基于STM32的虚拟多线程

基于STM32的虚拟多线程，可以很好的用于裸机程序中，用于模拟小型操作系统的多线程概念。本实例参考了参考TI_BLE协议栈_ZStack协议栈。

#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    //定义线程的个数

//定义函数指针

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

//线程函数表

const pTaskEventHandlerFn tasksArr[] =

{

    Hal_ProcessEvent,

    App_ProcessEvent

};

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

//uint16 *tasksEvents;

uint16 tasksEvents[TASK_CNT] = {0};  //每个线程有16位位域空间用于设置事件

static uint8 activeTaskID = 0xFF;  //当前任务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();  //系统时钟初始化

    delayInit(72); //滴答定时器初始化

    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])  //轮训获知哪个线程有事件需要进行处理

            {

                break;

            }

        }

        while (++idx < tasksCnt);

        if (idx < tasksCnt)

        {

            uint16 events;

            events = tasksEvents[idx];

            tasksEvents[idx] = 0;                    // 清除事件数组中的事件

            activeTaskID = idx;

            events = (tasksArr[idx])( idx, events ); //调用线程函数

            activeTaskID = TASK_NO_TASK_RUNNING;

            tasksEvents[idx] |= events;  // 添加未处理的事件到本线程的事件组中

        }

        delayMs(1000);

    }

}

/**

* @brief 应用层处理

* @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 硬件控制线程

* @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

    }

}