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    HITL with voxl 2

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    • T
      Tamas Pal 0 @Tamas Pal 0
      last edited by 16 Aug 2022, 10:59

      @Matthew-Booker
      In the VOXL2 PX4 HITL for software setup on voxl 2 the file voxl-px4-hitl file is missing in the voxl-master branch of github "https://github.com/modalai/px4-firmware/tree/voxl-master". We followed the instructions from "https://docs.modalai.com/voxl2-PX4-hitl/" I have tried this with both ubuntu and debian, results are still the same. Is it like that or there is some error? How to run hitl with voxl 2 as the files are missing.

      1 Reply Last reply Reply Quote 0
      • Z
        Zachary Lowell ModalAI Team
        last edited by 16 Aug 2022, 15:39

        Hi @Tamas-Pal-0 - looks like you are correct in that the voxl-px4-hitl has not been pulled into voxl-master. I would recommend for now switching over to the voxl-dev branch and running with the steps through there. Once it has been pulled into voxl-master, then you can recompile, reflash, and run through it on that branch. Other options as well is you can copy the file voxl-px4-hitl from the voxl-dev branch into your current working voxl-master, recompile, and reflash the voxl2 with the newer firmware containing the correct executable.

        1 Reply Last reply Reply Quote 1
        • T
          Tamas Pal 0
          last edited by 19 Aug 2022, 11:26

          Unable to run this command
          echo 1 | sudo tee /sys/bus/usb-serial/devices/ttyUSB0/latency_timer
          In the terminal it is showing permission denied after running the command
          tamas@tamas:~$ echo 1 | sudo tee /sys/bus/usb-serial/devices/ttyUSB0/latency_timer
          tee: /sys/bus/usb-serial/devices/ttyUSB0/latency_timer: Permission denied
          1

          How to fix the problem?

          1 Reply Last reply Reply Quote 0
          • Z
            Zachary Lowell ModalAI Team
            last edited by 19 Aug 2022, 14:36

            @Tamas-Pal-0 said in HITL with voxl 2:

            0

            This seems like a permissions issue on your end and that your user doesnt have super user permissions.

            T 1 Reply Last reply 24 Aug 2022, 13:26 Reply Quote 0
            • T
              Tamas Pal 0 @Zachary Lowell
              last edited by Tamas Pal 0 24 Aug 2022, 13:39 24 Aug 2022, 13:26

              @Zachary-Lowell

              tamas@tamas:~$ echo 1 | sudo tee /sys/bus/usb-serial/devices/ttyUSB0/latency_timer
              tee: /sys/bus/usb-serial/devices/ttyUSB0/latency_timer: Permission denied
              1
              tamas@tamas:~$ ls /sys/bus/usb-serial/devices/ttyUSB0/latency_timer
              ls: cannot access '/sys/bus/usb-serial/devices/ttyUSB0/latency_timer': No such file or directory
              

              How to fix it ?

              E 1 Reply Last reply 24 Aug 2022, 16:09 Reply Quote 0
              • E
                Eric Katzfey ModalAI Team @Tamas Pal 0
                last edited by 24 Aug 2022, 16:09

                @Tamas-Pal-0 What do you get with ls /dev/ttyUSB*?

                T 1 Reply Last reply 24 Aug 2022, 16:29 Reply Quote 0
                • T
                  Tamas Pal 0 @Eric Katzfey
                  last edited by 24 Aug 2022, 16:29

                  @Eric-Katzfey
                  I got this

                  tamas@tamas:~$ ls /dev/ttyUSB*
                  /dev/ttyUSB0
                  

                  I am unable to modify anything inside /sys/bus/usb-serial/devices/ttyUSB0 with root user also. How to fix it?

                  E 1 Reply Last reply 24 Aug 2022, 16:47 Reply Quote 0
                  • E
                    Eric Katzfey ModalAI Team @Tamas Pal 0
                    last edited by 24 Aug 2022, 16:47

                    @Tamas-Pal-0 I'm not sure. This works in our development environment so something must be different in your environment. What version of Linux are you using? What cable are you using?

                    T 1 Reply Last reply 25 Aug 2022, 04:39 Reply Quote 0
                    • T
                      Tamas Pal 0 @Eric Katzfey
                      last edited by 25 Aug 2022, 04:39

                      @Eric-Katzfey
                      The issue is fixed. It was a hardware issue. I changed the ftdi cable and the issue was solved. The previous FTDI cable was not allowing me to change anything in /sys/bus/usb-serial/devices/ttyUSB0 directory. The file latency_timer was also not there. However with the other cable, there is no such issue. Thank you for your valuable input.

                      1 Reply Last reply Reply Quote 0
                      • T
                        Tamas Pal 0
                        last edited by 26 Aug 2022, 05:57

                        For 3.3v J18 jst port which port of ftdi cable should be used, CTS# or RTS# ?

                        E 1 Reply Last reply 26 Aug 2022, 16:11 Reply Quote 0
                        • E
                          Eric Katzfey ModalAI Team @Tamas Pal 0
                          last edited by 26 Aug 2022, 16:11

                          @Tamas-Pal-0 For UART it is just GND, TX, and RX

                          T 1 Reply Last reply 29 Aug 2022, 02:29 Reply Quote 0
                          • T
                            Tamas Pal 0 @Eric Katzfey
                            last edited by 29 Aug 2022, 02:29

                            @Eric-Katzfey you mean we only have to connect 3 pins in j18 port ?

                            E 1 Reply Last reply 29 Aug 2022, 15:24 Reply Quote 0
                            • E
                              Eric Katzfey ModalAI Team @Tamas Pal 0
                              last edited by 29 Aug 2022, 15:24

                              @Tamas-Pal-0 Yes, the fourth pin is power and we don't want that one.

                              1 Reply Last reply Reply Quote 0
                              • T
                                Tamas Pal 0
                                last edited by 31 Aug 2022, 05:45

                                Is there any way to verify that FTDI cable is connected properly with J18 port ?

                                E 1 Reply Last reply 31 Aug 2022, 16:32 Reply Quote 0
                                • E
                                  Eric Katzfey ModalAI Team @Tamas Pal 0
                                  last edited by Eric Katzfey 31 Aug 2022, 16:33 31 Aug 2022, 16:32

                                  @Tamas-Pal-0 The easiest way would be to recompile the modalai_dsp PX4 driver to add more debug messages. But if you aren't comfortable with that then we'll need to come up with something else.

                                  1 Reply Last reply Reply Quote 0
                                  • T
                                    Tamas Pal 0
                                    last edited by Tamas Pal 0 1 Sept 2022, 05:17 1 Sept 2022, 05:17

                                    How to do that? Is there any other way to this ?

                                    E 1 Reply Last reply 1 Sept 2022, 16:16 Reply Quote 0
                                    • E
                                      Eric Katzfey ModalAI Team @Tamas Pal 0
                                      last edited by 1 Sept 2022, 16:16

                                      @Tamas-Pal-0 The simulator will be sending heartbeat messages out over the serial cable. You can use the screen program to see if anything is coming from voxl 2 in the serial cable.

                                      T 1 Reply Last reply 2 Sept 2022, 05:30 Reply Quote 0
                                      • T
                                        Tamas Pal 0 @Eric Katzfey
                                        last edited by 2 Sept 2022, 05:30

                                        @Eric-Katzfey How to use screen program in this case ?

                                        E 1 Reply Last reply 2 Sept 2022, 16:36 Reply Quote 0
                                        • E
                                          Eric Katzfey ModalAI Team @Tamas Pal 0
                                          last edited by 2 Sept 2022, 16:36

                                          @Tamas-Pal-0 screen is just a standard Linux program. There are many ways to check the output of the serial port. To start, you could always just do cat /dev/ttyUSB0 and see if anything is coming out. This post shows how to get a hex dump: https://superuser.com/questions/1402386/view-serial-device-output-in-console-in-hex

                                          1 Reply Last reply Reply Quote 0
                                          • T
                                            Tamas Pal 0
                                            last edited by Tamas Pal 0 6 Sept 2022, 14:29 6 Sept 2022, 14:28

                                            The problem is solved. The problem was with ftdi cable. Thank you for your valuable inputs

                                            E 1 Reply Last reply 6 Sept 2022, 15:24 Reply Quote 0
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