readByteReg method

int readByteReg(int address, int register, [ BitOrder order = BitOrder.msbLast, RegisterWidth width = RegisterWidth.bits8, ])

Reads a byte from register of the I2C device with the address.

The optional register parameters bit order/width enables 16-bit register.

The bit order depends on the I2C device.

Implementation

int readByteReg(int address, int register,
    [BitOrder order = BitOrder.msbLast,
    RegisterWidth width = RegisterWidth.bits8]) {
  var data = <I2Cmsg>[];
  data.add(I2Cmsg.buffer(
      address, [], [..._adjustRegister(register, order, width)]));
  data.add(I2Cmsg(address, [I2CmsgFlags.i2c_m_rd], 1));
  var result = transfer(data);
  try {
    var ptr = result._messages[1].buf;
    var value = ptr[0];
    return value;
  } finally {
    result.dispose();
  }
}