Intended primarily for the Malkeve Game Boy-compatible Flipper Zero add-on.
- v2.3 - Compatible (untested) - ✅
- v2.5 - Compatible (tested!) - ✅
v2.5.1- Revision note states change in EXT pins but doesn't give detail on changes. - ❓v2.6- Logic voltage level-shifter added for GB/GBC usage (3.3V -> 5V), but 5V potentially unsafe for GBA in GBA mode. - ❌
| ESP GPIO | GBA | Required | Notes |
|---|---|---|---|
| GPIO 2 | SO | Yes | SPI MISO (Master-In, Slave-Out) |
| GPIO 5 | SI | Yes | SPI MOSI (Master-Out, Slave-In) |
| GPIO 7 | SD | No | |
| GPIO 1 | SCLK | Yes | SPI CLK 1kΩ resistor in series prevents GBA parasitic power draw. |
| GND | GND | Yes |
- Unsure, while I could include support for more/better silicon like the ESP32-S3, I'm focused on keeping things as simple and cheap as possible.
- The only reason this firmware exists is for the already-existing Malkeve Flipper Zero add-on (well, at least the compatible versions), otherwise I'd have focused entirely on the Raspi Pico.