www.pudn.com > MiniOS.rar > ex12.c

// 
// Example 12 This program show how to suspend task ans resume task 
// Author Taiyun Wnag  
// data:2003/2/22 
/////////////////////////////////////////////////////////////////////////// 
 
 
#include "sposvar.h" 
#include "spos.h" 
 
int err;				//Error No 
int t1stack[25];		//Task 1 stack 
int t2stack[25];		//Task 2 stack 
 
volatile unsigned int *P_IOB_BUFFER =(unsigned int*)(0x7006);	//Port B data register 
volatile unsigned int *P_IOB_DIR =(unsigned int*)(0x7007);		//Port B direction register 
volatile unsigned int *P_IOB_ATTRIB = (unsigned int*)(0x7008);	//Port B attribute register 
 
main() 
{ 
	void Task1(); 
    void Task2(); 
	SpSInit();									//Initialize OS kernel 
   *P_IOB_DIR = 0XFFFF;							//Set Port B direction 
   *P_IOB_ATTRIB = 0XFFFF;						//Set Port B attribute 
	err = SpSTaskCreate(Task1,0,t1stack+24,1);	//Create first task 
	err = SpSTaskCreate(Task2,0,t2stack+24,2);	//create second task 
	SpSStart();									//Start multitask kernel 
} 
void Task1() 
{ 
    unsigned int i = 1; 
	while(1) { 
		SpSTimeDly(11);							//Delay 11 tick 
		SpSTaskSuspend(2);						//Suspend task 2 
		SpSTimeDly(17);							//Delay 17 tick 
		SpSTaskResume(2);						//Resume task 2 
	} 
} 
void Task2() 
{ 
	unsigned int i = 0x80; 
	while(1) { 
		for(i = 0x80;i != 0;i>>=1) { 
            *P_IOB_BUFFER = i; 
            SpSTimeDly(1); 
		} 
	} 
}