嵌入式系统实验报告三

实验报告三课程名称嵌入式系统及接口技术实验名称信号量管理API应用日期2011-6-17学号0825112028 姓名 余昌泼班级计算机科学与技术B班一.实验要求：建立一个程序，程序要求如下：创建3个任务，堆栈都为1KB。优先级分别为5、8、9.任务运行时在屏幕上打印task?isrunning!!，”？”表示任务的优先级。系统中有3个信号量sem1,sem2,sem3.任务5需要获得semi和sem2后才能打印次信息，打印兀成后释放两个信号量。任务8需要获得semi才能打印一次信息，打印兀成后释放semi.任务9需要获得sem2才能打印一次信息，打印兀成后释放sem2.任务8和任务9每次运行时需要查询sem3，如果sem3不可用，需要在屏幕上打印信息；如果sem3可用则占用，运行结束后释放。任务8运行10次后删除sem3.二.信号量管理API:6个信号量管理API创建信号量OS_EVENT*OSSemCreate(WORDvalue)删除0S_EVENT*0SSemDel(0S_EVENT*pevent,INT8Uopt,INT8U*err)Opt信号量的删除条件OS_DEL_NO_PEND:已经没有任何任务在等待该信号量是，才删除OS_DEL_ALWAYS不管有没有任务在等待该信号量，立即删除。请求信号量voidOSSemPend(OS_EVENT*pevent,INT16Utimeout,INT8U*err)置位信号量INT8UOSSemPost(OS_EVENT*pevent)查询信号量INT16UOSSemAccept(OSEVENT*pevent)是否就绪或发生获取信号量信息INT8UOSSemQuery(OS_EVENT*pevent,OS_SEM_DATA*pdata)多少任务位于等待队列，信号量的标识号码三：实验源代码：#include"includes.h"#defineTASK_STK_SIZE1024OS_STKTask_5_stk[TASK_STK_SIZE];OS_STKTask_8_stk[TASK_STK_SIZE];OS_STKTask_9_stk[TASK_STK_SIZE];OS_EVENT*sem1;OS_EVENT*sem2;OS_EVENT*sem3;voidTask5(void*pdata);voidTask8(void*pdata);voidTask9(void*pdata);voidmain(void){PC_DispClrScr(DISP_FGND_WHITE+DISP_BGND_BLACK);OSInit();PC_DOSSaveReturn();PC_VectSet(uCOS,OSCtxSw);seml=OSSemCreate(l);sem2=OSSemCreate(l);sem3=OSSemCreate(1);OSTaskCreate(Task5,(void*)0,&Task_5_stk[TASK_STK_SIZE-1],5);OSTaskCreate(Task8,(void*)0,&Task_8_stk[TASK_STK_SIZE-1],8);OSTaskCreate(Task9,(void*)0,&Task_9_stk[TASK_STK_SIZE-1],9);OSStart();}voidTask5(void*pdata){INT8Ujudge;INT8Uerr;INT16Skey;INT8Ux=1;INT8Uy=1;OS_ENTER_CRITICAL();PC_VectSet(0x08,OSTickISR);PC_SetTickRate(OS_TICKS_PER_SEC);OS_EXIT_CRITICAL();for(;;){〃PC_DispClrScr(DISP_FGND_WHITE+DISP_BGND_BLACK);OSSemPend(sem1,0,&err);isOSSemPend(sem2,0,&err);isPC_DispStr(x,y,"Task 5running!!",DISP_FGND_WHITE+DISP_BGND_RED+DISP_BLINK);OSSemPost(sem2);OSSemPost(sem1);//x=(x+1)%(80-12);y=y+2;//y=(y+1)%(25-1);if(PC_GetKey(&key)==TRUE){if(key==0x1B){PC_DOSReturn();}}OSCtxSwCtr=0;

OSTimeDlyHMSM(0,0,2,350);}}voidTask8(void*pdata){INT8Ux=22;INT8Uy=1;INT8Ujudge;INT8Uerr;INT16Skey;INT8Uvalue;INT8Uschtime=l;〃OSTimeDlyHMSM(0,0,l,0);OS_ENTER_CRITICAL();PC_VectSet(0x08,OSTickISR);PC_SetTickRate(OS_TICKS_PER_SEC);OS_EXIT_CRITICAL();for(;;schtime++){if(schtime=10){OSSemPost(sem3);inOSSemDel(sem3,OS_DEL_NO_PEND,&err);inPC_DispStr(&9,"sem3 is delatetask8!!!",DISP_FGND_WHITE+DISP_BGND_RED+DISP_BLINK);}value=OSSemAccept(sem3);if(value=0)in{inPC_DispStr(x,y+2,"sem3 is not availabetask8!!!",DISP_FGND_WHITE+DISP_BGND_RED+DISP_BLINK);}else{OSSemPost(sem3);}is〃PC_DispClrScr(DISP_FGND_WHITE+DISP_BGND_BLACK);OSSemPend(sem1,0,&err);isPC_DispStr(x,y,"Task 8running!!!",DISP_FGND_WHITE+DISP_BGND_GREEN+DISP_BLINK);OSSemPost(sem1);// x=(x+1)%(80-12);y=y+2;//y=(y+1)%(25-1);if(PC_GetKey(&key)==TRUE){if(key==0x1B){PCDOSReturn();

}}OSCtxSwCtr=0;OSTimeDlyHMSM(0,0,2,350);}}voidTask9(void*pdata){INT8Ujudge;INT8Uerr;INT16Skey;INT8Ux=45;INT8Uy=1;INT8Uvalue=1;//OSTimeDlyHMSM(0,0,l,350);OS_ENTER_CRITICAL();PC_VectSet(0x08,OSTickISR);PC_SetTickRate(OS_TICKS_PER_SEC);OS_EXIT_CRITICAL();for(;;){value=OSSemAccept(sem3);if(value=0)in{inPC_DispStr(x,y+2,"sem3 is not availabetask9!!!",DISP_FGND_WHITE+DISP_BGND_BLUE+DISP_BLINK);}else{OSSemPost(sem3);}is〃PC_DispClrScr(DISP_FGND_WHITE+DISP_BGND_BLACK);OSSemPend(sem2,0,&err);isPC_DispStr(x,y,"Task 9running!!!",DISP_FGND_WHITE+DISP_BGND_RED+DISP_BLINK);OSTimeDlyHMSM(0,0,2,350);OSSemPost(sem2);// x=(x+1)%(80-12);y=y+2;//y=(y+1)%(25-1);if(PC_GetKey(&key)==TRUE){if(key==0x1B){PC_DOSReturn();}OSCtxSwCtr=0;OSTimeDlyHMSM(0,0,2,350);}}四.实验截图：Task5isrunning?tTask8isrunning! Task9isrunning!!!sen3isnotauailabeinsem3isno