SoftWire | Software I2C implementation for Arduino

SoftWire is a C++ library typically used in Internet of Things (IoT), Arduino applications. SoftWire has no bugs, it has no vulnerabilities, it has a Weak Copyleft License and it has low support. You can download it from GitHub.

SoftWire is a software I2C implementation for Arduino and other Wiring-type environments. It utilises the pinMode(), digitalWrite() and digitalRead() functions. The pins to be used for the serial data (SDA) and serial clock (SCL) control lines can be defined at run-time. Alternatively it is possible to override the functions which control the SDA and SCL lines, and read SDA and SCL, thereby allowing direct port manipulation to be used if preferred. Multiple objects (for multiple software I2C buses) and clock-stretching by slave devices are supported. A timeout feature is included to prevent lockups by faulty or missing hardware. The microcontroller must function as the master device and multiple masters are not supported. Low-level functions can be used to send start, and stop signals, and to read and write data; no buffers are required. In addition high-level functions provide almost direct compatibility with the Wire library. However, the user must first declare transmit and receive buffers, and configure SoftWire to use them before the high-level functions beginTransmission(), endTransmission(), read(), write() and requestFrom () can be used. Notify SoftWire of the buffers by calling the setTxBuffer() and setRxBuffer() functions, passing in a pointer to a byte or character buffer and the size of the buffer. See the ReadDS1307 fort an exmaple of how this is done. It is possible to assign (and reassign) the pins associated with SCL and SDA at run-time using the functions setScl() and setSda().