Arduino-TWI

The TWI library is an abstract interface for I2C device drivers. The library includes a hardware and software bus manager, and example device drivers for I2C Humidity and Temperature Sensor (Si70XX), Remote 8-bit I/O expander (PCF8574/PCF8574A), Digital Pressure Sensor (BMP085), and Single/Multi-Channel 1-Wire Master (DS2482).

The software bus manager implementation of the TWI interface uses the Arduino-GPIO library. Both software and avr hardware bus manager implementations supports repeated start condition and device driver mutex on multi-tasking.

Repeated start condition allows combined write/read operations to one or more devices without releasing the bus and thus with the guarantee that the operation is not interrupted (when using multiple masters).

Device driver mutex allows a task to complete a device driver function in a synchronized manner when using the Arduino-Scheduler.

Version: 1.9

Classes

• Abstract Two-Wire Bus Manager and Device Driver Interface, TWI
• AVR Two-Wire Bus Manager, Hardware::TWI
• SAM Two-Wire Bus Manager, Hardware::TWI
• Software Two-Wire Bus Manager, Software::TWI
• Digital Pressure Sensor, BMP085
• Humidity and Temperature Sensor, Si70XX
• Remote 8-bit I/O expander, PCF8574
• Single/Multi-Channel 1-Wire Master, DS2482-100/800

Example Sketches

• Scanner
• BMP085
• DS2482
• PCF8574
• Si7021

Dependencies

• Arduino-GPIO