BMP085 气压模块-C51-LCD1602显示-程序-原理图 - 圣源电子制作

/*
* BMP085模块
*
* 用途：BMP085模块IIC测试程序
*
* 作者日期备注
* Huafeng Lin 2010/12/10 新增
* Huafeng Lin 2010/12/11 修改
*
*/
#include <REG51.H>
#include <math.h> //Keil library
#include <stdlib.h> //Keil library
#include <stdio.h> //Keil library
#include <INTRINS.H> //Keil library
#define uchar unsigned char
#define uint unsigned int
#define DataPort P2 //LCD1602数据端口
sbit SCL=P1^0; //IIC时钟引脚定义
sbit SDA=P1^1; //IIC数据引脚定义
sbit LCM_RS=P0^2; //LCD1602命令端口
sbit LCM_RW=P0^1; //LCD1602命令端口
sbit LCM_EN=P0^0; //LCD1602命令端口
#define BMP085_SlaveAddress 0xee //定义器件在IIC总线中的从地址
#define OSS 0 // Oversampling Setting (note: code is not set up to use other OSS values)
typedef unsigned char BYTE;
typedef unsigned short WORD;
uchar ge,shi,bai,qian,wan,shiwan; //显示变量
int dis_data; //变量
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(); //初始化lcd1602
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); //单个写入数据
uchar Single_Read(uchar REG_Address); //单个读取内部寄存器数据
void Multiple_Read(uchar,uchar); //连续的读取内部寄存器数据
//------------------------------------
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; //取余运算
wan=temp_data/10000+0x30 ;
temp_data=temp_data%10000; //取余运算
qian=temp_data/1000+0x30 ;
temp_data=temp_data%1000; //取余运算
bai=temp_data/100+0x30 ;
temp_data=temp_data%100; //取余运算
shi=temp_data/10+0x30 ;
temp_data=temp_data%10; //取余运算
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(0x38,1);
WriteCommandLCM(0x08,1);
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);
}
/**************************************
延时5微秒(STC90C52RC@12M)
不同的工作环境,需要调整此函数，注意时钟过快时需要修改
当改用1T的MCU时,请调整此延时函数
**************************************/
void Delay5us()
{
_nop_();_nop_();_nop_();_nop_();
_nop_();_nop_();_nop_();_nop_();
_nop_();_nop_();_nop_();_nop_();
_nop_();_nop_();_nop_();_nop_();
}
/**************************************
延时5毫秒(STC90C52RC@12M)
不同的工作环境,需要调整此函数
当改用1T的MCU时,请调整此延时函数
**************************************/
void Delay5ms()
{
WORD n = 560;
while (n--);
}
/**************************************
起始信号
**************************************/
void BMP085_Start()
{
SDA = 1; //拉高数据线
SCL = 1; //拉高时钟线
Delay5us(); //延时
SDA = 0; //产生下降沿
Delay5us(); //延时
SCL = 0; //拉低时钟线
}
/**************************************
停止信号
**************************************/
void BMP085_Stop()
{
SDA = 0; //拉低数据线
SCL = 1; //拉高时钟线
Delay5us(); //延时
SDA = 1; //产生上升沿
Delay5us(); //延时
}
/**************************************
发送应答信号
入口参数:ack (0:ACK 1:NAK)
**************************************/
void BMP085_SendACK(bit ack)
{
SDA = ack; //写应答信号
SCL = 1; //拉高时钟线
Delay5us(); //延时
SCL = 0; //拉低时钟线
Delay5us(); //延时
}
/**************************************
接收应答信号
**************************************/
bit BMP085_RecvACK()
{
SCL = 1; //拉高时钟线
Delay5us(); //延时
CY = SDA; //读应答信号
SCL = 0; //拉低时钟线
Delay5us(); //延时
return CY;
}
/**************************************
向IIC总线发送一个字节数据
**************************************/
void BMP085_SendByte(BYTE dat)
{
BYTE i;
for (i=0; i<8; i++) //8位计数器
{
dat <<= 1; //移出数据的最高位
SDA = CY; //送数据口
SCL = 1; //拉高时钟线
Delay5us(); //延时
SCL = 0; //拉低时钟线
Delay5us(); //延时
}
BMP085_RecvACK();
}
/**************************************
从IIC总线接收一个字节数据
**************************************/
BYTE BMP085_RecvByte()
{
BYTE i;
BYTE dat = 0;
SDA = 1; //使能内部上拉,准备读取数据,
for (i=0; i<8; i++) //8位计数器
{
dat <<= 1;
SCL = 1; //拉高时钟线
Delay5us(); //延时
dat |= SDA; //读数据
SCL = 0; //拉低时钟线
Delay5us(); //延时
}
return dat;
}
/*
//单字节写入BMP085内部数据*******************************
void Single_Write(uchar SlaveAddress,uchar REG_Address,uchar REG_data)
{
BMP085_Start(); //起始信号
BMP085_SendByte(SlaveAddress); //发送设备地址+写信号
BMP085_SendByte(REG_Address); //内部寄存器地址
BMP085_SendByte(REG_data); //内部寄存器数据
BMP085_Stop(); //发送停止信号
}
*/
/*
//单字节读取BMP085内部数据********************************
uchar Single_Read(uchar REG_Address)
{ uchar REG_data;
BMP085_Start(); //起始信号
BMP085_SendByte(BMP085_SlaveAddress); //发送设备地址+写信号
BMP085_SendByte(REG_Address); //发送存储单元地址
BMP085_Start(); //起始信号
BMP085_SendByte(BMP085_SlaveAddress+1); //发送设备地址+读信号
REG_data=BMP085_RecvByte(); //读出寄存器数据
BMP085_SendACK(1);
BMP085_Stop(); //停止信号
return REG_data;
}
*/
//*********************************************************
//读出BMP085内部数据,连续两个
//*********************************************************
short Multiple_read(uchar ST_Address)
{
uchar msb, lsb;
short _data;
BMP085_Start(); //起始信号
BMP085_SendByte(BMP085_SlaveAddress); //发送设备地址+写信号
BMP085_SendByte(ST_Address); //发送存储单元地址
BMP085_Start(); //起始信号
BMP085_SendByte(BMP085_SlaveAddress+1); //发送设备地址+读信号
msb = BMP085_RecvByte(); //BUF[0]存储
BMP085_SendACK(0); //回应ACK
lsb = BMP085_RecvByte();
BMP085_SendACK(1); //最后一个数据需要回NOACK
BMP085_Stop(); //停止信号
Delay5ms();
_data = msb << 8;
_data |= lsb;
return _data;
}
//********************************************************************
long bmp085ReadTemp(void)
{
BMP085_Start(); //起始信号
BMP085_SendByte(BMP085_SlaveAddress); //发送设备地址+写信号
BMP085_SendByte(0xF4); // write register address
BMP085_SendByte(0x2E); // write register data for temp
BMP085_Stop(); //发送停止信号
delay(10); // max time is 4.5ms
return (long) Multiple_read(0xF6);
}
//*************************************************************
long bmp085ReadPressure(void)
{
long pressure = 0;
BMP085_Start(); //起始信号
BMP085_SendByte(BMP085_SlaveAddress); //发送设备地址+写信号
BMP085_SendByte(0xF4); // write register address
BMP085_SendByte(0x34); // write register data for pressure
BMP085_Stop(); //发送停止信号
delay(10); // max time is 4.5ms
pressure = Multiple_read(0xF6);
pressure &= 0x0000FFFF;
return pressure;
//return (long) bmp085ReadShort(0xF6);
}
//**************************************************************
//初始化BMP085，根据需要请参考pdf进行修改**************
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(); // 读取温度
up = bmp085ReadPressure();
up = bmp085ReadPressure(); // 读取压强
x1 = ((long)ut - ac6) * ac5 >> 15;
x2 = ((long) mc << 11) / (x1 + md);
b5 = x1 + x2;
temperature = (b5 + 8) >> 4;
//*************
conversion(temperature);
DisplayOneChar(4,0,'T'); //温度显示
DisplayOneChar(5,0,':');
DisplayOneChar(7,0,bai);
DisplayOneChar(8,0,shi);
DisplayOneChar(9,0,'.');
DisplayOneChar(10,0,ge);
DisplayOneChar(11,0,0XDF); //温度单位
DisplayOneChar(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);
DisplayOneChar(4,1,'P'); //显示压强
DisplayOneChar(5,1,':');
DisplayOneChar(6,1,shiwan);
DisplayOneChar(7,1,wan);
DisplayOneChar(8,1,qian);
DisplayOneChar(9,1,'.');
DisplayOneChar(10,1,bai);
DisplayOneChar(11,1,shi);
DisplayOneChar(12,1,'K'); //气压单位
DisplayOneChar(13,1,'p');
DisplayOneChar(14,1,'a');
}
//*********************************************************
//******主程序********
//*********************************************************
void main()
{
delay(50); //上电延时
InitLcd(); //液晶初始化
Init_BMP085(); //初始化BMP085
while(1) //循环
{
bmp085Convert();
delay(1000);
}
}

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