- S/PDIF receiver by rp2040 PIO function
- format: 2ch, 16bit or 24bit
- sampling frequency: 44.1 KHz, 48.0 KHz, 88.2 KHz, 96.0 KHz, 176.4 KHz, 192.0 KHz
- signal detecting function for all supported sampling frequencies
- Raspberry Pi Pico (rp2040)
- S/PDIF Coaxial or TOSLINK Rx module (DLR1160 or equivalent)
Pico Pin # | GPIO | Function | Connection |
---|---|---|---|
20 | GP15 | DATA | from S/PDIF data |
Notes:
- 74HC04 should be genuine device, otherwise (counterfeit device) it could not work at higher sampling frequencies.
- if TOSLINK only, direct connection from module output to GP15 will work as well.
- See "Getting started with Raspberry Pi Pico"
- Put "pico-sdk", "pico-examples" and "pico-extras" on the same level with this project folder.
- Set environmental variables for PICO_SDK_PATH, PICO_EXTRAS_PATH and PICO_EXAMPLES_PATH
- Confirmed with Pico SDK 2.0.0
> git clone -b 2.0.0 https://github.com/raspberrypi/pico-sdk.git
> cd pico-sdk
> git submodule update -i
> cd ..
> git clone -b sdk-2.0.0 https://github.com/raspberrypi/pico-examples.git
>
> git clone -b sdk-2.0.0 https://github.com/raspberrypi/pico-extras.git
>
> git clone -b main https://github.com/elehobica/pico_spdif_rx.git
- Build is confirmed with Developer Command Prompt for VS 2022 and Visual Studio Code on Windows environment
- Confirmed with cmake-3.27.2-windows-x86_64 and gcc-arm-none-eabi-10.3-2021.10-win32
- Lanuch "Developer Command Prompt for VS 2022"
> cd pico_spdif_rx\samples\xxxxx # sample project directory
> mkdir build && cd build
> cmake -G "NMake Makefiles" ..
> nmake
- Put "xxxxx.uf2" on RPI-RP2 drive
- Build is confirmed with pico-sdk-dev-docker:sdk-2.0.0-1.0.0
- Confirmed with cmake-3.22.1 and arm-none-eabi-gcc (15:10.3-2021.07-4) 10.3.1
$ cd pico_spdif_rx/samples/xxxxx # sample project directory
$ mkdir build && cd build
$ cmake ..
$ make -j4
- Download "xxxxx.uf2" on RPI-RP2 drive
- 32bit output for each S/PDIF sub frame including header, audio data, AUX, VUCP
- see comments in spdif_rx.pio for further detail
- display sampling frequency, C bits of S/PDIF frame and number of parity errors while decoding
- convert S/PDIF input to I2S 32bit output