概述
很多时候，应用场景，是需要分时处理各个事件。本文章就编写点亮LED与打印输出的示例来讲解使用方法。在这直接进入正题。（在此不做创建项目的步骤介绍）
1、STM32CubeIDE 配置
- LED管脚配置
- 串口1配置（也就是debug串口）
2、代码
- usart.c文件
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/* USER CODE BEGIN 0 */
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#include "stdio.h"
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/* USER CODE END 0 */
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.
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.
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.
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/* USER CODE BEGIN 1 */
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#ifdef __GNUC__
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#define PUTCHAR_PROTOTYPE int __io_putchar(int ch)
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PUTCHAR_PROTOTYPE
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{
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// 注意下面第一个参数是&huart1，因为cubemx配置了串口1自动生成的
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HAL_UART_Transmit(&huart1, ( uint8_t*)&ch, 1, HAL_MAX_DELAY);
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return ch;
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}
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#endif
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/* USER CODE END 1 */
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- 创建software_Time.c文件
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/*
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* software_Time.c
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*
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* Created on: 2020年4月10日
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* Author: champion
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*/
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#include "stm32l0xx.h"
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#include "software_Time.h"
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void SetTime(TIME_TYPE_ST *TimeType,uint32_t TimeInter)
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{
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TimeType->TimeStart = HAL_GetTick(); //获取起始时间
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TimeType->TimeInter = TimeInter; //获取间隔时间
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}
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uint32_t CompareTime(TIME_TYPE_ST *TimeType) //每隔1毫秒，计数器就会增加1
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{
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return ((HAL_GetTick()-TimeType->TimeStart) >= TimeType->TimeInter);
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}
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- 创建software_Time.h文件
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/*
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* software_Time.h
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*
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* Created on: 2020年4月10日
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* Author: champion
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*/
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#ifndef INC_SOFTWARE_TIME_H_
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#define INC_SOFTWARE_TIME_H_
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#include "stdint.h"
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typedef struct
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{
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uint32_t TimeStart; //获取起始时间
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uint32_t TimeInter; //间隔时间
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}TIME_TYPE_ST;
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void SetTime(TIME_TYPE_ST *TimeType,uint32_t TimeInter); //打开超时定时器
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uint32_t CompareTime(TIME_TYPE_ST *TimeType); //比较函数
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#endif /* INC_SOFTWARE_TIME_H_ */
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- main.c文件
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/* USER CODE END Header */
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/* Includes ------------------------------------------------------------------*/
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#include "main.h"
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#include "usart.h"
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#include "gpio.h"
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/* Private includes ----------------------------------------------------------*/
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/* USER CODE BEGIN Includes */
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#include "stdio.h"
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#include "software_Time.h"
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/* USER CODE END Includes */
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/* Private typedef -----------------------------------------------------------*/
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/* USER CODE BEGIN PTD */
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/* USER CODE END PTD */
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/* Private define ------------------------------------------------------------*/
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/* USER CODE BEGIN PD */
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/* USER CODE END PD */
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/* Private macro -------------------------------------------------------------*/
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/* USER CODE BEGIN PM */
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/* USER CODE END PM */
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/* Private variables ---------------------------------------------------------*/
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/* USER CODE BEGIN PV */
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static TIME_TYPE_ST TimeLED;
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static TIME_TYPE_ST TimePrint_1;
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static TIME_TYPE_ST TimePrint_2;
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/* USER CODE END PV */
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/* Private function prototypes -----------------------------------------------*/
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void SystemClock_Config(void);
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/* USER CODE BEGIN PFP */
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/* USER CODE END PFP */
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/* Private user code ---------------------------------------------------------*/
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/* USER CODE BEGIN 0 */
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/* USER CODE END 0 */
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/**
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* @brief The application entry point.
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* @retval int
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*/
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int main(void)
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{
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/* USER CODE BEGIN 1 */
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/* USER CODE END 1 */
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/* MCU Configuration--------------------------------------------------------*/
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/* Reset of all peripherals, Initializes the Flash interface and the Systick. */
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HAL_Init();
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/* USER CODE BEGIN Init */
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/* USER CODE END Init */
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/* Configure the system clock */
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SystemClock_Config();
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/* USER CODE BEGIN SysInit */
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/* USER CODE END SysInit */
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/* Initialize all configured peripherals */
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MX_GPIO_Init();
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MX_LPUART1_UART_Init();
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MX_USART1_UART_Init();
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/* USER CODE BEGIN 2 */
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/* USER CODE END 2 */
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/* Infinite loop */
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/* USER CODE BEGIN WHILE */
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while ( 1)
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{
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if(CompareTime(&TimeLED))
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{
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SetTime(&TimeLED, 500); //500ms
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HAL_GPIO_TogglePin(LED_GPIO_Port, LED_Pin);
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}
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if(CompareTime(&TimePrint_1))
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{
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SetTime(&TimePrint_1, 1000); //1s打印
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printf( "TimePrint_1s \r\n");
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}
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if(CompareTime(&TimePrint_2))
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{
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SetTime(&TimePrint_2, 2000); //2s打印
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printf( "TimePrint_2s \r\n");
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}
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/* USER CODE END WHILE */
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/* USER CODE BEGIN 3 */
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}
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/* USER CODE END 3 */
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}
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- 运行效果
总结：通过结果可以看出，是可以模拟出多任务处理的机制，其实也就是时间片轮法形式的多线程任务。
转载：https://blog.csdn.net/qq_36075612/article/details/105432947
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