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    VOXL FPV Racing 4-in-1 ESC with flight core v2 and voxl2

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    • Eric KatzfeyE
      Eric Katzfey ModalAI Team @Jetson Nano
      last edited by

      @Jetson-Nano Are you using PX4 on the flight core v2? If so, what version? What do you mean when you say that it is not recognizing the ESC?

      Jetson NanoJ 1 Reply Last reply Reply Quote 0
      • Jetson NanoJ
        Jetson Nano @Eric Katzfey
        last edited by

        @Eric-Katzfey i am using http://voxl-packages.modalai.com/dists/fc-v2/dev/modalai_fc-v2_1.14.0-2.0.95.px4 version and also tried with http://voxl-packages.modalai.com/dists/fc-v2/dev/modalai_fc-v2_1.14.0-2.0.90.px4.
        The ESC should start blinking blue LED to represent achieving data from FC. It is not happening.

        Eric KatzfeyE 1 Reply Last reply Reply Quote 0
        • Eric KatzfeyE
          Eric Katzfey ModalAI Team @Jetson Nano
          last edited by

          @Jetson-Nano How are the VOXL_ESC parameters set on your FCv2? There could be a UART baud rate mismatch between what FCv2 is using and what the ESC is using.

          Alex KushleyevA Jetson NanoJ 2 Replies Last reply Reply Quote 0
          • Alex KushleyevA
            Alex Kushleyev ModalAI Team @Eric Katzfey
            last edited by Alex Kushleyev

            @Jetson-Nano , if the voxl_esc driver is started by PX4 running on the Flight Core, it should print out debugging information to the UART console. The log below was taken from PX4 running on VOXL2 DSP, but the output should be the same when using Flight Core V2.

            Please also note that the Flight Core (V2), when powered up, starts immediately (as opposed to VOXL2 booting takes a few seconds), so FC V2 will try to detect the ESC before the ESC exits bootloader (which takes 1 second after power is applied) and will fail to detect the ESC. This was fixed in our FC V2 drone config, please check your voxl-esc driver behavior. Here is the commit that added the delay of 1.5 seconds before starting voxl esc driver on FC V2:

            • https://github.com/modalai/px4-firmware/pull/70/commits/55742d298bf9241a2af5aa2c7ba3a26788073356
            • https://github.com/modalai/px4-firmware/pull/70/commits/1c11e2e0ac3fcc19cb45ab59292b3cf5f4fdb348

            (voxl-esc driver log from VOXL2 DSP is below)

            INFO  [muorb] SLPI: VOXL_ESC: Starting VOXL ESC driver
            INFO  [muorb] SLPI: VOXL_ESC: Opening UART ESC device 2, baud rate 2000000
            INFO  [muorb] SLPI: VOXL_ESC: Successfully opened UART ESC device
            INFO  [muorb] SLPI: VOXL_ESC: Detecting ESCs...
            INFO  [muorb] SLPI: VOXL_ESC: 	ESC ID     : 0
            INFO  [muorb] SLPI: VOXL_ESC: 	Board Type : 37: ModalAi 4-in-1 ESC (M0134-1)
            INFO  [muorb] SLPI: VOXL_ESC: 	Unique ID  : 0x203330385246571900480024
            INFO  [muorb] SLPI: VOXL_ESC: 	Firmware   : version   39, hash eb6fb500
            INFO  [muorb] SLPI: VOXL_ESC: 	Bootloader : version  183, hash b4fa2cf8
            INFO  [muorb] SLPI: VOXL_ESC: 	Reply time : 1646us
            INFO  [muorb] SLPI: VOXL_ESC:
            INFO  [muorb] SLPI: VOXL_ESC: 	ESC ID     : 1
            INFO  [muorb] SLPI: VOXL_ESC: 	Board Type : 37: ModalAi 4-in-1 ESC (M0134-1)
            INFO  [muorb] SLPI: VOXL_ESC: 	Unique ID  : 0x2033303852465719004D004D
            INFO  [muorb] SLPI: VOXL_ESC: 	Firmware   : version   39, hash eb6fb500
            INFO  [muorb] SLPI: VOXL_ESC: 	Bootloader : version  183, hash b4fa2cf8
            INFO  [muorb] SLPI: VOXL_ESC: 	Reply time : 621us
            INFO  [muorb] SLPI: VOXL_ESC:
            INFO  [muorb] SLPI: VOXL_ESC: 	ESC ID     : 2
            INFO  [muorb] SLPI: VOXL_ESC: 	Board Type : 37: ModalAi 4-in-1 ESC (M0134-1)
            INFO  [muorb] SLPI: VOXL_ESC: 	Unique ID  : 0x203330385246571900500042
            INFO  [muorb] SLPI: VOXL_ESC: 	Firmware   : version   39, hash eb6fb500
            INFO  [muorb] SLPI: VOXL_ESC: 	Bootloader : versiINFO  [qshell] Send cmd: 'voxl_esc start'
            INFO  [muorb] SLPI: VOXL_ESC: 	Reply time : 1120us
            INFO  [muorb] SLPI: VOXL_ESC:
            INFO  [muorb] SLPI: VOXL_ESC: 	ESC ID     : 3
            INFO  [muorb] SLPI: VOXL_ESC: 	Board Type : 37: ModalAi 4-in-1 ESC (M0134-1)
            INFO  [muorb] SLPI: VOXL_ESC: 	Unique ID  : 0x2033303852465719004D0050
            INFO  [muorb] SLPI: VOXL_ESC: 	Firmware   : version   39, hash eb6fb500
            INFO  [muorb] SLPI: VOXL_ESC: 	Bootloader : version  183, hash b4fa2cf8
            INFO  [muorb] SLPI: VOXL_ESC: 	Reply time : 617us
            INFO  [muorb] SLPI: VOXL_ESC:
            INFO  [muorb] SLPI: VOXL_ESC: Use extened rpm packet : 1
            INFO  [muorb] SLPI: VOXL_ESC: All ESCs successfully detected
            
            Jetson NanoJ 2 Replies Last reply Reply Quote 0
            • Jetson NanoJ
              Jetson Nano @Alex Kushleyev
              last edited by Jetson Nano

              @Alex-Kushleyev Thank you for reverting back. I will verify this and get back.

              I changed the firmware version to the voxl-fpv-dev still the FC is not detecting the ESC.

              if i start esc through voxl_esc start , it is starting

              could please verify the parameters I mentioned.

              nsh> voxl_esc status
              INFO  [voxl_esc] Max update rate: 0 Hz
              INFO  [voxl_esc] Outputs on: no
              INFO  [voxl_esc] UART port: /dev/ttyS4
              INFO  [voxl_esc] UART open: no
              INFO  [voxl_esc] 
              INFO  [voxl_esc] Params: VOXL_ESC_CONFIG: 1
              INFO  [voxl_esc] Params: VOXL_ESC_MODE: 0
              INFO  [voxl_esc] Params: VOXL_ESC_BAUD: 250000
              INFO  [voxl_esc] Params: VOXL_ESC_FUNC1: 101
              INFO  [voxl_esc] Params: VOXL_ESC_FUNC2: 104
              INFO  [voxl_esc] Params: VOXL_ESC_FUNC3: 102
              INFO  [voxl_esc] Params: VOXL_ESC_FUNC4: 103
              INFO  [voxl_esc] Params: VOXL_ESC_SDIR1: 0
              INFO  [voxl_esc] Params: VOXL_ESC_SDIR2: 0
              INFO  [voxl_esc] Params: VOXL_ESC_SDIR3: 0
              INFO  [voxl_esc] Params: VOXL_ESC_SDIR4: 0
              INFO  [voxl_esc] Params: VOXL_ESC_RPM_MIN: 5500
              INFO  [voxl_esc] Params: VOXL_ESC_RPM_MAX: 15000
              INFO  [voxl_esc] Params: VOXL_ESC_T_PERC: 90
              INFO  [voxl_esc] Params: VOXL_ESC_T_DEAD: 20
              INFO  [voxl_esc] Params: VOXL_ESC_T_EXPO: 35
              INFO  [voxl_esc] Params: VOXL_ESC_T_MINF: 0.150000
              INFO  [voxl_esc] Params: VOXL_ESC_T_COSP: 0.990000
              INFO  [voxl_esc] Params: VOXL_ESC_VLOG: 0
              INFO  [voxl_esc] Params: VOXL_ESC_PUB_BST: 1
              INFO  [voxl_esc] Params: VOXL_ESC_T_WARN: 0
              INFO  [voxl_esc] Params: VOXL_ESC_T_OVER: 0
              INFO  [voxl_esc] Params: GPIO_CTL_CH: 0
              INFO  [voxl_esc] 
              INFO  [voxl_esc] -- ID: 0
              INFO  [voxl_esc]    Motor:           1
              INFO  [voxl_esc]    Direction:       1
              INFO  [voxl_esc]    State:           0
              INFO  [voxl_esc]    Requested:       0 RPM
              INFO  [voxl_esc]    Measured:        0 RPM
              INFO  [voxl_esc]    Command Counter: 0
              INFO  [voxl_esc]    Voltage:         0.000000 VDC
              INFO  [voxl_esc] 
              INFO  [voxl_esc] -- ID: 1
              INFO  [voxl_esc]    Motor:           4
              INFO  [voxl_esc]    Direction:       1
              INFO  [voxl_esc]    State:           0
              INFO  [voxl_esc]    Requested:       0 RPM
              INFO  [voxl_esc]    Measured:        0 RPM
              INFO  [voxl_esc]    Command Counter: 0
              INFO  [voxl_esc]    Voltage:         0.000000 VDC
              INFO  [voxl_esc] 
              INFO  [voxl_esc] -- ID: 2
              INFO  [voxl_esc]    Motor:           2
              INFO  [voxl_esc]    Direction:       1
              INFO  [voxl_esc]    State:           0
              INFO  [voxl_esc]    Requested:       0 RPM
              INFO  [voxl_esc]    Measured:        0 RPM
              INFO  [voxl_esc]    Command Counter: 0
              INFO  [voxl_esc]    Voltage:         0.000000 VDC
              INFO  [voxl_esc] 
              INFO  [voxl_esc] -- ID: 3
              INFO  [voxl_esc]    Motor:           3
              INFO  [voxl_esc]    Direction:       1
              INFO  [voxl_esc]    State:           0
              INFO  [voxl_esc]    Requested:       0 RPM
              INFO  [voxl_esc]    Measured:        0 RPM
              INFO  [voxl_esc]    Command Counter: 0
              INFO  [voxl_esc]    Voltage:         0.000000 VDC
              INFO  [voxl_esc] 
              voxl_esc: cycle: 0 events, 0us elapsed, 0.00us avg, min 0us max 0us 0.000us rms
              voxl_esc: output update interval: 0 events, 0.00us avg, min 0us max 0us 0.000us rms
              INFO  [mixer_module] Param prefix: VOXL_ESC
              control latency: 0 events, 0us elapsed, 0.00us avg, min 0us max 0us 0.000us rms
              Channel Configuration:
              Channel 0: func:   0, value: 0, failsafe: 0, disarmed: 0, min: 5500, max: 15000
              Channel 1: func:   0, value: 0, failsafe: 0, disarmed: 0, min: 5500, max: 15000
              Channel 2: func:   0, value: 0, failsafe: 0, disarmed: 0, min: 5500, max: 15000
              Channel 3: func:   0, value: 0, failsafe: 0, disarmed: 0, min: 5500, max: 15000
              
              Alex KushleyevA 1 Reply Last reply Reply Quote 0
              • Jetson NanoJ
                Jetson Nano @Eric Katzfey
                last edited by Jetson Nano

                @Eric-Katzfey @Alex-Kushleyev

                Voxl2 is connected to Flight core v2 through telem 1.
                ESC is connected to flight core through telem 2.
                the parameters are the following

                Screenshot from 2025-04-22 09-41-07.png

                Screenshot from 2025-04-22 09-42-31.png

                Screenshot from 2025-04-22 09-40-50.png

                1 Reply Last reply Reply Quote 0
                • Alex KushleyevA
                  Alex Kushleyev ModalAI Team @Jetson Nano
                  last edited by

                  @Jetson-Nano said in VOXL FPV Racing 4-in-1 ESC with flight core v2 and voxl2:

                  if i start esc through voxl_esc start , it is starting

                  Can you please provide the debug prints that voxl_esc driver outputs when you call voxl_esc start ?

                  Alex

                  Jetson NanoJ 1 Reply Last reply Reply Quote 0
                  • Jetson NanoJ
                    Jetson Nano @Alex Kushleyev
                    last edited by Jetson Nano

                    @Alex-Kushleyev When I run it for sometime it is makes the ESC blink once.
                    then once again if I run the command it gives the following statement
                    Error [voxl_esc] Task already running

                    Alex KushleyevA 1 Reply Last reply Reply Quote 0
                    • Alex KushleyevA
                      Alex Kushleyev ModalAI Team @Jetson Nano
                      last edited by

                      @Jetson-Nano , you can stop the task and run it again or just look at the console output when you power on FC V2, so you see what happens when voxl_esc task prints when it start for the first time.

                      Jetson NanoJ 1 Reply Last reply Reply Quote 0
                      • Jetson NanoJ
                        Jetson Nano @Alex Kushleyev
                        last edited by Jetson Nano

                        @Alex-Kushleyev

                        nsh> voxl_esc stop
                        ERROR [voxl_esc] timeout, forcing stop
                        ERROR [voxl_esc] failed restoring uart to original state
                        ERROR [voxl_esc] error closing uart
                        nsh> voxl_esc start
                        ERROR [px4_work_queue] wq:ttyS4 not available
                        ERROR [px4_work_queue] init failed
                        INFO  [voxl_esc] Starting VOXL ESC driver
                        INFO  [voxl_esc] Params: VOXL_ESC_CONFIG: 1
                        INFO  [voxl_esc] Params: VOXL_ESC_MODE: 0
                        INFO  [voxl_esc] Params: VOXL_ESC_BAUD: 250000
                        INFO  [voxl_esc] Params: VOXL_ESC_FUNC1: 101
                        INFO  [voxl_esc] Params: VOXL_ESC_FUNC2: 104
                        INFO  [voxl_esc] Params: VOXL_ESC_FUNC3: 102
                        INFO  [voxl_esc] Params: VOXL_ESC_FUNC4: 103
                        INFO  [voxl_esc] Params: VOXL_ESC_SDIR1: 0
                        INFO  [voxl_esc] Params: VOXL_ESC_SDIR2: 0
                        INFO  [voxl_esc] Params: VOXL_ESC_SDIR3: 0
                        INFO  [voxl_esc] Params: VOXL_ESC_SDIR4: 0
                        INFO  [voxl_esc] Params: VOXL_ESC_RPM_MIN: 5500
                        INFO  [voxl_esc] Params: VOXL_ESC_RPM_MAX: 15000
                        INFO  [voxl_esc] Params: VOXL_ESC_T_PERC: 90
                        INFO  [voxl_esc] Params: VOXL_ESC_T_DEAD: 20
                        INFO  [voxl_esc] Params: VOXL_ESC_T_EXPO: 35
                        INFO  [voxl_esc] Params: VOXL_ESC_T_MINF: 0.150000
                        INFO  [voxl_esc] Params: VOXL_ESC_T_COSP: 0.990000
                        INFO  [voxl_esc] Params: VOXL_ESC_VLOG: 0
                        INFO  [voxl_esc] Params: VOXL_ESC_PUB_BST: 1
                        INFO  [voxl_esc] Params: VOXL_ESC_T_WARN: 0
                        INFO  [voxl_esc] Params: VOXL_ESC_T_OVER: 0
                        INFO  [voxl_esc] Params: GPIO_CTL_CH: 0
                        nsh> 
                        

                        can you verify whether it is a parameter related error. I have mentioned the parameters in the above thread.

                        Alex KushleyevA 1 Reply Last reply Reply Quote 0
                        • Alex KushleyevA
                          Alex Kushleyev ModalAI Team @Jetson Nano
                          last edited by

                          @Jetson-Nano said in VOXL FPV Racing 4-in-1 ESC with flight core v2 and voxl2:

                          ERROR [px4_work_queue] wq:ttyS4 not available

                          the error above seems like an issue.

                          Also is your ESC actually running at 250K baud rate? Did you verify this using voxl-esc tools?

                          Additionally, it seems the voxl_esc driver does not produce the prints I was expecting, let me check to make sure the FC V2 is using the latest voxl_esc implementation.

                          Alex

                          Jetson NanoJ 1 Reply Last reply Reply Quote 0
                          • Jetson NanoJ
                            Jetson Nano @Alex Kushleyev
                            last edited by Jetson Nano

                            @Alex-Kushleyev
                            Yes it is running in the 250k baud rate.
                            I did not verify with the voxl-esc tools. I directly connected it to the FC.
                            I am using the voxl-fpv-dev version of px4

                            Alex KushleyevA 1 Reply Last reply Reply Quote 0
                            • Alex KushleyevA
                              Alex Kushleyev ModalAI Team @Jetson Nano
                              last edited by

                              @Jetson-Nano , what do you mean voxl-fpv-dev version of px4? can you provide the link to the exact release?

                              Jetson NanoJ 1 Reply Last reply Reply Quote 0
                              • Jetson NanoJ
                                Jetson Nano @Alex Kushleyev
                                last edited by

                                @Alex-Kushleyev
                                https://github.com/modalai/px4-firmware/tree/voxl-fpv-dev

                                1 Reply Last reply Reply Quote 0
                                • Jetson NanoJ
                                  Jetson Nano @Alex Kushleyev
                                  last edited by Jetson Nano

                                  @Alex-Kushleyev here you had mentioned a version where the change has been made with respect to the delay.
                                  https://forum.modalai.com/post/21951

                                  Alex KushleyevA 1 Reply Last reply Reply Quote 0
                                  • Alex KushleyevA
                                    Alex Kushleyev ModalAI Team @Jetson Nano
                                    last edited by

                                    @Jetson-Nano , from your above screen shot from QGC, it seems you are using TELEM2 for MAV0, so that is probably why the port is not able to open. You should probably set MAV_0_CONFIG to Disabled...

                                    ERROR [px4_work_queue] wq:ttyS4 not available
                                    
                                    Jetson NanoJ 1 Reply Last reply Reply Quote 0
                                    • Jetson NanoJ
                                      Jetson Nano @Alex Kushleyev
                                      last edited by

                                      @Alex-Kushleyev Thank you for the help . I changed the parameter and now the ESC has been initialised. motor are able to rotate.
                                      Also is there any other parameter i should be aware of

                                      Alex KushleyevA 1 Reply Last reply Reply Quote 0
                                      • Alex KushleyevA
                                        Alex Kushleyev ModalAI Team @Jetson Nano
                                        last edited by

                                        @Jetson-Nano , since you are probably using a custom motor and propeller you should:

                                        • first of all, update the ESC firmware to the latest
                                        • calibrate the ESC for the motor/propeller and upload params
                                        • update min and max rpm params in PX4 because they are used to scale the control output
                                        • set the correct motor mapping and direction in px4 params
                                        • i also recommend updating the baud rate to at least 921600 (or 1M). We are using 2Mbit for all latest ESC configs now. This reduces latency and ensures that you don't have ESC packet drops (depending on the update rate of your flight control loop)

                                        In order to perform the updates and tuning, you will need to use voxl-esc tools. Please see the following page for more info: https://docs.modalai.com/voxl-escs/faq/

                                        Alex

                                        Jetson NanoJ 1 Reply Last reply Reply Quote 0
                                        • Jetson NanoJ
                                          Jetson Nano @Alex Kushleyev
                                          last edited by

                                          @Alex-Kushleyev Thank you for the support. I will make the changes you have mentioned.

                                          1 Reply Last reply Reply Quote 0
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