Kevin O'Connor 9572ad4327 tmc_uart: Limit to only one active uart at a time on an mcu ...

The tmcuart_send command increases cpu usage on the micro-controller.
Should multiple tmcuart_send commands be issued at the same time to a
single AVR micro-controller, it could increase the load to the point
that it introduces a failure. It could also lead to tmcuart_send
transmission errors, which would cause retransmission requests, which
further increase the load.

Track and share mutexes so that only one tmcuart_send command can be
active on a single mcu at a time.

Signed-off-by: Kevin O'Connor <kevin@koconnor.net>

2021-03-12 20:51:11 -05:00

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