Master System controller support about nestang HOT 3 OPEN

I don't know the SMS joystick and the electrical properties of the signals, but I believe it should be possible. Bear in mind that it probably works with 5V and NESTang works with 3V3 signals, so you'd probably need a logic shifter for high frequency sampling or you'd probably do with resistor voltage dividers for sampling @60-120Hz.

My approach would be to create a new module with a clock divider from 27MHz to 60-120Hz, and just sample every pin at posedge of this clock divider, and just output that register. I think that should be enough.

I don't know how the light sensor works, so I'd just keep that disconnected

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I think this branch should do it: fjpolo/TangNano20k_SMSGamepap

Bitstream:
nes.zip

You'll get something like this if you place a scope:

And this would be the pinout:

EVK:

Can't test it myself since I don't own a SMS gamepad.

⚠Don't forget to convert your 5V logic to 3V3 logic!

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BTW @RyanMac84, NESTang parses controller as [Right Left Down Up Start Select B A] and this SMSGamepad module parses it as [0 0 Right Left Down Up B A]. Here's a new version that parses it as [Right Left Down Up 0 0 B A]:

NESTang_Nano20k_0v8_SMSGamepad_20231206.zip

I personally don't think it's gonna work that good, many NES games depend on Start and Select buttons, so idk how you'll gonna find a workaround for it

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