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MODSERIAL and 9th bit (wakeup)

Topic last updated 14 Apr 2011, by Andy K. 1 reply
Andreas Hagele
14 Apr 2011

Hi Andy, another question about the MODSERIAL lib.

I try to implement a protocol that uses the 9th bit as a wakeup bit (ancient Intel comms feature). The mbed needs to detect messages received with the first byte having the 9th bit set.

If I had to send a message like this I would set the parity to force1, send the data byte and then set the parity back to force0. But I need it for receiving. Do I just check of parity errors?

Cheers Andreas

Andy K
14 Apr 2011

Like your other post regarding modserial, you'd probably need to build your own library to handle this. There's nothing in modserial to handle a 9th bit.