1 /** 2 ****************************************************************************** 3 * @file stm32g0xx_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) 2018 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 'stm32g0xx_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 stm32g0xx_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 "stm32g0xx_hal.h" 43 44 /** @addtogroup STM32G0xx_HAL_Driver 45 * @{ 46 */ 47 48 /** @addtogroup HAL_TimeBase_TIM 49 * @{ 50 */ 51 52 /* Private typedef -----------------------------------------------------------*/ 53 /* Private define ------------------------------------------------------------*/ 54 /* Private macro -------------------------------------------------------------*/ 55 /* Private variables ---------------------------------------------------------*/ 56 TIM_HandleTypeDef TimHandle = {.Init = {0}}; 57 58 /* Private function prototypes -----------------------------------------------*/ 59 void TIM14_IRQHandler(void); 60 /* Private functions ---------------------------------------------------------*/ 61 62 /** 63 * @brief This function configures the TIM14 as a time base source. 64 * The time source is configured to have 1ms time base with a dedicated 65 * Tick interrupt priority. 66 * @note This function is called automatically at the beginning of program 67 * after reset by HAL_Init() or at any time when clock is configured, 68 * by HAL_RCC_ClockConfig(). 69 * @param TickPriority Tick interrupt priority. 70 * @retval HAL status 71 */ HAL_InitTick(uint32_t TickPriority)72HAL_StatusTypeDef HAL_InitTick(uint32_t TickPriority) 73 { 74 RCC_ClkInitTypeDef clkconfig; 75 uint32_t uwTimclock; 76 uint32_t uwAPB1Prescaler; 77 uint32_t uwPrescalerValue; 78 uint32_t pFLatency; 79 HAL_StatusTypeDef status = HAL_OK; 80 81 /* Check uwTickFreq for MisraC 2012 (even if uwTickFreq is a enum type that don't take the value zero)*/ 82 if ((uint32_t)uwTickFreq != 0U) 83 { 84 /* Enable TIM14 clock */ 85 __HAL_RCC_TIM14_CLK_ENABLE(); 86 87 /* Get clock configuration */ 88 HAL_RCC_GetClockConfig(&clkconfig, &pFLatency); 89 90 /* Get APB1 prescaler */ 91 uwAPB1Prescaler = clkconfig.APB1CLKDivider; 92 93 /* Compute TIM14 clock */ 94 if (uwAPB1Prescaler == RCC_HCLK_DIV1) 95 { 96 uwTimclock = HAL_RCC_GetPCLK1Freq(); 97 } 98 else 99 { 100 uwTimclock = 2U*HAL_RCC_GetPCLK1Freq(); 101 } 102 103 /* Compute the prescaler value to have TIM14 counter clock equal to 1MHz */ 104 uwPrescalerValue = (uint32_t)((uwTimclock / 1000000U) - 1U); 105 106 /* Initialize TIM14 */ 107 TimHandle.Instance = TIM14; 108 109 /* Initialize TIMx peripheral as follow: 110 + Period = [(TIM14CLK/uwTickFreq) - 1]. to have a (1/uwTickFreq) s time base. 111 + Prescaler = (uwTimclock/1000000 - 1) to have a 1MHz counter clock. 112 + ClockDivision = 0 113 + Counter direction = Up 114 */ 115 TimHandle.Init.Period = (1000000U / (1000U / (uint32_t)uwTickFreq)) - 1U; 116 TimHandle.Init.Prescaler = uwPrescalerValue; 117 TimHandle.Init.ClockDivision = 0U; 118 TimHandle.Init.CounterMode = TIM_COUNTERMODE_UP; 119 TimHandle.Init.AutoReloadPreload = TIM_AUTORELOAD_PRELOAD_DISABLE; 120 if (HAL_TIM_Base_Init(&TimHandle) == HAL_OK) 121 { 122 /* Start the TIM time Base generation in interrupt mode */ 123 if (HAL_TIM_Base_Start_IT(&TimHandle) == HAL_OK) 124 { 125 /* Enable the TIM14 global Interrupt */ 126 HAL_NVIC_EnableIRQ(TIM14_IRQn); 127 128 /* Configure the SysTick IRQ priority */ 129 if (TickPriority < (1UL << __NVIC_PRIO_BITS)) 130 { 131 /*Configure the TIM14 IRQ priority */ 132 HAL_NVIC_SetPriority(TIM14_IRQn, TickPriority,0U); 133 uwTickPrio = TickPriority; 134 } 135 else 136 { 137 status = HAL_ERROR; 138 } 139 } 140 else 141 { 142 status = HAL_ERROR; 143 } 144 } 145 else 146 { 147 status = HAL_ERROR; 148 } 149 } 150 else 151 { 152 status = HAL_ERROR; 153 } 154 155 /* Return function status */ 156 return status; 157 } 158 159 /** 160 * @brief Suspend Tick increment. 161 * @note Disable the tick increment by disabling TIM14 update interrupt. 162 * @retval None 163 */ HAL_SuspendTick(void)164void HAL_SuspendTick(void) 165 { 166 /* Disable TIM14 update interrupt */ 167 __HAL_TIM_DISABLE_IT(&TimHandle, TIM_IT_UPDATE); 168 } 169 170 /** 171 * @brief Resume Tick increment. 172 * @note Enable the tick increment by enabling TIM14 update interrupt. 173 * @retval None 174 */ HAL_ResumeTick(void)175void HAL_ResumeTick(void) 176 { 177 /* Enable TIM14 update interrupt */ 178 __HAL_TIM_ENABLE_IT(&TimHandle, TIM_IT_UPDATE); 179 } 180 181 /** 182 * @brief Period elapsed callback in non blocking mode 183 * @note This function is called when TIM14 interrupt took place, inside 184 * HAL_TIM_IRQHandler(). It makes a direct call to HAL_IncTick() to increment 185 * a global variable "uwTick" used as application time base. 186 * @param htim TIM handle 187 * @retval None 188 */ HAL_TIM_PeriodElapsedCallback(TIM_HandleTypeDef * htim)189void HAL_TIM_PeriodElapsedCallback(TIM_HandleTypeDef *htim) 190 { 191 HAL_IncTick(); 192 } 193 194 /** 195 * @brief This function handles TIM interrupt request. 196 * @retval None 197 */ TIM14_IRQHandler(void)198void TIM14_IRQHandler(void) 199 { 200 HAL_TIM_IRQHandler(&TimHandle); 201 } 202 203 /** 204 * @} 205 */ 206 207 /** 208 * @} 209 */ 210 211
