实时操作系统实验报告专业：10通信工程学号：20100306110**: ******：***实验一任务管理实验实验目的：1.理解任务管理的基本原理，了解任务的各个基本状态及其变迁过程；2.掌握μC/OS-II 中任务管理的基本方法（挂起、解挂）；3.熟练使用μC/OS-II 任务管理的基本系统调用。

实验要求与思路：为了体现任务的各个基本状态及其变迁过程，本实验设计了T0、T1 和T3三个任务，它们交替运行，如图所示说明：在系统完成初始化后，可以先创建并启动优先级最低的TaskStart，由它创建其他3 个应用任务T0、T1 和T2，之后整个系统的运行流程如下：1）优先级最高的T0 开始执行，之后T0 挂起自己；2）然后系统调度选中T1 开始执行，之后T1 挂起自己；3）接着系统调度选中T2,之后唤醒T0；4）如此循环实验程序:#include "includes.h"#define TASK_STK_SIZE 512OS_STK TaskStk1[TASK_STK_SIZE];OS_STK TaskStk2[TASK_STK_SIZE];OS_STK TaskStk3[TASK_STK_SIZE]; OS_STK TaskStartStk[TASK_STK_SIZE];void Task1(void *data);void Task2(void *data);void Task3(void *data); /* Function prototypes of tasks*\void TaskStart(void *data); /* Function prototypes of Startuptask */static void TaskStartCreateTasks(void);static void TaskStartDispInit(void);void main (void){PC_DispClrScr(DISP_FGND_WHITE + DISP_BGND_BLACK); /* Clear the screen */ OSInit(); /* Initialize uC/OS-II */PC_DOSSaveReturn(); /* Save environment to return to DOS */PC_VectSet(uCOS, OSCtxSw); /* Install uC/OS-II's context switch vector */OSTaskCreate(TaskStart, (void *)0, &TaskStartStk[TASK_STK_SIZE - 1], 0);OSStart(); /* Start multitasking */}void TaskStart (void *pdata){#if OS_CRITICAL_METHOD == 3 /* Allocate storage for CPU status register */OS_CPU_SR cpu_sr;#endifchar s[100];INT16S key;pdata = pdata;TaskStartDispInit(); /* Initialize the display */OS_ENTER_CRITICAL();PC_VectSet(0x08, OSTickISR); /* Install uC/OS-II's clock tick ISR */PC_SetTickRate(OS_TICKS_PER_SEC); /* Reprogram tick rate */ OS_EXIT_CRITICAL();OSStatInit(); /* Initialize uC/OS-II's statistics */OSTaskCreate(Task1, (void *)0, &TaskStk1[TASK_STK_SIZE - 1], 1);OSTaskCreate(Task2, (void *)0, &TaskStk2[TASK_STK_SIZE - 1], 2);OSTaskCreate(Task3, (void *)0, &TaskStk3[TASK_STK_SIZE - 1], 3);OSTaskSuspend(2);/* Prevent compiler warning */OSTaskSuspend(3);for (;;) {if (PC_GetKey(&key) == TRUE) { /* See if key has been pressed */ if (key == 0x1B) { /* Yes, see if it's the ESCAPE key */PC_DOSReturn(); /* Return to DOS */ }}OSCtxSwCtr = 0; /* Clear context switch counter */ OSTimeDly(1);}}static void TaskStartDispInit (void){PC_DispStr( 0, 0, " uC/OS-II, The Real-Time Kernel ", DISP_FGND_WHITE + DISP_BGND_RED + DISP_BLINK);PC_DispStr( 0, 1, " ", DISP_FGND_BLACK + DISP_BGND_LIGHT_GRAY);PC_DispStr( 0, 2, " ", DISP_FGND_BLACK + DISP_BGND_LIGHT_GRAY);PC_DispStr( 0, 3, " Time EXAMPLE ", DISP_FGND_BLACK + DISP_BGND_LIGHT_GRAY);PC_DispStr( 0, 4, " ", DISP_FGND_BLACK + DISP_BGND_LIGHT_GRAY);PC_DispStr( 0, 5, " ", DISP_FGND_BLACK + DISP_BGND_LIGHT_GRAY);PC_DispStr( 0, 6, " ", DISP_FGND_BLACK + DISP_BGND_LIGHT_GRAY);PC_DispStr( 0, 7, " ", DISP_FGND_BLACK + DISP_BGND_LIGHT_GRAY);PC_DispStr( 0, 8, " ", DISP_FGND_BLACK + DISP_BGND_LIGHT_GRAY);PC_DispStr( 0, 9, " ", DISP_FGND_BLACK + DISP_BGND_LIGHT_GRAY);PC_DispStr( 0, 10, " ", DISP_FGND_BLACK + DISP_BGND_LIGHT_GRAY);PC_DispStr( 0, 11, " ", DISP_FGND_BLACK + DISP_BGND_LIGHT_GRAY);PC_DispStr( 0, 12, " ", DISP_FGND_BLACK + DISP_BGND_LIGHT_GRAY);PC_DispStr( 0, 13, " ", DISP_FGND_BLACK + DISP_BGND_LIGHT_GRAY);PC_DispStr( 0, 14, " ", DISP_FGND_BLACK + DISP_BGND_LIGHT_GRAY);PC_DispStr( 0, 15, " ", DISP_FGND_BLACK + DISP_BGND_LIGHT_GRAY);PC_DispStr( 0, 16, " ", DISP_FGND_BLACK + DISP_BGND_LIGHT_GRAY);PC_DispStr( 0, 17, " ", DISP_FGND_BLACK + DISP_BGND_LIGHT_GRAY);PC_DispStr( 0, 18, " ", DISP_FGND_BLACK + DISP_BGND_LIGHT_GRAY);PC_DispStr( 0, 19, " ", DISP_FGND_BLACK + DISP_BGND_LIGHT_GRAY);PC_DispStr( 0, 20, " ", DISP_FGND_BLACK + DISP_BGND_LIGHT_GRAY);PC_DispStr( 0, 21, " ", DISP_FGND_BLACK + DISP_BGND_LIGHT_GRAY);PC_DispStr( 0, 22, " <-PRESS 'ESC' TO QUIT-> ", DISP_FGND_BLACK + DISP_BGND_LIGHT_GRAY + DISP_BLINK);}void Task1 (void *pdata){char ss[30];INT8U err;pdata=pdata;for (;;) {PC_DispStr(40, 10, "Task1 running", DISP_FGND_RED + DISP_BGND_LIGHT_GRAY);PC_DispStr(40, 11, "Task2 Suspend ", DISP_FGND_BLACK + DISP_BGND_LIGHT_GRAY);PC_DispStr(40, 12, "Task3 Suspend ", DISP_FGND_GREEN + DISP_BGND_LIGHT_GRAY);OSTimeDlyHMSM(0, 0, 1, 0); /* Wait one second */ OSTaskResume(2); /* Delay 1 clock tick */ OSTaskSuspend(OS_PRIO_SELF);}}void Task2 (void *pdata){char ss[30];INT8U err;pdata=pdata;for (;;) {PC_DispStr(40, 10, "Task1 Suspend ", DISP_FGND_BLACK + DISP_BGND_LIGHT_GRAY);PC_DispStr(40, 11, "Task2 running ", DISP_FGND_RED + DISP_BGND_LIGHT_GRAY);PC_DispStr(40, 12, "Task3 Suspend ", DISP_FGND_BLACK + DISP_BGND_LIGHT_GRAY); OSTimeDlyHMSM(0, 0, 1, 0); /* Wait one second */ /* Delay 1 clock tick */ OSTaskResume(3); /* Delay 1 clock tick */ OSTaskSuspend(OS_PRIO_SELF);}}void Task3 (void *pdata){char ss[30];INT8U err;pdata=pdata;for (;;) {PC_DispStr(40, 10, "Task1 Suspend ", DISP_FGND_BLACK + DISP_BGND_LIGHT_GRAY);PC_DispStr(40, 11, "Task2 Suspend ", DISP_FGND_BLACK + DISP_BGND_LIGHT_GRAY);PC_DispStr(40, 12, "Task3 running ", DISP_FGND_RED + DISP_BGND_LIGHT_GRAY); OSTimeDlyHMSM(0, 0, 1, 0); /* Wait one second */ /* Delay 1 clock tick */ OSTaskResume(1); /* Delay 1 clock tick */ OSTaskSuspend(OS_PRIO_SELF);}}实验截图：实验感想通过这次实验使我掌握μC/OS-II 中任务管理的基本方法（挂起、解挂），首先在主函数中创建初始任务OSTaskCreate，执行OSTaskCreate后，在调用TaskStartCreateTasks ，在TaskStartCreateTasks实现3 个应用任务T0、T1 和T2循环挂起和唤醒，每个任务运行时要保证其他任务被挂起，而且要在挂起之前唤醒下一个任务。