compute TIM6 clock */
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if (uwAPB1Prescaler == RCC_HCLK_DIV1) {
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uwTimclock = HAL_RCC_GetPCLK1Freq();
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} else {
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uwTimclock = 2 * HAL_RCC_GetPCLK1Freq();
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}
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/* Compute the prescaler value to have TIM6 counter clock equal to 1MHz */
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uwPrescalerValue = (uint32_t)((uwTimclock / 1000000U) - 1U);
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/* Initialize TIM6 */
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TimHandle.Instance = TIM6;
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/* Initialize TIMx peripheral as follow:
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+ Period = [(TIM6CLK/1000) - 1]. to have a (1/1000) s time base.
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+ Prescaler = (uwTimclock/1000000 - 1) to have a 1MHz counter clock.
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+ ClockDivision = 0
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+ Counter direction = Up
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*/
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TimHandle.Init.Period = (1000000U / 1000U) - 1U;
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TimHandle.Init.Prescaler = uwPrescalerValue;
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TimHandle.Init.ClockDivision = 0;
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TimHandle.Init.CounterMode = TIM_COUNTERMODE_UP;
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if (HAL_TIM_Base_Init(&TimHandle) == HAL_OK) {
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/* Start the TIM time Base generation in interrupt mode */
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return HAL_TIM_Base_Start_IT(&TimHandle);
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}
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/* Return function status */
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return HAL_ERROR;
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}
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/**
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* @brief Suspend Tick increment.
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* @note Disable the tick increment by disabling TIM6 update interrupt.
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* @param None
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* @retval None
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*/
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void HAL_SuspendTick(void) {
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/* Disable TIM6 update Interrupt */
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__HAL_TIM_DISABLE_IT(&TimHandle, TIM_IT_UPDATE);
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}
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/**
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* @brief Resume Tick increment.
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* @note Enable the tick increment by Enabling TIM6 update interrupt.
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* @param None
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* @retval None
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*/
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void HAL_ResumeTick(void) {
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/* Enable TIM6 Update interrupt */
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__HAL_TIM_ENABLE_IT(&TimHandle, TIM_IT_UPDATE);
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}
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/**
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* @brief Period elapsed callback in non blocking mode
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* @note This function is called when TIM6 interrupt took place, inside
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* HAL_TIM_IRQHandler(). It makes a direct call to HAL_IncTick() to increment
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* a global variable "uwTick" used as application time base.
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* @param htim : TIM handle
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* @retval None
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*/
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void HAL_TIM_PeriodElapsedCallback(TIM_HandleTypeDef *htim) { HAL_IncTick(); }
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/**
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* @brief This function handles TIM interrupt request.
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* @param None
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* @retval None
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*/
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void TIM6_DAC_IRQHandler(void) { HAL_TIM_IRQHandler(&TimHandle); }
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/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/
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