Software

For information on how to install and use this software, see the Getting Started page.

Library

libfreesrp is a C++ library for programming, controlling and getting data from the FreeSRP. It can be used to write applications that interface with the FreeSRP.

GNURadio compatibility

To use the FreeSRP as a general-purpose SDR transceiver, you can install GNURadio. The FreeSRP is compatible with GNURadio through a fork of gr-osmosdr (original project page, my fork), which also allows it to be used with Gqrx and many other GNURadio-based programs.

Firmware and FPGA design

Coming soon!

Hardware

The FreeSRP is a single 10x7cm PCB with an RF frontend, an FPGA for processing and a USB 3.0 interface.

RF frontend

The frontend is based on the Analog Devices AD9364 RF transceiver. Its main features are:

Frequency coverage from 70 MHz to 6 GHz
50 MHz bandwidth
12-bit DACs and ADCs
Frequency and time division duplex

FPGA

A Xilinx Artix 7 XC7A50T FPGA is connected to the parallel CMOS interface of the AD9364 and the GPIF II interface the USB 3.0 microcontroller provides.

It is used for real-time signal processing. Configuration happens through the USB microcontroller, which loads the bitstream onto the flash memory the FPGA uses. A JTAG debugging interface is provided as well.

USB interface

For USB 3.0 connectivity and system control the Cypress EZ-USB FX3 CYUSB3014 microcontroller is used.

General Information

Contents

The FreeSRP SDR is a work in progress!