HAL STM32 定时器PWM DMA输出方式

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• 🧨遗留问题：当配置RCR重复计数器，配置为2时，在定义了3组PWM参数情况下，只能输出第二组参数的PWM波形。（HAL_TIM_PWM_Start_DMA(&htim1, TIM_CHANNEL_1, aCCValue_Buffer, 3)）；设置其它计数值，则没有问题。如果RCR重复计数器为2，DMA配置2组PWM参数也没有问题。（HAL_TIM_PWM_Start_DMA(&htim1, TIM_CHANNEL_1, aCCValue_Buffer, 2)）。
  
  
  

void MX_TIM1_Init(void)
{

  /* USER CODE BEGIN TIM1_Init 0 */

  /* USER CODE END TIM1_Init 0 */

  TIM_ClockConfigTypeDef sClockSourceConfig = {0};
  TIM_MasterConfigTypeDef sMasterConfig = {0};
  TIM_OC_InitTypeDef sConfigOC = {0};
  TIM_BreakDeadTimeConfigTypeDef sBreakDeadTimeConfig = {0};

  /* USER CODE BEGIN TIM1_Init 1 */

  /* USER CODE END TIM1_Init 1 */
  htim1.Instance = TIM1;
  htim1.Init.Prescaler = 84-1;
  htim1.Init.CounterMode = TIM_COUNTERMODE_UP;
  htim1.Init.Period = 10000;
  htim1.Init.ClockDivision = TIM_CLOCKDIVISION_DIV1;
  htim1.Init.RepetitionCounter = 3;//配置2则只能输出一组pwm波形
  htim1.Init.AutoReloadPreload = TIM_AUTORELOAD_PRELOAD_DISABLE;
  if (HAL_TIM_Base_Init(&htim1) != HAL_OK)
  {
    Error_Handler();
  }
  sClockSourceConfig.ClockSource = TIM_CLOCKSOURCE_INTERNAL;
  if (HAL_TIM_ConfigClockSource(&htim1, &sClockSourceConfig) != HAL_OK)
  {
    Error_Handler();
  }
  if (HAL_TIM_PWM_Init(&htim1) != HAL_OK)
  {
    Error_Handler();
  }
  sMasterConfig.MasterOutputTrigger = TIM_TRGO_RESET;
  sMasterConfig.MasterSlaveMode = TIM_MASTERSLAVEMODE_DISABLE;
  if (HAL_TIMEx_MasterConfigSynchronization(&htim1, &sMasterConfig) != HAL_OK)
  {
    Error_Handler();
  }
  sConfigOC.OCMode = TIM_OCMODE_PWM1;
  sConfigOC.Pulse = 5000;
  sConfigOC.OCPolarity = TIM_OCPOLARITY_HIGH;
  sConfigOC.OCNPolarity = TIM_OCNPOLARITY_HIGH;
  sConfigOC.OCFastMode = TIM_OCFAST_DISABLE;
  sConfigOC.OCIdleState = TIM_OCIDLESTATE_RESET;
  sConfigOC.OCNIdleState = TIM_OCNIDLESTATE_RESET;
  if (HAL_TIM_PWM_ConfigChannel(&htim1, &sConfigOC, TIM_CHANNEL_1) != HAL_OK)
  {
    Error_Handler();
  }
  sBreakDeadTimeConfig.OffStateRunMode = TIM_OSSR_DISABLE;
  sBreakDeadTimeConfig.OffStateIDLEMode = TIM_OSSI_DISABLE;
  sBreakDeadTimeConfig.LockLevel = TIM_LOCKLEVEL_OFF;
  sBreakDeadTimeConfig.DeadTime = 0;
  sBreakDeadTimeConfig.BreakState = TIM_BREAK_DISABLE;
  sBreakDeadTimeConfig.BreakPolarity = TIM_BREAKPOLARITY_HIGH;
  sBreakDeadTimeConfig.AutomaticOutput = TIM_AUTOMATICOUTPUT_DISABLE;
  if (HAL_TIMEx_ConfigBreakDeadTime(&htim1, &sBreakDeadTimeConfig) != HAL_OK)
  {
    Error_Handler();
  }
  /* USER CODE BEGIN TIM1_Init 2 */

  /* USER CODE END TIM1_Init 2 */
  HAL_TIM_MspPostInit(&htim1);

}

• 🔖重复计数设置为3，输出的3组pwm参数波形：
  
• 🔖重复计数设置为1，输出的3组pwm参数波形：
  
• 🔖重复计数设置为0，输出的3组pwm参数波形：
  

• 📑RCR寄存器中的值会随着定时器更新事件递减，一直到0，在允许更新事件UEV发生的情况下，则TIM的更新事件UEV就会产生；如果设置RCR的值为N，那么PWM模式下，更新事件将会在弟N+1个周期发生；
  

🛠STM32CubeMX配置

• 🌿选择定时TIM1，时钟源选择内部时钟源，PWM通道选择
  
• 🌿PWM参数配置；（Output compare preload默认使能开启）
  
• 🌿DMA配置（stm32F4）
  
  -🔖 stm32f103
  

📄业务代表

• 🌿main函数

int main(void)
{

  /* USER CODE BEGIN 1 */
	uint32_t aCCValue_Buffer[3] = {0, 0, 0};
  /* Compute CCR1 value to generate a duty cycle at 80% */
  aCCValue_Buffer[2] = (uint32_t)(((uint32_t) 80 * (10000 - 1)) / 100); //84000 000
  /* Compute CCR1 value to generate a duty cycle at 50% */
  aCCValue_Buffer[1] = (uint32_t)(((uint32_t) 50 * (10000 - 1)) / 100);
  /* Compute CCR1 value to generate a duty cycle at 25% */
  aCCValue_Buffer[0] = (uint32_t)(((uint32_t) 25 * (10000 - 1)) / 100);
  /* USER CODE END 1 */

  /* MCU Configuration--------------------------------------------------------*/

  /* Reset of all peripherals, Initializes the Flash interface and the Systick. */
  HAL_Init();

  /* USER CODE BEGIN Init */

  /* USER CODE END Init */

  /* Configure the system clock */
  SystemClock_Config();

  /* USER CODE BEGIN SysInit */

  /* USER CODE END SysInit */

  /* Initialize all configured peripherals */
  MX_GPIO_Init();
  MX_DMA_Init();
  MX_TIM1_Init();
  /* USER CODE BEGIN 2 */
  /*## Start PWM signal generation in DMA mode ############################*/
  if (HAL_TIM_PWM_Start_DMA(&htim1, TIM_CHANNEL_1, aCCValue_Buffer, 3) != HAL_OK)
  {
    /* Starting Error */
    Error_Handler();
  }
  /* USER CODE END 2 */

  /* Infinite loop */
  /* USER CODE BEGIN WHILE */
  while (1)
  {
    /* USER CODE END WHILE */

    /* USER CODE BEGIN 3 */
  }
  /* USER CODE END 3 */
}

参数工程

• 🌿stm32f103

链接：https://pan.baidu.com/s/1bKWQSkmbv4WoJgH07g9Y6g?pwd=ihj3 
提取码：ihj3

• 🌿stm32f401

链接：https://pan.baidu.com/s/1KtpPRzCX_xS4ZaDI-uty6w?pwd=w0qj 
提取码：w0qj