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I2C interface summary

I2C is the Philips 2 wire interface, used to configure many digital chips. I2C software has the following options:

• Whether we are a master or a slave. Devices that are configured are slaves, the master configures other devices.
• The speed supported. Normal speeds are 100 Kb/s and 400 Kb/s.
• Whether there is a single I2C bus or multiple I2C busses.
• Whether there is a single master or multiple masters.
• Whether clock stretching is supported.

module_i2c_simple

This module supports single master, at 100 or 400, 1000 kbit/s without clock stretching. If multiple I2C busses are required, they should use the same bit rate.

Functionality provided	Resources required		Status
	Ports	Memory
Single master	2	460 bytes	Implemented

The interface comprises four functions, init, rx, reg_read, and reg_write that are called when required. No separate thread is required.

module_i2c_master

This module will support must master, at 100 or 400, 1000 kbit/s with clock stretching on multiple I2C busses. It provides virtually the same interface as module_i2c_simple.2

Functionality provided	Resources required		Status
	Ports	Memory
Multi master	2	900 bytes	Implemented

The interface comprises four functions, init, rx, reg_read, and reg_write that are called when required. No separate thread is required.

module_i2c_slave

To be provided.

module_i2c_single_port

This module supports single master, at 100 or 400, 1000 kbit/s without clock stretching, where both SCL and SDA are shared on a single port (4, 8, 16, or 32 bits wide).

Functionality provided	Resources required		Status
	Ports	Memory
Single master	1	360 bytes	Implemented

The interface comprises four functions, init, rx, reg_read, and reg_write that are called when required. No separate thread is required.

Note that this module is not extensively tested.

module_i2c

This module will no longer be maintained, and new users are encouraged to use the new interface on module_i2c_simple, module_i2c_master, and/or module_i2c_slave.