//PORTC=0B 0 0 X1 V1 D1 X2 V2 D2;
//PORTB=LED7SEG duong 1;
//PORTD=LED7SEG duong 2;
//PM : MPLAB + MCC18 + PROTEUS 8.6 ;
//Dung pic18f4520
// l------x1=20s-----l--v1=3s--l----------------------d1=30s-------------------l;
// l------------d2=23s------------l----------------x2=27s------------l--v2=3s--l;
// d2=x1+v1; d1=x2+v2;
// cac so trong ctrinh chi la lay vi du;
#include <P18f4520.h>
#include <delays.h>
#include <stdio.h>

#pragma config OSC = HS
#pragma config MCLRE = ON
#pragma config WDT = OFF

int x=53;
signed char i,j,tt,led0,led1,led2,led3;
unsigned char so[] ={0xc0,0xf9,0xA4,0xB0,0x99,0x92,0x82,0xf8,0x80,0x90,0xff};
char m[10];

void giai_ma()
{ 
	led0=so[i/10];
	led1=so[i%10];
	led2=so[j/10];
	led3=so[j%10];
}

void hien_thi()
{
	giai_ma();
	PORTB=led0; PORTD=led2; PORTA=0b00001010; Delay1KTCYx(50); PORTA=0x0f;
	PORTB=led1; PORTD=led3; PORTA=0b00000101; Delay1KTCYx(50); PORTA=0x0f;
}

void delay_hienthi(unsigned int h)
{ 
	unsigned int l;
	for(l=0;l<h;l++)
	{ 
		hien_thi();
	}
}

void den_nga_4()
{
		if(x<=0)
			x=53;
		else
			x--;
		if (x>33)
		{
			PORTC=0b00100001; //den x1 va d2 sang
			i=x-34;		//den x1 sang 20s
			j=x-31;		//den d2 sang 23s
			delay_hienthi(10);
		}
		else if (x>30)
		{
			PORTC=0b00100010; //den v1 va d2 sang
			i=x-31;		//den v1 sang 3s
			j=x-31;		//den d2 sang 23s
			delay_hienthi(10);
		}
		else if (x>3)
		{
			PORTC=0b00001100; //den d1 va x2 sang
			i=x-1;		//den d1 sang 30s
			j=x-4;		//den x2 sang 20s
			delay_hienthi(10);
		}
		else if (x>0)
		{
			PORTC=0b00010100; //den v1 va d2 sang
			i=x-1;		//den d1 sang 30s
			j=x-1;		//den v2 sang 3s
			delay_hienthi(10);
		}
}
//chuong trinh chinh
void main (void)
{
	TRISA=TRISB=TRISC=TRISD=0X00;
	ADCON1=0X0F;
	while(1)
	{
		 den_nga_4();
	}
}