Alexandru Gagniuc 1a160d794b lm4f: Add basic UART echo example ...

Nothing fancy, just a demonstration of the blocking send and recieve.

Also update libopencm3 submodule to include the lm4f UART API.

Signed-off-by: Alexandru Gagniuc <mr.nuke.me@gmail.com>

2013-05-10 15:42:16 -05:00

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