36 lines
1 KiB
Markdown
36 lines
1 KiB
Markdown
# Pico SDR
|
|
|
|
Using RP2040 / Raspberry Pi Pico as a software-defined radio receiver.
|
|
|
|
See the [blog post](https://blog.porucha.net/2024/pico-sdr/) for more information. Older code the article is mostly referring to can be found in the branch `old`.
|
|
|
|
## Circuit
|
|
|
|
|
|
|
|
## Software
|
|
|
|
1. Clone using `git clone --recursive` as this package is using a custom USB
|
|
stdio library for better throughput and to avoid deadlocks.
|
|
|
|
2. Build and flash the firmware as usual:
|
|
|
|
```bash
|
|
export PICO_SDK_PATH=/path/to/pico-sdk
|
|
cmake -B build src
|
|
cmake --build build
|
|
picotool load -f build/pico_sdr.uf2
|
|
```
|
|
|
|
3. Start the USB serial to TCP bridge:
|
|
|
|
```bash
|
|
python util/bridge.py
|
|
```
|
|
|
|
You need to have PySerial and Click packages installed.
|
|
|
|
4. Open `grc/PicoSDR-WBFM.grc` in GNU Radio Companion, adjust carrier frequency to match your favorite FM radio station and press `F6`.
|
|
|
|
5. Alternatively [gqrx](https://www.gqrx.dk/) works fine with `rtl_tcp` input mode. Maximum sample rate seem to be 400 ksps, above that the samples are dropped.
|