嵌入式系統實驗報告三

實驗報告三課程名稱嵌入式系統及接口技術實驗名稱信號量管理API應用日期2011-6-17學號0825112028 姓名 余昌潑班級計算機科學與技術B班一.實驗要求：建立一個程序，程序要求如下：創(chuàng)建3個任務，堆棧都為1KB。優(yōu)先級分別為5、8、9.任務運行時在屏幕上打印task?isrunning!!，”？”表示任務的優(yōu)先級。系統中有3個信號量sem1,sem2,sem3.任務5需要獲得semi和sem2后才能打印次信息，打印兀成后釋放兩個信號量。任務8需要獲得semi才能打印一次信息，打印兀成后釋放semi.任務9需要獲得sem2才能打印一次信息，打印兀成后釋放sem2.任務8和任務9每次運行時需要查詢sem3，如果sem3不可用，需要在屏幕上打印信息；如果sem3可用則占用，運行結束后釋放。任務8運行10次后刪除sem3.二.信號量管理API:6個信號量管理API創(chuàng)建信號量OS_EVENT*OSSemCreate(WORDvalue)刪除0S_EVENT*0SSemDel(0S_EVENT*pevent,INT8Uopt,INT8U*err)Opt信號量的刪除條件OS_DEL_NO_PEND:已經沒有任何任務在等待該信號量是，才刪除OS_DEL_ALWAYS不管有沒有任務在等待該信號量，立即刪除。請求信號量voidOSSemPend(OS_EVENT*pevent,INT16Utimeout,INT8U*err)置位信號量INT8UOSSemPost(OS_EVENT*pevent)查詢信號量INT16UOSSemAccept(OSEVENT*pevent)是否就緒或發(fā)生獲取信號量信息INT8UOSSemQuery(OS_EVENT*pevent,OS_SEM_DATA*pdata)多少任務位于等待隊列，信號量的標識號碼三：實驗源代碼：#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.實驗截圖：Task5isrunning?tTask8isrunning! Task9isrunning!!!sen3isnotauailabeinsem3isno