October 17th, 2012, 02:36 Posted By: wraggster
We’ve seen NES, SNES, Sega, and just about every weird controller Atari put out connected to microcontrollers, but connecting the N64 controller to a project has remained one of those seldom-seen, rarely copied endeavors, not often tackled by makers around the globe. [Pieter-Jan] decided to throw his hat in the ring and givereading an N64 controller with a PIC a try, and we’re pleased to report he’s been completely successful.
One of the difficulties of reading an N64 controller is simply the speeds involved; with only three pins on the controller port, the N64 controller uses a serial protocol to send 32 bits of controller data at a fairly fast rate. Armed with a PIC18F ‘micro, [Pieter] realized that programming in C would be too slow, he needed to go all the way down to the bare metal and program his micro in assembly.
Every time the N64 controller data needs to be read, the console sends out a 9-bit polling request. The controller responds in turn with a 32-bit sequence informing the console of the status of all the buttons and joysticks. Once [Pieter] got his micro sending the correct polling response, it was only an issue of parsing the data returned from the controller.
Right now, [Pieter] has a small demo board rigged up that flashes a LED whenever the A, B, or Z buttons are pressed. This can be expanded to the remaining buttons and joystick, but for now we’ll just enjoy [Pieter]‘s demo after the break.
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