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- // Read 1 byte from the BMP085 at 'address'
- char bmp085Read(unsigned char address)
- {
- unsigned char data;
- Wire.beginTransmission(BMP085_ADDRESS);
- Wire.write(address);
- Wire.endTransmission();
- Wire.requestFrom(BMP085_ADDRESS, 1);
- while(!Wire.available())
- ;
- return Wire.read();
- }
- // Read 2 bytes from the BMP085
- // First byte will be from 'address'
- // Second byte will be from 'address'+1
- int bmp085ReadInt(unsigned char address)
- {
- unsigned char msb, lsb;
- Wire.beginTransmission(BMP085_ADDRESS);
- Wire.write(address);
- Wire.endTransmission();
- Wire.requestFrom(BMP085_ADDRESS, 2);
- while(Wire.available()<2)
- ;
- msb = Wire.read();
- lsb = Wire.read();
- return (int) msb<<8 | lsb;
- }
- // Read the uncompensated temperature value
- unsigned int bmp085ReadUT()
- {
- unsigned int ut;
- // Write 0x2E into Register 0xF4
- // This requests a temperature reading
- Wire.beginTransmission(BMP085_ADDRESS);
- Wire.write(0xF4);
- Wire.write(0x2E);
- Wire.endTransmission();
- // Wait at least 4.5ms
- delay(5);
- // Read two bytes from registers 0xF6 and 0xF7
- ut = bmp085ReadInt(0xF6);
- return ut;
- }
- // Read the uncompensated pressure value
- unsigned long bmp085ReadUP()
- {
- unsigned char msb, lsb, xlsb;
- unsigned long up = 0;
- // Write 0x34+(OSS<<6) into register 0xF4
- // Request a pressure reading w/ oversampling setting
- Wire.beginTransmission(BMP085_ADDRESS);
- Wire.write(0xF4);
- Wire.write(0x34 + (OSS<<6));
- Wire.endTransmission();
- // Wait for conversion, delay time dependent on OSS
- delay(2 + (3<<OSS));
- // Read register 0xF6 (MSB), 0xF7 (LSB), and 0xF8 (XLSB)
- Wire.beginTransmission(BMP085_ADDRESS);
- Wire.write(0xF6);
- Wire.endTransmission();
- Wire.requestFrom(BMP085_ADDRESS, 3);
- // Wait for data to become available
- while(Wire.available() < 3)
- ;
- msb = Wire.read();
- lsb = Wire.read();
- xlsb = Wire.read();
- up = (((unsigned long) msb << 16) | ((unsigned long) lsb << 8) | (unsigned long) xlsb) >> (8-OSS);
- return up;
- }
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