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DAC+ minimal Pin-Configuration

Hi guys!

I am trying set up a DAC+ on a Raspberry Pi 3 with jumper-cables for testing.

I connected 3.3v, 5v, Gnd and GPIOs 18, 19, 21 and Pins 27+28:

Config.txt contains:
dtparam=audio=off
dtoverlay=pi3-disable-bt
dtoverlay=hifiberry-dacplus

Modules:
snd_soc_bcm2708
bcm2708_dmaengine
snd_soc_pcm512x
snd_soc_hifiberry_dacplus

 

But there is no sounddevice found:

pi@raspberrypi:~ $ aplay -l
aplay: device_list:268: no soundcards found...

I ran a PCM5102 on i2s before that in similar configuration on GPIO 18,19 an 21 an that worked out fine. 

Raspberry is up to date: Linux raspberrypi 4.4.8-v7+

Any idea how to fix this? Do I need to connect I2C as well? I have something connected to this, so I did not try this.

Greetings!

Martin

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