Nintendo Switch Online N64 Controller + 8bitdo Adapter = Wrong/Missing Button Mappings

[SubElement]

Hello,

I'm suing a USB64 (Latest build-202110290732) with the 8bitdo Adapter (Latest firmware, v2.02) with the Nintendo Switch Online N64 Controller. It mostly works okay, but some of the button mappings are incorrect. This is tested on an N64 with Controller Test Tool by sanni.

Here's what works correctly:

D-Pad (Up, Down, Left and Right)
Analogue Stick
Start Button
L Button
R Button

Important buttons that don't work work or have no mapping

B - Mapped as Z
A - Mapped as Z
C-Left - Mapped as B
C-Down - Mapped as A
C-Right - No Mapping
C-Up - No Mapping
Z-Trigger - No Mapping

Non-important buttons

ZR - No Mapping
Screenshot Button - No Mapping
Home Button - No Mapping

Is there anyway this can be corrected?

Please let me know if you need any more information or if I can help fix this in any way.

Thank you!

[Ryzee119]

Thanks for raising this usse.
It definitely can be corrected. Could you just try this build quickly? Its from https://github.com/Ryzee119/usb64/actions/runs/1769804523 and based on current master which has alot of changes from that release build. If the issue is still present we'll go from there

test-firmware-teensy41.zip
Disregard that. I tested it myself and its not working, Ill have to investigate a bit

[Ryzee119]

Are you able to compile the code yourself?

The mapping is here:

usb64/src/input.cpp

Lines 280 to 325 in c3dae9b

	case JoystickController::XBOX360_WIRED:
	//Digital usb_buttons
	//FIXME Modifier to make A,B,X,Y be C buttons
	if (_buttons & (1 << 0)) state->dButtons |= N64_DU; //DUP
	if (_buttons & (1 << 1)) state->dButtons |= N64_DD; //DDOWN
	if (_buttons & (1 << 2)) state->dButtons |= N64_DL; //DLEFT
	if (_buttons & (1 << 3)) state->dButtons |= N64_DR; //DRIGHT
	if (_buttons & (1 << 4)) state->dButtons |= N64_ST; //START
	if (_buttons & (1 << 5)) state->dButtons |= 0; //BACK
	if (_buttons & (1 << 6)) state->dButtons |= 0; //LS
	if (_buttons & (1 << 7)) state->dButtons |= 0; //RS
	if (_buttons & (1 << 8)) state->dButtons |= N64_LB; //LB
	if (_buttons & (1 << 9)) state->dButtons |= N64_RB; //RB
	if (_buttons & (1 << 10)) state->dButtons |= 0; //XBOX BUTTON
	if (_buttons & (1 << 11)) state->dButtons |= 0; //XBOX SYNC
	if (_buttons & (1 << 12)) state->dButtons |= N64_A; //A
	if (_buttons & (1 << 13)) state->dButtons |= N64_B; //B
	if (_buttons & (1 << 14)) state->dButtons |= N64_B; //X
	if (_buttons & (1 << 15)) state->dButtons |= 0; //Y
	if (_buttons & (1 << 7)) state->dButtons |= N64_CU | //RS triggers
	N64_CD | //all C usb_buttons
	N64_CL |
	N64_CR;
	//Analog stick (Normalise 0 to +/-100)
	state->x_axis = _axis[0] * 100 / 32768;
	state->y_axis = _axis[1] * 100 / 32768;
	//Z button
	if (_axis[4] > 10) state->dButtons |= N64_Z; //LT
	if (_axis[5] > 10) state->dButtons |= N64_Z; //RT
	//C usb_buttons
	if (_axis[2] > 16000) state->dButtons |= N64_CR;
	if (_axis[2] < -16000) state->dButtons |= N64_CL;
	if (_axis[3] > 16000) state->dButtons |= N64_CU;
	if (_axis[3] < -16000) state->dButtons |= N64_CD;
	//Button to hold for 'combos'
	if (combo_pressed)
	*combo_pressed = (_buttons & (1 << 5)); //back
	//Map right axis for dual stick mode
	right_axis[0] = _axis[2] * 100 / 32768;
	right_axis[1] = _axis[3] * 100 / 32768;
	break;

It might need a bit of trial and error to get it correct

[SubElement]

Uhh, I’ve never compiled code of any variety I’m sorry. 😅

I assume it wouldn’t be noob friendly to do?

[SubElement]

Okay here is an update. With the 8bitdo adapter plugged in to my PC, I can map the buttons are in relation to an Xbox 360 controller if that's helpful:

N64                        X-Box 360
-----------------------------------------
D-Pad Up                   D-Pad Up
D-Pad Down                 D-Pad Down
D-Pad Left                 D-Pad Left
D-Pad Right                D-Pad Right
Analogue Stick             Analogue Stick
Start Button               Start Button
L Button                   L Button
R Button                   R Button
B                          Left Trigger
A                          Right Trigger
C-Left                     X
C-Down                     A
C-Right                    B
C-Up                       Y
Z-Trigger                  Back

[Ryzee119]

That is helpful thanks. No wonder its being wacky... why tf did 8bitdo decide on that mapping 🤔

I should be able to have a look tomorrow (late here)

[SubElement]

Yeah, I have NFI why they chose that combination?

By the way I downloaded the code and visual studio to try and compile myself but I don't quite understand the code to button correlation... I tried! XD

Either way, I appreciate your help!

[Ryzee119]

I've added this conditional to the mapping based on your handy table. Please test and let me know how it goes!
usb64_8bitdo_n64fix.zip

The biggest problem is that this will replace the mapping for the 8bitdov2 adaptor for ALL controllers not just the n64 switch controller. The mapping does make some sense as I am looking at it more but not very intuitive if using other controllers now.
Im not sure it is possible to determine if the connected controller is a n64 switch controller or not through the 8bitdo adaptor. That will need investigating.

if (joy->idVendor() == 0x2dc8 && joy->idProduct() == 0x3106)
{
    if (_buttons & (1 << 0))  state->dButtons |= N64_DU;  //DUP
    if (_buttons & (1 << 1))  state->dButtons |= N64_DD;  //DDOWN
    if (_buttons & (1 << 2))  state->dButtons |= N64_DL;  //DLEFT
    if (_buttons & (1 << 3))  state->dButtons |= N64_DR;  //DRIGHT

    //Analog stick (Normalise 0 to +/-100)
    state->x_axis = _axis[0] * 100 / 32768;
    state->y_axis = _axis[1] * 100 / 32768;

    if (_buttons & (1 << 4))  state->dButtons |= N64_ST;  //START
    if (_buttons & (1 << 8))  state->dButtons |= N64_LB;  //LB
    if (_buttons & (1 << 9))  state->dButtons |= N64_RB;  //RB

    if (_buttons & (1 << 6))  state->dButtons |= N64_B;   //LS
    if (_buttons & (1 << 7))  state->dButtons |= N64_A;   //RS

    if (_axis[4] > 10) state->dButtons |= N64_B; //LT
    if (_axis[5] > 10) state->dButtons |= N64_A; //RT

    if (_buttons & (1 << 12)) state->dButtons |= N64_CD;  //A
    if (_buttons & (1 << 13)) state->dButtons |= N64_CR;  //B
    if (_buttons & (1 << 14)) state->dButtons |= N64_CL;  //X
    if (_buttons & (1 << 15)) state->dButtons |= N64_CU;  //Y

    if (_buttons & (1 << 5))  state->dButtons |= N64_Z;  //BACK
    break;
}

[SubElement]

Hey! Thanks, so I just tried this before leaving for work and it's weirdly made no difference at all? The buttons seem to be working as before.

Unsure whats going on, and pretty sure it's flashed correctly.

Thoughts?

Edit: Oh, as perhaps as a solution to the exclusive mapping. Maybe have an option in a menu, or a key combo to enable NSO N64 more or something? Unsure how complicated something like that would be?

[Ryzee119]

Can you confirm the device PID/VID? do they match joy->idVendor() == 0x2dc8 && joy->idProduct() == 0x3106)

[SubElement]

Hello! I plugged the 8bitdo Receiver into my MacBook Air to get a PID and VID in the same format as yours and they appear to be different.

PID = 0x028e
VID = 0x045e

[Ryzee119]

Try this one. My mistake, I thought you had the 8bitdo adaptor V2, but its V1 with V2 firmware :)

usb64_n64switch_fix.zip

[SubElement]

Try this one. My mistake, I thought you had the 8bitdo adaptor V2, but its V1 with V2 firmware :)

Haha, no worries, easy mistake to make.

I just have it a try and all buttons work as expected, thank you! I greatly appreciate it.

Now, is there any chance I could use this mapping while also having other controllers plugged in?

[Ryzee119]

Yea thanks for confirming the mapping. Ill add some kind of button combo to switch the layout as you suggested.

[SubElement]

Yea thanks for confirming the mapping. Ill add some kind of button combo to switch the layout as you suggested.

Legend, thanks!

Edit: Just a thought, it would have to be a button combo that is accessible to the limited buttons available before the fix.