From: Baltazár Radics > Sent: 05 May 2022 18:02 > > I want to use a raspberry pi's serial to communicate over a protocol > that uses 9-bit characters, so currently I'm using the stick parity > mode (CMSPAR) and toggling between odd and even parity, then using > tcsetattr with TCSADRAIN as the second argument, which blocks until all > bytes are transmitted. Is there a non-blocking api to do the same > thing, so I can use it from poll / select? (If there's a better way to > do 9 bit character size, that'd be even better. For my protocol, the > 9th bit is only used to tell address bytes from data bytes, so I don't > have to change it often, so I guess my current method isn't too > horrible.) Does anything give the option of generating non-hdlc synchronous data? You might be able to use two bytes to generate a single 9-bit async character or three bytes to generate two 9-bit characters. David - Registered Address Lakeside, Bramley Road, Mount Farm, Milton Keynes, MK1 1PT, UK Registration No: 1397386 (Wales)
