[riot-notifications] [RIOT-OS/RIOT] cpu/qn908x: ADC support (#15847)

iosabi notifications at github.com
Sun Jan 24 23:18:29 CET 2021

@iosabi commented on this pull request.

> +config BOARD_HAS_ADC_PA06_CAP
+    bool
+    help
+         Indicates that the board has an external capacitor connected to PA06
+         which shold be used to stabilize the ADC reference voltage.
+         This external capacitor is optional but it can reduce the noise of the
+         ADC sampling.

Note that this block doesn't have a `prompt`, only a config so this doesn't show up in the user menu but it can be defined from the board's Kconfig. I did something similar for the clocks (whether there's a crystal on the board or not) although in that case there were Kconfig user prompts that depend on some of those settings.

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