AUX1 and AUX5 fault when using serial LEDs

Cube Autopilot
1

Hi all,

I have some serial LEDs that I would like to drive using a LUA script. I’m using

local chan = SRV_Channels:find_channel(94)
if not chan then
  return
end
local num_leds = 6
serialLED:set_num_neopixel_rgb(chan, num_leds)
chan = chan + 1;

to init the LEDs and I’m using

serialLED:set_RGB(chan, 0, R[1], G[1], B[1])
serialLED:set_RGB(chan, 1, R[2], G[2], B[2])
serialLED:set_RGB(chan, 2, R[3], G[3], B[3])
serialLED:set_RGB(chan, 3, R[4], G[4], B[4])
serialLED:set_RGB(chan, 4, R[5], G[5], B[5])
serialLED:set_RGB(chan, 5, R[6], G[6], B[6])
serialLED:send(chan)

to set the LED’s collor.

This works fine when I set

SERVO10_FUNCTION = 94

or

SERVO11_FUNCTION = 94

or

SERVO12_FUNCTION = 94

or

SERVO14_FUNCTION = 94

However, it does not work when I set

SERVO9_FUNCTION = 94

or

SERVO13_FUNCTION = 94

Am I missing a servo parameter (that might disable SERVO9 and SERVO13)?

PS I noticed that SERVO9 and SERVO13 are both the first ports within their PWM group.

Thanks in advance!

Best regards,
Max

2

What if you use more than just 94 ? You have all the way through to 109, assign one sripting reference to each AUX output.
I havent tried it but, just trying to help.

3

Hi @xfacta,
Thanks for your message! Sorry for my late reply, I was on holiday.
I have tried 98 (instead of 94) and this shows the exact same behavior.

4

Did you try assigning 94, 95, 96… and so on to each AUX function and adjusting your script to handle each individually?

5

Hi @xfacta,

Sorry for my very late reply! I finally found some time to investigate this further.

I think that I found the problem. In the code below, I incremented the chan variable after calling the serialLED:set_num_neopixel_rgb(chan, num_leds) function. When I increment the chan variable before calling the serialLED:set_num_neopixel_rgb(chan, num_leds), everything works fine.

local chan = SRV_Channels:find_channel(94)
if not chan then
  return
end
local num_leds = 6
serialLED:set_num_neopixel_rgb(chan, num_leds)
chan = chan + 1;

So, the code becomes this:

local chan = SRV_Channels:find_channel(94)
if not chan then
  return
end
local num_leds = 6
chan = chan + 1;
serialLED:set_num_neopixel_rgb(chan, num_leds)

I’m not quite sure why I have made such a stupid mistake. This might have been changed in some Ardupilot software update, because I remember that the incrementation should be done after serialLED:set_num_neopixel_rgb(chan, num_leds). Anyway, it works now!