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

[Alex Kushleyev]

@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 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 Kushleyev]

@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 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 Kushleyev]

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

[Jetson Nano]

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

[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 Kushleyev]

@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 Nano]

@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 Kushleyev]

@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 Nano]

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

[Jetson Nano]

hey @Alex-Kushleyev
I am facing the same issue again, the ESC is not initialising when connected through fc v2 , i have followed all the suggestions you mentioned earlier. the FC as well as VOXL 2 is powered through ESC.

nsh> voxl_esc start
INFO  [voxl_esc] 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: 2000000
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> voxl_esc status
INFO  [voxl_esc] not running
nsh> voxl_esc start
INFO  [voxl_esc] 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: 2000000
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> 

[Alex Kushleyev]

@Jetson-Nano ,

The primary causes of ESC not being detected by the FC (aside from hardware / wiring issues) is using incorrect UART port or incorrect baud rate. So you should make sure the ESC is running the latest firmware, double check the params that you want to use on the ESC (for your motor / prop) and you can also set the ESC baud rate in the ESC params. You should set up your ESC (using voxl-esc tools) before plugging it into your FC, so that you know exactly what your ESC is set up to do and then you just need to match your PX4 params to what you set in the ESC (baud rate, rpm limits, and use correct UART port).

Alex

[Jetson Nano]

@Alex-Kushleyev Thank you for reverting, I didnt change anything with respect to the fc or ESC, the firmware is the same.
could you help me with understanding why it was working earlier , it is not now.
The firmware of the FC is voxl-fpv-dev version, and when i tried to build again it is giving error, and not building.
I still dont know whether the issue is with respect to FC firmware or ESC

[Alex Kushleyev]

@Jetson-Nano , please confirm the ESC is working by using a usb to serial connection directly to the esc and voxl-esc Python tools on a Linux PC or VM.

You can run simple commands to detect the esc and perform spin tests if needed, this is all documented.

VOXL ESC FAQ

ModalAI technical documentation for VOXL and VOXL 2 Companion Computers for PX4 and ArduPilot Obstacle Avoidance and GPS-denied navigation, assembled in the USA

ModalAI Technical Docs (docs.modalai.com)

If the esc is ok, then you will need to double check the FC v2 setup.

Alex

[Jetson Nano]

Hey @Alex-Kushleyev , for the same setup I mentioned above my esc is not starting by default, while I run voxl_esc start in mavlink console, it starts and works.
what could be the reason for such behaviour. Please could you help me out

[Alex Kushleyev]

@Jetson-Nano , this is likely related to the fact that the FC starts quicker than the ESC bootloader's 1s wait time. We discussed this before.

So if you are saying that delaying the start of voxl_esc driver in px4 on your FC solves the problem, then the issue is exactly that.

Please delay the start of the voxl_esc driver in your px4 start-up script, for example you can see it at the bottom of the script here : https://github.com/modalai/px4-firmware/blob/bugfix-fpv-rev0-airframe/boards/modalai/fc-v2/init/rc.board_sensors

if param greater VOXL_ESC_CONFIG 0
then
	usleep 1500000
	voxl_esc start
fi

[Jetson Nano]

@Alex-Kushleyev I have already tried it, It was working fine earlier. since past 2 days the behaviour has changed, I have verified everything else and nothing else could be a reason for such behaviour , I even played around with delay to verify it, still the same issue.
please excuse me for repeating the questions but is there any other reason that can cause this issue.

[Alex Kushleyev]

@Jetson-Nano ,

Thank you for clarifying. Unfortunately, since I don't know what you changed between the working and non-working condition, it is hard to help. Also, since you are indicating that the ESC is responding if you manually start the esc driver, then the ESC itself should still be functional.

Please try to backtrack your changes until you have a working setup again.

Alex

[Jetson Nano]

@Alex-Kushleyev , I will backtrack the steps and try re-configuring the setup.