基于现场总线的温度测控系统设计 第14页

#include <reg52.h>
#include <intrins.h>
#include <absacc.h>
#include <stdio.h>
#include <math.h>
#define uchar unsigned char
#define uint unsigned int

sbit LCD_RS = P0^2;                            //LCD数据/指令通道选择
sbit LCD_RW = P0^1;                                //LCD读写选择信号
sbit LCD_EN = P0^0;                                //LCD势使能
sbit P0_5=P0^5;                                    //蜂鸣器引脚
sbit P0_6=P0^6;                                    //冷却电路输入端
sbit P0_7=P0^7;                                    //加热电路输入端
sbit P3_5=P3^5;                                    //传感器数据接入脚
uchar code seg7code[]={0x3f,0x06,0x5b,0x4f, 0x66,0x6d,0x7d,0x07,
                              0x7f,0x6f,0x77,0x7c,0x39,0x5e,0x79,0x71};        //16位键码码
uchar TEMP;                // 温度值的变量；
uchar flag1;            // 结果为负和正的标志位。  
uchar k;                                //K为按键键值段码顺序
uchar M;                                //键盘扫描值
uchar E;                                //E为温度范围下限侄
uchar F;                                //F为温度范围上限值

void delay (uint count)       //延时程序
{         
 uint i; 
 while (count) 
 {
  i =200;
  while (i>0) i--;
  count--;
    }
}

Getch (  )           //键盘扫描程序
{   uchar X,Y,Z;
 P2=0xff;
 P2=0x0f;                                   //先对P2置数  行扫描
 if(P2!=0x0f)                                //判断是否有键按下
 {delay(25);                             //延时,软件去干扰 延时10MS
  if(P2!=0x0f)                               //确认按键按下X = P2;
 {
 X=P2;                               //保存行扫描时有键按下时状态
 P2=0xf0;                                    //列扫描
 Y=P2;                                //保存列扫描时有键按下时状态
  Z=X|Y;                                      //取出键值
 switch ( Z )                                   //判断键值（那一个键按下）
 {
  case 0xee: k=0; break;                       //对键值赋值
  case 0xde: k=1; break;
  case 0xbe: k=2; break;
  case 0x7e: k=3; break;
  case 0xed: k=4; break;
  case 0xdd: k=5; break;
  case 0xbd: k=6; break;
  case 0x7d: k=7; break;
  case 0xeb: k=8; break;
  case 0xdb: k=9; break;  
  case 0xbb: k=10;break;
  case 0x7b: k=11;break;
  case 0xe7: k=12;break;
  case 0xd7: k=13;break;
  case 0xb7: k=14;break;
  case 0x77: k=15;break;
 }
        M=seg7code[k];
        return(M);
 }
 }
}

void tmreset (void)    // 发送复位和初始化
{
 uint i;
 P3_5 = 0; 
 i = 103;
751com.cn 
}

bit tmpread (void)  // 读取数据的一位
{
 uint i;
 bit dat;
 P3_5 = 0; i++; 
 P3_5 = 1; i++; i++;            //延时 
 dat = P3_5; 
 i = 8; while (i>0) i--;         // 延时
 return (dat);
} 

uchar tmpread2 (void)          //读一个字节
{
 uchar i,j,dat; 
 dat = 0; 
 for (i=1;i<=8;i++)
 {

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