BMP180气压传感器与STC89c51单片机

时间：2022-09-20 18:30:00 气体传感器采样电路 ae101传感器 3b6传感器32002105 0280217518传感器tf tf14传感器 100mb温度传感器

这是我想的BMP180程序，串口输出测量值。检测到的温度总是错误的，气压也没有问题。海拔高度的计算是从网上挑选出来的。让我们一起交流，集思广益。

#include

#define uchar unsigned char

#define uint unsigned int

sbit SDA=P1^0;

sbit SCL=P1^1;

uchar code Comd0[]="temp:";

uint tempre[6];

#define OSS 1 // 过采样设置，(OSS0，1，2，3)

long temperature=0; //温度值

long pressure=0; //压力值

float height=0; //相对海拔高度值

short ac1;

short ac2;

short ac3;

short ac4;

short ac5;

short ac6;

short b1;

short b2;

short mb;

short mc;

short md;

void Some_Nop()

{

_nop_();

}

void Delay_ms(uchar i)

{

uint j;

for(;i>0;i--)

for(j=0;j<124;j );

}

void Delay_s() //延时1s

{

uchar i;

for(i=0;i<20;i )

{

TH0=0x4c;

TL0=0x00;

TR0=1;

while(TF0==0);TF0=0;

TR0=0;

}

/*************** I2C *******************/

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

void I2C_init() //I2C初始化

{

SDA=1;

SCL=1;

}

void I2C_Start() //I2C开始

{

SDA=1;

Some_Nop();

SCL=1;

Some_Nop();

SDA=0;

Some_Nop();

SCL=0;

_nop_();

}

void I2C_Stop() //I2C结束

{

SDA=0;

Some_Nop();

SCL=1;

Some_Nop();

SDA=1;

Some_Nop();

}

void I2C_ACK(bit a)

{

if(a==1) SDA=0; /*在此发出响应或非响应信号，ack=1,发送数据正常;ack=0表示被控器没有回应或损坏。 */

else SDA=1;

_nop_();

SCL=1;

Some_Nop(); //保持数据时间 , 即SCL时间大于4.7μs

SCL=0; //清时钟线，钳住I2C继续接收总线

_nop_();

}

void I2C_WriteByte(uint date) //I2C主机写从机地址，命令

{

uint i;

SCL=0;

Some_Nop();

for(i=0;i<8;i )

{

if(date&0x80) SDA=1; /*判断发送位*/

elseSDA=0;

_nop_();

SCL=1; /*时钟线高，通知被控器接收数据位*/

date<<=1;

Some_Nop();

SCL=0;

}

SDA=1; //释放SDA，接收应答

_nop_();

}

unsigned int I2C_ReadByte() //I2C读从机发送的数据

{

uchar i;

uint k=0;

SDA=1;

for(i=0;i<8;i )

{

SCL=0;

Some_Nop();

SCL=1;

if(SDA==1) k |=0x01; /*读取数据位，将接收到的数据位放入k中 */

k = k << 1;

}

SCL=0;

return k;

}

/* 读出BMP180内部数据,MSB、LSB */

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

int Multiple_read0(uchar ST_Address)

{

//uchar st_Address;

long _data0;

long MSB=0;

long LSB=0;

<>I2C_Start(); //起始信号

I2C_WriteByte(0xee); //发送设备地址,写信号

I2C_ACK(1); //应答

I2C_WriteByte(ST_Address); //发送存储单元地址

I2C_ACK(1); //应答

I2C_Start(); //重新起始信号

I2C_WriteByte(0xef); //发送设备地址+读信号

I2C_ACK(1); //应答

MSB = I2C_ReadByte();

I2C_ACK(1); //应答

LSB = I2C_ReadByte();

I2C_ACK(0);

I2C_Stop();

_data0 = (MSB << 8)|(LSB);

return _data0;

}

void Init_BMP180() //BMP180初始化

{

ac1 = Multiple_read0(0xAA);

ac2 = Multiple_read0(0xAC);

ac3 = Multiple_read0(0xAE);

ac4 = Multiple_read0(0xB0);

ac5 = Multiple_read0(0xB2);

ac6 = Multiple_read0(0xB4);

b1 = Multiple_read0(0xB6);

b2 = Multiple_read0(0xB8);

mb = Multiple_read0(0xBA);

mc = Multiple_read0(0xBC);

md = Multiple_read0(0xBE);

}

//**********************读温度**********************

int bmp180ReadTemp(void)

{

int Tempreture = 0;

I2C_Start(); //起始信号

I2C_WriteByte(0xee); //发送设备地址,写信号

I2C_ACK(1);

I2C_WriteByte(0xF4); // 存储单元地址

I2C_ACK(1);

I2C_WriteByte(0x2E); // 向存储单元写入0x2e

I2C_ACK(0);

I2C_Stop(); //发送停止信号

Delay_ms(4); //等待4.5ms

Tempreture = Multiple_read0(0xF6);

//Tempreture = 0x00001111;

return Tempreture;

}

//**********************读气压****************************

long bmp180ReadPressure(void)

{

long Pressure = 0;

long msb=0;

int lsb=0;

int XLSB=0;

I2C_Start(); //起始信号

I2C_WriteByte(0xee); //发送设备地址,写信号

I2C_ACK(1);

I2C_WriteByte(0xF4); // 存储单元地址

I2C_ACK(1);

I2C_WriteByte(0x34+(OSS<<6)); // 向存储单元写入0x34+(OSS<<6)

I2C_ACK(0);

I2C_Stop(); //发送停止信号

Delay_ms(2+2*OSS); //等待

I2C_Start(); //起始信号

I2C_WriteByte(0xee); //发送设备地址,写信号

I2C_ACK(1);

I2C_WriteByte(0xF6);

I2C_ACK(1);

I2C_Start(); //重新起始信号

I2C_WriteByte(0xef); //发送设备地址,读信号

I2C_ACK(1);

msb = I2C_ReadByte();

I2C_ACK(1);

lsb = I2C_ReadByte();

I2C_ACK(1);

XLSB = I2C_ReadByte();

I2C_ACK(0);

I2C_Stop(); //发送停止信号

Pressure = (msb<<16 | lsb<<8 | XLSB)>>(8-OSS);

return Pressure;

}

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

void bmp180_Calculate()

{

long x1, x2, x3, b3, b5, b6, b7, p, ut, up;

unsigned long b4;

ut = bmp180ReadTemp(); // 读取温度数据

up = bmp180ReadPressure(); // 读取压强数据

x1 = ((ut - ac6)*(long)ac5) >> 15;

x2 = ((long) mc << 11) / (x1 + md);

b5 = x1 + x2;

temperature = ((b5 + 8) >> 4);

b6 = b5 - 4000;

// Calculate B3

x1 = (b2 * (b6 * b6)>>12)>>11;

x2 = (ac2 * b6)>>11;

x3 = x1 + x2;

b3 = (((((long)ac1)*4 + x3)<>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;

}

void serial_init() //串口初始化

{

TMOD=0x21; //T1工作方式2,用于波特率发生器

TH1=0xf3; //12MHz 波特率2400bps

TL1=0xf3;

PCON &=0x7f; //波特率不倍增

SCON=0x50; //允许发送接收

ES=1; //允许串口中断

EA=1; //开总中断

TR1=1; //启动波特率发生

}

void putchar(unsigned char c)

{

SBUF=c;

while(!TI); //等待发送完成

TI=0; //清除TI标志，准备下次发送

}

void Next()

{

putchar(0x0d);

putchar(0x0a);

}

int main(void)

{

uchar i;

uchar j;

I2C_init();

Init_BMP180();

serial_init();

while(1)

{

Delay_s();

for(i=0;i<5;i++)

putchar(Comd0[i]); //发送命令0

bmp180_Calculate();

tempre[0]= 0x30+ temperature / 100;

tempre[1]= 0x30+ temperature / 100%10;

tempre[2]= 0x2e;

tempre[3]= 0x30+ temperature % 10;

tempre[4]= 0x60;

tempre[5]= 0x43;

for(j=0;j<6;j++)

putchar(tempre[j]);

Next();

}

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BMP180气压传感器与STC89c51单片机

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