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SAADC callback never called with Softdevice

Hello, I'm having trouble to understand why the saadc buffer is not being filled.

I had already tested this functionality without the softdevice, and everything worked fine but now, with the softdevice,

I found that the "saadc_callback" function is not called at any time. 
I tried to follow some clues after reading several posts here on the blog on this subject, but they did not lead me to a solution.

Tested items:
Modify saadc to continuous mode.
Modify the saadc interrupt priority.


The timer for the PPI ist the TIMER1

Thanks