RPi_Pico_WAV_Player is Hi-Res WAV player for Raspberry Pi Pico.
This project features:
- Playback up to Hi-Res WAV format
- Channel: Mono, Stereo
- Bit resolution: 16bit, 24bit
- Sampling frequency: 44.1KHz, 48KHz, 88.2KHz, 96KHz, 176.4KHz, 192KHz
- SD Card interface (exFAT supported)
- 160x80 LCD display
- UI Control by 3 Push buttons or Headphone Remote Control buttons
- Display Tag information by ID3v2 tag (RIFF ID3v2), otherwise by LIST chunk in WAV file
- Display Coverart image from JPEG bitstream in ID3v2 tag, otherwise from JPEG file in the folder
- Volume Control Function by fully utilizing 32bit DAC range
- Raspberry Pi Pico board
- or Waveshare RP2040-LCD-0.96 board
- ST7735S 0.96" 160x80 LCD (for Raspberry Pi Pico board only)
- PCM5102 32bit I2S Audio DAC
| Pico Pin # | GPIO | Function | Connection |
|---|---|---|---|
| 21 | GP16 | BCK | to PCM5102 BCK (13) |
| 22 | GP17 | LRCK | to PCM5102 LRCK (15) |
| 23 | GND | GND | GND |
| 24 | GP18 | SDO | to PCM5102 DIN (14) |
| 32 | GP27 | AUDIO_DAC_ENABLE | to PCM5102 XSMT (17) |
| 36 / 40 | 3V3(OUT) / VBUS | VCC | to VIN of PCM5102 board |
From DAC noise's point of view, it is recommended to provide the power of PCM5102 from VBUS (5V). For battery operation, use 3V3(OUT) pin as described in schematic.
- tie PCM5102 SCK (12) to low (bridge short land)
- H1L (FLT) = L
- H2L (DEMP) = L
- H3L (XSMT): Remove the bridge to H and connect GP27
- H4L (FMT) = L
| Pico Pin # | GPIO | Function | Connection |
|---|---|---|---|
| 12 | GP9 | GPIO | BLK |
| 14 | GP10 | SPI1_SCK | SCL |
| 15 | GP11 | SPI1_TX | SDA |
| 17 | GP13 | SPI1_CSn | CS |
| 18 | GND | GND | GND |
| 19 | GP14 | GPIO | DC |
| 20 | GP15 | GPIO | RES |
| 36 | 3V3(OUT) | 3.3V | VCC |
- Raspberry Pi Pico board only
| Pico Pin # | GPIO | Function | Connection |
|---|---|---|---|
| 4 | GP2 | SPI0_SCK | CLK (5) |
| 5 | GP3 | SPI0_TX | CMD (3) |
| 6 | GP4 | SPI0_RX | DAT0 (7) |
| 7 | GP5 | SPI0_CSn | CD/DAT3 (2) |
| 8 | GND | GND | VSS (6) |
| 36 | 3V3(OUT) | 3.3V | VDD (4) |
- Wire length between Pico and SD card is very sensitive. Short wiring as possible is desired, otherwise access errors will occur.
Either of GPIO Push Buttons or Headphone Remote Control Buttons need to be implemented at least.
| Pico Pin # | GPIO | Function | Connection |
|---|---|---|---|
| 26 | GP20 | GPIO | Push Button (Minus) |
| 27 | GP21 | GPIO | Conditional Pullup for Buttons |
| 29 | GP22 | GPIO | Push Button (Plus) |
| 31 | GP26 | ADC0 | Headphone Remote Control (MIC pin) and/or Push Button (Center) |
- 2.2Kohm pullup resister is mandatory for both cases.
For complete portable player with Li-Po battery operation, refer to the following schematics which describe additional power control circuit.
RPi_Pico_WAV_Player_schematic.pdf
RPi_Pico_WAV_Player_Waveshare-RP2040-LCD096_schematic.pdf
- 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/RPi_Pico_WAV_Player.git
> cd RPi_Pico_WAV_Player
> git submodule update -i
> cd ..
- 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 RPi_Pico_WAV_Player
> mkdir build && cd build
> cmake -G "NMake Makefiles" ..
> nmake
- Put "RPi_Pico_WAV_Player.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 RPi_Pico_WAV_Player
$ mkdir build && cd build
$ cmake ..
$ make -j4
- Download "RPi_Pico_WAV_Player.uf2" on RPI-RP2 drive
UI Control is available with GPIO 3 push switches or 3 button Headphone Remote Control. For Headphone Remote Control, Connect MIC pin to GP26 of Raspberry Pi Pico. GP26 also needs to be pulled-up by 2.2Kohm from GP21. See schematic for detail.
- Plus/Minus button to go up/down for file selection
- Center 1 click to get into the folder
- Center 1 click to play WAV file (go to Play Mode)
- Center 2 clicks to go parent folder
- Center 3 clicks to Random album play (go to Play Mode)
- Long push Center button to go to Config Mode
- 1 min passed without any button after play finished: Sequential/SequentialRepeat/Repeat/Random album play (go to Play Mode)
- Plus/Minus button for volume up/down
- Center 1 click to pause/play
- Center 2 clicks to stop (go back to FileView Mode)
- Center 3 clicks to Random album play
- Long push Center button to go to Config Mode
- Plus/Minus button to go up/down to select config items
- Center 1 click to determine config values
- Center 2 clicks to go back to previous Mode (FileView or Play)
- Long push to Power Off (Optional: additional circuit needed)
- Long push Center button or any buttons of Headphone Remote Control
- Put "logo.jpg" on root Folder of SD Card
- File Format: JPEG format (Progressive JPEG not supported)
- logo.jpg example
- Put JPEG bitstream in ID3v2 tag of WAV file
- Otherwise, put JPEG file on same folder where WAV files are located
- JPEG format: Progressive JPEG not supported
- See ConfigMenu for the detail of Config Menu items
- ST7735S 0.96" 160x80 LCD could require different configuration for its position offset, rotation, mirror and color order. It is hard to distinguish which type of configuration is needed from the module outlook.
- Suitable configuration out of 3 types(1, 2, 3) can be selected from Display -> LCD Config menu from Config Mode.
- The volume function applies the scale factor less than x1.0 to 32bit normalized sampling data / channel, which is sent to 32bit audio DAC.
- To preserve the original linearity with the best quality of the audio DAC, playing with volume
100is desirable. - For 16bit WAV, the number of resolution steps will be maintained theoritically at any volume values except for
0. - For 24bit WAV, the number of resolution steps will be spoiled if applying the volume less than
34. - For 32bit (int) WAV, the number of resolution steps will be spoiled if applying the volume less than
100.
- The read speed stability is needed for playing Hi-Res WAV such as 24bit 192.0 KHz. In this project, the read operation is done by single bit SPI interface, which gives more severe limiation to the actual read speed perfomance compared to the nominal performance of the card.
- In case of lack of card reading speed for playing, instant mute will be inserted while playing and the warning message will be displayed on serial terminal.
- The read speed stability in this project is not always propotional to the maximum performance of the card, therefore, it is worth trying other grade/vendor's card if facing at read speed stability problem.
- Format micorSD card in exFAT with official SD Card Formatter before usage.
- Following table is, just for reference, recommend of microSD cards. Comments are about the buffer margin for playing under the condition with more than half of the card storage capacity used. (It could get worse if near-full storage capacity is used.)
| # | Vendor | Product Name | Part Number | Comment |
|---|---|---|---|---|
| 1 | Samsung | PRO Plus 256GB | MB-MD256SA | Pretty fine with 24bit 192KHz playing |
| 1 | Kioxia | Exceria G2 256GB | LMEX2L256GG2 | Pretty fine with 24bit 192KHz playing |
| 3 | SanDisk | Extreme PRO 256GB | SDSQXCD-256G-GN6MA | Fine with 24bit 192KHz playing |
| 4 | SanDisk | Ultra 256GB | SDSQUAC-256G-GN6MN | Pretty fine with 24bit 96KHz playing |
- In case of card mount error or fundamental access errors, please confirm with FatFs test lib/pico_fatfs/test.
- In addition to existing contents, Hi-Res WAV contents can be generated by pico_spdif_recorder.