1 /** 2 ****************************************************************************** 3 * @file stm32l4xx_hal_timebase_tim_template.c 4 * @author MCD Application Team 5 * @brief HAL time base based on the hardware TIM Template. 6 * 7 * This file overrides the native HAL time base functions (defined as weak) 8 * the TIM time base: 9 * + Initializes the TIM peripheral to 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 'stm32l4xx_hal_timebase_tim.c' 30 (#) Add this file and the TIM HAL driver files to your project and make sure 31 HAL_TIM_MODULE_ENABLED is defined in stm32l4xx_hal_conf.h 32 33 [..] 34 (@) The application needs to ensure that the time base is always set to 1 millisecond 35 to have correct HAL operation. 36 37 @endverbatim 38 ****************************************************************************** 39 */ 40 41 /* Includes ------------------------------------------------------------------*/ 42 #include "stm32l4xx_hal.h" 43 44 /** @addtogroup STM32L4xx_HAL_Driver 45 * @{ 46 */ 47 48 /** @addtogroup HAL_TimeBase 49 * @{ 50 */ 51 52 /* Private typedef -----------------------------------------------------------*/ 53 /* Private define ------------------------------------------------------------*/ 54 /* Private macro -------------------------------------------------------------*/ 55 /* Private variables ---------------------------------------------------------*/ 56 TIM_HandleTypeDef TimHandle; 57 /* Private function prototypes -----------------------------------------------*/ 58 void TIM6_DAC_IRQHandler(void); 59 /* Private functions ---------------------------------------------------------*/ 60 61 /** 62 * @brief This function configures the TIM6 as a time base source. 63 * The time source is configured to have 1ms time base with a dedicated 64 * Tick interrupt priority. 65 * @note This function is called automatically at the beginning of program after 66 * reset by HAL_Init() or at any time when clock is configured, by HAL_RCC_ClockConfig(). 67 * @param TickPriority Tick interrupt priority. 68 * @retval HAL status 69 */ HAL_InitTick(uint32_t TickPriority)70HAL_StatusTypeDef HAL_InitTick(uint32_t TickPriority) 71 { 72 RCC_ClkInitTypeDef clkconfig; 73 uint32_t uwTimclock, uwAPB1Prescaler; 74 uint32_t uwPrescalerValue; 75 uint32_t pFLatency; 76 HAL_StatusTypeDef status = HAL_OK; 77 78 /* Check uwTickFreq for MisraC 2012 (even if uwTickFreq is a enum type that don't take the value zero)*/ 79 if ((uint32_t)uwTickFreq != 0U) 80 { 81 /* Enable TIM6 clock */ 82 __HAL_RCC_TIM6_CLK_ENABLE(); 83 84 /* Get clock configuration */ 85 HAL_RCC_GetClockConfig(&clkconfig, &pFLatency); 86 87 /* Get APB1 prescaler */ 88 uwAPB1Prescaler = clkconfig.APB1CLKDivider; 89 90 /* Compute TIM6 clock */ 91 if (uwAPB1Prescaler == RCC_HCLK_DIV1) 92 { 93 uwTimclock = HAL_RCC_GetPCLK1Freq(); 94 } 95 else 96 { 97 uwTimclock = 2U * HAL_RCC_GetPCLK1Freq(); 98 } 99 100 /* Compute the prescaler value to have TIM6 counter clock equal to 1MHz */ 101 uwPrescalerValue = (uint32_t) ((uwTimclock / 1000000U) - 1U); 102 103 /* Initialize TIM6 */ 104 TimHandle.Instance = TIM6; 105 106 /* Initialize TIMx peripheral as follows: 107 + Period = [(TIM6CLK/1000) - 1]. to have a (1/1000) s time base. 108 + Prescaler = (uwTimclock/1000000 - 1) to have a 1MHz counter clock. 109 + ClockDivision = 0 110 + Counter direction = Up 111 */ 112 TimHandle.Init.Period = (1000000U / 1000U) - 1U; 113 TimHandle.Init.Prescaler = uwPrescalerValue; 114 TimHandle.Init.ClockDivision = 0; 115 TimHandle.Init.CounterMode = TIM_COUNTERMODE_UP; 116 TimHandle.Init.AutoReloadPreload = TIM_AUTORELOAD_PRELOAD_DISABLE; 117 if (HAL_TIM_Base_Init(&TimHandle) == HAL_OK) 118 { 119 /* Start the TIM time Base generation in interrupt mode */ 120 if (HAL_TIM_Base_Start_IT(&TimHandle) == HAL_OK) 121 { 122 /* Enable the TIM6_DAC global Interrupt */ 123 HAL_NVIC_EnableIRQ(TIM6_DAC_IRQn); 124 125 /* Configure the SysTick IRQ priority */ 126 if (TickPriority < (1UL << __NVIC_PRIO_BITS)) 127 { 128 /*Configure the TIM6_DAC IRQ priority */ 129 HAL_NVIC_SetPriority(TIM6_DAC_IRQn, TickPriority ,0U); 130 uwTickPrio = TickPriority; 131 } 132 else 133 { 134 status = HAL_ERROR; 135 } 136 } 137 else 138 { 139 status = HAL_ERROR; 140 } 141 } 142 else 143 { 144 status = HAL_ERROR; 145 } 146 } 147 else 148 { 149 status = HAL_ERROR; 150 } 151 152 /* Return function status */ 153 return status; 154 } 155 156 /** 157 * @brief Suspend Tick increment. 158 * @note Disable the tick increment by disabling TIM6 update interrupt. 159 * @retval None 160 */ HAL_SuspendTick(void)161void HAL_SuspendTick(void) 162 { 163 /* Disable TIM6 update interrupt */ 164 __HAL_TIM_DISABLE_IT(&TimHandle, TIM_IT_UPDATE); 165 } 166 167 /** 168 * @brief Resume Tick increment. 169 * @note Enable the tick increment by enabling TIM6 update interrupt. 170 * @retval None 171 */ HAL_ResumeTick(void)172void HAL_ResumeTick(void) 173 { 174 /* Enable TIM6 update interrupt */ 175 __HAL_TIM_ENABLE_IT(&TimHandle, TIM_IT_UPDATE); 176 } 177 178 /** 179 * @brief Period elapsed callback in non blocking mode 180 * @note This function is called when TIM6 interrupt took place, inside 181 * HAL_TIM_IRQHandler(). It makes a direct call to HAL_IncTick() to increment 182 * a global variable "uwTick" used as application time base. 183 * @param htim TIM handle 184 * @retval None 185 */ HAL_TIM_PeriodElapsedCallback(TIM_HandleTypeDef * htim)186void HAL_TIM_PeriodElapsedCallback(TIM_HandleTypeDef *htim) 187 { 188 /* Prevent unused argument(s) compilation warning */ 189 UNUSED(htim); 190 191 HAL_IncTick(); 192 } 193 194 /** 195 * @brief This function handles TIM interrupt request. 196 * @retval None 197 */ TIM6_DAC_IRQHandler(void)198void TIM6_DAC_IRQHandler(void) 199 { 200 HAL_TIM_IRQHandler(&TimHandle); 201 } 202 203 /** 204 * @} 205 */ 206 207 /** 208 * @} 209 */ 210
