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

iosabi notifications at github.com
Sun Jan 24 23:35:23 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.

It looks like it does. I just tried:
rm tests/periph_adc/bin -r
make BOARD=qn9080dk -C tests/periph_adc
grep BOARD_HAS_XTAL32K tests/periph_adc -r
and the macro shows up in `tests/periph_adc/bin/qn9080dk/riotbuild/riotbuild.h`.

I honestly don't know if Kconfig or periph_cpu.h is the preferred way for this sort of config, but the "BOARD_HAS_..." macros where here so I added it here.

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