以下是我修改的程序,在mytask中添加了一个延时,我认为应该先显示mytask calling fun(),然后过8s之后再显示youtask calling fun(),可是
实际上是,显示mytask calling fun()之后紧接着显示八个youtask calling fun()然后是mytask callingfun()
请问这是为什么呢?
#include "INCLUDES.h"
#define TASK_STK_SIZE 512
char *s1="MyTask";
char *s2="YouTask";
INT8U err;
INT8U y=0;
OS_EVENT *Fun_Semp;
OS_STK StartTaskStk[TASK_STK_SIZE];
OS_STK MyTaskStk[TASK_STK_SIZE];
OS_STK YouTaskStk[TASK_STK_SIZE];
void Fun(INT8U x,INT8U y);
void StartTask(void *data);
void MyTask(void *data);
void YouTask(void *data);
/*
*********************************************************************************************************
* MAIN主函数
*********************************************************************************************************
*/
void main (void)
{
Fun_Semp=OSSemCreate(1); //定义信号量
OSInit();
PC_DOSSaveReturn();
PC_VectSet(uCOS, OSCtxSw);
OSTaskCreate(StartTask,(void *)0, &StartTaskStk[TASK_STK_SIZE - 1], 0); //创建起始函数
OSStart(); /* 启动多任务管理 */
}
void StartTask(void *pdata)
{
#if OS_CRITICAL_METHOD == 3 /* Allocate storage for CPU status register */
OS_CPU_SR cpu_sr;
#endif
INT16S key; /*用于退出的建*/
pdata = pdata; /* Prevent compiler warning */
OS_ENTER_CRITICAL();
PC_VectSet(0x08, OSTickISR);
PC_SetTickRate(OS_TICKS_PER_SEC);
OS_EXIT_CRITICAL();
OSStatInit(); /* 初始化统计任务 */
OSTaskCreate(MyTask,(void *)0, &MyTaskStk[TASK_STK_SIZE - 1], 1); //创建任务函数
OSTaskCreate(YouTask,(void *)0, &YouTaskStk[TASK_STK_SIZE - 1], 2); //创建任务函数
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 */
}
}
OSTimeDlyHMSM(0,0,3,0); /* 等待3S*/
}
}
void MyTask(void *pdata)
{
#if OS_CRITICAL_METHOD == 3 /* Allocate storage for CPU status register */
OS_CPU_SR cpu_sr;
#endif
pdata = pdata; /* Prevent compiler warning */
for (;;)
{
OSSemPend(Fun_Semp,0,&err); //请求信号量
PC_DispStr(0,y++,s1,DISP_BGND_BLACK+DISP_FGND_WHITE);
Fun(7,y);
//#############################################################################
OSTimeDlyHMSM(0,0,8,0); /* 等待8S*/
//#############################################################################
OSSemPost(Fun_Semp); //发送信号量
OSTimeDlyHMSM(0,0,1,0); /* 等待1S*/
}
}
void YouTask(void *pdata)
{
#if OS_CRITICAL_METHOD == 3 //Allocate storage for CPU status register
OS_CPU_SR cpu_sr;
#endif
pdata=pdata;
for (;;)
{
OSSemPend(Fun_Semp,0,&err); //请求信号量
PC_DispStr(0,y++,s2,DISP_BGND_BLACK+DISP_FGND_WHITE);
Fun(7,y);
OSSemPost(Fun_Semp);
OSTimeDlyHMSM(0,0,1,0); //等待10个时钟节拍
}
}
void Fun(INT8U x,INT8U y)
{
PC_DispStr(x,y-1," Calling FUN()",DISP_BGND_BLACK+DISP_FGND_WHITE);
}