OrangeCrab Litex ADC

This repository contains the firmware and gateware for the OrangeCrab to enable testing of the OrangeCrab ADC in a simple SDR application.

Gateware is done in Litex and Verilog and the firmware is C.

Hardware

• OrangeCrab: OrangeCrab Repo
• OrangeCrab ADC: orangecrab_adc

Usage

Current status: in developement - basic SDR operations working

To create the bitstream for the OrangeCrab run the following, use --update-firmware flag when updating changes in firmware only.

cd hw
python3 OrangeCrab-bitstream.py [--update-firmware]

To load the bitstream

dfu-util -D build/orangecrab/gateware/orangecrab.dfu

To operate, connect a terminal application to the USB CDC ACM device

gtkterm -p /dev/ttyACM0

This will run a few simple tests and start the command software which presents a "litex>" prompt. Type "help" to see what commands are available.

Currently the supported operations for the SDR core are:

• sdr_set_demod - Set SDR Demod Type
• sdr_set_rate - Set SDR Sample Rate
• sdr_set_cicgain - Set SDR CIC Gain
• sdr_set_noiseshape - Set LO Noise shaping
• sdr_set_freq - Set SDR LO Frequency
• sdr_status - Get SDR settings & status