readWordReg method

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

Reads a word from register of the I2C device with the address with the bit order.

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

The bit order depends on the I2C device.

Implementation

int readWordReg(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], 2));
  var result = transfer(data);
  try {
    var ptr = result._messages[1].buf;
    var value = (ptr[(order == BitOrder.msbLast ? 0 : 1)] & 0xff) |
        (ptr[(order == BitOrder.msbLast ? 1 : 0)] & 0xff) << 8;
    return value;
  } finally {
    result.dispose();
  }
}