PWM配置一直没法输出？

发布于 2020-09-12 15:06:24 浏览：2509 订阅该版

8 个回答

KJUS_6193 2020-09-12

这家伙很懒，什么也没写！

我刚刚完成了PWM控制LED的实验，分享一下吧，有两个地方比较关键
1：例如要把
```c
void HAL_TIM_MspPostInit(TIM_HandleTypeDef *htim);
                    /**
  * Initializes the Global MSP.
  */
void HAL_MspInit(void)
{
  /* USER CODE BEGIN MspInit 0 */

/* USER CODE END MspInit 0 */

__HAL_RCC_AFIO_CLK_ENABLE();
  __HAL_RCC_PWR_CLK_ENABLE();

/* System interrupt init*/

/** NOJTAG: JTAG-DP Disabled and SW-DP Enabled
  */
  __HAL_AFIO_REMAP_SWJ_NOJTAG();

/* USER CODE BEGIN MspInit 1 */

/* USER CODE END MspInit 1 */
}

/**
* @brief TIM_Base MSP Initialization
* This function configures the hardware resources used in this example
* @param htim_base: TIM_Base handle pointer
* @retval None
*/
void HAL_TIM_Base_MspInit(TIM_HandleTypeDef* htim_base)
{
  if(htim_base->Instance==TIM3)
  {
  /* USER CODE BEGIN TIM3_MspInit 0 */

/* USER CODE END TIM3_MspInit 0 */
    /* Peripheral 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* htim)
{
  GPIO_InitTypeDef GPIO_InitStruct = {0};
  if(htim->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.Speed = GPIO_SPEED_FREQ_LOW;
    HAL_GPIO_Init(GPIOB, &GPIO_InitStruct);

__HAL_AFIO_REMAP_TIM3_PARTIAL();

/* USER CODE BEGIN TIM3_MspPostInit 1 */

/* USER CODE END TIM3_MspPostInit 1 */
  }

}
/**
* @brief TIM_Base MSP De-Initialization
* This function freeze the hardware resources used in this example
* @param htim_base: TIM_Base handle pointer
* @retval None
*/
void HAL_TIM_Base_MspDeInit(TIM_HandleTypeDef* htim_base)
{
  if(htim_base->Instance==TIM3)
  {
  /* USER CODE BEGIN TIM3_MspDeInit 0 */

/* USER CODE END TIM3_MspDeInit 0 */
    /* Peripheral clock disable */
    __HAL_RCC_TIM3_CLK_DISABLE();
  /* USER CODE BEGIN TIM3_MspDeInit 1 */

/* USER CODE END TIM3_MspDeInit 1 */
  }

}
```
cubeMX中定时器配置的代码复制到board.c
2：要做主函数手动初始化定时器，例如
```c
/*
 * Copyright (c) 2006-2020, RT-Thread Development Team
 *
 * SPDX-License-Identifier: Apache-2.0
 *
 * Change Logs:
 * Date           Author       Notes
 * 2020-09-08     RT-Thread    first version
 */

#include <rtthread.h>
#include <board.h>
#include <drv_common.h>
#include <rtdevice.h>
#define DBG_TAG "main"
#define DBG_LVL DBG_LOG
#include <rtdbg.h>
TIM_HandleTypeDef htim3;
static void MX_TIM3_Init(void);
int main(void)
{
    int count = 1;
    MX_TIM3_Init();
    while (count++)
    {
        LOG_D("Hello RT-Thread!");
        rt_thread_mdelay(2000);
    }

return RT_EOK;
}

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 = 0;
  htim3.Init.CounterMode = TIM_COUNTERMODE_UP;
  htim3.Init.Period = 0;
  htim3.Init.ClockDivision = TIM_CLOCKDIVISION_DIV1;
  htim3.Init.AutoReloadPreload = TIM_AUTORELOAD_PRELOAD_DISABLE;
  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);

}

```
我用的是studio v1.1.3其他的仔细看教程