STM32CubeMX(2)——PWM实验

朴灿烈づ我的快乐病毒、 2022-10-30 11:20 349阅读 0赞

# 硬件 #

正点原子精英板ZET6

PB5 TIM3\_CH2

# 软件 #

### 1. 设置外部时钟源 ###

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM1Njk3OTc4_size_16_color_FFFFFF_t_70][]

### 2. 设置时钟频率 ###

输入72之后直接点回车确定，自动配置相应时钟

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM1Njk3OTc4_size_16_color_FFFFFF_t_70 1][]

### 3.设置DeBug ###

设置相应下载方式，不设置这个没有开启下载口，无法下载

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM1Njk3OTc4_size_16_color_FFFFFF_t_70 2][]

### 4.查找数据手册小灯对应TIM通道 ###

查找数据手册，发现PE5没有对应的TIM通道，因此只能使用PB5，对应TIM3\_CH2

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM1Njk3OTc4_size_16_color_FFFFFF_t_70 3][]

### 5. 设置PWM通道 ###

如下图，如果只设置时钟源和通道，发现对应的IO口是PA7

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM1Njk3OTc4_size_16_color_FFFFFF_t_70 4][]

左键点击芯片上PB5，设置TIM3，自动从PA7编程PB5

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM1Njk3OTc4_size_16_color_FFFFFF_t_70 5][]

设置预分频72、最大计数值500、低电平有效

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM1Njk3OTc4_size_16_color_FFFFFF_t_70 6][]

调节占空比（2021.4.28添加）

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM1Njk3OTc4_size_16_color_FFFFFF_t_70 7][]

代码修改，代码中要加这两行，否则无法得到PWM脉冲，最后一位是占空比，3600/7200（2021.4.28添加）

HAL_TIM_PWM_Start(&htim3,TIM_CHANNEL_3);
      __HAL_TIM_SetCompare(&htim3, TIM_CHANNEL_3, 3600); 
      HAL_TIM_PWM_Start(&htim3,TIM_CHANNEL_1);
      __HAL_TIM_SetCompare(&htim3, TIM_CHANNEL_1, 3600);

### 6.导出设置 ###

项目名称、生成位置、选择生成哪个IDE代码

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM1Njk3OTc4_size_16_color_FFFFFF_t_70 8][]

设置只包含需要的库文件

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM1Njk3OTc4_size_16_color_FFFFFF_t_70 9][]

生成代码

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM1Njk3OTc4_size_16_color_FFFFFF_t_70 10][]

### 7. 在MDk中打开 ###

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM1Njk3OTc4_size_16_color_FFFFFF_t_70 11][]

直接替换Main.c代码

/* USER CODE BEGIN Header */
    /**
      ******************************************************************************
      * @file           : main.c
      * @brief          : Main program body
      ******************************************************************************
      * @attention
      *
      * <h2><center>© Copyright (c) 2021 STMicroelectronics.
      * All rights reserved.</center></h2>
      *
      * This software component is licensed by ST under BSD 3-Clause license,
      * the "License"; You may not use this file except in compliance with the
      * License. You may obtain a copy of the License at:
      *                        opensource.org/licenses/BSD-3-Clause
      *
      ******************************************************************************
      */
    /* USER CODE END Header */
    /* Includes ------------------------------------------------------------------*/
    #include "main.h"
    #include "tim.h"
    #include "gpio.h"
    
    /* Private includes ----------------------------------------------------------*/
    /* USER CODE BEGIN Includes */
    
    /* USER CODE END Includes */
    
    /* Private typedef -----------------------------------------------------------*/
    /* USER CODE BEGIN PTD */
    
    /* USER CODE END PTD */
    
    /* Private define ------------------------------------------------------------*/
    /* USER CODE BEGIN PD */
    /* USER CODE END PD */
    
    /* Private macro -------------------------------------------------------------*/
    /* USER CODE BEGIN PM */
    
    /* USER CODE END PM */
    
    /* Private variables ---------------------------------------------------------*/
    
    /* USER CODE BEGIN PV */
    
    /* USER CODE END PV */
    
    /* Private function prototypes -----------------------------------------------*/
    void SystemClock_Config(void);
    /* USER CODE BEGIN PFP */
    
    /* USER CODE END PFP */
    
    /* Private user code ---------------------------------------------------------*/
    /* USER CODE BEGIN 0 */
    
    /* USER CODE END 0 */
    
    /**
      * @brief  The application entry point.
      * @retval int
      */
    int main(void)
    {
      /* USER CODE BEGIN 1 */
        uint16_t pwmVal=0;   //PWM占空比
        uint8_t dir=1;
      /* 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_TIM3_Init();
      /* USER CODE BEGIN 2 */
        HAL_TIM_PWM_Start(&htim3,TIM_CHANNEL_2);
      /* USER CODE END 2 */
    
      /* Infinite loop */
      /* USER CODE BEGIN WHILE */
        while (1)
        {
        /* USER CODE END WHILE */
    
        /* USER CODE BEGIN 3 */
            while (pwmVal< 800)
            {
                pwmVal++;
                __HAL_TIM_SetCompare(&htim3, TIM_CHANNEL_2, pwmVal);    //修改比较值，修改占空比
    //		  TIM3->CCR1 = pwmVal;    与上方相同
                HAL_Delay(1);
            }
            while (pwmVal)
            {
                pwmVal--;
                __HAL_TIM_SetCompare(&htim3, TIM_CHANNEL_2, pwmVal);    //修改比较值，修改占空比
    //		  TIM3->CCR1 = pwmVal;     与上方相同
                HAL_Delay(1);
            }
            HAL_Delay(200);
        }
      /* USER CODE END 3 */
    }
    
    /**
      * @brief System Clock Configuration
      * @retval None
      */
    void SystemClock_Config(void)
    {
      RCC_OscInitTypeDef RCC_OscInitStruct = {0};
      RCC_ClkInitTypeDef RCC_ClkInitStruct = {0};
    
      /** Initializes the RCC Oscillators according to the specified parameters
      * in the RCC_OscInitTypeDef structure.
      */
      RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSE;
      RCC_OscInitStruct.HSEState = RCC_HSE_ON;
      RCC_OscInitStruct.HSEPredivValue = RCC_HSE_PREDIV_DIV1;
      RCC_OscInitStruct.HSIState = RCC_HSI_ON;
      RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
      RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSE;
      RCC_OscInitStruct.PLL.PLLMUL = RCC_PLL_MUL9;
      if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK)
      {
        Error_Handler();
      }
      /** Initializes the CPU, AHB and APB buses clocks
      */
      RCC_ClkInitStruct.ClockType = RCC_CLOCKTYPE_HCLK|RCC_CLOCKTYPE_SYSCLK
                                  |RCC_CLOCKTYPE_PCLK1|RCC_CLOCKTYPE_PCLK2;
      RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK;
      RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
      RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV2;
      RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV1;
    
      if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_2) != HAL_OK)
      {
        Error_Handler();
      }
    }
    
    /* USER CODE BEGIN 4 */
    
    /* USER CODE END 4 */
    
    /**
      * @brief  This function is executed in case of error occurrence.
      * @retval None
      */
    void Error_Handler(void)
    {
      /* USER CODE BEGIN Error_Handler_Debug */
        /* User can add his own implementation to report the HAL error return state */
    
      /* USER CODE END Error_Handler_Debug */
    }
    
    #ifdef  USE_FULL_ASSERT
    /**
      * @brief  Reports the name of the source file and the source line number
      *         where the assert_param error has occurred.
      * @param  file: pointer to the source file name
      * @param  line: assert_param error line source number
      * @retval None
      */
    void assert_failed(uint8_t *file, uint32_t line)
    {
      /* USER CODE BEGIN 6 */
        /* User can add his own implementation to report the file name and line number,
           tex: printf("Wrong parameters value: file %s on line %d\r\n", file, line) */
      /* USER CODE END 6 */
    }
    #endif /* USE_FULL_ASSERT */
    
    /************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/

主要改了三个地方

/* USER CODE BEGIN 1 */
        uint16_t pwmVal=0;   //PWM占空比
        uint8_t dir=1;
      /* USER CODE END 1 */

/* USER CODE BEGIN 2 */
        HAL_TIM_PWM_Start(&htim3,TIM_CHANNEL_2);
      /* USER CODE END 2 */

while (pwmVal< 800)
            {
                pwmVal++;
                __HAL_TIM_SetCompare(&htim3, TIM_CHANNEL_2, pwmVal);    //修改比较值，修改占空比
    //		  TIM3->CCR1 = pwmVal;    与上方相同
                HAL_Delay(1);
            }
            while (pwmVal)
            {
                pwmVal--;
                __HAL_TIM_SetCompare(&htim3, TIM_CHANNEL_2, pwmVal);    //修改比较值，修改占空比
    //		  TIM3->CCR1 = pwmVal;     与上方相同
                HAL_Delay(1);
            }
            HAL_Delay(200);

参考：[https://blog.csdn.net/as480133937/article/details/99231677][https_blog.csdn.net_as480133937_article_details_99231677]

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[https_blog.csdn.net_as480133937_article_details_99231677]: https://blog.csdn.net/as480133937/article/details/99231677