Raspberry pi 2 B i2s to minidsp minisharc

Diy and Tweaks Diy Volumio Projects
1

Hi,

A couple people seem to have had success connecting a pi to a minisharc but there aren’t many details out there. Minidsp says that it should work on their forums.

I have volumio installed on my pi, connections have been made according to (minidsp.com/images/document … Manual.pdf).

pin 39 on Rpi (gnd) to pin 5 on minisharc (gnd)
pin 40 on Rpi (data) to pin 10 on minisharc (I2S_DATA_IN1&2)
pin 35 on Rpi (lrck) to pin 14 on minisharc (I2S_IN_LRCLK)
pin 12 on Rpi (bck) to pin 15 on minisharc (I2S_IN_BCLK)

I set the i2s driver to “Rpi-dac” in volumio (tried them all though). The minisharc is set to i2s input slave (minidsp.com/forum/suggestion-bo … -minishark).

I don’t get any input on the view meters in the minisharc software. Sending a signal into it’s spdif from a cd player works fine.

Am I missing something with volumio and the i2s output of the pi?

A pic of the setup is attached.
IMG_20160101_123504.jpg

2

Since volumio doesn’t detect the minisharc as a valid “audio output”, is it possible I need to force volumio to output a signal on the i2s lines? Like add something to the config.txt file? I really don’t think I’m getting anything out of the pi.

3

I got my hands on an oscilloscope and there is no data coming out of my i2s lines. Can someone please post info on how to get a generic i2s signal out of my pi 2B?

4

Am I posting this in the right place? Are there others out there running i2s out of a pi 2 B?

5

Hi
I made the exactly same setup yesterday and Im in the same situation.
According to google there are better ways than Volumio. Pity, kinda used to it.

6

Now
Good news. Just tried the hifiberry dac setting for the second time. Rebooted and voila.
rpi2sharc.jpg

7

Hey!
What is this strange “machine” full of capacitors ? :astonished: :astonished:
I’m curious ! :laughing:

8

Urmet,

Your solution worked for me! Thanks! Also, in my first image, one of the wires going to my minisharc is wrong but the pinouts I listed are right. Attached are images of the working setup. I’m using 1.55 with no other changes than enabling the i2s driver.
IMG_20160106_070759.jpg
IMG_20160106_070707.jpg
IMG_20160106_070622.jpg

9

More pics…
IMG_20160106_070739.jpg
IMG_20160106_070751.jpg

10

Got my setup fully going and it sounds excellent. The pi runs into a minisharc and then to a pair of curryman dacs. The dacs are powered by an amb sigma 11 and a twisted pear low current bipolar psu. The other two power bricks are for the minisharc and the USB hub powering the pi. I also threw in a twisted pear optical to spdif and hooked that to the sharc so I could use other sources. The small board at the front is a volume front panel that gives the sharc a volume knob, source selection and an IR input. Thanks for the help guys!
IMG_20160110_203328.jpg

11

Hi there
Awesome project!
Could you please share how are you feeding he shrac? I mean - what is the sampling rate of the music you playing from Raspberry?
Does it take everything from 44kHz to 96kHz?
I’ll be grateful for a tip :slight_smile: as I’m not sure how does it work…
Thanks a lot