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HAL STM32 定时器PWM DMA输出方式

• 🧨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