led.c

c51的温度测量程序,利用的是模拟输入初学哦

 /*
 * File: Led.c
 *
 * Detail: Led显示温度值API
 *
 * Created by Pandar([e-mail]) on 2009-2-22
 *
 * Modified by Pandar([e-mail]) on 2009-2-22
 *
 */
#include "reg.h"
#include "math.h"
#include "Led.h"
#include "ChunfengStdX51.h"

uint8 xdata Led3 _at_ LED3_ADDRESS;
uint8 xdata Led2 _at_ LED2_ADDRESS;
uint8 xdata Led1 _at_ LED1_ADDRESS;
uint8 xdata Led0 _at_ LED0_ADDRESS;

uint8 code NumberCodec[11]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x7b,0x80};
uint8 code NumberCodecWithPoint[11]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x7b,0x80};
uint8 getNumber(uint16 value, uint8 index)
{
    uint8 n;
    for(n=0; n<index; n++)
      value/=10;
    return value%10;
}

void ShowTemperature(uint8 busValue)
{
    uint16 displayValue=busValue*(MAX_TEMPERATURE/256);
	Led3=NumberCodec[getNumber(displayValue, 3)];
	Led2=NumberCodecWithPoint[getNumber(displayValue, 2)];
    Led1=NumberCodec[getNumber(displayValue, 1)];
	Led0=NumberCodec[getNumber(displayValue, 0)];
}