Baud rates need to be in a multiple of the clock rate. Would 921600 work ? how about 1382400 ?
Remember the highest supported baud rate is 3686400 (AM335X Technical Reference Manual, Table 19-6). But most driver chips like max232 can only handle 1mbps so at higher baud rates you might only get ttl level signals to go that high of a speed. Depending on the length of your wires you may need differential signaling as well (rs485) On 10/24/2014 9:26 AM, Gabe Knuth wrote: > I'm trying to use a BBB Rev C running Debian to connect to UART4 > (ttyO4) at a 1000000 baud, but I can't make it work. The device I'm > connecting to requires it to be that high. I tried a different device > that works at I'm a Windows guy that's knee deep in Linux and ankle > deep in embedded Linux. I've got another device that runs at 460800 > (UART1 ttyO1 if that matters) which works fine, so I'm starting to > think it has something to do with the speed. > > I've read a lot of posts that suggest that the 3.8 kernel can't > support it, but that it might be "easy" to change, but after that I > lose track of what folks are talking about (specifically this > post: https://groups.google.com/forum/#!topic/beagleboard/EEe7xAkCPkQ). As > I read it, the 3.11 kernel supports higher speeds, but it's not > supported on the BBB. I'm a Windows guy that's knee deep in Linux and > ankle deep in embedded, so this is not in my wheelhouse (but fun to > learn). > > The bottom line here is: can I connect to hardware at 1000000 baud on > the BBB running Debian Wheezy? If not out of the box is there a way to > make it work without running an unsupported kernel on it? > > Thanks, > Gabe > -- > For more options, visit http://beagleboard.org/discuss > --- > You received this message because you are subscribed to the Google > Groups "BeagleBoard" group. > To unsubscribe from this group and stop receiving emails from it, send > an email to [email protected] > <mailto:[email protected]>. > For more options, visit https://groups.google.com/d/optout. -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/d/optout.
