STM32F091RC的TIM3生成PWM正常但无法驱动舵机问题排查

我基于STM32F091RC开发6自由度工业机器人，用多定时器生成PWM控制关节角度，已实现正逆运动学计算。目前TIM2可正常驱动舵机，但配置相同的TIM3无法驱动第二关节舵机，不确定是否遗漏配置。

相关代码 #

TIM3初始化代码 #

static void MX_TIM3_Init(void)
{

  /* USER CODE BEGIN TIM3_Init 0 */

  /* USER CODE END TIM3_Init 0 */

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

  /* USER CODE BEGIN TIM3_Init 1 */

  /* USER CODE END TIM3_Init 1 */
  htim3.Instance = TIM3;
  htim3.Init.Prescaler = 500;
  htim3.Init.CounterMode = TIM_COUNTERMODE_UP;
  htim3.Init.Period = 1919;
  htim3.Init.ClockDivision = TIM_CLOCKDIVISION_DIV1;
  htim3.Init.AutoReloadPreload = TIM_AUTORELOAD_PRELOAD_ENABLE;
  if (HAL_TIM_Base_Init(&htim3) != HAL_OK)
  {
    Error_Handler();
  }
  sClockSourceConfig.ClockSource = TIM_CLOCKSOURCE_INTERNAL;
  if (HAL_TIM_ConfigClockSource(&htim3, &sClockSourceConfig) != HAL_OK)
  {
    Error_Handler();
  }
  if (HAL_TIM_PWM_Init(&htim3) != HAL_OK)
  {
    Error_Handler();
  }
  sMasterConfig.MasterOutputTrigger = TIM_TRGO_RESET;
  sMasterConfig.MasterSlaveMode = TIM_MASTERSLAVEMODE_DISABLE;
  if (HAL_TIMEx_MasterConfigSynchronization(&htim3, &sMasterConfig) != HAL_OK)
  {
    Error_Handler();
  }
  sConfigOC.OCMode = TIM_OCMODE_PWM1;
  sConfigOC.Pulse = 0;
  sConfigOC.OCPolarity = TIM_OCPOLARITY_HIGH;
  sConfigOC.OCFastMode = TIM_OCFAST_DISABLE;
  if (HAL_TIM_PWM_ConfigChannel(&htim3, &sConfigOC, TIM_CHANNEL_1) != HAL_OK)
  {
    Error_Handler();
  }
  /* USER CODE BEGIN TIM3_Init 2 */

  /* USER CODE END TIM3_Init 2 */
  HAL_TIM_MspPostInit(&htim3);

}

定时器基础初始化文件 #

void HAL_TIM_Base_MspInit(TIM_HandleTypeDef* htim_base)
{
  if(htim_base->Instance==TIM2)
  {
  /* USER CODE BEGIN TIM2_MspInit 0 */

  /* USER CODE END TIM2_MspInit 0 */
    /* Peripheral clock enable */
    __HAL_RCC_TIM2_CLK_ENABLE();
  /* USER CODE BEGIN TIM2_MspInit 1 */

  /* USER CODE END TIM2_MspInit 1 */
  }
  if(htim_base->Instance==TIM3)
  {
      __HAL_RCC_TIM3_CLK_ENABLE();
  }
}

定时器后初始化文件 #

void HAL_TIM_MspPostInit(TIM_HandleTypeDef* htim)
{
  GPIO_InitTypeDef GPIO_InitStruct = {0};
  if(htim->Instance==TIM2)
  {
  /* USER CODE BEGIN TIM2_MspPostInit 0 */

  /* USER CODE END TIM2_MspPostInit 0 */
  
    __HAL_RCC_GPIOA_CLK_ENABLE();
    /**TIM2 GPIO Configuration    
    PA0     -------> TIM2_CH1 
    */
    GPIO_InitStruct.Pin = GPIO_PIN_0;
    GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
    GPIO_InitStruct.Pull = GPIO_NOPULL;
    GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_HIGH;
    GPIO_InitStruct.Alternate = GPIO_AF2_TIM2;
    HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);

  /* USER CODE BEGIN TIM2_MspPostInit 1 */

  /* USER CODE END TIM2_MspPostInit 1 */
  }
  else if(htim->Instance==TIM3)
  {
  /* USER CODE BEGIN TIM3_MspPostInit 0 */

  /* USER CODE END TIM3_MspPostInit 0 */

    __HAL_RCC_GPIOA_CLK_ENABLE();
    /**TIM3 GPIO Configuration
    PA6     -------> TIM3_CH1
    */
    GPIO_InitStruct.Pin = GPIO_PIN_6;
    GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
    GPIO_InitStruct.Pull = GPIO_NOPULL;
    GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
    GPIO_InitStruct.Alternate = GPIO_AF1_TIM3 ;
    HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);

  /* USER CODE BEGIN TIM3_MspPostInit 1 */

  /* USER CODE END TIM3_MspPostInit 1 */
  }
  if(htim->Instance==TIM14)
  {
  /* USER CODE BEGIN TIM14_MspPostInit 0 */

  /* USER CODE END TIM14_MspPostInit 0 */

    __HAL_RCC_GPIOA_CLK_ENABLE();
    /**TIM14 GPIO Configuration
    PA4     -------> TIM14_CH1
    */
    GPIO_InitStruct.Pin = GPIO_PIN_4;
    GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
    GPIO_InitStruct.Pull = GPIO_NOPULL;
    GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
    GPIO_InitStruct.Alternate = GPIO_AF4_TIM14;
    HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);

  /* USER CODE BEGIN TIM14_MspPostInit 1 */

  /* USER CODE END TIM14_MspPostInit 1 */
  }
}

TIM3 PWM输出波形 #

问题排查与修复方案 #

从代码和波形来看，存在以下关键问题：

• 注释与实际配置矛盾：TIM3初始化函数内的注释误写为TIM2_Init，后初始化中TIM3的引脚注释写PA1但实际配置PA6，需先核对硬件连接，若舵机接PA6则修正注释，若接PA1则修改引脚配置为GPIO_PIN_1。
• GPIO速度配置过低：TIM2用GPIO_SPEED_FREQ_HIGH，TIM3用GPIO_SPEED_FREQ_LOW，低速度会导致PWM信号边沿陡峭度不足，舵机无法稳定识别，建议将TIM3的GPIO速度改为GPIO_SPEED_FREQ_HIGH。
• 未启动TIM3 PWM输出：初始化完成后需调用HAL_TIM_PWM_Start(&htim3, TIM_CHANNEL_1);开启输出，检查代码是否遗漏此步骤。
• 初始脉宽无效：初始化时Pulse = 0，舵机需要1-2ms的有效脉宽（对应本定时器参数下的96~192），需添加代码设置初始脉宽，比如：

  // 设置初始脉宽为1.5ms（舵机中间位置）
  __HAL_TIM_SET_COMPARE(&htim3, TIM_CHANNEL_1, 144);
  

内容的提问来源于stack exchange，提问作者persona