BMP180数据手册+STM32例程+51单片机例程 -

#include "BMP180.h"
#include "delay.h"
//////////////////////////////////////////////////////////////////////////////////
//气压传感器BMP180的STM32驱动，本程序只供学习使用
//////////////////////////////////////////////////////////////////////////////////
//初始化IIC
void IIC_Init(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE );
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10|GPIO_Pin_11;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP ; //推挽输出
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOB, &GPIO_InitStructure);
GPIO_SetBits(GPIOB,GPIO_Pin_10|GPIO_Pin_11); //PB10,PB11 输出高
}
//产生IIC起始信号
void IIC_Start(void)
{
SDA_OUT(); //sda线输出
IIC_SDA=1;
IIC_SCL=1;
delay_us(4);
IIC_SDA=0;//START:when CLK is high,DATA change form high to low
delay_us(4);
IIC_SCL=0;//钳住I2C总线，准备发送或接收数据
}
//产生IIC停止信号
void IIC_Stop(void)
{
SDA_OUT();//sda线输出
IIC_SCL=0;
IIC_SDA=0;//STOP:when CLK is high DATA change form low to high
delay_us(4);
IIC_SCL=1;
IIC_SDA=1;//发送I2C总线结束信号
delay_us(4);
}
//等待应答信号到来
//返回值：1，接收应答失败
// 0，接收应答成功
u8 IIC_Wait_Ack(void)
{
u8 ucErrTime=0;
SDA_IN(); //SDA设置为输入
IIC_SDA=1;delay_us(1);
IIC_SCL=1;delay_us(1);
while(READ_SDA)
{
ucErrTime++;
if(ucErrTime>250)
{
IIC_Stop();
return 1;
}
}
IIC_SCL=0;//时钟输出0
return 0;
}
//产生ACK应答
void IIC_Ack(void)
{
IIC_SCL=0;
SDA_OUT();
IIC_SDA=0;
delay_us(2);
IIC_SCL=1;
delay_us(2);
IIC_SCL=0;
}
//不产生ACK应答
void IIC_NAck(void)
{
IIC_SCL=0;
SDA_OUT();
IIC_SDA=1;
delay_us(2);
IIC_SCL=1;
delay_us(2);
IIC_SCL=0;
}
//IIC发送一个字节
//返回从机有无应答
//1，有应答
//0，无应答
void IIC_Send_Byte(u8 txd)
{
u8 t;
SDA_OUT();
IIC_SCL=0;//拉低时钟开始数据传输
for(t=0;t<8;t++)
{
//IIC_SDA=(txd&0x80)>>7;
if((txd&0x80)>>7)
IIC_SDA=1;
else
IIC_SDA=0;
txd<<=1;
delay_us(2); //对TEA5767这三个延时都是必须的
IIC_SCL=1;
delay_us(2);
IIC_SCL=0;
delay_us(2);
}
}
//读1个字节，ack=1时，发送ACK，ack=0，发送nACK
u8 IIC_Read_Byte(unsigned char ack)
{
unsigned char i,receive=0;
SDA_IN();//SDA设置为输入
for(i=0;i<8;i++ )
{
IIC_SCL=0;
delay_us(2);
IIC_SCL=1;
receive<<=1;
if(READ_SDA)receive++;
delay_us(1);
}
if (!ack)
IIC_NAck();//发送nACK
else
IIC_Ack(); //发送ACK
return receive;
}
u8 BMP180_ReadOneByte(u8 ReadAddr)
{
u8 temp=0;
IIC_Start();
IIC_Send_Byte(BMP180_WR_ADDR); //发送写命令
IIC_Wait_Ack();
IIC_Send_Byte(ReadAddr); //发送要读的寄存器地址
IIC_Wait_Ack();
IIC_Start();
IIC_Send_Byte(BMP180_RD_ADDR); //进入接收模式
IIC_Wait_Ack();
temp=IIC_Read_Byte(0);
IIC_Stop();//产生一个停止条件
return temp;
}
// u16 BMP180_ReadTowByte(u8 ReadAddr)
// {
// u16 temp=0;
// IIC_Start();
// IIC_Send_Byte(BMP180_WR_ADDR); //发送写命令
// IIC_Wait_Ack();
// IIC_Send_Byte(ReadAddr); //发送要读的寄存器地址
// IIC_Wait_Ack();
// IIC_Start();
// IIC_Send_Byte(BMP180_RD_ADDR); //进入接收模式
// IIC_Wait_Ack();
// IIC_Send_Byte(BMP180_RD_ADDR); //进入接收模式
// IIC_Wait_Ack();
// temp=IIC_Read_Byte(0);
// IIC_Stop();//产生一个停止条件
// return temp;
//
}
//在AT24CXX指定地址写入一个数据
//WriteAddr :写入数据的目的地址
//DataToWrite:要写入的数据
void BMP180_WriteOneByte(u16 WriteAddr,u8 DataToWrite)
{
IIC_Start();
IIC_Send_Byte(BMP180_WR_ADDR); //发送写命令
IIC_Wait_Ack();
IIC_Send_Byte(WriteAddr); //发送地址
IIC_Wait_Ack();
IIC_Send_Byte(DataToWrite); //发送字节
IIC_Wait_Ack();
IIC_Stop();//产生一个停止条件
delay_us(1);
}
// int BMP180_CRC_Read(u8 addr)
// {
// u16 temp;
// temp = (BMP180_ReadOneByte(addr)<<8)|BMP180_ReadOneByte(addr+1);
// return temp;
//
}
short BMP180_CRC_Read(u8 addr)
{
u8 msb,lsb;
short data;
IIC_Start();
IIC_Send_Byte(BMP180_WR_ADDR); //发送写命令
IIC_Wait_Ack();
IIC_Send_Byte(addr); //发送要读的寄存器地址
IIC_Wait_Ack();
IIC_Start();
IIC_Send_Byte(BMP180_RD_ADDR);
IIC_Wait_Ack();
msb=IIC_Read_Byte(1);
//IIC_Wait_Ack();
lsb=IIC_Read_Byte(0);
//IIC_Wait_Ack();
IIC_Stop();
delay_us(5);
data= msb << 8;
data|= lsb;
return data;
}
u16 BMP085_Get_UT(void)
{
IIC_Start();
IIC_Send_Byte(BMP180_WR_ADDR);//发送写命令
//IIC_Wait_Ack();
IIC_Send_Byte(0xf4); //发送字
//IIC_Wait_Ack();
IIC_Send_Byte(0x2E);
IIC_Stop();
delay_ms(5);
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//#include<intrins.h>
#include<reg52.h>
sbit BMP180_SCL=P0^3;
sbit BMP180_SDA=P0^4;
#define BMP180_SlaveAddress 0xee//定义器件在IIC总线中的从地址
#define OSS 0//Over sampling Setting(note:code is not set up to use other OSS values)
void Init_BMP180();
void BMP180_Calculate();
long BMP180_Temperature=0;//温度值
long BMP180_Pressure=0;//压力值
long BMP180_Height=0;//相对海拔高度值
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 BMP180_Delay5us()//@11.0592MHz
{
unsigned char i;
_nop_();
i=11;
while(--i);
}
void BMP180_Delay4500us()//@11.0592MHz
{
unsigned char i, j;
_nop_();
_nop_();
i = 49;
j = 101;
do
{
while (--j);
} while (--i);
}
void BMP180_IIC_Start()
{
BMP180_SDA=1;//拉高数据线
BMP180_SCL=1;//拉高时钟线
BMP180_Delay5us();//延时
BMP180_SDA=0;//产生下降沿
BMP180_Delay5us();//延时
BMP180_SCL=0;//拉低时钟线
}
void BMP180_IIC_Stop()
{
BMP180_SDA=0;//拉低数据线
BMP180_SCL=1;//拉高时钟线
BMP180_Delay5us();//延时
BMP180_SDA=1;//产生上升沿
BMP180_Delay5us();//延时
}
void BMP180_IIC_SendACK(bit ack)//发送应答信号，参数0：ACK1：NAK
{
BMP180_SDA=ack;//写应答信号
BMP180_SCL=1;//拉高时钟线
BMP180_Delay5us();//延时
BMP180_SCL=0;//拉低时钟线
BMP180_Delay5us();//延时
}
bit BMP180_IIC_ReceiveACK()
{
BMP180_SCL=1;//拉高时钟线
BMP180_Delay5us();//延时
CY=BMP180_SDA;//读应答信号
BMP180_SCL=0;//拉低时钟线
BMP180_Delay5us();//延时
return CY;
}
void BMP180_IIC_SendByte(unsigned char dat)
{
unsigned char i;
for(i=0;i<8;i++)//8位计数器
{
dat<<=1;//移出数据的最高位
BMP180_SDA=CY;//送数据口
BMP180_SCL=1;//拉高时钟线
BMP180_Delay5us();//延时
BMP180_SCL=0;//拉低时钟线
BMP180_Delay5us();//延时
}
BMP180_IIC_ReceiveACK();
}
unsigned char BMP180_IIC_RecvByte()
{
unsigned char i;
unsigned char dat=0;
BMP180_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;
BMP180_SCL=1;//拉高时钟线
BMP180_Delay5us();//延时
dat|=BMP180_SDA;//读数据
BMP180_SCL=0;//拉低时钟线
BMP180_Delay5us();//延时
}
return dat;
}
short BMP180_IIC_MultRead(unsigned char ST_Address)//读取两个字节
{
unsigned char msb,lsb;
short _data;
BMP180_IIC_Start();//起始信号
BMP180_IIC_SendByte(BMP180_SlaveAddress);//发送设备地址+写信号
BMP180_IIC_SendByte(ST_Address);//发送存储单元地址
BMP180_IIC_Start();//起始信号
BMP180_IIC_SendByte(BMP180_SlaveAddress+1);//发送设备地址+读信号
msb=BMP180_IIC_RecvByte();//BUF[0]存储
BMP180_IIC_SendACK(0);//回应ACK
lsb=BMP180_IIC_RecvByte();
BMP180_IIC_SendACK(1);//最后一个数据需要回NOACK
BMP180_IIC_Stop();//停止信号
Delay5ms();
_data=msb<<8;
_data|=lsb;
return _data;
}
long BMP180_Read_Temperature()
{
BMP180_IIC_Start();//起始信号
BMP180_IIC_SendByte(BMP180_SlaveAddress);//发送设备地址+写信号
BMP180_IIC_SendByte(0xF4);//writeregisteraddress
BMP180_IIC_SendByte(0x2E);//writeregisterdatafortemp
BMP180_IIC_Stop();//发送停止信号
Delay_1ms(10);//maxtimeis4.5ms
return (long)BMP180_IIC_MultRead(0xF6);
}
long BMP180_Read_Pressure()
{
long BMP180_Pressure=0;
BMP180_IIC_Start();//起始信号
BMP180_IIC_SendByte(BMP180_SlaveAddress);//发送设备地址+写信号
BMP180_IIC_SendByte(0xF4);//writeregisteraddress
BMP180_IIC_SendByte(0x34);//writeregisterdataforpressure
BMP180_IIC_Stop();//发送停止信号
BMP180_Delay4500us();//max time is 4.5ms
BMP180_Pressure=BMP180_IIC_MultRead(0xF6);
BMP180_Pressure&=0x0000FFFF;
return BMP180_Pressure;
}
void Init_BMP180()//初始化BMP180
{
ac1=BMP180_IIC_MultRead(0xAA);
ac2=BMP180_IIC_MultRead(0xAC);
ac3=BMP180_IIC_MultRead(0xAE);
ac4=BMP180_IIC_MultRead(0xB0);
ac5=BMP180_IIC_MultRead(0xB2);
ac6=BMP180_IIC_MultRead(0xB4);
b1=BMP180_IIC_MultRead(0xB6);
b2=BMP180_IIC_MultRead(0xB8);
mb=BMP180_IIC_MultRead(0xBA);
mc=BMP180_IIC_MultRead(0xBC);
md=BMP180_IIC_MultRead(0xBE);
}
void BMP180_Calculate()
{
unsigned int ut;
unsigned long up;
long x1,x2,b5,b6,x3,b3,p;
unsigned long b4,b7;
ut=BMP180_Read_Temperature();//读取温度
up=BMP180_Read_Pressure();//读取压强
x1=(((long)ut-(long)ac6)*(long)ac5)>>15;
x2=((long)mc<<11)/(x1+md);
b5=x1+x2;
BMP180_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)<<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;
BMP180_Pressure=p+((x1+x2+3791)>>4);
BMP180_Height=(101325-BMP180_Pressure)*9;
}

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