Re:TouCAN: abort transmission

I do something similar, checking if the transmission has completed in a
timer thread, and if it hasn't then de-activating it by writing the
control register with MBCTL_TXIDLE (0x80). I must admit I haven't
checked if the transmission completes before it de-activates, or if it
just steps on it mid transmission - In my case, the timeout should only
occur if there is no other system providing the ACK, and as there is no
other system it doesn't really matter to much if I screw up the packet
halfway through.



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