Client and backend. This class is shared: the same code is compiled into your app and into your server, so everything on this page works in both.

public final class I2cDevice

A device on an I2C bus, opened through Hardware.openI2c(int, int).

The register helpers cover the common sensor convention: write the register address, then read with a repeated start.

I2cDevice bme280 = Hardware.getInstance().openI2c(1, 0x76);
int chipId = bme280.readRegister(0xd0);   // 0x60 on a BME280

Methods

`public int getBus()`	The bus number.
`public int getAddress()`	The 7-bit device address.
`public void write(byte[] data) throwsHardwareException`	Writes `data` in one transaction.
`public byte[] read(int len) throwsHardwareException`	Reads `len` bytes in one transaction.
`public byte[] writeRead(byte[] write, int readLen) throwsHardwareException`	Writes `write`, then reads `readLen` bytes after a repeated start, as a single transaction with no stop condition between them.
`public int readRegister(int register) throwsHardwareException`	Reads one 8-bit register.
`public byte[] readRegisters(int register, int len) throwsHardwareException`	Reads `len` consecutive registers starting at `register`.
`public void writeRegister(int register, int value) throwsHardwareException`	Writes one 8-bit register.
`public void close()`	Releases the device.

public int getBus()

The bus number.

public int getAddress()

The 7-bit device address.

public void write(byte[] data)
throws HardwareException

Writes data in one transaction.

public byte[] read(int len)
throws HardwareException

Reads len bytes in one transaction.

public byte[] writeRead(byte[] write, int readLen)
throws HardwareException

Writes write, then reads readLen bytes after a repeated start, as a single transaction with no stop condition between them.

public int readRegister(int register)
throws HardwareException

Reads one 8-bit register.

public byte[] readRegisters(int register, int len)
throws HardwareException

Reads len consecutive registers starting at register.

public void writeRegister(int register, int value)
throws HardwareException

Writes one 8-bit register.

public void close()

Releases the device. Closing twice is harmless.