51单片机实现大气压传感器GY68测量程序 -

#include <reg52.h>
#include <intrins.h>
#include <math.h> //Keil library
#define uint unsigned int
#define uchar unsigned char
#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;
sbit duoji = P1^2;
sbit lcden = P2^1;
sbit rs = P2^2;
sbit key_1 = P3^4;
sbit key_2 = P3^5;
sbit key_3 = P3^6;
sbit key_4 = P3^7;
sbit SCL=P1^0; //IIC时钟引脚定义
sbit SDA=P1^1; //IIC数据引脚定义
uchar count3;
uchar ge,shi,bai,qian,wan,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;
uchar code table1[]="Pressure: HPa";
uchar code table2[]="status: normal ";
uchar code table3[]="status: abnormal";
uchar code table4[]="MQ7: T: ";
uchar code table5[]="Revise success!!";
uchar code table6[]=" Revise Menu ";
void LCD_DISPLAY(uchar num); //LCD显示
void delay(uint z) //毫秒延时
{
uint x,y;
for(x=z;x>0;x--)
for(y=110;y>0;y--);
}
//****************************LCD1602的初始化*******************************
/**************************************************************************/
void write_com(uchar com)//LCD写字节
{
rs=0;
lcden=0;
P0=com;
delay(5);
lcden=1;
delay(5);
lcden=0;
}
void write_date(uchar date)//LCD读字节
{
rs=1;
lcden=0;
P0=date;
delay(5);
lcden=1;
delay(5);
lcden=0;
}
void lcd_sfm(uchar add,int date)//显示位置和数字
{
uchar qian,bai,shi,ge;
qian = date/1000;
bai = date%1000/100;
shi = date%100/10;
ge = date%10;
write_com(0x80+add);
write_date(0x30+qian);
write_date(0x30+bai);
write_date(0x30+shi);
write_date(0x30+ge);
}
void SetCurPosition(uchar X, uchar Y)//设置光标
{
Y &= 0x01;
X &= 0x0F; // 限制X不能大于15，Y不能大于1
if (Y)
{
X |= 0xc0; // 当要显示第二行时地址码:0xc0
}
X |= 0x80; // 第一行的地址码:0x80
write_com(X); // 这里不检测忙信号，发送地址码
//write_com(0x02); //光标归位
write_com(0x0f); //关光标，闪烁
}
void DisplayOneChar(uchar X,uchar Y,uchar DData)
{
Y&=1;
X&=15;
if(Y)X|=0x40;
X|=0x80;
write_com(X);
write_date(DData);
}
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;
}
/**********************************************************************************************
** BMP180初始化及测试函数
**********************************************************************************************/
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 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 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(10); // 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 bmp085Convert()//bmp180转换
{
long up;
long x1, x2, b5, b6, x3, b3, p;
unsigned long b4, b7;
long pressure;
float temp;
int pressure_int;
up = bmp085ReadPressure();
up = bmp085ReadPressure(); // 读取压强
//*************
b6 = b5 - 4000;
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);
temp = (float)pressure / 100.0 + 0.5;//转换为百帕并四舍五入
pressure_int = (int)temp; //强制转换
lcd_sfm(0x09,pressure_int);//显示
}
void init()
{
lcden=0;
write_com(0x38); //打开显示模式设置
write_com(0x0c); //打开显示，光标等等设置未零
write_com(0x06); //当读或写一个字符后地址指针加一，且光标加一，当写一个字符后整频显示左移，
write_com(0x01); //清零指令
write_com(0x80);
TMOD = 0x01;
TH0 = (65536-100)/256;//100us进入一次中断
TL0 = (65536-100)%256;
TR0 = 1;
ET0 = 1;
EA = 0;//开启总中断
}
/**********************************************************************************************
** TIMER0中断服务子函数产生PWM
**********************************************************************************************/
uchar count = 0;
uchar pwm = 15;
void timer0()interrupt 1 using 0
{
TH0 = (65536-100)/256;
TL0 = (65536-100)%256;
count++;
if(count >= 200)
{
count = 0;
}
if(count <= pwm) duoji = 1;
else duoji = 0;
}
/**********************************************************************************************
** 主函数
**********************************************************************************************/
int max_pressure = 910;//大气压阈值
void main()
{
delay(100);//开机延时
init();//初始化
Init_BMP085();//BMP初始化
//lcd_sfm(0x05,666);
LCD_DISPLAY(1);
LCD_DISPLAY(2);
while(1)
{
bmp085Convert();
delay(1000);
}
}
/********************************************************************************************
* LCD显示函数
********************************************************************************************/
void LCD_DISPLAY(uchar num) //LCD显示
{
if(num == 1)
{
//write_com(0x01);
write_com(0x80);
for(count3=0;count3<16;count3++)
{
write_date(table1[count3]); //
delay(5);
}
}
if(num == 2)
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