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-.. _i2c:
-
-|i2c|
-=====
-
-|i2c| is a crude and easy-to-hack serial protocol that requires only
-two wires/channels for communication between Maple and many other
-devices.
-
-.. contents:: Contents
-   :local:
-
-Overview
---------
-
-Communication via |i2c| is broken up into messages.  Every message is
-between a *master* device, which initiates the message, and a *slave*
-device, which responds.
-
-Slaves are addressed using 7-bit addresses (up to 127 unique devices);
-10-bit addressing is also possible.  Every message consists of an
-arbitrary combination of 8-bit reads and writes as requested by the
-master.  Higher level functionality, such as reading a particular
-register value, is achieved by writing to set the memory location then
-reading to pull out the data.
-
-Note that the master/slave designation is on a message-by-message
-basis. Maple can act as both a master (messages initiated by user
-code) and slave device (responding to requests via configurable
-interrupt handlers) at the same time (though slave mode is currently
-unimplemented).
-
-Hardware/Circuit Design
------------------------
-
-.. FIXME [0.1.0] Link to board-specific values (BOARD_I2C1_SDA_PIN, etc.)
-
-Maple boards have two |i2c| ports.  Maples reliably communicate with
-up to a 400kHz clock speed; this doesn't translate into a 400kbps
-data rate except in extreme cases because of addressing and protocol
-overhead.  We have tested clock speeds up to a megahertz and have had
-mixed results; in theory, it could be possible to achieve even higher
-rates, but signal quality degrades rapidly, and the bus becomes
-unreliable.
-
-Proper wiring and pull-up resistor selection are essential when
-incorporating |i2c| into a circuit, especially with data rates above
-100kHz. In the lab, we usually use approximately 5kΩ resistors with
-|vcc| (3.3V) as the high voltage, and try to connect the pullup
-voltage as close to the SDA and SCL pins as possible.  We recommend
-looking at the ST reference website for |i2c| (see the
-:ref:`recommended reading <i2c-recommended-reading>` below), starting
-with a slow clock rate (10kHz), and, if possible, using an
-oscilloscope to debug any issues.
-
-Function Reference
-------------------
-
-Currently, only low-level support in :ref:`libmaple-i2c` exists.  A
-Wiring-style library is planned for a future release.
-
-SMBus
------
-
-The STM32 microcontroller has hardware support for SMBus, but software
-for it is not yet implemented.
-
-.. _i2c-recommended-reading:
-
-Recommended Reading
--------------------
-
-* `I2C Bus <http://www.i2c-bus.org/>`_
-* `Wikipedia: I2C <http://en.wikipedia.org/wiki/I%C2%B2C>`_
-* `Arduino I2C/TWI reference <http://www.arduino.cc/playground/Learning/I2C>`_
-* ST `Application Note on Advanced I2C Usage
-  <http://www.st.com/stonline/products/literature/an/15021.pdf>`_ (PDF)