p14_2.c

单片机原理与应用实例教程 单片机原理与应用实例教程

#include<absacc.h>
#include<reg51.h>

#define uchar unsigned char
#define uchar unsigned char
sbit START	= P0^2;
sbit OE		= P0^0;
sbit EOC	= P0^1;
uchar data  led[4];
uchar data  tvdata;    

uchar code  tv[]={0xf7, 0xfb, 0xfd, 0xfe};
uchar code  dsp[]={0x3f,0x06,0x5b,0x4f,
                 0x66,0x6d,0x7d,0x07,0x7f,0x6f};

void delay(void)                      //延时程序
{
  	unsigned int i;
	for(i=0;i<10;i++);
}


void LedDisplay(void)       //显示模块
{
	uchar k,i;
	led[0]	= tvdata % 10;
	led[1]	= (tvdata / 10) % 10;
	led[2]	= (tvdata / 100) % 10;
	led[3]	= 0;
		
	for(k=0;k<4;k++)
	{ 
		P3	= tv[k];
		i	= led[k];
		P2	= dsp[i];
		delay();
	}
} 


void main(void)
{
	while(1)
	{
		START=1;
		START=0;          //启动转换
		while(EOC==0);
		OE = 1;
		tvdata = P1;
		OE = 0;
		LedDisplay();
		delay();
	}
}