配置PWM

RT-Thread studio里面的PWM驱动提示有误（浪费几个小时）

发布于 2022-06-28 15:39:40 浏览：192 订阅该版

一、原本的提示如下
```c
/** if you want to use pwm you can use the following instructions.
 *
 * STEP 1, open pwm driver framework support in the RT-Thread Settings file
 *
 * STEP 2, define macro related to the pwm
 *                 such as     #define BSP_USING_PWM1
 *
 * STEP 3, copy your pwm timer init function from stm32xxxx_hal_msp.c generated by stm32cubemx to the end if board.c file
 *                 such as     void HAL_TIM_Base_MspInit(TIM_HandleTypeDef* htim_base)  and
 *                             void HAL_TIM_MspPostInit(TIM_HandleTypeDef* htim)
 *
 * STEP 4, modify your stm32xxxx_hal_config.h file to support pwm peripherals. define macro related to the peripherals
 *                 such as     #define HAL_TIM_MODULE_ENABLED
 *
 */
```

需要把`void HAL_TIM_Base_MspInit(TIM_HandleTypeDef* htim_base)；`
改成`void HAL_TIM_PWM_MspInit(TIM_HandleTypeDef* tim_pwmHandle)；`
并且要打开通道的宏`#define BSP_USING_PWM3_CH1`

board.c
```c
void HAL_TIM_PWM_MspInit(TIM_HandleTypeDef* tim_pwmHandle)
{
    if (tim_pwmHandle->Instance == TIM3)
    {
        /* USER CODE BEGIN TIM3_MspInit 0 */

/* USER CODE END TIM3_MspInit 0 */
        /* TIM3 clock enable */
        __HAL_RCC_TIM3_CLK_ENABLE()
        ;
        /* USER CODE BEGIN TIM3_MspInit 1 */

/* USER CODE END TIM3_MspInit 1 */
    }
}

void HAL_TIM_MspPostInit(TIM_HandleTypeDef* timHandle)
{

GPIO_InitTypeDef GPIO_InitStruct = {0};
  if(timHandle->Instance==TIM3)
  {
  /* USER CODE BEGIN TIM3_MspPostInit 0 */

/* USER CODE END TIM3_MspPostInit 0 */

__HAL_RCC_GPIOB_CLK_ENABLE();
    /**TIM3 GPIO Configuration
    PB4     ------> TIM3_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_AF2_TIM3;
    HAL_GPIO_Init(GPIOB, &GPIO_InitStruct);

/* USER CODE BEGIN TIM3_MspPostInit 1 */

/* USER CODE END TIM3_MspPostInit 1 */
  }

}
```