[Help][Discussion][Save WRAM] Write file to SD card

[fjpolo]

Hey peeps, I'm opening this space to discuss about how we'd liike to implement saves in NESTang. I want this to be my next step.

So, my first idea was to implement saving WROM for MMC1 mapper, that means saving volatile WRAM space $6000-$7FFF to non-volatile memory (SD-Card unless there's another option) when saving (NESTang RAM -> SD-Card) and loding from non-volatile memory to RAM when dumping the ROM file (I'd say waiting for $6000-$7FFF and dumping from SD-Card save file instead of ROM file).

The thing is, Ive never done anything similar so far in Verilog, so I have no idea where to start or look at when we talk about reading/writing files from/to SD-Card and that's where I'd like to ask for some guidance.

All other stuff for the module I've got a pretty good idea on how to do it, but this part is just making me anxious 😂 Let me know what you'd do

Some links:
NESDev - Implementing a Save feature
MMC1 Mapper
NES_Mister - PR - Asdd save file support
SDcard controller MIT
ZipCPU SDcard controller

[nand2mario]

Looking forward to this. One thing is the current sd card controller is read-only. We need to find a read-write controller.

[fjpolo]

@nand2mario do you think this module could work?

[fjpolo]

Will eventually be integrated with softcore + fatfs