//
// example 3: semaphore
// descriptions: The first task turned on LEDs from left to right,moved slowly until the eighth LED lighten,
//               then the second task started up , it turned on LEDs from right to left,moved fleetly
//               until the first LED lighten,and then the first task started up again.The program repeat endless.
// author: Taiyun Wang 
// date: 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
HEvent sem;						//Event handle

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();								
	SpSInit();									//Initialize OS kernel
   *P_IOB_DIR = 0XFFFF;							//Set port B direction
   *P_IOB_ATTRIB = 0XFFFF;						//Set prot B attribute
	err = SpSTaskCreate(Task1,0,t1stack+24,1);	//Create first task
	sem = SpSSemCreate(1);						//Create a semaphone
	SpSStart();									//Start kernel
}
void Task1()					//task 1
{
    void Task2();
    unsigned int i = 1;
	err = SpSTaskCreate(Task2,0,t2stack+24,2);	//Create second task
	while(1) {
        SpSSemPend(sem,0);						// Waiting semaphone
		for(i = 1;i<0x100;i<<=1) {
			*P_IOB_BUFFER = i;
			SpSTimeDly(30);						//Delay 30 tick
		}
        SpSSemPost(sem);						//Release semaphone
	}
}

void Task2()					//task 2
{
	volatile unsigned int *P_IOB_DATA = (unsigned int*)(0x7005);
	unsigned int i = 0x80;
	while(1) {
        SpSSemPend(sem,0);						//Waiting semaphone
		for(i = 0x80;i != 0;i>>=1) {
            *P_IOB_BUFFER = i;
            SpSTimeDly(5);						//Delay 5 tick
		}
        SpSSemPost(sem);						//Release semaphone
 	}
}