leaflabs/libmaple — pull request #35 by maniacbug (2011-12-13 16:56:42+00:00)
Title: Weaken _read and _write syscalls. 

This makes it easy to implement an
application-specific printf/scanf by overriding those syscalls with
versions which interact with the USART of your choice.

Signed-off-by: maniacbug