altos: Use TXE instead of TC for serial on STM32l
authorKeith Packard <keithp@keithp.com>
Wed, 20 Jan 2016 07:53:27 +0000 (23:53 -0800)
committerKeith Packard <keithp@keithp.com>
Mon, 25 Apr 2016 15:49:16 +0000 (11:49 -0400)
Using TXE allows for full-speed communication, rather than waiting for
each byte to be transmitted before inserting the next into the queue.

Signed-off-by: Keith Packard <keithp@keithp.com>

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