https://github.com/elehobica/pico_spdif_rx
S/PDIF receiver library for Raspberry Pi Pico series
https://github.com/elehobica/pico_spdif_rx
raspberry-pi-pico raspberry-pi-pico-2 rp2040 rp2350 spdif toslink
Last synced: 2 months ago
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S/PDIF receiver library for Raspberry Pi Pico series
- Host: GitHub
- URL: https://github.com/elehobica/pico_spdif_rx
- Owner: elehobica
- License: bsd-2-clause
- Created: 2023-01-21T00:43:08.000Z (over 2 years ago)
- Default Branch: main
- Last Pushed: 2025-05-14T13:02:01.000Z (5 months ago)
- Last Synced: 2025-05-20T00:06:32.173Z (5 months ago)
- Topics: raspberry-pi-pico, raspberry-pi-pico-2, rp2040, rp2350, spdif, toslink
- Language: C
- Homepage:
- Size: 1.1 MB
- Stars: 87
- Watchers: 4
- Forks: 12
- Open Issues: 2
-
Metadata Files:
- Readme: README.md
- Changelog: CHANGELOG.md
- License: LICENSE.txt
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README
# S/PDIF receiver library for Raspberry Pi Pico series
[](https://github.com/elehobica/pico_spdif_rx/actions/workflows/build-binaries.yml)
## Overview
* S/PDIF receiver with sampling frequency detection by PIO function
* Supported format:
* Channels: 2 (Stereo)
* Bit resolution: 16bit and 24bit
* Supported sampling frequencies:
* 44.1 KHz, 48.0 KHz, 88.2 KHz, 96.0 KHz, 176.4 KHz and 192.0 KHz for Raspberry Pi Pico (rp2040)
* 44.1 KHz, 48.0 KHz, 88.2 KHz and 96.0 KHz for Raspberry Pi Pico 2 (rp2350)
## Supported Board and Peripheral Devices
* Raspberry Pi Pico (rp2040)
* Raspberry Pi Pico 2 (rp2350)
* S/PDIF Coaxial or TOSLINK Rx module (DLR1160 or equivalent)
## Pin Assignment & Connection
### S/PDIF Rx
| 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.
## How to build
* See ["Getting started with Raspberry Pi Pico"](https://datasheets.raspberrypi.org/pico/getting-started-with-pico.pdf)
* 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 2.1.1
```
> git clone -b 2.1.1 https://github.com/raspberrypi/pico-sdk.git
> cd pico-sdk
> git submodule update -i
> cd ..
> git clone -b sdk-2.1.1 https://github.com/raspberrypi/pico-examples.git
>
> git clone -b sdk-2.1.1 https://github.com/raspberrypi/pico-extras.git
>
> git clone -b main https://github.com/elehobica/pico_spdif_rx.git
```
### Windows
* 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" .. ; (for Raspberry Pi Pico 1 series)
> cmake -G "NMake Makefiles" -DPICO_PLATFORM=rp2350 -DPICO_BOARD=pico2 .. ; (for Raspberry Pi Pico 2)
> nmake
```
* Put "*.uf2" on RPI-RP2 or RP2350 drive
### Linux
* Build is confirmed with [pico-sdk-dev-docker:sdk-2.1.1-1.0.0]( https://hub.docker.com/r/elehobica/pico-sdk-dev-docker)
* 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 .. # (for Raspberry Pi Pico 1 series)
$ cmake -DPICO_PLATFORM=rp2350 -DPICO_BOARD=pico2 .. # (for Raspberry Pi Pico 2)
$ make -j4
```
* Download "*.uf2" on RPI-RP2 or RP2350 drive
## Decode output format
* 32bit output for each S/PDIF sub frame including header, audio data, AUX, VUCP
* see comments in [spdif_rx.pio](spdif_rx.pio) for further detail
## Sample projects
### detect_samp_freq
* display sampling frequency, C bits of S/PDIF frame and number of parity errors while decoding
### spdif_to_i2s_32b
* convert S/PDIF input to I2S 32bit output
## For more detail about internal code structure
* See [DeepWiki](https://deepwiki.com/elehobica/pico_spdif_rx) (powered by [Devin](https://app.devin.ai/invite/WFPByHrQP7TwsUuq))
## Application Examples
* [pico_spdif_recorder](https://github.com/elehobica/pico_spdif_recorder)
* [pico_spdif_dac_hpamp](https://github.com/elehobica/pico_spdif_dac_hpamp)