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power down accelerometer unless a watch face requests it

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This commit is contained in:
Joey Castillo
2025-05-26 10:51:11 -04:00
parent 6ac2c13098
commit 69b8048790
5 changed files with 48 additions and 4 deletions
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29
movement.c
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@@ -40,7 +40,6 @@
#include "shell.h"
#include "utz.h"
#include "zones.h"
#include "lis2dw.h"
#include "tc.h"
#include "evsys.h"
#include "delay.h"
@@ -539,7 +538,7 @@ bool movement_disable_tap_detection_if_available(void) {
if (movement_state.has_lis2dw) {
// Ramp data rate back down to the usual lowest rate to save power.
lis2dw_set_low_noise_mode(false);
lis2dw_set_data_rate(LIS2DW_DATA_RATE_LOWEST);
lis2dw_set_data_rate(movement_state.accelerometer_background_rate);
lis2dw_set_mode(LIS2DW_MODE_LOW_POWER);
// ...disable Z axis (not sure if this is needed, does this save power?)...
lis2dw_configure_tap_threshold(0, 0, 0, 0);
@@ -550,6 +549,24 @@ bool movement_disable_tap_detection_if_available(void) {
return false;
}
lis2dw_data_rate_t movement_get_accelerometer_background_rate(void) {
if (movement_state.has_lis2dw) return movement_state.accelerometer_background_rate;
else return LIS2DW_DATA_RATE_POWERDOWN;
}
bool movement_set_accelerometer_background_rate(lis2dw_data_rate_t new_rate) {
if (movement_state.has_lis2dw) {
if (movement_state.accelerometer_background_rate != new_rate) {
lis2dw_set_data_rate(new_rate);
movement_state.accelerometer_background_rate = new_rate;
return true;
}
}
return false;
}
float movement_get_temperature(void) {
float temperature_c = (float)0xFFFFFFFF;
@@ -702,7 +719,6 @@ void app_setup(void) {
lis2dw_set_mode(LIS2DW_MODE_LOW_POWER); // select low power (not high performance) mode
lis2dw_set_low_power_mode(LIS2DW_LP_MODE_1); // lowest power mode, 12-bit
lis2dw_set_low_noise_mode(false); // low noise mode raises power consumption slightly; we don't need it
lis2dw_set_data_rate(LIS2DW_DATA_RATE_LOWEST); // sample at 1.6 Hz, lowest rate available
lis2dw_enable_stationary_motion_detection(); // stationary/motion detection mode keeps the data rate at 1.6 Hz even in sleep
lis2dw_set_range(LIS2DW_RANGE_2_G); // Application note AN5038 recommends 2g range
lis2dw_enable_sleep(); // allow acceleromter to sleep and wake on activity
@@ -730,7 +746,14 @@ void app_setup(void) {
// but it will only fire once tap recognition is enabled.
watch_register_interrupt_callback(HAL_GPIO_A3_pin(), cb_accelerometer_event, INTERRUPT_TRIGGER_RISING);
// Enable the interrupts...
lis2dw_enable_interrupts();
// ...and power down the accelerometer to save energy. This means the interrupts we just configured won't fire.
// Tap detection will ramp up sesing and make use of the A3 interrupt.
// If a watch face wants to check in on the A4 pin, it can call movement_set_accelerometer_background_rate
lis2dw_set_data_rate(LIS2DW_DATA_RATE_POWERDOWN);
movement_state.accelerometer_background_rate = LIS2DW_DATA_RATE_POWERDOWN;
} else {
watch_disable_i2c();
}