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
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
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
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
You won't get any output. The DAC needs to be initialized correctly. That's what the driver on Linux does.
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
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.
I understand.
Just to complete, what BB chip are you using on the DAC+?
BN
Just asking because I already have a DAC+...
Does the DAC+ Light have a I2S connector on the PCB?
BN
On Dac+ HW v2.2, there is a SM pushbutton JP1. What is it for?
I have now implemented I2C in my HW design.
Could you please reveal the I2C setup sequence necessary to make the DAC+ work?
There is no simple "setup sequence", you really need to understand the chip and it's internals. The driver code can be found in the Linux kernel:
https://github.com/raspberrypi/linux/blob/rpi-5.10.y/sound/soc/codecs/pcm512x.c
Ok, thanks!
/BN
Hi I also have this configuration need.
Have you found the right configuration to run in i2c?
because i'm having a bit of difficulty
