【自学嵌入式：stm32单片机】PWM驱动LED呼吸灯

注意：
STM32Cube这里一定要这样设置：
image
否则STLINK不能正常下载程序，然后还得重置跳线帽
如果出现STLINK找不到的问题，可按此视频处理，我就遇到了：https://www.bilibili.com/video/BV1yePve3E84

目录

PWM驱动LED呼吸灯

PWN驱动LED呼吸灯原理详见：https://www.cnblogs.com/qinruiqian/p/19022573

接线图

image

关于引脚重映射

image
如果想把PA0改到PA15，就可以选择部分重映射方式1
因为PA15是JTDI的调试端口，还得让调试端口重映射
image

代码实现

标准库实现

已开源到：https://gitee.com/qin-ruiqian/jiangkeda-stm32

PWM.h

#ifndef __PWM_H
#define __PWM_H

void PWM_Init(void); //PWM初始化
void PWM_SetCompare1(uint16_t Compare); //调整CCR的值，占空比

#endif

PWM.c

#include "stm32f10x.h"                  // Device header

//PWM初始化函数
void PWM_Init(void)
{
	//开启引脚重映射
	//需要打开AFIO
	//RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO, ENABLE);
	//GPIO_PinRemapConfig(GPIO_PartialRemap1_TIM2, ENABLE); //把PA0换到PA15
	//引脚定义种，PA15已经是JTDI调试端口
	//如果想让PA15作为普通的GPIO或者复用定时器的通道
	//需要先关闭调试端口的复用
	//GPIO_PinRemapConfig(GPIO_Remap_SWJ_JTAGDisable, ENABLE);
	
	
	//初始化PA0
	//打开APB2总线的GPIOA外设并开启时钟
	RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);
	GPIO_InitTypeDef GPIO_InitStructure;
	GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; //复用推挽输出，
	//普通推挽/开漏输出，引脚控制权是来自于输出数据寄存器的
	//如果想用定时器来控制引脚，就需要使用复用开漏/推挽输出的模式
	//在这里输出数据寄存器将被断开，输出控制权将转移给片上外设
	GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0; //A0口打开，如果重映射，改成PIN15
	GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
	GPIO_Init(GPIOA, &GPIO_InitStructure);
	//开启时钟，TIM2是APB1总线的外设
	RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);
	//选择时基单元的时钟，选择内部时钟
	TIM_InternalClockConfig(TIM2); //TIM2的时钟单元由内部时钟来驱动
	// 初始化时基单元用的结构体
	TIM_TimeBaseInitTypeDef TIM_TimeBaseInitStructure;
	TIM_TimeBaseInitStructure.TIM_ClockDivision = TIM_CKD_DIV1; //选择滤波器1分频
	TIM_TimeBaseInitStructure.TIM_CounterMode = TIM_CounterMode_Up; //向上计数
	//定时频率=72MHz/(PSC+1)/(ARR+1)
	//定时1s，也就是定时频率为1Hz
	TIM_TimeBaseInitStructure.TIM_Period = 100 - 1; //ARR，16位寄存器，在0-65535范围
	TIM_TimeBaseInitStructure.TIM_Prescaler = 720 - 1; //PSC，16位寄存器，在0-65535范围
	TIM_TimeBaseInitStructure.TIM_RepetitionCounter = 0; //重复计数器，高级计数器才有的，置0就行，TIM2-TIM4是通用计数器
	TIM_TimeBaseInit(TIM2, &TIM_TimeBaseInitStructure);
	//初始化OC输出比较单元
	//使用PA0口，对应第一个输出比较通道
	TIM_OCInitTypeDef TIM_OCInitStructure;
	TIM_OCStructInit(&TIM_OCInitStructure); //给结构体赋初值
	//TIM_OCInitStructure.TIM_OCIdleState = ; //高级定时器才用到
	TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1; //设置比较模式
	//TIM_OCInitStructure.TIM_OCNIdleState = ; //高级定时器才用到
	//TIM_OCInitStructure.TIM_OCNPolarity = ; //高级定时器才用到
	TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High; //设置输出比较的极性，REF有效时输出高电平
	//TIM_OCInitStructure.TIM_OutputNState = ; //高级定时器才用到
	TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable; //设置输出使能
	//PWM频率： Freq = CK_PSC / (PSC + 1) / (ARR + 1)（也是计数器的更新频率）
	//PWM占空比： Duty = CCR / (ARR + 1)
	//PWM分辨率： Reso = 1 / (ARR + 1)
	//如果要产生一个频率为1KHz，占空比为50%，分辨率为1%的PWM波形
	//解得ARR = 100 - 1 =99，CRR = 50， PSC = 720-1=719
	//如果CCR改成10，占空比就是10%
	//CCR改成90，占空比就是90%
	//初始化阶段暂时给0
	TIM_OCInitStructure.TIM_Pulse = 0; //设置CCR
	TIM_OC1Init(TIM2, &TIM_OCInitStructure); //使用TIM2的OC1，也就是CH1通道，输出PWM，只能在PA0的引脚上输出，而不能选择任意引脚输出
	//启动定时器
	TIM_Cmd(TIM2, ENABLE);
}

//调整CCR的值（占空比）
void PWM_SetCompare1(uint16_t Compare)
{
	TIM_SetCompare1(TIM2, Compare);
}

main.c

#include "stm32f10x.h"                  // Device header
#include "Delay.h"
#include "MYOLED.h"
#include "PWM.h"

uint8_t i; //循环变量

int main(void)
{
	PWM_Init();
	MYOLED_Init();
	while(1)
	{
		MYOLED_ShowNum(0,0, TIM_GetCounter(TIM2), 5);
		//逐渐变亮
		for(i = 0; i <= 100; i++)
		{
			PWM_SetCompare1(i);
			Delay_ms(10); //延迟10ms一个亮度
		}
		//逐渐变暗
		for(i = 1; i <= 100; i++)
		{
			PWM_SetCompare1(100 - i);
			Delay_ms(10); //延迟10ms一个亮度
		}
	}
}

HAL库实现

IOC配置文件可以直接看我开源的代码，已开源到：https://gitee.com/qin-ruiqian/jiangkeda-stm32-hal

PWM.h

/*
 * PWM.h
 *
 *  Created on: Aug 13, 2025
 *      Author: Administrator
 */

#ifndef HARDWARE_PWM_H_
#define HARDWARE_PWM_H_

void PWM_SetCompare1(uint16_t Compare, TIM_HandleTypeDef htim);

#endif /* HARDWARE_PWM_H_ */

PWM.c

/*
 * PWM.c
 *
 *  Created on: Aug 13, 2025
 *      Author: Administrator
 */


#include "stm32f1xx_hal.h"

// 调整CCR的值（占空比）
// 因为STM32Cube自动生成的代码在main中，所以把TIM2定时器结构体指针当参数传进来
void PWM_SetCompare1(uint16_t Compare, TIM_HandleTypeDef htim)
{
    //__HAL_TIM_SET_COMPARE(&htim, TIM_CHANNEL_1, Compare); 已被废弃的写法
	htim.Instance->CCR1 = Compare;
}

main.c

/* USER CODE BEGIN Header */
/**
  ******************************************************************************
  * @file           : main.c
  * @brief          : Main program body
  ******************************************************************************
  * @attention
  *
  * Copyright (c) 2025 STMicroelectronics.
  * All rights reserved.
  *
  * This software is licensed under terms that can be found in the LICENSE file
  * in the root directory of this software component.
  * If no LICENSE file comes with this software, it is provided AS-IS.
  *
  ******************************************************************************
  */
/* USER CODE END Header */
/* Includes ------------------------------------------------------------------*/
#include "main.h"

/* Private includes ----------------------------------------------------------*/
/* USER CODE BEGIN Includes */
#include "PWM.h"
#include "MYOLED.h"
/* 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 ---------------------------------------------------------*/
TIM_HandleTypeDef htim2;

/* USER CODE BEGIN PV */
uint8_t i; //循环变量
/* USER CODE END PV */

/* Private function prototypes -----------------------------------------------*/
void SystemClock_Config(void);
static void MX_GPIO_Init(void);
static void MX_TIM2_Init(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 */

  /* 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_TIM2_Init();
  /* USER CODE BEGIN 2 */
  HAL_TIM_PWM_Start(&htim2, TIM_CHANNEL_1);
  MYOLED_Init();
  /* USER CODE END 2 */
  /* Infinite loop */
  /* USER CODE BEGIN WHILE */
  while (1)
  {
	  	MYOLED_ShowNum(0,0, __HAL_TIM_GET_COUNTER(&htim2), 5);
		//逐渐变亮
		for(i = 0; i <= 100; i++)
		{
			PWM_SetCompare1(i, (htim2));
			HAL_Delay(10); //延迟10ms一个亮度
		}
		//逐渐变暗
		for(i = 1; i <= 100; i++)
		{
			PWM_SetCompare1(100 - i, (htim2));
			HAL_Delay(10); //延迟10ms一个亮度
		}
    /* USER CODE END WHILE */

    /* USER CODE BEGIN 3 */
  }
  /* 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();
  }
}

/**
  * @brief TIM2 Initialization Function
  * @param None
  * @retval None
  */
static void MX_TIM2_Init(void)
{

  /* USER CODE BEGIN TIM2_Init 0 */

  /* USER CODE END TIM2_Init 0 */

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

  /* USER CODE BEGIN TIM2_Init 1 */

  /* USER CODE END TIM2_Init 1 */
  htim2.Instance = TIM2;
  htim2.Init.Prescaler = 719;
  htim2.Init.CounterMode = TIM_COUNTERMODE_UP;
  htim2.Init.Period = 99;
  htim2.Init.ClockDivision = TIM_CLOCKDIVISION_DIV1;
  htim2.Init.AutoReloadPreload = TIM_AUTORELOAD_PRELOAD_ENABLE;
  if (HAL_TIM_Base_Init(&htim2) != HAL_OK)
  {
    Error_Handler();
  }
  sClockSourceConfig.ClockSource = TIM_CLOCKSOURCE_INTERNAL;
  if (HAL_TIM_ConfigClockSource(&htim2, &sClockSourceConfig) != HAL_OK)
  {
    Error_Handler();
  }
  if (HAL_TIM_PWM_Init(&htim2) != HAL_OK)
  {
    Error_Handler();
  }
  sMasterConfig.MasterOutputTrigger = TIM_TRGO_RESET;
  sMasterConfig.MasterSlaveMode = TIM_MASTERSLAVEMODE_DISABLE;
  if (HAL_TIMEx_MasterConfigSynchronization(&htim2, &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(&htim2, &sConfigOC, TIM_CHANNEL_1) != HAL_OK)
  {
    Error_Handler();
  }
  /* USER CODE BEGIN TIM2_Init 2 */

  /* USER CODE END TIM2_Init 2 */
  HAL_TIM_MspPostInit(&htim2);

}

/**
  * @brief GPIO Initialization Function
  * @param None
  * @retval None
  */
static void MX_GPIO_Init(void)
{
  GPIO_InitTypeDef GPIO_InitStruct = {0};
  /* USER CODE BEGIN MX_GPIO_Init_1 */

  /* USER CODE END MX_GPIO_Init_1 */

  /* GPIO Ports Clock Enable */
  __HAL_RCC_GPIOD_CLK_ENABLE();
  __HAL_RCC_GPIOA_CLK_ENABLE();
  __HAL_RCC_GPIOB_CLK_ENABLE();

  /*Configure GPIO pin Output Level */
  HAL_GPIO_WritePin(GPIOB, GPIO_PIN_8|GPIO_PIN_9, GPIO_PIN_SET);

  /*Configure GPIO pins : PB8 PB9 */
  GPIO_InitStruct.Pin = GPIO_PIN_8|GPIO_PIN_9;
  GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_OD;
  GPIO_InitStruct.Pull = GPIO_NOPULL;
  GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
  HAL_GPIO_Init(GPIOB, &GPIO_InitStruct);

  /* USER CODE BEGIN MX_GPIO_Init_2 */

  /* USER CODE END MX_GPIO_Init_2 */
}

/* 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 */
  __disable_irq();
  while (1)
  {
  }
  /* 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,
     ex: printf("Wrong parameters value: file %s on line %d\r\n", file, line) */
  /* USER CODE END 6 */
}
#endif /* USE_FULL_ASSERT */

实现效果

image

posted @ 2025-08-13 16:19  秦瑞迁  阅读(53)  评论(0)    收藏  举报