On Friday, September 20, 2019 at 12:13:35 PM UTC-4, ama FTCompany wrote: > > Jason, > > I try to use the latest image from beagleboard.org for pocket beagle > Octavo. > > After bootup, I try to do the loopback test on UART0, TX<--->RX > > screen /dev/ttyO0 >
Can you provide better background on what you've wired-up? Just short P1.29 and P1.31? UART0, by default, will host the console, so Linux has a tty open on it. If you want to test a simple loop-back, you might be better off using UART4. Otherwise, shut down the getty on ttyS0. I forget the exact, but something like: sudo systemctl stop serial-getty@ttyS0 > > but I suppose to input text from keyboard, and screen should display the > output. but nothing happen, and I could not exit from the command line, > even by ctrl+z, ctrl+c. > Where is your shell? Logged in via Cloud9 IDE? To stop screen, you need to use CTRL+A, q. > > The ultimate target I try to use the UART0 or UART4 to communicate with RF > module SX868, which has the UART as well. > Cool. That should be pretty straight-forward. > > But I failed, So I try to test the pocket beagel first, it looks like it > has issue. > > Please help to check > We'll get you there. Showing up on https://beagleboard.org/chat might be good for some live help. Ping me, 'jkridner'. > > Aaron Ma > Houston, TX > > >>>> -- 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]. To view this discussion on the web visit https://groups.google.com/d/msgid/beagleboard/e9033286-c735-4f9f-9451-7dd0ce6af739%40googlegroups.com.
