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feather-m0: add documentation on BAT voltage

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Martine Lenders 2019-06-05 22:21:22 +02:00
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15
boards/feather-m0/doc.txt
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@ -24,7 +24,20 @@ SAMD21 mcu.
### Pinout
<img src="https://cdn-learn.adafruit.com/assets/assets/000/030/921/original/adafruit_products_2772_pinout_v1_0.png"
alt="Adafruit Feather M0 proto pinout" style="width:800px;"/>
alt="Adafruit Feather M0 proto pinout" style="width:800px;"/><br/>
`AIN7` can be used to [measure the voltage of a connected Lipoly battery][battery].
It is mapped to ADC_LINE(6) in RIOT.
~~~~~~~~~~~~~~~~ {.c}
int vbat = adc_sample(ADC_LINE(6), ADC_RES_10BIT);
vbat *= 2; /* voltage was divided by 2, so multiply it back */
vbat *= 33; /* reference voltage 3.3V * 10 */
vbat /= 10240; /* resolution * 10 (because we multiplied 3.3V by 10) */
printf("Bat: %dV\n", vbat);
~~~~~~~~~~~~~~~~
[battery]: https://learn.adafruit.com/adafruit-feather-m0-basic-proto/power-management#measuring-battery-4-9
### Flash the board