Feather M4 DMX

[afox]

Hi all!

I am trying to send DMX packages via an Feather M4, and a custom-made PCB that drives a MAX485 IC.
So far I am using UART with 250000 baud and SERIAL_8N2.
After slightly modifying the Arduino Variation File to use a dedicated SERCOM handler I got some good looking DMX packages.
Unfortunately, I need to adjust the baud for the BREAK frame of a package.
Currently, no DMX light can process my sent DMX packages because of that problem.
I am debugging the signal via a scope to see the timings and also I am able to analyze correct signal sent from a USB DMX interface.

I am setting the baud rate for the BREAK frame as following:
SERCOM5->USART.BAUD.FRAC.FP
SERCOM5->USART.BAUD.FRAC.BAUD

But i am stuck with calculating the right values here...


Thanks in advance!
Regards,
Alex

[adafruit_support_mike]

I'm afraid we don't have any experience with DMX timing. Your best bet would be to check the documentation for the lights you're using and see if you can find a timing schedule.