Regarding 8bitdo SN-30's switch mode, setting the player led is not working as intended...

[Nathan Ramanathan]

Hi Ricardo!

I wanted to play around with my 8bitdo's player LEDs in Switch mode, but the function that sets the 4 LEDs is not working.  Every number sets the player to player 1.  

Is there a way to set it like a Wiimote? For instance, I want to light up only player 2's led or only player 3's led.

                 Intended        Reality

Player 2:   0 0 1 0          0 0 0 1

Player 3:   0 1 0 0          0 0 0 1

Thanks,

- Nathan Ramanathan

[Ricardo Quesada]

Hi,

I couldn't find a way to do it.
AFAIK, the 8bitdo firmware is only compatible with the buttons, but
rumble and LEDs are not working as expected.
I filed a bug a while ago (I sent them an email), but their response
was kind of "thanks..." and they didn't give a ticket number or
anything like that.

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[Nathan Ramanathan]

Do the official Nintendo joycons/pro controllers work with setting the LEDs, or is this just 8bitdo' issue?

[Ricardo Quesada]

I haven't tested it with the joycon, but Nintendo Switch Pro LEDs
works Ok with the unijoysticle.

On Mon, Apr 27, 2020 at 2:36 PM Nathan Ramanathan
<nathan6r...@gmail.com> wrote:
>
> Do the official Nintendo joycons/pro controllers work with setting the LEDs, or is this just 8bitdo' issue?
>

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[Nathan Ramanathan]

I'll share what I have so far, but NOTE I can't seem to repeat my experiments again for some reason; my 8bitdo is always setting everything to player 1's LED, I might have changed some parts of my code, but I was indeed able to set the LEDs individually at some point of my testing:

Anyways,

I looked at a pending patch of the Linux kernel and found this piece of code for the joycon's LED

I modified your led script from 

req->data[0] = d->joystick_port;

to

req->data[0] = (0 << 4) | (0xF >> (4-4));

this seems to set the player LEDs as follows(where `+` is the LED being on, and `-` is the LED turned off)

+ - - -

(which is player 1)

and if I change the code to: 

req->data[0] = (0 << 4) | (0xF >> (4-0));

I get

+ + + +

(which is player 4)

and if I did:

req->data[0] = (0 << 4) | 0x7;

I got:

+ + - -

(which is player 2 in Nintendo's way)

I was never able to set the other LEDs though.  So, maybe there's something wrong with our payload structure?  I think I played with the payload too much, that I can't repeat my experiments...

[Ricardo Quesada]

Thanks.
Just to understand, at some point you were able to change the 8bitdo
LEDs? is that correct?

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[Nathan Ramanathan]

Yes, that is correct. 

[Ricardo Quesada]

ok. thanks. I'll double check my code. thanks for the tip.

On Mon, Apr 27, 2020 at 4:57 PM Nathan Ramanathan

[ricardo...@gmail.com]

Finally I had time to test it, and what unijoysticle is doing is correct:

MSB: flash LEDs

LSB: just turn them On.

Original Switch: it ignores the flash (perhaps I'm on an old switch firmware?)

8bitdo: doesn't work, regardless of the combination

some clones: work Ok with flash (but flash is not used in unijosyticle)