stm32h7xx_hal_timebase_tim.c

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/* USER CODE BEGIN Header */
/* USER CODE END Header */
 
/* Includes ------------------------------------------------------------------*/
#include "stm32h7xx_hal.h"
#include "stm32h7xx_hal_tim.h"
 
/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
/* Private macro -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
TIM_HandleTypeDef        htim4;
/* Private function prototypes -----------------------------------------------*/
/* Private functions ---------------------------------------------------------*/
 
HAL_StatusTypeDef HAL_InitTick(uint32_t TickPriority)
{
  RCC_ClkInitTypeDef    clkconfig;
  uint32_t              uwTimclock, uwAPB1Prescaler;
  uint32_t              uwPrescalerValue;
  uint32_t              pFLatency;
 
  /*Configure the TIM4 IRQ priority */
  if (TickPriority < (1UL << __NVIC_PRIO_BITS))
   {
     HAL_NVIC_SetPriority(TIM4_IRQn, TickPriority ,0);
 
     /* Enable the TIM4 global Interrupt */
     HAL_NVIC_EnableIRQ(TIM4_IRQn);
     uwTickPrio = TickPriority;
    }
  else
  {
    return HAL_ERROR;
  }
 
  /* Enable TIM4 clock */
  __HAL_RCC_TIM4_CLK_ENABLE();
 
  /* Get clock configuration */
  HAL_RCC_GetClockConfig(&clkconfig, &pFLatency);
 
  /* Get APB1 prescaler */
  uwAPB1Prescaler = clkconfig.APB1CLKDivider;
  /* Compute TIM4 clock */
  if (uwAPB1Prescaler == RCC_HCLK_DIV1)
  {
    uwTimclock = HAL_RCC_GetPCLK1Freq();
  }
  else
  {
    uwTimclock = 2UL * HAL_RCC_GetPCLK1Freq();
  }
 
  /* Compute the prescaler value to have TIM4 counter clock equal to 1MHz */
  uwPrescalerValue = (uint32_t) ((uwTimclock / 1000000U) - 1U);
 
  /* Initialize TIM4 */
  htim4.Instance = TIM4;
 
  /* Initialize TIMx peripheral as follow:
   * Period = [(TIM4CLK/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
   */
  htim4.Init.Period = (1000000U / 1000U) - 1U;
  htim4.Init.Prescaler = uwPrescalerValue;
  htim4.Init.ClockDivision = 0;
  htim4.Init.CounterMode = TIM_COUNTERMODE_UP;
 
  if(HAL_TIM_Base_Init(&htim4) == HAL_OK)
  {
    /* Start the TIM time Base generation in interrupt mode */
    return HAL_TIM_Base_Start_IT(&htim4);
  }
 
  /* Return function status */
  return HAL_ERROR;
}
 
void HAL_SuspendTick(void)
{
  /* Disable TIM4 update Interrupt */
  __HAL_TIM_DISABLE_IT(&htim4, TIM_IT_UPDATE);
}
 
void HAL_ResumeTick(void)
{
  /* Enable TIM4 Update interrupt */
  __HAL_TIM_ENABLE_IT(&htim4, TIM_IT_UPDATE);
}