Python class encapsulating si4702/si4703 fm receiver chip on R-Pi running blinka (circuitpython-like).
si470x.py implements class SI4703 which handles the initialization and communication with an SI4702/4703 connected over the default I2C bus (board.I2C()). The SI470x RST line must also be connected to a GPIO, this is on board.D23 by default, but can be overridden with an initialization argument.
rotary_encoder.py contains a class wrapping the Adafruit Stemma QT Rotary Encoder
radio.py is a minimal program that boots an SI4703, tunes it to 93.9 MHz (WNYC!), and allows the volume to be controlled by a rotary encoder.
This works with the Sparkfun FM Tuner Basic Breakout, where the analog output(s) are connected to an audio amp (e.g. this) to make the actual radio sound.
RDS support (which is perhaps the main attraction of the SI4703) will be added at a later date.