contiki-os/contiki — pull request #408 by bthebaudeau (2013-11-08 19:55:45+00:00)
Title: cc2538: uart: Fix crippled output occurring upon lpm_enter()

lpm_enter() must not enter LPM1+ if the UART TX FIFO is not empty. Otherwise,
the UART clock gets disabled, and its TX is broken.

Signed-off-by: Benoît Thébaudeau