單片機BMP180氣壓溫度檢測程序 LCD1602顯示

ID:1073813 · 發表于 2023-4-26 17:32

電路連接

LCD1602：
數據端口>>>P2
RS>>>P1.2
RW>>>P1.1
EN>>>P1.3

BMP180:
SCL>>>P3.6
SDA>>>P3.7

BMP180的電源是1.8-3.6V，電壓過高有可能燒壞傳感器，在接5V單片機是需要注意降壓使用。

由于單片機IO口電平5V，如果使用IIC推薦的4.7K上拉電阻，傳感器會由于電壓過高出現數據錯誤，讀取到的氣壓值出現亂碼，解決方法是去掉IIC上的上拉電阻。

顯示效果如下：
程序：

#include  <REG52.H>
#include  <math.h>
#include  <stdlib.h>
#include  <stdio.h>
#include  <INTRINS.H>

#include "1602.h"

#define uchar unsigned char
#define uint unsigned int
#define DataPort P2
sbit       SCL=P3^6;
sbit          SDA=P3^7;
sbit    LCM_RS=P1^2;
sbit    LCM_RW=P1^1;
sbit    LCM_EN=P1^3;

#define       BMP085_SlaveAddress 0xee

#define OSS 0

typedef unsigned char  BYTE;
typedef unsigned short WORD;

uchar ge,shi,bai,qian,wan,shiwan;
int  dis_data;

short ac1;
short ac2;
short ac3;
unsigned short ac4;
unsigned short ac5;
unsigned short ac6;
short b1;
short b2;
short mb;
short mc;
short md;

void delay(unsigned int k);
void InitLcd();

void WriteDataLCM(uchar dataW);
void WriteCommandLCM(uchar CMD,uchar Attribc);
void DisplayOneChar(uchar X,uchar Y,uchar DData);
void conversion(long temp_data);

void  Single_Write(uchar SlaveAddress,uchar REG_Address,uchar REG_data);
uchar Single_Read(uchar REG_Address);
void  Multiple_Read(uchar,uchar);
//------------------------------------
void Delay5us();
void Delay5ms();
void BMP085_Start();
void BMP085_Stop();
void BMP085_SendACK(bit ack);
bit  BMP085_RecvACK();
void BMP085_SendByte(BYTE dat);
BYTE BMP085_RecvByte();
void BMP085_ReadPage();
void BMP085_WritePage();
//-----------------------------------

//*********************************************************
void conversion(long temp_data)
{

shiwan=temp_data/100000+0x30 ;
temp_data=temp_data%100000;
wan=temp_data/10000+0x30 ;
temp_data=temp_data%10000;
            qian=temp_data/1000+0x30 ;
temp_data=temp_data%1000;
bai=temp_data/100+0x30 ;
temp_data=temp_data%100;
shi=temp_data/10+0x30 ;
temp_data=temp_data%10;
ge=temp_data+0x30;
}

/*******************************/
void delay(unsigned int k)
{
unsigned int i,j;
for(i=0;i<k;i++)
{
for(j=0;j<121;j++)
{;}}
}
/*******************************/
void WaitForEnable(void)
{
DataPort=0xff;
LCM_RS=0;LCM_RW=1;_nop_();
LCM_EN=1;_nop_();_nop_();
while(DataPort&0x80);
LCM_EN=0;
}
/*******************************/
void WriteCommandLCM(uchar CMD,uchar Attribc)
{
if(Attribc)WaitForEnable();
LCM_RS=0;LCM_RW=0;_nop_();
DataPort=CMD;_nop_();
LCM_EN=1;_nop_();_nop_();LCM_EN=0;
}
/*******************************/
void WriteDataLCM(uchar dataW)
{
WaitForEnable();
LCM_RS=1;LCM_RW=0;_nop_();
DataPort=dataW;_nop_();
LCM_EN=1;_nop_();_nop_();LCM_EN=0;
}
/***********************************/
void InitLcd()
{
WriteCommandLCM(0x0e,1);
WriteCommandLCM(0x3c,1);
WriteCommandLCM(0x01,1);
//WriteCommandLCM(0x06,1);
//WriteCommandLCM(0x0c,1);
}
void DisplayOneChar(uchar X,uchar Y,uchar DData)
{
Y&=1;
X&=15;
if(Y)X|=0x40;
X|=0x80;
WriteCommandLCM(X,0);
WriteDataLCM(DData);
}

void Delay5us()
{
_nop_();_nop_();_nop_();_nop_();
_nop_();_nop_();_nop_();_nop_();
      _nop_();_nop_();_nop_();_nop_();
      _nop_();_nop_();_nop_();_nop_();
}

void Delay5ms()
{
WORD n = 560;

while (n--);
}

void BMP085_Start()
{
SDA = 1;
SCL = 1;
Delay5us();
SDA = 0;
Delay5us();
SCL = 0;
}

void BMP085_Stop()
{
SDA = 0;
SCL = 1;
Delay5us();
SDA = 1;
Delay5us();
}

void BMP085_SendACK(bit ack)
{
SDA = ack;
SCL = 1;
Delay5us();
SCL = 0;
Delay5us();
}

bit BMP085_RecvACK()
{
SCL = 1;
Delay5us();
CY = SDA;
SCL = 0;
Delay5us();

return CY;
}

void BMP085_SendByte(BYTE dat)
{
BYTE i;

for (i=0; i<8; i++)
{
      dat <<= 1;
      SDA = CY;
      SCL = 1;
      Delay5us();
      SCL = 0;
      Delay5us();
}
BMP085_RecvACK();
}

BYTE BMP085_RecvByte()
{
BYTE i;
BYTE dat = 0;

SDA = 1;
for (i=0; i<8; i++)
{
      dat <<= 1;
      SCL = 1;
      Delay5us();
      dat |= SDA;
      SCL = 0;
      Delay5us();
}
return dat;
}
short Multiple_read(uchar ST_Address)
{
      uchar msb, lsb;
      short _data;
BMP085_Start();
BMP085_SendByte(BMP085_SlaveAddress);
BMP085_SendByte(ST_Address);
BMP085_Start();
BMP085_SendByte(BMP085_SlaveAddress+1);

msb = BMP085_RecvByte();
BMP085_SendACK(0);
lsb = BMP085_RecvByte();
      BMP085_SendACK(1);

BMP085_Stop();
Delay5ms();
_data = msb << 8;
      _data |= lsb;
      return _data;
}
long bmp085ReadTemp(void)
{

BMP085_Start();
BMP085_SendByte(BMP085_SlaveAddress);
BMP085_SendByte(0xF4);
BMP085_SendByte(0x2E);
BMP085_Stop();
      delay(10);

      return (long) Multiple_read(0xF6);
}
long bmp085ReadPressure(void)
{
      long pressure = 0;

BMP085_Start();
BMP085_SendByte(BMP085_SlaveAddress);
BMP085_SendByte(0xF4);
BMP085_SendByte(0x34);
BMP085_Stop();
      delay(10);

      pressure = Multiple_read(0xF6);
      pressure &= 0x0000FFFF;

      return pressure;
}
void Init_BMP085()
{
      ac1 = Multiple_read(0xAA);
      ac2 = Multiple_read(0xAC);
      ac3 = Multiple_read(0xAE);
      ac4 = Multiple_read(0xB0);
      ac5 = Multiple_read(0xB2);
      ac6 = Multiple_read(0xB4);
      b1 =  Multiple_read(0xB6);
      b2 =  Multiple_read(0xB8);
      mb =  Multiple_read(0xBA);
      mc =  Multiple_read(0xBC);
      md =  Multiple_read(0xBE);
}
//***********************************************************************
void bmp085Convert()
{
      long ut;
      long up;
      long x1, x2, b5, b6, x3, b3, p;
      unsigned long b4, b7;
      long  temperature;
      long  pressure;

      ut = bmp085ReadTemp();
      ut = bmp085ReadTemp();
      up = bmp085ReadPressure();
      up = bmp085ReadPressure();

      x1 = ((long)ut - ac6) * ac5 >> 15;
      x2 = ((long) mc << 11) / (x1 + md);
      b5 = x1 + x2;
      temperature = (b5 + 8) >> 4;

      //*************

      conversion(temperature);
      play(4,0,'T');
      play(5,0,':');
      play(7,0,bai);
      play(8,0,shi);
      play(9,0,'.');
      play(10,0,ge);
      play(11,0,0XDF);
      play(12,0,'C');


      b6 = b5 - 4000;
      x1 = (b2 * (b6 * b6 >> 12)) >> 11;
      x2 = ac2 * b6 >> 11;
      x3 = x1 + x2;
      b3 = (((long)ac1 * 4 + x3) + 2)/4;
      x1 = ac3 * b6 >> 13;
      x2 = (b1 * (b6 * b6 >> 12)) >> 16;
      x3 = ((x1 + x2) + 2) >> 2;
      b4 = (ac4 * (unsigned long) (x3 + 32768)) >> 15;
      b7 = ((unsigned long) up - b3) * (50000 >> OSS);
      if( b7 < 0x80000000)
         p = (b7 * 2) / b4 ;
         else
                  p = (b7 / b4) * 2;
      x1 = (p >> 8) * (p >> 8);
      x1 = (x1 * 3038) >> 16;
      x2 = (-7357 * p) >> 16;
      pressure = p + ((x1 + x2 + 3791) >> 4);

      conversion(pressure);
      play(4,1,'P');
      play(5,1,':');
      play(6,1,shiwan);
      play(7,1,wan);
      play(8,1,qian);
      play(9,1,'.');
      play(10,1,bai);
      play(11,1,shi);
            play(12,1,ge);
      play(13,1,'K');
      play(14,1,'p');
      play(15,1,'a');

}

void main()
{
delay(50);
  init_lcd();
//       InitLcd();
Init_BMP085();
  while(1)
  {

bmp085Convert();
      delay(1000);
  }
}
1602驅動程序：
#include "1602.h"
/*
LCD1602使用延時函數
*/
void delay_lcd(uint x)
{
      uint i;
      for(i=0;i<x;i++);
}
/*
給顯示屏發送控制碼
*/
void sentcode(uchar cod)
{
      show=cod;
      lcdrs=0;
      lcde=1;
      delay_lcd(10);
      lcde=0;
      delay_lcd(10);
}
/*
給顯示屏發送顯示數據
*/
void sentdata(uchar dat)
{
      show=dat;
      lcdrs=1;
      lcde=1;
      delay_lcd(10);
      lcde=0;
      delay_lcd(10);
}
/*
顯示屏初始化，只定不讀
*/
void init_lcd(void)
{
  lcdrw=0;
      sentcode(0x0e);
      sentcode(0x3c);
      sentcode(0x01);
  delay_lcd(100);

}
/*
在a行b列顯示一個字符
*/
void play(uchar a,uchar b,uchar dat)
{
      uchar dress;
      if(b)
      dress=0xc0+a;
      else
      dress=0x80+a;
      sentcode(dress);
      sentdata(dat);
}
/*
在x行y列開始顯示字符串
字符串指針*p
speed：顯示每一個字符后停留的時間
delay:顯示完一屏后停留的時間
clear:顯示完一屏后是否進行清屏操作，0為不清屏，其余為清屏
*/
void ShowStr(uchar x , uchar y , char *p , uint speed , uint delay , uchar clear)
{
  uchar dress;
  while(*p!='\0')
  {
if(y)
{
   dress = 0xc0+x;
   sentcode(dress);
   sentdata(*p);
   p++;
   x++;
   if((dress-0xc0)>14)
   {
      dress = 0x80+x;
      y=0;
      x=0;
      delay_lcd(delay);
      if(clear)
      {
      sentcode(LCD_CLEAR_SCREEN);
      }
   }

}
else
{
   dress = 0x80+x;
   sentcode(dress);
   sentdata(*p);
   p++;
   x++;
   if((dress-0x80)>14)
   {
      dress = 0x80+x;
      y=1;
      x=0;
   }
}
delay_lcd(speed);
  }
}
/*
清屏操作
*/
void lcd_clear(void)
{
  sentcode(LCD_CLEAR_SCREEN);
//  sentcode(LCD_HOMING);
}
1602頭文件：
#ifndef __1602_h__
#define __1602_h__

#include "reg52.h"

#define uchar unsigned char
#define uint unsigned int

#define show P2//顯示數據總線
sbit lcdrs=P1^2;//控制/數據指示
sbit lcdrw=P1^1;//讀/寫指示
sbit lcde=P1^3;//使能

#define LCD_CLEAR_SCREEN       0x01    // 清屏
#define LCD_HOMING                0x02    // 光標返回原點

void delay_lcd(uint x);
void sentcode(uchar cod);
void sentdata(uchar dat);
void init_lcd(void);
void play(uchar a,uchar b,uchar dat);
void ShowStr(uchar x , uchar y , char *p , uint speed , uint delay , uchar clear);
void lcd_clear(void);

#endif

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單片機BMP180氣壓溫度檢測程序 LCD1602顯示

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