Using DMA with ADC on nRF52832

[Jarmo]

Is there any ready-made example that would show how to configure nRF52 to make analog-to-digital conversions automatically on the background, without CPU intervention between samples, by using direct memory access (DMA)?

[Carsten Wulff]

Actually, SAADC on nRF52 does not need crystal clock, especially if you're not that interested in accurate timing between samples. The absolute accuracy is not affected by the high frequency clock. But if your doing signal processing on the samples then crystal will give you less jitter.

nRF51 does need crystal clock, because the ADC architecture is different.