The RX and TX buffers are supplied by the user, so can be any length. Made from scratch, using straighforward Arduino functions. Receive functionality incomplete, no ACK/NACK from master to slaveīased upon XantoI2C. Using compatible standard Arduino functions. Using the Stream class, just like the Arduino Wire library. No delayMicroseconds() between bit transitions.

Breaks some devices on some fast 32-bit processors due to exceeding I2C clock maximum. Yes, TwoWireInterface, SimpleWireInterface, SimpleWireFastInterface are top-level Uses digitalWrite() to set SDA line actively to HIGH instead of relying on passive pullup resistors, which may cause problems on open-drain I2C lines. Provides an adapter class that delegates to other 3rd party libraries. Also provides 2 simple bigbanging implementations. Runs at 100kHz clock speed on a Arduino Uno. No, SoftI2cMaster and FastI2cMaster inherit from I2cMasterBase which is top-level Inherits from TwoWire so SoftI2CMaster inherits the RX/TX buffers used in TwoWire but does not use themĪ single 32-byte buffer is shared between RX and TX. Uses its own fastDigitalWrite() functions to write to port registers directly.

Wire library alternatives