1 /** 2 ****************************************************************************** 3 * @file stm32h7xx_hal_timebase_tim_template.c 4 * @author MCD Application Team 5 * @brief HAL time base based on the hardware TIM. 6 * 7 * This file overrides the native HAL time base functions (defined as weak) 8 * the TIM time base: 9 * + Initializes the TIM peripheral generate a Period elapsed Event each 1ms 10 * + HAL_IncTick is called inside HAL_TIM_PeriodElapsedCallback ie each 1ms 11 * 12 ****************************************************************************** 13 * @attention 14 * 15 * Copyright (c) 2017 STMicroelectronics. 16 * All rights reserved. 17 * 18 * This software is licensed under terms that can be found in the LICENSE file 19 * in the root directory of this software component. 20 * If no LICENSE file comes with this software, it is provided AS-IS. 21 * 22 ****************************************************************************** 23 @verbatim 24 ============================================================================== 25 ##### How to use this driver ##### 26 ============================================================================== 27 [..] 28 This file must be copied to the application folder and modified as follows: 29 (#) Rename it to 'stm32h7xx_hal_timebase_tim.c' 30 (#) Add this file and the TIM HAL drivers to your project and uncomment 31 HAL_TIM_MODULE_ENABLED define in stm32h7xx_hal_conf.h 32 33 @endverbatim 34 ****************************************************************************** 35 */ 36 37 /* Includes ------------------------------------------------------------------*/ 38 #include "stm32h7xx_hal.h" 39 40 /* Private typedef -----------------------------------------------------------*/ 41 /* Private define ------------------------------------------------------------*/ 42 /* Private macro -------------------------------------------------------------*/ 43 /* Private variables ---------------------------------------------------------*/ 44 static TIM_HandleTypeDef TimHandle; 45 /* Private function prototypes -----------------------------------------------*/ 46 void TIM6_DAC_IRQHandler(void); 47 /* Private functions ---------------------------------------------------------*/ 48 49 /** 50 * @brief This function configures the TIM6 as a time base source. 51 * The time source is configured to have 1ms time base with a dedicated 52 * Tick interrupt priority. 53 * @note This function is called automatically at the beginning of program after 54 * reset by HAL_Init() or at any time when clock is configured, by HAL_RCC_ClockConfig(). 55 * @param TickPriority Tick interrupt priority. 56 * @retval HAL status 57 */ HAL_InitTick(uint32_t TickPriority)58HAL_StatusTypeDef HAL_InitTick (uint32_t TickPriority) 59 { 60 RCC_ClkInitTypeDef clkconfig; 61 uint32_t uwTimclock, uwAPB1Prescaler; 62 uint32_t uwPrescalerValue; 63 uint32_t pFLatency; 64 HAL_StatusTypeDef status; 65 66 /* Enable TIM6 clock */ 67 __HAL_RCC_TIM6_CLK_ENABLE(); 68 69 /* Get clock configuration */ 70 HAL_RCC_GetClockConfig(&clkconfig, &pFLatency); 71 72 /* Get APB1 prescaler */ 73 uwAPB1Prescaler = clkconfig.APB1CLKDivider; 74 75 /* Compute TIM6 clock */ 76 if (uwAPB1Prescaler == RCC_HCLK_DIV1) 77 { 78 uwTimclock = HAL_RCC_GetPCLK1Freq(); 79 } 80 else 81 { 82 uwTimclock = 2UL * HAL_RCC_GetPCLK1Freq(); 83 } 84 85 /* Compute the prescaler value to have TIM6 counter clock equal to 1MHz */ 86 uwPrescalerValue = (uint32_t) ((uwTimclock / 1000000U) - 1U); 87 88 /* Initialize TIM6 */ 89 TimHandle.Instance = TIM6; 90 91 /* Initialize TIMx peripheral as follow: 92 + Period = [(TIM6CLK/1000) - 1]. to have a (1/1000) s time base. 93 + Prescaler = (uwTimclock/1000000 - 1) to have a 1MHz counter clock. 94 + ClockDivision = 0 95 + Counter direction = Up 96 */ 97 TimHandle.Init.Period = (1000000U / 1000U) - 1U; 98 TimHandle.Init.Prescaler = uwPrescalerValue; 99 TimHandle.Init.ClockDivision = 0U; 100 TimHandle.Init.CounterMode = TIM_COUNTERMODE_UP; 101 status = HAL_TIM_Base_Init(&TimHandle); 102 if (status == HAL_OK) 103 { 104 /* Start the TIM time Base generation in interrupt mode */ 105 status = HAL_TIM_Base_Start_IT(&TimHandle); 106 if (status == HAL_OK) 107 { 108 /* Enable the TIM6 global Interrupt */ 109 HAL_NVIC_EnableIRQ(TIM6_DAC_IRQn); 110 111 if (TickPriority < (1UL << __NVIC_PRIO_BITS)) 112 { 113 /* Enable the TIM6 global Interrupt */ 114 HAL_NVIC_SetPriority(TIM6_DAC_IRQn, TickPriority, 0); 115 uwTickPrio = TickPriority; 116 } 117 else 118 { 119 status = HAL_ERROR; 120 } 121 } 122 } 123 124 /* Return function status */ 125 return status; 126 } 127 128 /** 129 * @brief Suspend Tick increment. 130 * @note Disable the tick increment by disabling TIM6 update interrupt. 131 * @param None 132 * @retval None 133 */ HAL_SuspendTick(void)134void HAL_SuspendTick(void) 135 { 136 /* Disable TIM6 update Interrupt */ 137 __HAL_TIM_DISABLE_IT(&TimHandle, TIM_IT_UPDATE); 138 } 139 140 /** 141 * @brief Resume Tick increment. 142 * @note Enable the tick increment by Enabling TIM6 update interrupt. 143 * @param None 144 * @retval None 145 */ HAL_ResumeTick(void)146void HAL_ResumeTick(void) 147 { 148 /* Enable TIM6 Update interrupt */ 149 __HAL_TIM_ENABLE_IT(&TimHandle, TIM_IT_UPDATE); 150 } 151 152 /** 153 * @brief Period elapsed callback in non blocking mode 154 * @note This function is called when TIM6 interrupt took place, inside 155 * HAL_TIM_IRQHandler(). It makes a direct call to HAL_IncTick() to increment 156 * a global variable "uwTick" used as application time base. 157 * @param htim TIM handle 158 * @retval None 159 */ HAL_TIM_PeriodElapsedCallback(TIM_HandleTypeDef * htim)160void HAL_TIM_PeriodElapsedCallback(TIM_HandleTypeDef *htim) 161 { 162 /* Prevent unused argument(s) compilation warning */ 163 UNUSED(htim); 164 165 HAL_IncTick(); 166 } 167 168 /** 169 * @brief This function handles TIM interrupt request. 170 * @param None 171 * @retval None 172 */ TIM6_DAC_IRQHandler(void)173void TIM6_DAC_IRQHandler(void) 174 { 175 HAL_TIM_IRQHandler(&TimHandle); 176 } 177 178
