Docs: Improve i2c.rst.

Slightly reorganize to keep it consistent with the rest of the docs.

1 files changed, 19 insertions, 12 deletions

diff --git a/source/i2c.rst b/source/i2c.rst
index 8f1b26f..670b91d 100644
--- a/source/i2c.rst
+++ b/source/i2c.rst
@@ -4,15 +4,25 @@
 =====
 
 |i2c| is a crude and easy-to-hack serial protocol that requires only
-two wires/channels for communication between many devices.  Every
-message passed on the bus is between a *master* (who initiates the
-message) and a *slave* device.  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.
+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
@@ -20,9 +30,6 @@ code) and slave device (responding to requests via configurable
 interrupt handlers) at the same time (though slave mode is currently
 unimplemented).
 
-.. contents:: Contents
-   :local:
-
 Hardware/Circuit Design
 -----------------------