I strongly recommend that you read Adafruit's guide regarding the BBB's device tree overlay. It really help me put this all together: https://learn.adafruit.com/introduction-to-the-beaglebone-black-device-tree/overview
You will find there why and how to modify your uEnv.txt file in order to enable ttyO1. In mine, the last line looks like this: ... optargs=coherent_pool=1M; capemgr.enable_partno=BB-UART1,BB-SPIDEV0 optargs=coherent_pool=1M; capemgr.enable_partno=BB-UART1,BB-SPIDEV0 optargs=coherent_pool=1M; capemgr.enable_partno=BB-UART1,BB-SPIDEV0 optargs=coherent_pool=1M; capemgr.enable_partno=BB-UART1,BB-SPIDEV0 On Monday, September 15, 2014 4:35:32 PM UTC-4, [email protected] wrote: > > Robert Nelson <[email protected] <javascript:>> wrote: > > On Mon, Sep 15, 2014 at 1:53 PM, <[email protected] <javascript:>> wrote: > > > I am trying to use the Adafruit Python IO library to acces the UARTS > > > on my BBB. > > > > > > According to the Adafruit documentation if I do:- > > > > > > import Adafruit_BBIO.UART as UART > > > UART.setup("UART1") > > > > > > I should then be able to use /dev/tty01, but there isn't a /dev/tty01, > > > only a /dev/tty1. Is this an error in the documentation or is there > > > something more fundamental broken? I don't seem to be having much > > > success using /dev/tty1 or /dev/tty01 anyway. > > > > Sounds like you didn't load the ttyO1 overlay.. > > > > Then /dev/ttyO1 will be available. > > > Could you explain that more simply please!? > > I have since discovered that some serial ports work for me and others > don't, even though *none* of them actually appear to an ls command. > > If I simply do the following in my python program:- > > import Adafruit_BBIO.UART as UART > import serial > > UART.setup("UART1") > > ser = serial.Serial(port = "/dev/ttyO1", baudrate=9600) > > Then it works for UART1, UART2 and UART4 but *doesn't* work for UART3 > and UART5. That's 'works' as in I can write things to the serial port > and it get sent to a remote system, I still can't see the named > /dev/tty0x device. > > I'd expected the Adafruit library to do all that's necessary to make > the port work and be visible. > > > -- > Chris Green > ยท > > -- 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.
