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nordic: reduce sleep current by using SENSE feature for PinAlarm when possible #9534

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Aug 19, 2024
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nordic: reduce sleep current by using SENSE feature for PinAlarm when possible #9534

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7 changes: 6 additions & 1 deletion ports/nordic/common-hal/alarm/pin/PinAlarm.c
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Original file line number Diff line number Diff line change
Expand Up @@ -123,11 +123,16 @@ void alarm_pin_pinalarm_reset(void) {
static void configure_pins_for_sleep(void) {
_pinhandler_gpiote_count = 0;

int n_pin_alarms = __builtin_popcountll(high_alarms) + __builtin_popcountll(low_alarms);
const int MAX_N_PIN_ALARMS_FOR_SENSE_FEATURE = 2;

nrfx_gpiote_in_config_t cfg = {
.sense = NRF_GPIOTE_POLARITY_TOGGLE,
.pull = NRF_GPIO_PIN_PULLUP,
.is_watcher = false,
.hi_accuracy = true,
// hi_accuracy = False reduces sleep current by a factor of ~10x by using the SENSE feature,
// but only works if not more than MAX_N_PIN_ALARMS_FOR_SENSE_FEATURE pin alarms are used.
.hi_accuracy = (n_pin_alarms > MAX_N_PIN_ALARMS_FOR_SENSE_FEATURE),
.skip_gpio_setup = false
};
for (size_t i = 0; i < 64; ++i) {
Expand Down