51单片机读取BMP280 180 280气压值1602显示程序
单片机源程序如下:
- //***************************************
- // BMP085 IIC测试程序
- // 使用单片机STC89C51
- // 晶振:11.0592M
- // 显示:LCD1602
- // 编译环境 Keil uVision2
- // 参考宏晶网站24c04通信程序
- //****************************************
- #include <REG51.H>
- #include <math.h> //Keil library
- #include <stdlib.h> //Keil library
- #include <stdio.h> //Keil library
- #include <INTRINS.H> //Keil library
- #define uchar unsigned char
- #define uint unsigned int
- #define DataPort P0 //LCD1602数据端口
- sbit SCL=P1^0; //IIC时钟引脚定义
- sbit SDA=P1^1; //IIC数据引脚定义
- sbit LCM_RS=P2^4; //LCD1602命令端口
- sbit LCM_RW=P2^5; //LCD1602命令端口
- sbit LCM_EN=P2^6; //LCD1602命令端口
- #define BMP085_SlaveAddress 0xec //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 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 delay(unsigned int k);
- void InitLcd(); //初始化lcd1602
- void WriteDataLCM(uchar dataW);
- void WriteCommandLCM(uchar CMD,uchar Attribc);
- void DisplayOneChar(uchar X,uchar Y,uchar DData);
- 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 Delay5us();
- void Delay5ms();
- void BMP085_Start();
- void BMP085_Stop();
- void BMP085_SendACK(bit ack);
- bit BMP085_RecvACK();
- void BMP085_SendByte(BYTE dat);
- BYTE BMP085_RecvByte();
- void BMP085_ReadPage();
- void BMP085_WritePage();
- //-----------------------------------
- //*********************************************************
- 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;
- }
- /*******************************/
- void delay(unsigned int k)
- {
- unsigned int i,j;
- for(i=0;i<k;i++)
- {
- for(j=0;j<121;j++)
- {;}}
- }
- /*******************************/
- void WaitForEnable(void)
- {
- DataPort=0xff;
- LCM_RS=0;LCM_RW=1;_nop_();
- LCM_EN=1;_nop_();_nop_();
- while(DataPort&0x80);
- LCM_EN=0;
- }
- /*******************************/
- void WriteCommandLCM(uchar CMD,uchar Attribc)
- {
- if(Attribc)WaitForEnable();
- LCM_RS=0;LCM_RW=0;_nop_();
- DataPort=CMD;_nop_();
- LCM_EN=1;_nop_();_nop_();LCM_EN=0;
- }
- /*******************************/
- void WriteDataLCM(uchar dataW)
- {
- WaitForEnable();
- LCM_RS=1;LCM_RW=0;_nop_();
- DataPort=dataW;_nop_();
- LCM_EN=1;_nop_();_nop_();LCM_EN=0;
- }
- /***********************************/
- void InitLcd()
- {
- WriteCommandLCM(0x38,1);
- WriteCommandLCM(0x08,1);
- WriteCommandLCM(0x01,1);
- WriteCommandLCM(0x06,1);
- WriteCommandLCM(0x0c,1);
- }
- /***********************************/
- void DisplayOneChar(uchar X,uchar Y,uchar DData)
- {
- Y&=1;
- X&=15;
- if(Y)X|=0x40;
- X|=0x80;
- WriteCommandLCM(X,0);
- WriteDataLCM(DData);
- }
- /**************************************
- 延时5微秒(STC90C52RC@12M)
- 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_();
- }
- /**************************************
- 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;
- }
- /*
- //单字节写入BMP085内部数据*******************************
- void Single_Write(uchar SlaveAddress,uchar REG_Address,uchar REG_data)
- {
- BMP085_Start(); //起始信号
- BMP085_SendByte(SlaveAddress); //发送设备地址+写信号
- BMP085_SendByte(REG_Address); //内部寄存器地址
- BMP085_SendByte(REG_data); //内部寄存器数据
- BMP085_Stop(); //发送停止信号
- }
- */
- /*
- //单字节读取BMP085内部数据********************************
- uchar Single_Read(uchar REG_Address)
- { uchar REG_data;
- BMP085_Start(); //起始信号
- BMP085_SendByte(BMP085_SlaveAddress); //发送设备地址+写信号
- BMP085_SendByte(REG_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
- REG_data=BMP085_RecvByte(); //读出寄存器数据
- BMP085_SendACK(1);
- BMP085_Stop(); //停止信号
- return REG_data;
- }
- */
- //*********************************************************
- //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(0x22); // write register data for temp
- BMP085_Stop(); //发送停止信号
- delay(10); // max time is 4.5ms
-
- return (long) Multiple_read(0xFa);
- }
- //*************************************************************
- 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(0xF9);
- 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()
- {
- long ut;
- long up;
- long x1, x2, b5, b6, x3, b3, p;
- unsigned long b4, b7;
- long temperature;
- long pressure;
-
- ut = bmp085ReadTemp();
- ut = bmp085ReadTemp(); // 读取温度
- up = bmp085ReadPressure();
- up = bmp085ReadPressure(); // 读取压强
-
- x1 = ((long)ut - ac6) * 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;
- 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);
- 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');
- }
- //*********************************************************
- //******主程序********
- //*********************************************************
- void main()
- {
- delay(50); //上电延时
- InitLcd(); //液晶初始化
- Init_BMP085(); //初始化BMP085
- while(1) //循环
- {
- bmp085Convert();
- delay(100);
- }
- }
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