定时器&PWM应用编程

一、定时器计数控制LED

1.1创建项目

随机选择一个管脚控制OLED

1.2代码

添加中断回调处理函数

void HAL_TIM_PeriodElapsedCallback(TIM_HandleTypeDef *htim){
	static uint32_t time_cnt = 0;
	if(htim->Instance == TIM2){
		if(++time_cnt >= 400){
			time_cnt = 0;
			HAL_GPIO_TogglePin(GPIOA, GPIO_PIN_4);
		}
	}
}

1.3效果

二、定时器pwm模式呼吸灯

2.1创建工程

2.2代码

main.c中

```c
/* USER CODE BEGIN Header */
/**
  ******************************************************************************
  * @file           : main.c
  * @brief          : Main program body
  ******************************************************************************
  * @attention
  *
  * Copyright (c) 2023 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"
#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
  */
  uint16_t duty_num3 = 10;
uint16_t duty_num4 = 10;
 
 
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_TIM3_Init();
  MX_TIM4_Init();
  	HAL_TIM_PWM_Start(&htim3,TIM_CHANNEL_1);
	HAL_TIM_PWM_Start(&htim4,TIM_CHANNEL_1);
 
  /* USER CODE BEGIN 2 */
 
  /* USER CODE END 2 */
 
  /* Infinite loop */
  /* USER CODE BEGIN WHILE */
  while (1)
  {
    /* USER CODE END WHILE */
        HAL_Delay(50);
		duty_num3 = duty_num3 + 10;
			duty_num4 = duty_num4 + 10;
		if(duty_num3 > 500)
		{
			duty_num3 = 0;
		}
		__HAL_TIM_SetCompare(&htim3,TIM_CHANNEL_1,duty_num3);
			if(duty_num4 > 500)
		{
			duty_num4 = 0;
		}
		__HAL_TIM_SetCompare(&htim4,TIM_CHANNEL_1,duty_num4);
    /* 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();
  }
}
 
/* 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 */

2.3结果

2.4波形图

三、串口显示周期脉宽

3.1工程创建

3.2代码

回调函数

void HAL_TIM_IC_CaptureCallback(TIM_HandleTypeDef *htim){
	if(htim->Instance == TIM1) //ÅжϷ¢Éú²¶»ñÖжϵĶ¨Ê±Æ÷
	{
		if(htim->Channel == HAL_TIM_ACTIVE_CHANNEL_1) //Åжϲ¶»ñ·¢ÉúͨµÀ
		{
			if(CapIndex == 0){
				CapVal1 = HAL_TIM_ReadCapturedValue(htim, TIM_CHANNEL_1);
				printf("CapVal1: %d\r\n",CapVal1);
				CapIndex = 1;
			}else if(CapIndex == 1){
				CapVal2 = HAL_TIM_ReadCapturedValue(htim, TIM_CHANNEL_1);
				printf("CapVal2: %d\r\n",CapVal2);
				HAL_TIM_IC_Stop(htim, TIM_CHANNEL_1);
				CapIndex = 0;
				MeasureFlag = 1;
			}else{
				Error_Handler();
			}
		}
	}
}

while

while (1)
  {
    /* USER CODE END WHILE */
	  if(MeasureFlag == 1){
		  if(CapVal1>=CapVal2){
			Diff = CapVal2-CapVal1;
		  }else{
			  Diff = ((10000-CapVal1)+CapVal2);
		  }
		  printf("Period is:%.4fms\r\n",Diff/1.0);
		  MeasureFlag = 0;
		  HAL_Delay(1000);
		  HAL_TIM_IC_Start(&htim1, TIM_CHANNEL_1);
	  }
	  
	  //printf("Period is:%.4fms\r\n",Diff/1.0);
    /* USER CODE BEGIN 3 */
  }

3.3效果