LInux (Debian) serial /dev/ttyUSB0 connect to pyboard not working



  • Hello,

    We would like to perfrom automatic testing so we plugged many pyboards to usb.
    It founds the device at /dev/ttyUSB0

    However, connecting with:

    screen /dev/ttyUSB0 9600,cs8   
    

    is not working.
    Does anybody succeed to connect using normal linux?

    Thank you



  • @robert-hh Thanks. it is working with 115200.



  • The driver seems to be OK

                root@srv:~# lsusb -t
                /:  Bus 08.Port 1: Dev 1, Class=root_hub, Driver=sunxi-ohci/1p, 12M
                /:  Bus 07.Port 1: Dev 1, Class=root_hub, Driver=sunxi-ohci/1p, 12M
                    |__ Port 1: Dev 3, If 0, Class=Vendor Specific Class, Driver=ftdi_sio, 12M
    
                root@srv:~# dmesg | grep tty
                [    0.000000] Kernel command line: root=UUID=6b997d52-cff8-4d2f-8f7e-f7f294f837ee rootwait rootfstype=ext4 console=tty1 console=ttyS0,115200 hdmi.audio=EDID:0 disp.screen0_output_mode=1920x1080p60 panic=10 consoleblank=0 loglevel=1 ubootpart=757afe49-01 ubootsource=mmc   sunxi_ve_mem_reserve=0 sunxi_g2d_mem_reserve=0 sunxi_fb_mem_reserve=16 cgroup_enable=memory swapaccount=1
                [    0.000000] console [tty1] enabled
                [    0.515005] uart3: ttyS3 at MMIO 0x1c28c00 (irq = 35) is a SUNXI
                [    4.602066] systemd[1]: Expecting device dev-ttyS0.device...
                [    5.340647] systemd[1]: Starting system-getty.slice.
                [    5.341619] systemd[1]: Created slice system-getty.slice.
                [    5.341742] systemd[1]: Starting system-serial\x2dgetty.slice.
                [    5.342527] systemd[1]: Created slice system-serial\x2dgetty.slice.
                [    7.603200] usb 7-1: FTDI USB Serial Device converter now attached to ttyUSB0
                [  582.778334] ftdi_sio ttyUSB0: FTDI USB Serial Device converter now disconnected from ttyUSB0
                [  599.212603] usb 7-1: FTDI USB Serial Device converter now attached to ttyUSB0


  • @Colateral Sorry. Speed is 115200, not 9600



  • @robert-hh said in LInux (Debian) serial /dev/ttyUSB0 connect to pyboard not working:

    sudo screen /dev/ttyUSB0 9600,cs8

    Thanks. We are connected as root... and there is also dialup configured.

    After we 'screen' is executed, the window is going black and no output no input (no python prompter if you press enter) . If we unplug the usb cable, screen is terminated coming back to linux command line.

    It seems that is related with communication.



  • @Colateral The proper access rights may be missing. You have to be in the dialout group. To get there, run the command:
    sudo adduser <your_user_id> dialout
    You have to logout and login to make that effective. As a first test, whether this is the reason, try:
    sudo screen /dev/ttyUSB0 9600,cs8



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