Fastled: ATMega4809 support?

[Mnjongen]

Is the ATMega4809 (Arduino nano every) going to be supported? I noticed that the Arduino nano IOT was already added but not the nano every.

I tried adding it myself but I couldn't understand the fastpin_avr.h file.

[jvcop]

Support for the Arduino Nano Every would be wonderful. I'm willing to contribute, but I'm new to these kinds of things.

So far, I tried reusing the pin definitions of the ATmega328P (Nano v3) as I think the Nano Every can be used as a drop-in replacement. I might be wrong, though. In any case, I ran into a number of follow-up problems that I didn't have time to investigate yet.

[Mnjongen]

I have been trying some things (example: making it look like it's a nano) but still couldn't get it to work. I'll just have to wait for someone with a solution.

[focalintent]

I have a nano every on order and once it gets here I can start looking at getting it supported - I don’t think it is just going to be a new set of pin definitions.

[focalintent]

The ATMega4809 is different enough from the rest of the AVR based boards that FastLED supports that it will effectively be a full port (ARCH_ARDUINO_AVRMEGA vs. ARCH_ARDUINO_AVR). The pin work is done on a branch, but it can't make use of the existing avr asm code for things like the WS2812 output and such, there are enough differences already. I'm going to be re-writing the asm code for both avr and m0 already for the RGBW support - I'll roll in updating the asm for the ATmega4809 into that process, but probably not before then.

[jvcop]

@focalintent Thanks for the update!

Speaking of WS2812, would the WS2801 be supported as well?

[focalintent]

Yes, although not with hardware SPI - you can check out the branch here https://github.com/FastLED/FastLED/tree/avrmega -- but I won't merge it back into master until I have a solution for WS281x style chips working.

[hiduino]

Using the flat register names you could use the existing fastpin_avr.h class file for the port and pin definitions. I've use this to get the ATtiny series 0/1 and ATmega series 0 to work with DotStar LEDs.

if !defined(__AVR_ATtinyxy7__) && !defined(__AVR_ATtinyxy6__) && !defined(__AVR_ATtinyxy4__) && !defined(__AVR_ATtinyxy2__) && !defined(__AVR_ATmega4809__)

define _FL_IO(L,C) _RD8(DDR ## L); _RD8(PORT ## L); _RD8(PIN ## L); _FL_DEFINE_PORT3(L, C, _R(PORT ## L));

define _FL_DEFPIN(_PIN, BIT, L) template<> class FastPin<_PIN> : public _AVRPIN<_PIN, 1<

else

// Register name equivalent (using flat names) DDRA as PORTA_DIR, PORTA as PORTA_OUT, PINA as PORTA_IN

define _FL_IO(L,C) _RD8(PORT ## L ## _DIR); _RD8(PORT ## L ## _OUT); _RD8(PORT ## L ## _IN); _FL_DEFINE_PORT3(L, C, _R(PORT ## L ## _OUT));

define _FL_DEFPIN(_PIN, BIT, L) template<> class FastPin<_PIN> : public _AVRPIN<_PIN, 1<

endif

Yes, you will still need separate asm code changes for the WS2812 type LEDs.

[Rydogdav]

Any further progress on this? I'd really like to be able to use my WS2812Bs. Thanks!

[graysonmendenhall]

Has there been any more progress on this issue or should I just revert to using a regular Nano?

[kriegsman]

Not supported yet but we’re starting to collect relevant info over on https://github.com/FastLED/FastLED/issues/716
Would love to have help if you have some expertise with the ATmega4809 pin/port mappings, too