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movement: add voltage monitor watch face

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This commit is contained in:
Joey Castillo
2021-11-06 23:52:00 -04:00
parent 88f41b12fc
commit 0f03257ee9
6 changed files with 163 additions and 0 deletions
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29
watch-library/watch/watch_adc.c
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@@ -138,6 +138,35 @@ void watch_set_analog_sampling_length(uint8_t cycles) {
_watch_sync_adc();
}
void watch_set_analog_reference_voltage(watch_adc_reference_voltage reference) {
ADC->CTRLA.bit.ENABLE = 0;
if (reference == ADC_REFERENCE_INTREF) SUPC->VREF.bit.VREFOE = 1;
else SUPC->VREF.bit.VREFOE = 0;
ADC->REFCTRL.bit.REFSEL = reference;
ADC->CTRLA.bit.ENABLE = 1;
_watch_sync_adc();
// throw away one measurement after reference change (the channel doesn't matter).
_watch_get_analog_value(ADC_INPUTCTRL_MUXPOS_SCALEDCOREVCC);
}
uint16_t watch_get_vcc_voltage() {
// stash the previous reference so we can restore it when we're done.
uint8_t oldref = ADC->REFCTRL.bit.REFSEL;
// if we weren't already using the internal reference voltage, select it now.
if (oldref != ADC_REFERENCE_INTREF) watch_set_analog_reference_voltage(ADC_REFERENCE_INTREF);
// get the data
uint32_t raw_val = _watch_get_analog_value(ADC_INPUTCTRL_MUXPOS_SCALEDIOVCC_Val);
// restore the old reference, if needed.
if (oldref != ADC_REFERENCE_INTREF) watch_set_analog_reference_voltage(oldref);
return (uint16_t)((raw_val * 1000) / (1024 * 1 << ADC->AVGCTRL.bit.SAMPLENUM));
}
inline void watch_disable_analog_input(const uint8_t pin) {
gpio_set_pin_function(pin, GPIO_PIN_FUNCTION_OFF);
}