I2C

I2C bus communication devices.

Instrument and Abstract Driver

I2CInterface	I2C interface supporting register-based and command-based devices.
I2CDriverBase	Vendor I2C-adapter driver contract.

Vendor Drivers

Vendor	Model	Description
Total Phase	Aardvark	Total Phase Aardvark I2C/SPI host adapter.

Types & Configuration

SystemDefinition	Top-level container of all I2C device definitions, passed to I2CInterface.
RegisterDevice	Register-based I2C device (e.g. a GPIO expander).
CommandDevice	Command-based I2C device (e.g. an ADC).
RegisterDef	I2C register: address, data format, power-on default, byte order, and named bit fields.
CommandDef	A named command enum whose members are OR'd together when sent.
FieldDef	A contiguous bit field within a register (e.g. FieldDef("mode", lsb=3, width_bits=2) for bits [4:3]).
DataFormat	How to extract logical data from an I2C transfer and convert to physical units.
ScalingFunction	Convert between raw register integers and physical units (forward and inverse).
LinearScaling	Linear scaling: physical = offset + gain * raw.
CustomScaling	User-defined scaling.

---

Errors raised by these methods are documented in Exceptions.