I2C Library#

A software defined I2C library that allows you to control an I2C bus via xcore ports. I2C is a two-wire hardware serial interface, first developed by Philips. The components in the library are controlled via C and can either act as I2C master or slave.

The library is compatible with multiple slave devices existing on the same bus. The I2C master component can be used by multiple tasks within the xcore device (each addressing the same or different slave devices).

The library can also be used to implement multiple I2C physical interfaces on a single xcore device simultaneously.

All signals are designed to comply with the timings in the I2C specification.

Note that the following optional parts of the I2C specification are not supported:

  • Multi-master arbitration

  • 10-bit slave addressing

  • General call addressing

  • Software reset

  • START byte

  • Device ID

  • Fast-mode Plus, High-speed mode, Ultra Fast-mode

I2C consists of two signals: a clock line (SCL) and a data line (SDA). Both these signals are open-drain and require external resistors to pull the line up if no device is driving the signal down. The correct value for the resistors can be found in the I2C specification.

All I2C functions can be accessed via the i2c.h header:

#include <i2c.h>