STM32单片机利用软件定时器实现分时多任务（使用HAL库编写）
概述
串口1配置（也就是debug串口）
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
/* USER CODE BEGIN 0 */
#include "stdio.h"
/* USER CODE END 0 */
.
.
.
/* USER CODE BEGIN 1 */
#ifdef __GNUC__
#define PUTCHAR_PROTOTYPE int __io_putchar(int ch)
PUTCHAR_PROTOTYPE
{
// 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
HAL_UART_Transmit(&huart1, (uint8_t*)&ch, 1, HAL_MAX_DELAY);
return ch;
}
#endif
/* USER CODE END 1 */
创建software_Time.c文件
/*
* software_Time.c
*
* Created on: 2020年4月10日
* Author: champion
*/
#include "stm32l0xx.h"
#include "software_Time.h"
void SetTime(TIME_TYPE_ST *TimeType,uint32_t TimeInter)
{
TimeType->TimeStart = HAL_GetTick();//获取起始时间
TimeType->TimeInter = TimeInter;//获取间隔时间
}
uint32_t CompareTime(TIME_TYPE_ST *TimeType)//每隔1毫秒，计数器就会增加1
{
return ((HAL_GetTick()-TimeType->TimeStart) >= TimeType->TimeInter);
}
创建software_Time.h文件
/*
* software_Time.h
*
* Created on: 2020年4月10日
* Author: champion
*/
#ifndef INC_SOFTWARE_TIME_H_
#define INC_SOFTWARE_TIME_H_
#include "stdint.h"
typedef struct
{
uint32_t TimeStart;//获取起始时间
uint32_t TimeInter;//间隔时间
}TIME_TYPE_ST;
void SetTime(TIME_TYPE_ST *TimeType,uint32_t TimeInter);//打开超时定时器
uint32_t CompareTime(TIME_TYPE_ST *TimeType);//比较函数
#endif /* INC_SOFTWARE_TIME_H_ */
main.c文件
/* USER CODE END Header */
/* Includes ------------------------------------------------------------------*/
#include "main.h"
#include "usart.h"
#include "gpio.h"
/* Private includes ----------------------------------------------------------*/
/* USER CODE BEGIN Includes */
#include "stdio.h"
#include "software_Time.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 ---------------------------------------------------------*/
/* USER CODE BEGIN PV */
static TIME_TYPE_ST TimeLED;
static TIME_TYPE_ST TimePrint_1;
static TIME_TYPE_ST TimePrint_2;
/* 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 */
/* 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_LPUART1_UART_Init();
MX_USART1_UART_Init();
/* USER CODE BEGIN 2 */
/* USER CODE END 2 */
/* Infinite loop */
/* USER CODE BEGIN WHILE */
while (1)
{
if(CompareTime(&TimeLED))
{
SetTime(&TimeLED, 500); //500ms
HAL_GPIO_TogglePin(LED_GPIO_Port, LED_Pin);
}
if(CompareTime(&TimePrint_1))
{
SetTime(&TimePrint_1, 1000); //1s打印
printf("TimePrint_1s \r\n");
}
if(CompareTime(&TimePrint_2))
{
SetTime(&TimePrint_2, 2000); //2s打印
printf("TimePrint_2s \r\n");
}
/* USER CODE END WHILE */
/* USER CODE BEGIN 3 */
}
/* USER CODE END 3 */
}
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。
作者：Ch_champion
