[Bug]: RRF 3.5.2 - LED strips connected to io ports on SAMC21 (1LC, 1XD) set LEDs incorrectly, all white

[droftarts]

Forum thread: https://forum.duet3d.com/topic/35855/led-voron-ws2812e/8

I wired up my usual 'test' RGB LEDs (that work well with 3.3V signalling) to a Mini 5+ with 1LC running RRF 3.5.2, using 1LC IO_0.out (the only PWM IO pin on a 1LC). To configure, I sent:

M950 E0 C"121.io0.out" U3 T1

To turn on just reds, I sent

M150 E0 R255 U0 B0 S3

However, all three LEDs come on white. After this, any command I send doesn't change this. I think this is a similar timing issue bug as we recently had on the 6HC .

6HC similar issue: https://github.com/Duet3D/RepRapFirmware/issues/996 Duet 2 similar issue: https://github.com/Duet3D/RepRapFirmware/issues/969 Duet 2 Maestro also appears to have the same issue, though no issue has been raised for this.

[dc42]

Fixed in 3.6-dev

[dc42]

Back-ported to 3.5-dev.