</pre><p>BMP180气压传感器具有体积小，功耗低等优点，因为广泛的被应用于手机，手表等小型编写式设计，在淘宝上看到有现成的模块，就买了一个玩玩，目的是想将它和CC2540组合，做一个电子气压计，并通过蓝牙传送到手机。下面为BMP180在CC2540上的测试程序。</p><p></p><p></p><pre name="code" class="cpp"><span style="font-family: Arial, Helvetica, sans-serif;">#include<ioCC2540.h></span>
#include "bmp180.h"
//#include "bmpi2c.h"
#include <math.h> //Keil library
#include <stdlib.h> //Keil library
#include <stdio.h> //Keil library
#define uchar unsigned char
#define uint unsigned int
#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;
long temperature = 8;//温度值
long pressure = 8;//压力值
long height = 8;//相对海拔高度值
//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 Delay5us()
{
unsigned int i,j;
for(i=0;i<5;i++)
for(j=0;j<50;j++);
return;
}
void Delay_1ms(unsigned char msDelay)
{
unsigned int i,j;
for(i=0;i<msDelay;i++)
for(j=0;j<5;j++);
return;
}
/**************************************
延时5毫秒([email protected])
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 = 25;
while (n--);
}
/**************************************
起始信号
**************************************/
void BMP085_Start()
{
P1DIR |= 0X01;
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()
{
P1DIR |= 0X01;
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(unsigned char ack)
{
P1DIR |= 0X01;
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
**************************************/
unsigned char BMP085_RecvACK()
{
P1DIR &= 0XFE; //input
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;
P1DIR |= 0X01;
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;
P1DIR &= 0XFE; //input
//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
Delay_1ms(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_1ms(10); // max time is 4.5ms
pressure = Multiple_read(0xf6);//F6 to d0 for test
pressure &= 0x0000FFFF;
return pressure;
}
//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;
//
///**************************************
//延时5微秒([email protected])
//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_();
//_nop_();_nop_();_nop_();_nop_();
//_nop_();_nop_();_nop_();_nop_();
//
//**************************************************************
//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()
{
unsigned int ut;
unsigned long up;
long x1, x2, b5, b6, x3, b3, p;
unsigned long b4, b7;
ut = bmp085ReadTemp(); // 读取温度
//ut = bmp085ReadTemp(); // 读取温度
up = bmp085ReadPressure(); // 读取压强
//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);
// 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;
// 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);
//height=(101325-pressure)*9;
height = 44330-4961*pow(pressure, 0.19);
// 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');
}
/*
void OLED_BMP180()
{
Init_BMP085();
bmp085Convert();
LCD_P8x16Str(20,3,"H:");
OLCD_P8x16(36,3,height/10000);
OLCD_P8x16(44,3,height%10000/1000);
OLCD_P8x16(52,3,height%1000/100);
//OLCD_P8x16(60,3,height%100/10);
LCD_P8x16Str(60,3,"M");
LCD_P8x16Str(20,5,"P:");
OLCD_P8x16(36,5,pressure/100000);
OLCD_P8x16(44,5,pressure%100000/10000);
OLCD_P8x16(52,5,pressure%10000/1000);
LCD_P8x16Str(60,5,".");
OLCD_P8x16(68,5,pressure%1000/100);
LCD_P8x16Str(76,5,"Kpa");
LCD_P8x16Str(20,1,"T:");
OLCD_P8x16(36,1,temperature/100);
OLCD_P8x16(44,1,temperature%100/10);
LCD_P8x16Str(52,1,".");
OLCD_P8x16(60,1,temperature%10);
LCD_P8x16Str(68,1,"'C");
}*/
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时间： 2024-10-12 07:25:58