基于STM32的虛擬多線程，可以很好的用于裸機程序中，用于模擬小型操作系統的多線程概念。本實例參考了參考TI_BLE協議棧_ZStack協議棧。

#include "Hal_Led/Hal_Led.h"

#include "Hal_delay/delay.h"

#include "Hal_Key/Hal_Key.h"

#include "ringbuffer.h"

#define APP_LED2_BLINK_EVENT ? 0x0001

#define HAL_LED1_BLINK_EVENT ? 0x0001

#define TASK_NO_TASK_RUNNING ? ? ?0xFF

unsigned short Hal_ProcessEvent( unsigned char task_id, unsigned short events );

unsigned short App_ProcessEvent( unsigned char task_id, unsigned short events );

typedef unsigned short ?uint16;

typedef unsigned char ? uint8;

#define TASK_CNT ?2 ? ?//定義線程的個數

//定義函數指針

typedef unsigned short (*pTaskEventHandlerFn)( unsigned char task_id, unsigned short events );

//線程函數表

const pTaskEventHandlerFn tasksArr[] =

{

Hal_ProcessEvent,

App_ProcessEvent

};

const unsigned char tasksCnt = sizeof( tasksArr ) / sizeof( tasksArr[0] );

//uint16 *tasksEvents;

uint16 tasksEvents[TASK_CNT] = {0}; ?//每個線程有16位位域空間用于設置事件

static uint8 activeTaskID = 0xFF; ?//當前任務ID，指示作用

#define SUCCESS ? ? ? ? ? ? ? ? ? 0x00

#define FAILURE ? ? ? ? ? ? ? ? ? 0x01

#define INVALID_TASK ? ? ? ? ? ? ?0x02

uint8 osal_set_event( uint8 task_id, uint16 event_flag )

{

if ( task_id < tasksCnt )

{

tasksEvents[task_id] |= event_flag; ?// Stuff the event bit(s)

return ( SUCCESS );

}

else

{

return ( INVALID_TASK );

}

}

/**

* @brief 程序入口

* @param none

* @return none

*/

int main(void)

{

unsigned short taskID = 0;

uint8 idx = 0;

SystemInit(); ?//系統時鐘初始化

delayInit(72); //滴答定時器初始化

Led_Init(); ? ?//LED初始化

NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);

osal_set_event(0, HAL_LED1_BLINK_EVENT);

osal_set_event(1, APP_LED2_BLINK_EVENT);

while(1)

{

do

{

if(tasksEvents[idx]) ?//輪訓獲知哪個線程有事件需要進行處理

{

break;

}

}

while (++idx < tasksCnt);

if (idx < tasksCnt)

{

uint16 events;

events = tasksEvents[idx];

tasksEvents[idx] = 0; ? ? ? ? ? ? ? ? ? ?// 清除事件數組中的事件

activeTaskID = idx;

events = (tasksArr[idx])( idx, events ); //調用線程函數

activeTaskID = TASK_NO_TASK_RUNNING;

tasksEvents[idx] |= events; ?// 添加未處理的事件到本線程的事件組中

}

delayMs(1000);

}

}

/**

* @brief 應用層處理

* @param none

* @r

*/

unsigned short Hal_ProcessEvent( unsigned char task_id, unsigned short events )

{

if ( events & HAL_LED1_BLINK_EVENT )

{

Led_Reverse(1);

return events ^ HAL_LED1_BLINK_EVENT; ?//清除事件

}

}

/**

* @brief 硬件控制線程

* @param none

* @r

*/

unsigned short App_ProcessEvent( unsigned char task_id, unsigned short events )

{

if ( events & APP_LED2_BLINK_EVENT )

{

Led_Reverse(2);

return events ^ APP_LED2_BLINK_EVENT; ?//清除事件