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Use Hifiberry DAC+/Pro without Raspberry Pi

holtmann

January 05, 2016 22:23

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Hi,

I just wanted to know, if its technical possible to use the HifiBerry DAC+ or DAC Pro without a Raspberry PI. My goal would be to supply an I2S signal to the Hifiberry, do control via I2C via a simple micro controller and of course supply the required 5V. In my theory this should work or is there anything else to consider? 

Cheers,

Hendrik

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9 comments

• 0
  
  HiFiBerry team January 06, 2016 06:06

  Hi Hendrik,

  in theory this can work. However, this is basically a complete new electronics design. Note that we can't you support with this.

  Best regards
  Daniel

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  Bengt Nilsson June 22, 2020 16:13

  Hi,

  This is exactly what I want to do also, although I understand it it will be completely unsupported by Hifiberry.

  I am working on my own DSP project, and I want to send the output to a high quality I2S DAC.

  Can you specify what pins are needed to run the DAC+Pro?

  I understand GND, +5V, and the I2S terminals, of course.

  What other pins are essential? Is the !2C config pins necessary or can it run on default?

  BN

   

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  Bengt Nilsson September 18, 2020 08:11

  A straight question about using the DAC+Pro hat without RPI:

  If I connect the 5V supply to the 5VDC 2-pin connector, and the I2S signals from another source to the 5-pin I2S connector, will I get analog output immediately?

  Or is it mandatory to send some I2C config data via the 40-pin hat contact first?  I.e. is the default setting using the external I2S MCLK and an optional I2C config to use the on-board DAC clock?

   

  BN

   

   

• 0
  
  HiFiBerry team September 18, 2020 08:37

  You won't get any output. The DAC needs to be initialized correctly. That's what the driver on Linux does.

• 0
  
  Bengt Nilsson September 18, 2020 08:42

  Ok, I see.

  So I need to study the DAC data sheet to find the required I2C commands, correct?

  I will try to drive it from a ADSP-SC589 DSP evaluation card.

  BN

   

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  HiFiBerry team September 18, 2020 08:43

  Yes, you need to study the data sheets. Please note that as written above, we can't give any support with this.I would not recommend this, but rather use the DAC+ Light that does not require initialisation.

   

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  Bengt Nilsson September 18, 2020 08:45

  I understand. 

  Just to complete, what BB chip are you using on the DAC+?

  BN

• 0
  
  Bengt Nilsson September 18, 2020 08:46

  Just asking because I already have a DAC+...

  Does the DAC+ Light have a I2S connector on the PCB?

  BN

• 0
  
  Bengt Nilsson September 21, 2020 06:40

  On Dac+ HW v2.2, there is a SM pushbutton JP1. What is it for?