I2S BCLK and double signal issue

[bojerko]

I am trying the demo from github (https://github.com/andenore/NordicSnippets/blob/master/examples/i2s_master/main.c) with nrf52 demo board and when checking the signal on BCLK I see that it is doubled. Like 

Any ideas why this is happening?

[Håkon Alseth]

Hi,

 

This type of signal is normally due to bad grounding. Could you check your connection and see if it improves?

 

Kind regards,

Håkon

[bojerko]

Yes. It looks like it was really a GND issue. Not sure what I did, but managed to get the proper signal to the screen.

I'm still struggling with the i2s one sine demo from the examples, since I don't get a sine signal on the scope.