One thing I'm wondering is how the SNES implemented its Multitap support[1] with such a simple "wire protocol". Could it be that the two missing wires and/or 4 unused slots in the polling cycle are used for some kind of adressing scheme when a multitap is plugged in?
Building a USB SNES Controller
41–50 of 101 posts
Re: Building a USB SNES Controller
#42Of course completely awesome to make a modification like this. However, if you yourself want a USB SNES controller, consider buying one instead. 8BitDo offers them with the SN 30 Pro - the quality is good, they work with the Nintendo Switch or PC (including Linux), they have the additional buttons needed for modern games, there is a wired and a wireless version and the newer variant has afaik a replaceable battery (u…
Re: Building a USB SNES Controller
#43Re: Building a USB SNES Controller
#44Earlier quoted context omitted.
Completely agree. I even had that situation myself - I misremembered how the mode switch/bluetooth pairing mode worked and was not able to connect my controller to a switch, thinking it was broken, until I realized what had happened. A small toggle switch really would be much easier. Still think it's worth it, also to not destroy an original one. On the other hand, better to modify it like this than to throw it away…
The new version does actually use a switch instead of the magic button combination. Agreed on the previous version being annoying. Had many kid debugging sessions when they accidentally switched the mode and “broke” it.
Re: Building a USB SNES Controller
#45Re: Building a USB SNES Controller
#46Of course completely awesome to make a modification like this. However, if you yourself want a USB SNES controller, consider buying one instead. 8BitDo offers them with the SN 30 Pro - the quality is good, they work with the Nintendo Switch or PC (including Linux), they have the additional buttons needed for modern games, there is a wired and a wireless version and the newer variant has afaik a replaceable battery (u…
Re: Building a USB SNES Controller
#47Looking at the described protocol it seems the SNES controller uses a simple 16-bit parallel-in-serial-out shift register - and a quick Google confirmed that. This means the timing is almost certainly quite loose, and there's a pretty decent chance you might even be able to poll it as the 1kHz "needed" for "serious" gaming. And it'd be pretty trivial to offload the readout to the MCU's SPI peripheral.
Re: Building a USB SNES Controller
#48Looking at the described protocol it seems the SNES controller uses a simple 16-bit parallel-in-serial-out shift register - and a quick Google confirmed that. This means the timing is almost certainly quite loose, and there's a pretty decent chance you might even be able to poll it as the 1kHz "needed" for "serious" gaming. And it'd be pretty trivial to offload the readout to the MCU's SPI peripheral.
It's extremely loose! Using a custom PCB to connect the controller over RJ45 to a custom Pi hat I wrote some code to simply display the button presses on screen, to test the functionality of the controller (we are modifying hundreds). I had to play around a lot with the timings to match up the response of the program with the speed of my finger pushing a button, else the program would return "you pushed B" a dozen ti…
Re: Building a USB SNES Controller
#49Of course completely awesome to make a modification like this. However, if you yourself want a USB SNES controller, consider buying one instead. 8BitDo offers them with the SN 30 Pro - the quality is good, they work with the Nintendo Switch or PC (including Linux), they have the additional buttons needed for modern games, there is a wired and a wireless version and the newer variant has afaik a replaceable battery (u…