基于cube的stm32f407定时器应用，125ms定时，晶振25M

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stm32_beginner 发布时间：2015-1-8 09:14

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本帖最后由 stm32_beginner 于 2015-1-8 09:20 编辑

基于cube的stm32f407定时器应用，125ms定时，晶振25M

时钟配置：
void SystemClock_Config(void)
{

  RCC_ClkInitTypeDef RCC_ClkInitStruct;
  RCC_OscInitTypeDef RCC_OscInitStruct;

  /* Enable Power Control clock */
  __PWR_CLK_ENABLE();

  /* The voltage scaling allows optimizing the power consumption when the device is
   clocked below the maximum system frequency, to update the voltage scaling value
   regarding system frequency refer to product datasheet.  */
  __HAL_PWR_VOLTAGESCALING_CONFIG(PWR_REGULATOR_VOLTAGE_SCALE1);

  /* Enable HSE Oscillator and activate PLL with HSE as source */
  RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSE;
  RCC_OscInitStruct.HSEState = RCC_HSE_ON;
  RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
  RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSE;
  RCC_OscInitStruct.PLL.PLLM = 8;
  RCC_OscInitStruct.PLL.PLLN = 336;
  RCC_OscInitStruct.PLL.PLLP = RCC_PLLP_DIV2;
  RCC_OscInitStruct.PLL.PLLQ = 7;
  HAL_RCC_OscConfig(&RCC_OscInitStruct);

  /* Select PLL as system clock source and configure the HCLK, PCLK1 and PCLK2 clocks dividers */
  RCC_ClkInitStruct.ClockType = (RCC_CLOCKTYPE_SYSCLK | RCC_CLOCKTYPE_HCLK | RCC_CLOCKTYPE_PCLK1 | RCC_CLOCKTYPE_PCLK2);
  RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK;
  RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
  RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV4;
  RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV2;
  HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_5);

}

定时器初始化：
/* TIM6 init function */
void MX_TIM6_Init(void)
{

      /* -----------------------------------------------------------------------
In this example TIM3 input clock (TIM3CLK) is set to 2 * APB1 clock (PCLK1),
since APB1 prescaler is different from 1.
   TIM3CLK = 2 * PCLK1
   PCLK1 = HCLK / 4
   => TIM3CLK = HCLK / 2 = SystemCoreClock /2 =84
To get TIM3 counter clock at 10 KHz, the Prescaler is computed as following:
Prescaler = (TIM3CLK / TIM3 counter clock) - 1
Prescaler = ((SystemCoreClock /2) /10 KHz) - 1

Note:
   SystemCoreClock variable holds HCLK frequency and is defined in system_stm32f4xx.c file.
   Each time the core clock (HCLK) changes, user had to update SystemCoreClock
   variable value. Otherwise, any configuration based on this variable will be incorrect.
   This variable is updated in three ways:
   1) by calling CMSIS function SystemCoreClockUpdate()
   2) by calling HAL API function HAL_RCC_GetSysClockFreq()
   3) each time HAL_RCC_ClockConfig() is called to configure the system clock frequency
  ----------------------------------------------------------------------- */
  /* Compute the prescaler value to have TIM3 counter clock equal to 10 KHz */
  uwPrescalerValue = (uint32_t) ((SystemCoreClock /2) / 10000) - 1;                      //10KHz·ÖÆµ 1ÃëÖÓ10000´Î

  /* Set TIMx instance */
  htim6.Instance = TIM6;

  /* Initialize TIM3 peripheral as follow:
   + Period = 10000 - 1
   + Prescaler = ((SystemCoreClock/2)/10000) - 1
   + ClockDivision = 0
   + Counter direction = Up
  */
  //htim6.Init.Period = 5000 - 1;
      htim6.Init.Period = 1250 - 1;
  htim6.Init.Prescaler = uwPrescalerValue;
  htim6.Init.ClockDivision = 0;
  htim6.Init.CounterMode = TIM_COUNTERMODE_UP;
  if(HAL_TIM_Base_Init(&htim6) != HAL_OK)
  {
/* Initialization Error */
//Error_Handler();
  }

  /*##-2- Start the TIM Base generation in interrupt mode ####################*/
  /* Start Channel1 */
  if(HAL_TIM_Base_Start_IT(&htim6) != HAL_OK)
  {
/* Starting Error */
//Error_Handler();
  }

}

中断处理，125msx4=500ms:

void HAL_TIM_PeriodElapsedCallback(TIM_HandleTypeDef *htim)
{
  //BSP_LED_Toggle(LED4);HAL_GPIO_TogglePin(GPIO_PORT[Led], GPIO_PIN[Led]);

      if(++flag_125ms == 4)
      {
            HAL_GPIO_TogglePin(GPIOD, GPIO_PIN_12);  //TestLed
            flag_125ms = 0;
      }
}

附加源码(里面其他应用内容准备在板子上应用的，才写了初始化和配置，请忽略不计，懒得删除了)