萌新求救！我的MLX90614（GY906）和單片機交換數據只是顯示382.000

ID:343923 · 發表于 2018-6-10 21:18

MLX90614程序
#ifndef MLX_2018_6_6
#define MLX_2018_6_6
#include <intrins.h>
#include "LCD1602.h"

#define Nack_number 10
bdata unsigned char flag1; //可位尋址數據
sbit bit_out=flag1^7;
sbit bit_in=flag1^0;
unsigned char temp2=0;                      //設全局變量
unsigned char temp1=0;
unsigned char err=0;
//float m90614 =0;
//*************************************************************************

sbit SCK=P3^7; //時鐘線
sbit SDA=P3^6; //數據線
void start_mlx();
void read_bit(void);
unsigned char ReadByte(void);
unsigned int  change(unsigned int tem);
void send_bit(void);
//------------延時--------------
void delay1(unsigned int n)
{
      unsigned int j;
      for(j=0;j<n;j++)
      {
            _nop_();
      }
}
//開始********************************************************
void start(void)                //停止條件是 SCK=1時，SDA由1到0
{
      SDA=1;       delay1(4);
      SCK=1;       delay1(4);
      SDA=0;       delay1(4);
      SCK=0;       delay1(4);
}

//結束********************************************************
void stop(void)                //停止條件是 SCK=1時，SDA由0到1
{
      SCK=0;       delay1(4);
      SDA=0;       delay1(4);
      SCK=1;       delay1(4);
      SDA=1;
}
//發送一個字節********************************************************
void SendByte(unsigned char number)
{
      unsigned char i,n,dat;
      n=Nack_number; //可以重發次數
      Send_again:
      dat=number;
      for(i=0;i<8;i++) //8位依次發送
      {
            if(dat&0x80) //取最高位
            {
                     bit_out=1; //發1
            }
            else
            {
                     bit_out=0; //發0
            }
            send_bit(); //發送一個位
            dat=dat<<1; //左移一位
      }
      read_bit(); //接收1位應答信號
      if(bit_in==1) //無應答時重發
      {
            stop();
            if(n!=0)
            {
                     n--; //可以重發Nack_number=10次
                     goto Repeat; //重發
            }
            else
            {
                     goto exit; //退出
            }
      }
      else
      {
            goto exit;
      }
      Repeat:
      start(); //重新開始
      goto Send_again; //重發
      exit: ; //退出
}
//-----------發送一個位---------
void send_bit(void)
{
      if(bit_out==1)
      {
            SDA=1; //發1
      }
      else
      {
            SDA=0; //發0
      }
//       _nop_();
      SCK=1; //上升沿
      delay1(4); delay1(4);
      SCK=0;
      delay1(4); delay1(4);
}
//----------接收一個字節--------
unsigned char ReadByte(void)
{
      unsigned char i,dat;
      dat=0; //初值為0
      for(i=0;i<8;i++)
      {
            dat=dat<<1; //左移
            read_bit(); //接收一位
            if(bit_in==1)
      {
            dat=dat+1; //為1時對應位加1
      }
      }
      SDA=0; //發送應答信號0
      send_bit();
      return dat; //帶回接收數據
}
//----------接收一個位----------
void read_bit(void)
{
      SDA=1; //數據端先置1
      bit_in=1;
      SCK=1; //上升沿
      delay1(4);
      delay1(4);
      bit_in=SDA; //讀數據
      _nop_();
      SCK=0;
      delay1(4);
      delay1(4);
}
unsigned int readtemp(void)
{
      SCK=0;
      start(); //開始條件
      SendByte(0x00); //發送從地址00
      SendByte(0x07); //發送命令
      start(); //開始條件
      SendByte(0x01); //讀從地址00
      bit_out=0;
      temp2=ReadByte(); //讀數據低字節
      bit_out=0;
      temp1=ReadByte(); //讀數據高字節
      bit_out=1;
      err=ReadByte(); //讀錯誤信息碼
      stop(); //停止條件
      return(temp1*256+temp2);
}
//溫度轉換************************************************************************88
unsigned int change(unsigned int tem)
{
      float mlx_t ,mlx_k ,a =0,b =0;
      float mlx_back;
      mlx_t = tem*2;
      if(mlx_t >27315)
      {
            mlx_k = mlx_t - 27315;
            a = mlx_k/100;
            b = mlx_k - a*100;
            mlx_back = a+(b/100);
      }
      else
      {
            mlx_k = 27315 - mlx_t;
            a = mlx_k/100;
            b = mlx_k - a*100;
            mlx_back = a+b;
      }
      return mlx_back;
}
void start_mlx()
{
      SCK=1;
      SDA=1;
      delay1(4);
      SCK=0;
      delay1(100);
      SCK=1;
}
#endif

主函數
/*******************************************
程序功能：利用單線制DS18B20溫度傳感器
      LED數碼管顯示當前的溫度值
********************************************/
#include <reg51.h>
#include "LCD1602.h"
#include "DS18B20.h"
#include "BUZZER.h"
#include "90614.h"
#include "stdio.h"
sbit keys= P3^5;

float T=0;
void Delay1ms(unsigned int count)
{
      unsigned int i,j;
      for(i=0;i<count;i++)
      for(j=0;j<113;j++);
}
//**************************** //主程序
main()
{
unsigned int value = 0;
unsigned char buffer[40];


            LCD_Initial();
while (1)
{

                  start_mlx();
                        if(keys == 0)
                  {

                              GotoXY(0,0);
                        Print("DS18B20 Temper");
                              ReadTemperature() ;
                              GotoXY(3,1);
                              sprintf(buffer,"+%6.3f",temper);
                           Print(buffer);
                              Print(" ^C");
                              buzze(temper);
                           Delay1ms(200);
                        }

            else
                  {

                              GotoXY(0,0);
                           Print("    IR Temper");
                              T = readtemp();
                              T = change(T);
                              GotoXY(3,1);
                              sprintf(buffer,"%6.4f",T);
                           Print(buffer);
                              Print("^C");
                                 buzze(T);
                           Delay1ms(200);
                        }

      }
}