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watch_adc: enable ADC when checking battery; let's get rid of this footgun once and for all

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This commit is contained in:
Joey Castillo
2025-05-21 08:51:39 -04:00
parent 07a085e90b
commit 310ad3d095
10 changed files with 10 additions and 17 deletions
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3
watch-library/shared/watch/watch_adc.h
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@@ -53,7 +53,8 @@ void watch_enable_analog_input(const uint16_t pin);
uint16_t watch_get_analog_pin_level(const uint16_t pin);
/** @brief Returns the voltage of the VCC supply in millivolts (i.e. 3000 mV == 3.0 V). If running on
* a coin cell, this will be the battery voltage.
* a coin cell, this will be the battery voltage. If the ADC is not running when this function
* is called, it enabled the ADC briefly, and returns it to the off state.
* @details Unlike other ADC functions, this function does not return a raw value from the ADC, but
* rather scales it to an actual number of millivolts. This is because the ADC doesn't let
* us measure VCC per se; it instead lets us measure VCC / 4, and we choose to measure it