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/**
******************************************************************************
* @file stm32f1xx_hal_timebase_tim_template.c
* @author MCD Application Team
* @version V1.1.0
* @date 14-April-2017
* @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****/
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