doom_riscv/projects/riscv_usb/README.md

RISC-V + USB core demo

For the icebreaker, the hardware connections are :

• P1B4: USB DP
• P1B3: USB DN
• P1B2: Pull up. Resistor of 1.5 kOhm to USB DP

To run :

• Build and flash the bitstream

  • This will build fw/boot.hex and include it as the BRAM initial data

• Flash the main application code in SPI at offset 1M

  • make -C fw prog

• Connect to the iCEBreaker uart console (ttyUSB1) with a 1M baudrate

  • and then at the Command> prompt, press c for 'connect'. This will start the USB detection and device should enumerate