| /** |
| ****************************************************************************** |
| * @file stm32l0xx_hal_timebase_tim_template.c |
| * @author MCD Application Team |
| * @brief HAL time base based on the hardware TIM Template. |
| * |
| * This file override the native HAL time base functions (defined as weak) |
| * the TIM time base: |
| * + Initializes the TIM peripheral to generate a Period elapsed Event each 1ms |
| * + HAL_IncTick is called inside HAL_TIM_PeriodElapsedCallback ie each 1ms |
| * |
| ****************************************************************************** |
| * @attention |
| * |
| * Copyright (c) 2016 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. |
| * |
| ****************************************************************************** |
| @verbatim |
| ============================================================================== |
| ##### How to use this driver ##### |
| ============================================================================== |
| [..] |
| This file must be copied to the application folder and modified as follows: |
| (#) Rename it to 'stm32l0xx_hal_timebase_tim.c' |
| (#) Add this file and the TIM HAL driver files to your project and make sure |
| HAL_TIM_MODULE_ENABLED is defined in stm32l0xx_hal_conf.h |
| |
| [..] |
| (@) The application needs to ensure that the time base is always set to 1 millisecond |
| to have correct HAL operation. |
| |
| @endverbatim |
| ****************************************************************************** |
| */ |
| |
| /* Includes ------------------------------------------------------------------*/ |
| #include "stm32l0xx_hal.h" |
| |
| /** @addtogroup STM32L0xx_HAL_Driver |
| * @{ |
| */ |
| |
| /** @addtogroup HAL_TimeBase |
| * @{ |
| */ |
| |
| /* Private typedef -----------------------------------------------------------*/ |
| /* Private define ------------------------------------------------------------*/ |
| /* Private macro -------------------------------------------------------------*/ |
| /* Private variables ---------------------------------------------------------*/ |
| TIM_HandleTypeDef TimHandle; |
| /* Private function prototypes -----------------------------------------------*/ |
| void TIM21_IRQHandler(void); |
| /* Private functions ---------------------------------------------------------*/ |
| |
| /** |
| * @brief This function configures the TIM21 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; |
| uint32_t uwAPB2Prescaler; |
| uint32_t uwPrescalerValue; |
| uint32_t pFLatency; |
| HAL_StatusTypeDef status; |
| |
| /* Configure the TIM21 IRQ priority */ |
| HAL_NVIC_SetPriority(TIM21_IRQn, TickPriority, 0U); |
| |
| /* Enable the TIM21 global Interrupt */ |
| HAL_NVIC_EnableIRQ(TIM21_IRQn); |
| |
| /* Enable TIM21 clock */ |
| __HAL_RCC_TIM21_CLK_ENABLE(); |
| |
| /* Get clock configuration */ |
| HAL_RCC_GetClockConfig(&clkconfig, &pFLatency); |
| |
| /* Get APB2 prescaler */ |
| uwAPB2Prescaler = clkconfig.APB2CLKDivider; |
| |
| /* Compute TIM21 clock */ |
| if (uwAPB2Prescaler == RCC_HCLK_DIV1) |
| { |
| uwTimclock = HAL_RCC_GetPCLK2Freq(); |
| } |
| else |
| { |
| uwTimclock = 2U * HAL_RCC_GetPCLK2Freq(); |
| } |
| |
| /* Compute the prescaler value to have TIM21 counter clock equal to 1MHz */ |
| uwPrescalerValue = (uint32_t)((uwTimclock / 1000000U) - 1U); |
| |
| /* Initialize TIM21 */ |
| TimHandle.Instance = TIM21; |
| |
| /* Initialize TIMx peripheral as follow: |
| + Period = [(TIM21CLK/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; |
| status = HAL_TIM_Base_Init(&TimHandle); |
| if (status == HAL_OK) |
| { |
| /* Start the TIM time Base generation in interrupt mode */ |
| status = HAL_TIM_Base_Start_IT(&TimHandle); |
| if (status == HAL_OK) |
| { |
| /* Configure the SysTick IRQ priority */ |
| if (TickPriority < (1UL << __NVIC_PRIO_BITS)) |
| { |
| /* Configure the TIM IRQ priority */ |
| HAL_NVIC_SetPriority(TIM21_IRQn, TickPriority, 0U); |
| uwTickPrio = TickPriority; |
| } |
| else |
| { |
| status = HAL_ERROR; |
| } |
| } |
| } |
| |
| /* Return function status */ |
| return status; |
| } |
| |
| /** |
| * @brief Suspend Tick increment. |
| * @note Disable the tick increment by disabling TIM21 update interrupt. |
| * @param None |
| * @retval None |
| */ |
| void HAL_SuspendTick(void) |
| { |
| /* Disable TIM21 update interrupt */ |
| __HAL_TIM_DISABLE_IT(&TimHandle, TIM_IT_UPDATE); |
| } |
| |
| /** |
| * @brief Resume Tick increment. |
| * @note Enable the tick increment by enabling TIM21 update interrupt. |
| * @param None |
| * @retval None |
| */ |
| void HAL_ResumeTick(void) |
| { |
| /* Enable TIM21 update interrupt */ |
| __HAL_TIM_ENABLE_IT(&TimHandle, TIM_IT_UPDATE); |
| } |
| |
| /** |
| * @brief Period elapsed callback in non blocking mode |
| * @note This function is called when TIM21 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 TIM21_IRQHandler(void) |
| { |
| HAL_TIM_IRQHandler(&TimHandle); |
| } |
| |
| /** |
| * @} |
| */ |
| |
| /** |
| * @} |
| */ |
| |
| |