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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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8
watch-library/hardware/watch/watch_adc.c
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@@ -67,6 +67,11 @@ void _watch_set_analog_reference_voltage(uint8_t reference) {
uint16_t watch_get_vcc_voltage(void) {
// stash the previous reference so we can restore it when we're done.
uint8_t oldref = ADC->REFCTRL.bit.REFSEL;
// same with the previous state of the ADC
bool adc_was_disabled = !adc_is_enabled();
// enable the ADC if needed
if (adc_was_disabled) watch_enable_adc();
// if we weren't already using the internal reference voltage, select it now.
if (oldref != ADC_REFCTRL_REFSEL_INTREF_Val) _watch_set_analog_reference_voltage(ADC_REFCTRL_REFSEL_INTREF_Val);
@@ -77,6 +82,9 @@ uint16_t watch_get_vcc_voltage(void) {
// restore the old reference, if needed.
if (oldref != ADC_REFCTRL_REFSEL_INTREF_Val) _watch_set_analog_reference_voltage(oldref);
// and restore the ADC to its previous state
if (adc_was_disabled) watch_disable_adc();
return (uint16_t)((raw_val * 1000) / (1024 * 1 << ADC->AVGCTRL.bit.SAMPLENUM));
}