| 本人自学单片机，硬件还行！软件不怎么样！ 最近想用OLED屏做一个海拔表，用的BMP180的传感器，网上找了一些程序修改后！能正常显示温度和气压！温度是准确的，但是气压和海拔不行，从1楼26楼只变化了几米的高度！ 求助大神帮我看看！
[mw_shl_code=c,true]#include <STC15F2K60S2.H>
#include <math.h> //Keil library
#include "OLED.H"
#define uchar unsigned char
#define uint unsigned int
sbit SCL=P5^3; //IIC时钟引脚定义
sbit SDA=P0^5; //IIC数据引脚定义
#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 BMP_ge,BMP_shi,BMP_bai,BMP_qian,BMP_wan,BMP_shiwan; //显示变量
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 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 BMP085_Start();
void BMP085_Stop();
void BMP085_SendACK(bit ack);
bit BMP085_RecvACK();
void BMP085_SendByte(BYTE dat);
BYTE BMP085_RecvByte();
void delay5us() //
{
unsigned char a;
for(a=12;a>0;a--);
}
void delay5ms(void) //
{
unsigned char a,b,c;
for(c=2;c>0;c--)
for(b=238;b>0;b--)
for(a=30;a>0;a--);
}
/**************************************
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(); //延时5MS
_data = msb << 8;
_data |= lsb;
return _data;
}
//********************************************************************
long bmp085ReadTemp(void) //读取未校准温度数据
{
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
delay5ms(); //延时5MS
// max time is 4.5ms
return (long) Multiple_read(0xF6);
}
//*************************************************************
long bmp085ReadPressure(void) //读取未校准气压数据
{
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
delay5ms(); // 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 conversion(long temp_data)
{
BMP_shiwan=temp_data/100000+0x30 ;
temp_data=temp_data%100000; //取余运算
BMP_wan=temp_data/10000+0x30 ;
temp_data=temp_data%10000; //取余运算
BMP_qian=temp_data/1000+0x30 ;
temp_data=temp_data%1000; //取余运算
BMP_bai=temp_data/100+0x30 ;
temp_data=temp_data%100; //取余运算
BMP_shi=temp_data/10+0x30 ;
temp_data=temp_data%10; //取余运算
BMP_ge=temp_data+0x30;
}
void bmp085Convert()
{
long ut;
long up;
long x1, x2, b5, b6, x3, b3, p;
unsigned long b4, b7;
long temperature; //定义温度
long pressure; //定义气压
float Altitude; //定义海拔
ut = bmp085ReadTemp();
ut = bmp085ReadTemp(); // 读取温度
up = bmp085ReadPressure();
up = bmp085ReadPressure(); // 读取压强
x1 = ((long)ut - ac6) * ac5 >> 15; //温度校正
x2 = ((long) mc << 11) / (x1 + md);
b5 = x1 + x2;
temperature = (b5 + 8) >> 4;
//*************
conversion(temperature);
LED_P6x8Str(0,2, (unsigned char*)"Temp:"); //温度
LED_P6x8Char(42,2, BMP_bai); //百位
LED_P6x8Char(48,2,BMP_shi); //十位
LED_P6x8Str(54,2,(unsigned char*)".");//.
LED_P6x8Char(60,2,BMP_ge);
LED_P6x8Str(67,2,(unsigned char*)"{");//℃
//****************************************************************
b6 = b5 - 4000; //气压校正
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);
LED_P6x8Str(0,3, (unsigned char*)"pressure:"); //压强
LED_P6x8Char(60,3, BMP_shiwan);
LED_P6x8Char(66,3, BMP_wan); // 万位
//********************************************************************
LED_P6x8Char(72,3, BMP_qian); // 千位
LED_P6x8Str(78,3,(unsigned char*)".");//.
LED_P6x8Char(84,3, BMP_bai); // 百位
LED_P6x8Char(90,3, BMP_shi); // 十位
LED_P6x8Char(96,3, BMP_ge); // 个位
LED_P6x8Str(102,3,(unsigned char*)"kps");//. //单位
//********************************************************************
//海拔显示
//海拔计算
Altitude =(44330.0 * (1.0-pow((float)(pressure) / 101325.0, 1.0/5.255)) );
conversion(Altitude);
LED_P6x8Str(0,4, (unsigned char*)"Altitude:"); //海拔
LED_P6x8Char(66,4, BMP_wan); // 万位
LED_P6x8Char(72,4, BMP_qian); // 千位
LED_P6x8Char(78,4, BMP_bai); //百位
LED_P6x8Char(84,4, BMP_shi); // 十位
LED_P6x8Str(90,4,(unsigned char*)".");//.
LED_P6x8Char(96,4, BMP_ge); // 个位
LED_P6x8Str(102,4,(unsigned char*)"m"); //单位米
}
[/mw_shl_code]
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发表于 2014-11-12 12:45:14
楼主
发表于 2014-11-12 22:30:07
