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Placa de som digital I2S

Primeiramente gostaria de salientar que não sou o autor principal do conteúdo deste artigo. A minha intenção é de mostrar o que outros autores tem realizado (referenciando links para o conteúdo original) neste blog até como um guia pessoal para uso próprio e ainda compartilhar minhas anotações e pequenas modificações que realizo no conteúdo, desejando que possa ajudar mais alguém em algum lugar.
First and foremost, I take no credit for any of this post’s content. I am really just taking what others have done (which I have links to bellow) and am putting it on my blog for a personal reference and hopefully the small changes that I made to their guides will help someone somewhere.

add lines at BOOT/config.txt

#PiFi DiGi+

for debuging add: dtoverlay=lirc-rpi,gpio_in_pin=26,debug=on


HiFiBerry DAC+, Digi+ and Amp+

GPIO2-3 (pins 3 and 5) are used by our products for configuration. If you are experienced with I2C, you might add other slave devices. If you a a novice, we don’t recommend this at all.
GPIOs 18-21 (pins 12, 35, 38 and 40) are used for the sound interface. You can’t use them for any other purpose.

On the HiFiBerry Digi+, GPIO16 is also reserved.


# —- ——– —-
setgpio 2 ALT0 UP # I2C communication DAC chip
setgpio 3 ALT0 UP # I2C communication DAC chip
setgpio 6 INPUT DEFAULT # do not use, reserved for Master clock
setgpio 18 ALT0 DEFAULT # I2S
setgpio 19 ALT0 DEFAULT # I2S
setgpio 20 ALT0 DEFAULT # I2S
setgpio 21 ALT0 DEFAULT # I2S

That means, GPIO 2,3,6 and 18-21 are used.
Note that this are the GPIO numbers, NOT the pin numbers. These pins are used for the Digi+ and the DAC+


Raspberry Pi HIFI DiGi Digital Sound Card I2S SPDIF expansion board Digital Chip for Raspberry Pi 2/B+/A+ support Raspberry pi 3

Product Description


This is a response to the raspberry pi B+/A+ design special HIFI Digi+ expansion board (PiFi Digi+),use Wolfson company high end digital chip (WM8804G),use  I2S interface, not USB interface;After using this extension plate  the user can match the audio playback system (such as: volumio, Xbmc system) to build their own network HIFI player;Expansion board provides fiber (S/PDIF) and coaxial (RCA) two output interface convenient external amplifiers and other equipment. With it you can get rid of PC power, turn off the slow, power supply noise and so on troubled....


Function introduction:


1 digital chip uses the  Wolfson company high-end WM8804G chip, adopting I2S interface;Support 16 to 24 bit audio data formats; distortion and dynamic is very ideal, support the tall sampling rate of 192kHz, the advanced technology shake reduction can be intrinsic jitter control in 50ps RMS, high degree of reduction.

2.The output port  use optical and coaxial twointerface  output , convenient for the user to connect an external power amplifier

3 support hardware mode to control the volume (I2C interface)

4.The power supply adopts Raspberry PI supply, no need external power supply;and  use  type filter power supply design ,to reduce the interference of power supply effectively.

5 using I2S interface direct digital output, high reduction degree,not USB interface DAC methods, unoccupied raspberry pi  other extended GPIO

6.provide the power indicator light, easy to observe the expansion board state

7. the PCB board adopt gold plating process,arc wire (high-end HIFI DAC both adopt the arc line),better ensure the signal Impedance continuity, reduce the signal reflection and refraction.

8 Good sound depends on real materials,the optical fiber interface adopts imported HIFI grade high quality fiber seat,coaxial interface using Pluse import audio isolation transformer providing good  digital audio at the same time good protection of your audio device and card!!!

9. integrated infrared receiving function, in the absence of network, more convenient to control the playback

Volumio software parameters:

-FLAC, WAV, MP3, AAC, ALAC, PLS support

-Music libraries on Samba, NFS and USB drives

-Webradios support out of the box

-Control it via integrated Webui with PC, Smartphone, Tablet

-Airplay capability

-Ramplay Support

-DSD Native Playback

-Multiroom Playback via Android App

-Output playback device Selection

-Audio out I2S (from Raspberry pi's P5)

-Wireless Network configuration

-Various resampling options, up to 24bit/192kHz


Package Included:

1 pcs Digital Sound Card(not including raspberry pi 2/3/B+)

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