Embedded & hardware
RomEMU
SPI flash & I2C EEPROM emulator with a real-time web UI.
Turns an ESP32-S3 or ESP32-P4 into a drop-in replacement for common SPI flash and I2C EEPROM chips. Upload images over WiFi or Ethernet, switch slots instantly, and the target boots from PSRAM — no chip flashing required.
Specifications
- SPI flash: W25Q16…W25Q512 + Macronix MX25L (correct JEDEC + SFDP + 4-byte addr)
- I2C EEPROM: 24C02…24C512 with per-datasheet page wrap
- 4 ROM slots in PSRAM, instant switching
- HTMX dashboard with live SSE access log
- REST API, target reset / power MOSFET control
- WiFi STA + AP fallback, mDNS at romemu.local
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