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a52a3d94d3
lpm_enter() must not enter PM1+ if the UART is transmitting. Otherwise, the UART clock gets disabled, and its TX is broken. The commit b8b54a033c67e2dbb98dabda6d1b4c9e64d5db90 had already partially fixed this issue, but it could still occur while transmitting stop bits because, contrary to UART_FR.BUSY, UART_FR.TXFE takes only the data bits into account, not the stop bits. Signed-off-by: Benoît Thébaudeau <benoit.thebaudeau.dev@gmail.com>
The Contiki Operating System
Contiki is an open source operating system that runs on tiny low-power microcontrollers and makes it possible to develop applications that make efficient use of the hardware while providing standardized low-power wireless communication for a range of hardware platforms.
Contiki is used in numerous commercial and non-commercial systems, such as city sound monitoring, street lights, networked electrical power meters, industrial monitoring, radiation monitoring, construction site monitoring, alarm systems, remote house monitoring, and so on.
For more information, see the Contiki website: