Reading real cartridges (Update - IT LIVES! - video)

[Pap]

that is really the least you should worry about now:)

[YaYa]

Instead of focusing on a through hole version, you should first focus on getting a good camera with better focusing capacities

(just kidding, please do not take it wrong, i like joking and tackling) lol

[Apis]

Was SPI faster?

[144TECH]

What about a I2C / Gpio expander for DPI aswell, (i wanted it too for pi2vga in combination with a safeshutdown)
Hope that DMG1 stuff i've sent you was usefull.
Thank you, Greets.

[Hex]

@abrugsh SPI needs 6 pins in its minimal form, 2xpower and MOSI,D/C,CLK,reset. SPI does not use up the i2c pins.

If you need the GPIO for communication then SPI or composite are your only choices.

[tinkerBOY]

This is awesome! Im following.

I've always wanted to do a similar project like this https://www.tindie.com/products/JRodrig ... r-gameboy/ which makes it easier to save roms and save files.

[abrugsch]

ok guys this has been on hold for a while thanks to several things (mainly the amount of sleep my little one allows me...)

There's a RGB565 mode that frees up SPI without the Chip Select pin AFAIK it's JUST doable as long as I don't need any other devices on the SPI bus. (I can use more than one MCP23S17 since it has it's own addressing mode using the same CS line. as long as the CS lines on the MCP's are held low then they will be selected and active.)

@144Tech I2C/SPI is too slow for DPI.
Sorry, I forgot to look at the stuff you sent. where did you send it? (Email/PM/Discord ?) Yeah. I'm terrible. I've barely even been on the forum for a couple of months! - usually on discord though

Just thought actually, the shift registers are input only, so it wouldn't actually work as intended as i think you have to do writes to set the registers in cart for which banks to read? ignore me, just spouting random things!

yep exactly! original designs for a reader only used shift registers on arduino, and was where i started out. but since I need Bi-Di (especially if I want to extend to GBA) then full port expanders is the only way to go. however it may well be that to get the speed i want, MCU's are looking increasingly likely the way to go. (that is what BennVenn does afterall...)

[abrugsch]

Bit banging SPI in C level code (wiringPi) is actually very fast. I've seen benchmarks of 10-20MHz output. Way faster than hardware I2C! The GPIO Soft SPI would be CPU intensive, but it only needs to happen at the start when not playing so that should be fine?

this is true... I didn't realise bit banging SPI was quick. I'll have to experiment a bit in that case, though wiring pi didn't seem to be setup well for transferring whole bytes of data, more individual pins. I'll definitely check it out once i've got to the bottom of the strange behavior I was seeing. (may have been device specific, i.e. borked)

[mattmikemo]

Just discovered this thread. Awesome work. This will be my dream Gameboy once this project is ready. Actually tearing up a little Thank You!

[abrugsch]

Just to let you know, the project isn't dead... Just had other IRL priorities lately but I'm definitely going to be finishing this as soon as i can