Chromatix

The Chromatic’s ESP32 as an SDR: ESP-SDR on the radio side, the FPGA and a RISC-V on the console side, and a USB link to SoapySDR. How the samples move, how the tuning was pushed from the Wi-Fi channels to 1775-2890 MHz, the decoding tools running on the softcore, and what the result can and cannot do.

Doom on the ModRetro Chromatic with a VexRiscv in the GW5A-25 and 7.5 MB of PSRAM as main RAM: how the LiteX design made the port quick, and the measured ladder of gateware, compiler and renderer changes that took it from 6.4 to 31 fps.