BMP180气压传感器驱动代码

#include "BMP180.h" #include "delay.h" #include "I2C2.h" #include "sys.h" #define BMP180_SlaveAddress 0xee //气压传感器器件地址 #define OSS 0 //BMP085使用 #define REG_Pressure 0x34 //oss=0 4.5 //***BMP085使用 long g_result_UT = 0; long g_result_UP = 0; 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; //********************************************************* //读出BMP085内部数据,连续两个 //********************************************************* u16 BMP180_Multiple_read(u8 ST_Address) { u8 msb, lsb; u16 _data; I2C2_Start(); //起始信号 I2C2_Send_Byte(BMP180_SlaveAddress); //发送设备地址+写信号 I2C2_Wait_Ack(); I2C2_Send_Byte(ST_Address); //发送存储单元地址 I2C2_Wait_Ack(); I2C2_Start(); //起始信号 I2C2_Send_Byte(BMP180_SlaveAddress+1); //发送设备地址+读信号 I2C2_Wait_Ack(); msb = I2C2_Read_Byte(1); //BUF[0]存储 lsb = I2C2_Read_Byte(0); //最后一个数据需要回NOACK I2C2_Stop(); //停止信号 delay_ms(5); _data = msb << 8; _data |= lsb; return _data; } //******************************************************************** u16 BMP180_ReadTemp(void) { int cnt = 0; I2C2_Start(); //起始信号 I2C2_Send_Byte(BMP180_SlaveAddress); //发送设备地址+写信号 BMP180_SlaveAddress 0xee 气压传感器器件地址 cnt = 0; while(!I2C2_Wait_Ack()) //这边需要增加超时退出，避免卡死 { cnt++; delay_ms(1); if(cnt>=100)return 0; } I2C2_Send_Byte(0xF4); // write register address cnt = 0; while(!I2C2_Wait_Ack()) //这边需要增加超时退出，避免卡死 { cnt++; delay_ms(1); if(cnt>=100)return 0; } I2C2_Send_Byte(0x2E); // write register data for temp cnt = 0; while(!I2C2_Wait_Ack()) //这边需要增加超时退出，避免卡死 { cnt++; delay_ms(1); if(cnt>=100)return 0; } I2C2_Stop(); //发送停止信号 delay_ms(10); // max time is 4.5ms return BMP180_Multiple_read(0xF6); } //************************************************************* u16 BMP180_ReadPressure(void) { int cnt = 0; I2C2_Start(); //起始信号 I2C2_Send_Byte(BMP180_SlaveAddress); //发送设备地址+写信号 cnt = 0; while(!I2C2_Wait_Ack()) //这边需要增加超时退出，避免卡死 { cnt++; delay_ms(1); if(cnt>=100)return 0; } I2C2_Send_Byte(0xF4); // write register address cnt = 0; while(!I2C2_Wait_Ack()) //这边需要增加超时退出，避免卡死 { cnt++; delay_ms(1); if(cnt>=100)return 0; } I2C2_Send_Byte(0x34); // write register data for pressure cnt = 0; while(!I2C2_Wait_Ack()) //这边需要增加超时退出，避免卡死 { cnt++; delay_ms(1); if(cnt>=100)return 0; } I2C2_Stop(); //发送停止信号 delay_ms(20); // max time is 4.5ms return BMP180_Multiple_read(0xF6);//pressure; } //************************************************************** //初始化BMP085，根据需要请参考pdf进行修改************** void BMP180_Init(void) { I2C2_Init(); ac1 = BMP180_Multiple_read(0xAA); ac2 = BMP180_Multiple_read(0xAC); ac3 = BMP180_Multiple_read(0xAE); ac4 = BMP180_Multiple_read(0xB0); ac5 = BMP180_Multiple_read(0xB2); ac6 = BMP180_Multiple_read(0xB4); b1 = BMP180_Multiple_read(0xB6); b2 = BMP180_Multiple_read(0xB8); mb = BMP180_Multiple_read(0xBA); mc = BMP180_Multiple_read(0xBC); md = BMP180_Multiple_read(0xBE); } //*********************************************************************** void BMP180_Convert(void) { unsigned int ut; unsigned long up; long x1, x2, b5, b6 = -1601, x3, b3, p; unsigned long b4, b7; ut = BMP180_ReadTemp(); // 读取温度 up = BMP180_ReadPressure(); // 读取压强 return pressure; up &= 0x0000FFFF; //************* x1 = (((long)ut - (long)ac6)*(long)ac5) >> 15; x2 = ((long) mc << 11) / (x1 + md); b5 = x1 + x2; g_result_UT = ((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; g_result_UP = p+((x1 + x2 + 3791)>>4); } /**************************************************************** 　　　函数名称：BMP085_Get_Altitude 　　　函数功能：获取海拔高度值 　　　入口参数：无 　　　出口参数：altitude //int型 2字节，当前海拔高度值 　　　备 注： 返回的高度值单位为厘米，调用时再换算成带小数的以米为单位的高度值 *****************************************************************/ /* double BMP085_Get_Altitude() { double altitude; //pressure=(float)pressure; //获取气压值 altitude=44330.0*(1-pow((double)pressure/101325,1/5.255)); //根据芯片手册提供的公式计算海拔高度 //altitude*=100; //转换成厘米单位的高度值，调用时再换算成带小数的高度值，提高精度 return altitude; } */