displed.c.bak

单片机与键盘接口程序

#include <intrins.h>
//#include "me.h"
#include <regx52.h>
#include "disp.h"

//此处定义数码管各段位置
#define a   0x01		//D7
#define b   0x02		//D6
#define c  	0x04		//D4
#define d   0x08		//D3
#define e   0x10		//D2
#define f	  0x20		//D0
#define g		0x40		//D1
#define dot 0x80		//D5
extern unsigned char code seg[];
//////////////////////////////

//        ~(a+b+c+d+e+f),    // 共阳极
//        (a+b+c+d+e+f),    // 共阴极
//定义特殊符号
//数码管显示时用的编码
unsigned char code seg[] = 
{
	~(a+b+c+d+e+f),        // 0
	~(b+c),                // 1
	~(a+b+d+e+g),          // 2
	~(a+b+c+d+g),          // 3
	~(b+c+f+g),            // 4
	~(a+c+d+f+g),          // 5
	~(a+c+d+e+f+g),        // 6
	~(a+b+c),			   			// 7
	~(a+b+c+d+e+f+g),      // 8
	~(a+b+c+d+f+g),        // 9
	~(a+b+c+e+f+g),        //A
	~(c+d+e+f+g),          //b
	~(a+d+e+f),            //C
	~(b+c+d+e+g),          //d
	~(a+d+e+f+g),          //E
	~(a+e+f+g)             //F
};
unsigned char stacode=0;
char dispbuf[6];
char low[]={0xfe,0xfd,0xfb,0xf7,0xef,0xdf};
void put_num(char cnum)
{
	P0=seg[ cnum & 0x0f];
}

void disp_ascii(void) 
{ 
	static  char disppoint;

	P2=P2|0x3f;
	put_num(dispbuf[disppoint]);
	//P0=seg[ dispbuf[disppoint] & 0x0f];
	if(disppoint==2 && stacode==1)	P0&=~dot; /* 小数点*/
	P2=P2 & low[disppoint];
	if (disppoint++>=5)	disppoint=0;

}