Minimal 64x4 SD card

[hans61]

After many attempts I now have working hardware for SD card support.
writing and reading sectors (CMD17, CMD24) works.
First results here, the next step should be a FAT32 library.

https://github.com/hans61/Minimal-64x4/tree/main/hardware/SD-Card

[TwoPigsToTheWind]

Wonderful, great work

[slu4coder]

Looks fantastic. I will definitely dive into this :-)

[hans61]

My current status:

https://github.com/hans61/Minimal-64x4/tree/main/hardware/expansion-compact

[TwoPigsToTheWind]

All of that on a 100mm by 100mm! That is surprisingly few ICs for all the added functions. Looks great.

[hellboy73]

I didn't even finish building my first Minimal64x4 but already excited to have such expansion board :)
Sound, joystick, SD card support, those are essential features to enable Minimal to wider user base. If we add power-on reset circuit here, like someone suggested and we have all-you-ever-need expansion card. :D

[hans61]

There is a new version. I will publish it in the next few days.
I tried some simple power on reset circuits. But they didn't work. I could use a small attiny or pic. But I don't think that would be suitable. If anyone has an idea for a simple circuit I would be happy. I only have a little space left on the board.

[hellboy73]

See here kipshere used ADM706AN for power on reset.