how to wire an external DAC and to make it output some sound using an app made with sigma studio 4.7

Hello iravelo,

We have to make sure if the serial output port 2 is set up properly, so please attach your project.

If you are confident with your register settings, then probe the serial output port 2 and see the I2S signal and send us the scope pictures. I assume the DSP is the serial clock master.

Regarding the DAC, where is MCLK to the DAC coming from? Are you using DSP's CLKOUT pin? if you are, then well and good. No problem there.

what's the sampling rate? and how are you programming the DAC?

Are you sure about the DAC if it's up and running?

it must be really simple that we are missing here, so give us some info. we will be able to solve this.

iravelo said:

how to build a .dspproj app to handle that external DAC ?

Since this is not ADI's product, SS doesn't have a DLL for this. But you can create an XML file with the DAC's registers and program it from the master control port of the DSP. The below page shows how to do that.

Go to bottom of this page.

Regarding the wire connections,

If the DSP is sending out the MCLK to the DAC then,

DSP                                   DAC

CLKOUT      ------->          MCLK

BCLK_OUT2     ----->       BCLK/SCLK

LRCLK_OUT2   ----->       LRCLK/FRAME_SYNC

SDATA_OUT2 --------->    SDATA_IN/D_IN

GND<--------------------------->GND

Regards,

Harish

hi Harish, long time no see, best wishes !

let me send my current dspproj from another computer,

but in the meantime,

I can share that the external dac users who managed to make it work (on a raspberry pi) do says there is no MCLK to connect; the clock is "derived" from its DIN (48KHz being my adau's speed, as set by default).

I do not need SS to be able to reprogram or reconfigure the external DAC board, the latter is supposed to work as is (provided the jumpers are soldered as in the following image, and its SCK is grounded )

hi Harish, long time no see, best wishes !

let me send my current dspproj from another computer,

but in the meantime,

I can share that the external dac users who managed to make it work (on a raspberry pi) do says there is no MCLK to connect; the clock is "derived" from its DIN (48KHz being my adau's speed, as set by default).

I do not need SS to be able to reprogram or reconfigure the external DAC board, the latter is supposed to work as is (provided the jumpers are soldered as in the following image, and its SCK is grounded )