PS2 compatibility changes - WIP

dangiu / PicoMemcard

Emulating PSX Memory Card (or controller) using a Raspberry Pi Pico

GNU General Public License v3.0

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PS2 compatibility changes - WIP #7

Closed darrena092 closed 2 years ago

darrena092 commented 2 years ago

This fixes a few issues I've found:

Acknowledging fast SPI clocks on PS2 meant for other peripherals, due to the speed of the pico. The PIO programs run slower now.
Random ACKs. This was due to how the ACK signal was triggered. It now won't trigger unless it counts 8 clocks.
Transaction restarts. Fixed this by re-structuring the memory card simulator to work as a state machine.

I do have one problem that I've yet to solve though, which is why this is still in draft. Occasionally both the PS1 and PS2 seem to think that the card has been disconnected.

darrena092 commented 2 years ago

Relates to: #2

darrena092 commented 2 years ago

That's the things you mentioned fixed, about to do more testing. On the ID command, interestingly enough the PS2 does use it. And not implementing it makes the PS2 think that a pocketstation is connected!

darrena092 commented 2 years ago

Still not ready to go yet. Fixing those issues you highlighted solved the weirdness around writes, but there's still an issue with syncing. With that in_transaction flag, it seems to just never sync, with removing it, it'll go into a sync right in the middle of transaction. More work needed, but I think that's me done for today!

darrena092 commented 2 years ago

Closing this, going to take a different approach