Matek f405 wing + NeoPixel

AndreyI · December 6, 2019, 3:48pm

Hi!
Connect to Matek f405 Wing, RGB LED WS2812B. in 7 servo channel connected servo “VTailLeft”, in 8 servo channel connect WS2812B. As soon as I set the parameter SERVO 8_FUNCTION = 120, the LEDs start to work, but stops working 7 servo channel.
Is it a bug or a feature of f405?

iampete · December 6, 2019, 5:32pm

I think this is expected because servo outputs 7,8 and 8 all share timer 1

github.com

ArduPilot/ardupilot/blob/b055eb8889faf378bf868ea4fdc7238b408ae8ae/libraries/AP_HAL_ChibiOS/hwdef/MatekF405-Wing/hwdef.dat#L85


PA11 OTG_FS_DM OTG1
PA12 OTG_FS_DP OTG1


PA14 LED_BLUE OUTPUT LOW GPIO(0)
PA13 LED_GREEN OUTPUT LOW GPIO(1) # optional


define HAL_GPIO_A_LED_PIN 0
define HAL_GPIO_B_LED_PIN 1




#pwm output
PB7  TIM4_CH2  TIM4 PWM(1) GPIO(50)
PB6  TIM4_CH1  TIM4 PWM(2) GPIO(51)
PB0  TIM3_CH3  TIM3 PWM(3) GPIO(52)
PB1  TIM3_CH4  TIM3 PWM(4) GPIO(53)
PC8  TIM8_CH3  TIM8 PWM(5) GPIO(54)
PC9  TIM8_CH4  TIM8 PWM(6) GPIO(55)
PB14 TIM1_CH2N TIM1 PWM(7) GPIO(56)
PB15 TIM1_CH3N TIM1 PWM(8) GPIO(57)
PA8  TIM1_CH1  TIM1 PWM(9) GPIO(58)

AndreyI · December 6, 2019, 5:48pm

Thanks!
I found the answer to my question here: https://ardupilot.org/copter/docs/common-matekf405-wing.html#dshot-capability

AndreyI · December 22, 2019, 2:01pm

Hi!

And you can ask the developers in the release for Matek F405 Wing, change the file " hwdef.dat"

pwm output

PB7 TIM4_CH2 TIM4 PWM(1) GPIO(50)
PB6 TIM4_CR1 TIM4 PWM (2) GPIO (51)
TIM3_CH3 PB0 TIM3 PWM(3) GPIO(52)
TIM3_CH4 PB1 TIM3 PWM(4) GPIO(53)
PC8 TIM8_CH3 TIM8 PWM(5) GPIO(54)
PC9 TIM8_CH4 TIM8 PWM(6) GPIO(55)
PB14 TIM8_CH2N TIM8 PWM(7) GPIO(56)
PB15 TIM1_CH3N TIM1 PWM(8) GPIO(57)
PA8 TIM1_CR1 IR1 PWM(9) GPIO(58)

So it is more convenient to use NeoPixel. An 8-channel diode can be connected, and channels 1-7 can still be used to connect servos.

iampete · December 22, 2019, 3:36pm

feel free to open a PR against master.

https://ardupilot.org/dev/docs/submitting-patches-back-to-master.html

dkemxr · December 22, 2019, 3:47pm

Just a question for my own knowledge. Is this simply a matter of changing the hwdef and re-compiling? I thought it was more hardware dependent but I don’t really know hence the question.

AndreyI · December 22, 2019, 4:34pm

I recompiled by changing hwdef, everything works fine.

dkemxr · December 22, 2019, 4:35pm

Thank you for the info!

AndreyI · December 22, 2019, 4:44pm

It’s too complicated for me…

iampete · December 22, 2019, 7:13pm

If you can compile the code, doing a git PR is not too complicated. Have you committed your changes to GitHub somewhere?

AndreyI · December 23, 2019, 4:05am

As I understand, all changes only at me on a disk. Recompiled according to these instructions:
https://ardupilot.org/dev/docs/building-setup-windows-cygwin.html#setting-up-the-waf-build-environment-on-windows-using-cygwin

github.com

ArduPilot/ardupilot/blob/master/BUILD.md

# Building ArduPilot #

## Get the Source

Clone the project from GitHub:
```sh
git clone --recursive https://github.com/ArduPilot/ardupilot.git
cd ardupilot
```

You can also read more about the build system in the
[Waf Book](https://waf.io/book/).

waf should always be called from the locally cloned ardupilot root directory for the local branch you are trying to build from.

**Note**
Do not run `waf` with `sudo`!  This leads to permission and environment problems.

## Basic usage ##

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iampete · December 23, 2019, 5:52pm

On windows i would suggest setting up github-desktop just point it to your ardupilot directory, it should then spot the changes and let you commit them and publish the branch. Then you can create the PR from the autopilot GitHub web-page.

xixijoe · June 24, 2021, 2:16pm

@AndreyI
Servo8 is the LED pad? I also have F405wing. set SERVO 8_FUNCTION = 120. but it did not work.