📄 task.c
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/*
*********************************************************************************************************
* uC/OS-II
* The Real-Time Kernel
*
*
*
* EXAMPLE #1 Task Management
*********************************************************************************************************
*/
#include "C:\SOFTWARE\uCOS-II\Task Management\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 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 */
static void Disp(INT8U); /* Function prototypes of displaying the information of task */
/*$PAGE*/
/*
*********************************************************************************************************
* MAIN
*********************************************************************************************************
*/
void main (void)
{
PC_DispClrScr(DISP_FGND_WHITE + DISP_BGND_BLACK); /* Clear the screen */
OSInit(); /* Initialize uC/OS-II */
PC_DOSSaveReturn(); /* Save environment to return to DOS */
PC_VectSet(uCOS, OSCtxSw); /* Install uC/OS-II's context switch vector */
OSTaskCreate(TaskStart, (void *)0, &TaskStartStk[TASK_STK_SIZE - 1], 4);
OSStart(); /* Start multitasking */
}
/*
*********************************************************************************************************
* STARTUP TASK
*********************************************************************************************************
*/
void TaskStart (void *pdata)
{
#if OS_CRITICAL_METHOD == 3 /* Allocate storage for CPU status register */
OS_CPU_SR cpu_sr;
#endif
INT16S key;
pdata = pdata; /* Prevent compiler warning */
TaskStartDispInit(); /* Initialize the display */
OS_ENTER_CRITICAL();
PC_VectSet(0x08, OSTickISR); /* Install uC/OS-II's clock tick ISR */
PC_SetTickRate(OS_TICKS_PER_SEC); /* Reprogram tick rate */
OS_EXIT_CRITICAL();
OSStatInit(); /* Initialize uC/OS-II's statistics */
TaskStartCreateTasks(); /* Create all the application tasks */
for (;;) {
if (PC_GetKey(&key) == TRUE) { /* See if key has been pressed */
if (key == 0x1B) { /* Yes, see if it's the ESCAPE key */
PC_DOSReturn(); /* Return to DOS */
}
}
OSCtxSwCtr = 0; /* Clear context switch counter */
OSTimeDlyHMSM(0, 0, 1, 0); /* Wait one second */
}
}
/*$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, " ", 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 */
}
/*$PAGE*/
/*
*********************************************************************************************************
*
*********************************************************************************************************
* CREATE TASKS
*********************************************************************************************************
*/
static void TaskStartCreateTasks (void)
{
INT8U i;
for (i = 0; i < N_TASKS; i++) { /* Create tasks */
TaskData[i] = i; /* Each task will display its own information */
}
OSTaskCreate(Task0, (void *)&TaskData[0], &TaskStk[0][TASK_STK_SIZE - 1], 5);
OSTaskCreate(Task1, (void *)&TaskData[1], &TaskStk[1][TASK_STK_SIZE - 1], 6);
}
/*$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 (;;) {
Disp(i);
err=OSTaskSuspend(5); /* suspend itself */
}
}
/*$PAGE*/
/*
*********************************************************************************************************
* TASK #1
*
* Description: This task resume task0
*********************************************************************************************************
*/
void Task1 (void *pdata)
{
INT8U i;
INT8U err;
i=*(int *)pdata;
for (;;) {
OSTimeDly(200);
Disp(i);
err=OSTaskResume(5); /* resume task0 */
}
}
/*$PAGE*/
/*
*********************************************************************************************************
* Disp the task information
*
*********************************************************************************************************
*/
static void Disp (INT8U data)
{
switch(data){
case 0:
{
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);
OSTimeDly(200);
}
case 1:
{
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);
OSTimeDly(200);
}
}
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