实验报告示例

实时操作系统实验报告

专业：J通信0601

学号：3061109015

姓名:蔡智超

指导老师：李峰

实验二任务管理实验

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:

*********************************************************************************************************

* uC/OS-II

* The Real-Time Kernel

* EX #1 Task Management

*********************************************************************************************************

#include "includes.h"

*********************************************************************************************************

* CONSTANTS

*********************************************************************************************************

#define TASK_STK_SIZE 512 /* Size of each task's stacks (# of WORDs) */

#define N_TASKS 2 /* Number of identical tasks

* VARIABLES

*********************************************************************************************************

OS_STK TaskStk[N_TASKS][TASK_STK_SIZE]; /* Tasks stacks

OS_STK TaskStartStk[TASK_STK_SIZE]; /* TaskStart task stack

INT8U TaskData[N_TASKS]; /* Parameters to pass to each task

* FUNCTION PROTOTYPES

*********************************************************************************************************

void Task0(void *pdata); /* Function prototypes of tasks */

void Task1(void *pdata);

void Task2(void *pdata);

void TaskStart(void *pdata); /* Function prototypes of Startup task */

static void TaskStartCreateTasks(void); /* Function prototypes of creat task */

static void TaskStartDispInit(void); /* Function prototypes of Initialization the display */

/*$PAGE*/* MAIN

**********************************************************************************************************/

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 */

//创建初始任务

OSTaskCreate(TaskStart, (void *)0, &TaskStartStk[TASK_STK_SIZE - 1], 4);

OSStart(); /* Start multitasking */

}

*********************************************************************************************************

* STARTUP TASK

*********************************************************************************************************

void TaskStart (void *pdata)

{

#if OS_CRITICAL_METHOD == 3 /* Allocate storage for CPU status register */

OS_CPU_SR cpu_sr;

#endif

INT16S key;

pdata = pdata; /* Prevent compiler warning */

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 */

TaskStartCreateTasks(); /* Create all the application tasks */

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 */

OSTimeDlyHMSM(0, 0, 1, 0); /* Wait one second */

}

/*$PAGE*/

*********************************************************************************************************

* INITIALIZE THE DISPLAY

*********************************************************************************************************

static void TaskStartDispInit (void)

{

/* 1111111111222222222233333333334444444444555555555566666666667777777777 */

/* 01234567890123456789012345678901234567890123456789012345678901234567890123456789 */

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, " EXAMPLE #1 Task Management ", 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, "Task0() : ", DISP_FGND_BLACK + DISP_BGND_LIGHT_GRAY);

PC_DispStr( 0, 11, "Task1() : ", DISP_FGND_BLACK + DISP_BGND_LIGHT_GRAY);

PC_DispStr( 0, 12, "Task2() : ", 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, " ", DISP_FGND_BLACK + DISP_BGND_LIGHT_GRAY);

PC_DispStr( 0, 23, " ", DISP_FGND_BLACK + DISP_BGND_LIGHT_GRAY);

PC_DispStr( 0, 24, " <-PRESS 'ESC' TO QUIT-> ", DISP_FGND_BLACK + DISP_BGND_LIGHT_GRAY + DISP_BLINK);

/* 1111111111222222222233333333334444444444555555555566666666667777777777 */

/* 01234567890123456789012345678901234567890123456789012345678901234567890123456789 */

}

/*$PAGE*/

*********************************************************************************************************

* CREATE TASKS

*********************************************************************************************************

static void TaskStartCreateTasks (void)

{

INT8U i;

INT8U err;

for (i = 0; i < N_TASKS; i++) { /* Create tasks */

TaskData[i] = i; /* Each task will display its own information */

}

OSTaskCreate(Task0, (void *)&TaskData[0], &TaskStk[0][TASK_STK_SIZE - 1], 5);

OSTaskCreate(Task1, (void *)&TaskData[1], &TaskStk[1][TASK_STK_SIZE - 1], 6);

OSTaskCreate(Task2, (void *)&TaskData[2], &TaskStk[2][TASK_STK_SIZE - 1], 7);

err=OSTaskSuspend(6); /* 确保每个任务运行时其他任务被挂起

err=OSTaskSuspend(7);

}

/*$PAGE*/

*********************************************************************************************************

* TASK #0

* Description: This task is suspended by itself,then it will be resumed by other tasks.

*********************************************************************************************************

void Task0 (void *pdata)

{

INT8U i;

INT8U err;

i=*(int *)pdata;

for (;;) {

PC_DispStr( 14, 10, "task0 is running. ", DISP_FGND_BLACK + DISP_BGND_LIGHT_GRAY);

PC_DispStr( 14, 11, "task1 is suspended. ", DISP_FGND_BLACK + DISP_BGND_LIGHT_GRAY);

PC_DispStr( 14, 12, "task2 is suspended. ", DISP_FGND_BLACK + DISP_BGND_LIGHT_GRAY);

OSTimeDly(200);

err=OSTaskResume(6);

err=OSTaskSuspend(5); /* suspend itself */

}

/*$PAGE*/

*********************************************************************************************************

* TASK #1

* Description: This task resume task0

void Task1 (void *pdata)

{

INT8U i;

INT8U err;

i=*(int *)pdata;

for (;;) {

OSTimeDly(200);

PC_DispStr( 14, 10, "task0 is suspended. ", DISP_FGND_BLACK + DISP_BGND_LIGHT_GRAY);

PC_DispStr( 14, 11, "task1 is running. ", DISP_FGND_BLACK + DISP_BGND_LIGHT_GRAY);

PC_DispStr( 14, 12, "task2 is suspended. ", DISP_FGND_BLACK + DISP_BGND_LIGHT_GRAY);

OSTimeDly(200);

err=OSTaskResume(7); /* resume task0 */

err=OSTaskSuspend(6);

}

/*$PAGE*/

*********************************************************************************************************

* TASK #2

* Description: This task resume task0

*********************************************************************************************************

void Task2 (void *pdata)

{

INT8U i;

INT8U err;

i=*(int *)pdata;

for (;;) {

OSTimeDly(200);

PC_DispStr( 14, 10, "task0 is suspended. ", DISP_FGND_BLACK + DISP_BGND_LIGHT_GRAY);

PC_DispStr( 14, 11, "task1 is suspended. ", DISP_FGND_BLACK + DISP_BGND_LIGHT_GRAY);

PC_DispStr( 14, 12, "task2 is running. ", DISP_FGND_BLACK + DISP_BGND_LIGHT_GRAY);

OSTimeDly(200);

err=OSTaskResume(5); /* resume task0 */

err=OSTaskSuspend(7);

}

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。显示设置可以修改TaskStartDispInit函数或者在Task0 Task1 Task2修改。

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