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
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