| /** |
| ****************************************************************************** |
| * @file stm32f1xx_hal_timebase_tim_template.c |
| * @author MCD Application Team |
| * @brief HAL time base based on the hardware TIM Template. |
| * |
| * This file overrides the native HAL time base functions (defined as weak) |
| * the TIM time base: |
| * + Intializes the TIM peripheral generate a Period elapsed Event each 1ms |
| * + HAL_IncTick is called inside HAL_TIM_PeriodElapsedCallback ie each 1ms |
| * |
| ****************************************************************************** |
| * @attention |
| * |
| * <h2><center>© COPYRIGHT(c) 2017 STMicroelectronics</center></h2> |
| * |
| * Redistribution and use in source and binary forms, with or without modification, |
| * are permitted provided that the following conditions are met: |
| * 1. Redistributions of source code must retain the above copyright notice, |
| * this list of conditions and the following disclaimer. |
| * 2. Redistributions in binary form must reproduce the above copyright notice, |
| * this list of conditions and the following disclaimer in the documentation |
| * and/or other materials provided with the distribution. |
| * 3. Neither the name of STMicroelectronics nor the names of its contributors |
| * may be used to endorse or promote products derived from this software |
| * without specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" |
| * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
| * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE |
| * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR |
| * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER |
| * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, |
| * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| * |
| ****************************************************************************** |
| */ |
| |
| /* Includes ------------------------------------------------------------------*/ |
| #include "stm32f1xx_hal.h" |
| |
| /** @addtogroup STM32F1xx_HAL_Driver |
| * @{ |
| */ |
| |
| /** @addtogroup HAL_TimeBase_TIM |
| * @{ |
| */ |
| |
| /* Private typedef -----------------------------------------------------------*/ |
| /* Private define ------------------------------------------------------------*/ |
| /* Private macro -------------------------------------------------------------*/ |
| /* Private variables ---------------------------------------------------------*/ |
| TIM_HandleTypeDef TimHandle; |
| /* Private function prototypes -----------------------------------------------*/ |
| void TIM2_IRQHandler(void); |
| /* Private functions ---------------------------------------------------------*/ |
| |
| /** |
| * @brief This function configures the TIM2 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, uwAPB1Prescaler = 0U; |
| uint32_t uwPrescalerValue = 0U; |
| uint32_t pFLatency; |
| |
| /*Configure the TIM2 IRQ priority */ |
| HAL_NVIC_SetPriority(TIM2_IRQn, TickPriority, 0U); |
| |
| /* Enable the TIM2 global Interrupt */ |
| HAL_NVIC_EnableIRQ(TIM2_IRQn); |
| |
| /* Enable TIM2 clock */ |
| __HAL_RCC_TIM2_CLK_ENABLE(); |
| |
| /* Get clock configuration */ |
| HAL_RCC_GetClockConfig(&clkconfig, &pFLatency); |
| |
| /* Get APB1 prescaler */ |
| uwAPB1Prescaler = clkconfig.APB1CLKDivider; |
| |
| /* Compute TIM2 clock */ |
| if (uwAPB1Prescaler == RCC_HCLK_DIV1) |
| { |
| uwTimclock = HAL_RCC_GetPCLK1Freq(); |
| } |
| else |
| { |
| uwTimclock = 2 * HAL_RCC_GetPCLK1Freq(); |
| } |
| |
| /* Compute the prescaler value to have TIM2 counter clock equal to 1MHz */ |
| uwPrescalerValue = (uint32_t)((uwTimclock / 1000000U) - 1U); |
| |
| /* Initialize TIM2 */ |
| TimHandle.Instance = TIM2; |
| |
| /* Initialize TIMx peripheral as follow: |
| + Period = [(TIM2CLK/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 = 0U; |
| TimHandle.Init.CounterMode = TIM_COUNTERMODE_UP; |
| TimHandle.Init.AutoReloadPreload = TIM_AUTORELOAD_PRELOAD_DISABLE; |
| if (HAL_TIM_Base_Init(&TimHandle) == HAL_OK) |
| { |
| /* Start the TIM time Base generation in interrupt mode */ |
| return HAL_TIM_Base_Start_IT(&TimHandle); |
| } |
| |
| /* Return function status */ |
| return HAL_ERROR; |
| } |
| |
| /** |
| * @brief Suspend Tick increment. |
| * @note Disable the tick increment by disabling TIM2 update interrupt. |
| * @retval None |
| */ |
| void HAL_SuspendTick(void) |
| { |
| /* Disable TIM2 update Interrupt */ |
| __HAL_TIM_DISABLE_IT(&TimHandle, TIM_IT_UPDATE); |
| } |
| |
| /** |
| * @brief Resume Tick increment. |
| * @note Enable the tick increment by Enabling TIM2 update interrupt. |
| * @retval None |
| */ |
| void HAL_ResumeTick(void) |
| { |
| /* Enable TIM2 Update interrupt */ |
| __HAL_TIM_ENABLE_IT(&TimHandle, TIM_IT_UPDATE); |
| } |
| |
| /** |
| * @brief Period elapsed callback in non blocking mode |
| * @note This function is called when TIM2 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. |
| * @retval None |
| */ |
| void TIM2_IRQHandler(void) |
| { |
| HAL_TIM_IRQHandler(&TimHandle); |
| } |
| |
| /** |
| * @} |
| */ |
| |
| /** |
| * @} |
| */ |
| |
| /************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/ |