ULX3S: use ESP32 - Githubissues

BrunoLevy / learn-fpga

Learning FPGA, yosys, nextpnr, and RISC-V

BSD 3-Clause "New" or "Revised" License

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ULX3S: use ESP32 #18

Closed BrunoLevy closed 2 years ago

BrunoLevy commented 3 years ago

For now, ESP32 is deactivated (to let the FPGA access the SDCard), would be good to have a way of toggling this, through a bit in a HW register, and a special command, so that we could flash over Wifi, and send programs to the SDCard over Wifi.

Nore: ESP32 can also be used to drive bluetooth peripherals ! https://github.com/dan-rodrigues/ulx3s-bluetooth-gamepad

BrunoLevy commented 2 years ago

Implemented in LiteX:

added CSR to switch ESP32 on/off
added three-state logic to the SDCard pins https://github.com/BrunoLevy/learn-fpga/tree/master/FemtoRV/FIRMWARE/LiteX