shownum.c

汽车巡航定速系统模拟车速传感器驱动程序

#include <AT892051.H>
#include<stdio.h>
#include<intrins.h>
#include<string.h>
#include<IOkey.h>


extern void delay(unsigned int t);

unsigned char DigDsp[2]={0,0};


void DISPLAY(unsigned char x)
{
switch(x)
      {     
      case 0:
	         P1=0xC0;break;/*0*/
      case 1:
	         P1=0xF9;break;/*1*/
      case 2:
	         P1=0xA4;break;/*2*/
      case 3:
	         P1=0xB0;break;/*3*/
      case 4:
	         P1=0x99;break;
      case 5:
	         P1=0x92;break;
      case 6:
	         P1=0x82;break;
      case 7:
	         P1=0xF8;break;
      case 8:
             P1=0x80;break;
      case 9:
	         P1=0x90;break;
      default :
	         P1=0xff;break;
      }
}



void ShowNum(unsigned long int number)     
{
DigDsp[1]=number/10;
while(number>=10){number=number-10;}
DigDsp[0]=number;
DRIVE0=1;
DRIVE1=1;
if(DigDsp[1]>0){DRIVE1=0;DRIVE0=1;DISPLAY(DigDsp[1]);delay(200); }             
DRIVE1=1;
DRIVE0=0;
DISPLAY(DigDsp[0]);
delay(200);
}