基于51单片机+bmp180的数字海拔计程序 -

#include <reg51.h>
#include <math.h> //Keil library
#include <stdlib.h> //Keil library
#include <stdio.h> //Keil library
#include <INTRINS.H> //Keil library
#include<absacc.h>
#include "lcd.h"
#include "BMP180.H"
/*定义传感器内部的EEPROM存储单元里面11个值*/
#define uchar unsigned char
#define uint unsigned int
typedef unsigned char BYTE;
typedef unsigned short WORD;
#define BMP085_SlaveAddress 0xee //定义器件在IIC总线中的从地址
short ac1;
short ac2;
short ac3;
unsigned short ac4;
unsigned short ac5;
unsigned short ac6;
short b1;
short b2;
uchar idata flag;
int idata AltitudeTemp[10]={0,0,0,0,0,0,0,0,0,0}; // 海拔高度的10个临时值，取平均值
short mb;
short mc;
short md;
#define OSS 0// Oversampling Setting (note: code is not set up to use other OSS values)
uchar code PressureTitle[16]= {"气压温度测量"};
uchar idata ShowPressure[16]= {"高度：米"};
uchar idata ShowTemperature[16]={"温度: . ℃"};
uchar idata ShowAltitude[16]= {"电压: . V"};
uchar code HZW0[10]={"欢迎使用"};
uchar code HZW1[12]={"海拔高度计"};
uchar code Blank[16];
bit ack;
sbit DA = P2^0;
sbit CK = P2^1;
sbit CS = P2^2;
uchar TaskFlag;
//*延时us级函数
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 Delay1ms(uint xms)
{ uint a,b;
for(a=0;a<110;a++)
for(b=0;b<xms;b++);
}
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;
}
//*********************************************************
//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
Delay1ms(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
Delay1ms(10); // max time is 4.5ms
pressure = Multiple_read(0xF6);
pressure &= 0x0000FFFF;
return pressure;
}
//**************************************************************
//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 da5615(unsigned int da)
{
unsigned char i;
da <<= 6;//10有效数据左对齐
CS = 0;
CK = 0;
for (i=0;i<12;i++)
{
DA = (bit)(da & 0x8000);
CK = 1;
da <<= 1;
CK = 0;
}
CS = 1;
CK = 0;
}
/* 函数名:BMP085_Get_Param(bit choice) 功能：读出转换后的温度或气压值当实参为1时，返回气压；当实参为0时，返回温度
备注：返回温度值为0.1，调用时转换为1。气压为Pa,调用时气压转换hPa */
long BMP085_Get_Param(bit choice)
{
long ut;
long up;
long x1, x2, b5, b6, x3, b3, p;
unsigned long b4, b7;
long temperature;
long pressure;//压力值
ut = bmp085ReadTemp(); // 读取温度
up = bmp085ReadPressure(); // 读取压强
x1 = (((long)ut - (long)ac6)*(long)ac5) >> 15;
x2 = ((long) mc << 11) / (x1 + md);
b5 = x1 + x2;
temperature = ((b5 + 8) >> 4);
if(choice==0)
return (long)temperature;
b6 = b5 - 4000;
// Calculate B3
x1 = (b2 * (b6 * b6)>>12)>>11;
x2 = (ac2 * b6)>>11;
x3 = x1 + x2;
b3 = (((((long)ac1)*4 + x3)<<OSS) + 2)>>2;
// Calculate B4
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<<1)/b4;
else
p = (b7/b4)<<1;
x1 = (p>>8) * (p>>8);
x1 = (x1 * 3038)>>16;
x2 = (-7357 * p)>>16;
pressure = p+((x1 + x2 + 3791)>>4);
return (long)pressure;
}
/* 函数名:BMP085_Get_Altitude 功能：获取海拔高度值
备注：返回高度值为米，调用时再转换成带小数以米为单位的高度值 */
int Get_Altitude()
{
float pressure;
float altitude;
pressure=(float)BMP085_Get_Param(1); //获取气压值
altitude=44330*(1-pow(pressure/101325,1/5.255)); //根据芯片手册提供的公式计算海拔高度单位：米
altitude*=100;
return(int)altitude;
}
/* LCD程序 */
void ConvPressure() // 转换气压，用于LCD的显示
{
long Pressure;
Pressure=BMP085_Get_Param(1);
if(Pressure>=0)ShowPressure[6]='+';
else
{
ShowPressure[6]='-';
Pressure=~Pressure;
}
// ShowPressure[7]=Pressure%1000000/100000+48;
// ShowPressure[8]=Pressure%100000/10000+48;
// ShowPressure[9]=Pressure%10000/1000+48;
// ShowPressure[10]='.';
// ShowPressure[11]=Pressure%1000/100+48;
// ShowPressure[13]='K';
//
}
void ConvTemperature() //转换气温，用于LCD显示
{
int Temperature;
Temperature=(int)BMP085_Get_Param(0);
if(Temperature>=0)ShowTemperature[6]='+';
else
{
ShowTemperature[6]='-';
Temperature=~Temperature;
}
ShowTemperature[10]=Temperature%1000/100+48;
ShowTemperature[11]=Temperature%100/10+48;
ShowTemperature[13]=Temperature%10+48;
}
void ConvAltitude()
{
uint voltage;
uint ab5;
uchar a;
uchar ab1,ab2,ab3,ab4,ab6;
unsigned char xiaoshu,zhengshu,xiaoshu2;
long Altitude;
Altitude=Get_Altitude();
if(Altitude>=0)ShowAltitude[6]='+';
else
{
ShowAltitude[6]='-';
Altitude=~Altitude;
}
/* 最多10次测量值的平均值为测量结果*/
flag++;
if(flag>=10) flag=0;
AltitudeTemp[flag]=Altitude;
for(a=0;a<10;a++)
Altitude+=AltitudeTemp[a];
Altitude/=11;
ab1=Altitude/10000;
ab2=Altitude%10000/1000;
ab3=Altitude%1000/100;
ab4=Altitude%100/10;
ab5=ab1*1000+ab2*100+ab3*10+ab4;
ab6=(int)(ab5/4);
da5615(ab6);
voltage=ab5*2;
zhengshu=voltage/1000;
xiaoshu=voltage%1000/100;
xiaoshu2=voltage%100/10;
if(xiaoshu2>=5)
{
xiaoshu=xiaoshu+1;
}
ShowPressure[9]=Altitude/10000+48;
ShowPressure[10]=Altitude%10000/1000+48;
ShowPressure[11]=Altitude%1000/100+48;
ShowPressure[12]=Altitude%100/10+48;
ShowAltitude[12]=zhengshu+0x30;
ShowAltitude[14]=xiaoshu+0x30;
}
/* 文字显示函数形式参数格式规定： x轴位置，从左到右，以两个字符或一个汉字作为一格取值范围（0-7） y轴位置，从上到下，以一个汉字为一格，取值范围为（0-3）
数组名称，将数组的值以指针形式访问显示数量，将数组里面的指定数量的内容显示出来，取值范围（0-15） */
void Show_BMP085_Result() //显示测量结果
{
// ConvPressure();
ConvTemperature();
ConvAltitude();
WordDisplay(1,0,PressureTitle,12); //气压温度测量
WordDisplay(0,1,ShowPressure,16); // 气压 Pa
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