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accelerometer: don't initialize on wake if already set up

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Joey Castillo 2025-06-11 23:25:08 -04:00
parent bb5aa4ff7c
commit 1a5ccd34a0
1 changed files with 40 additions and 37 deletions
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77
movement.c
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@ -716,50 +716,53 @@ void app_setup(void) {
watch_register_interrupt_callback(HAL_GPIO_BTN_ALARM_pin(), cb_alarm_btn_interrupt, INTERRUPT_TRIGGER_BOTH);
#ifdef I2C_SERCOM
watch_enable_i2c();
if (lis2dw_begin()) {
movement_state.has_lis2dw = true;
// if accelerometer was already detected and set up, no need to set it up again.
if (!movement_state.has_lis2dw) {
watch_enable_i2c();
if (lis2dw_begin()) {
movement_state.has_lis2dw = true;
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_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
lis2dw_configure_wakeup_threshold(32); // g threshold to wake up: (THS * FS / 64) where FS is "full scale" of ±2g.
lis2dw_configure_6d_threshold(3); // 0-3 is 80, 70, 60, or 50 degrees. 50 is least precise, hopefully most sensitive?
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_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
lis2dw_configure_wakeup_threshold(32); // g threshold to wake up: (THS * FS / 64) where FS is "full scale" of ±2g.
lis2dw_configure_6d_threshold(3); // 0-3 is 80, 70, 60, or 50 degrees. 50 is least precise, hopefully most sensitive?
// set up interrupts:
// INT1 is wired to pin A3. We'll configure the accelerometer to output an interrupt on INT1 when it detects an orientation change.
/// TODO: We had routed this interrupt to TC2 to count orientation changes, but TC2 consumed too much power.
/// Orientation changes helped with sleep tracking; would love to bring this back if we can find a low power solution.
/// For now, commenting these lines out; check commit 27f0c629d865f4bc56bc6e678da1eb8f4b919093 for power-hungry but working code.
// lis2dw_configure_int1(LIS2DW_CTRL4_INT1_6D);
// HAL_GPIO_A3_in();
// set up interrupts:
// INT1 is wired to pin A3. We'll configure the accelerometer to output an interrupt on INT1 when it detects an orientation change.
/// TODO: We had routed this interrupt to TC2 to count orientation changes, but TC2 consumed too much power.
/// Orientation changes helped with sleep tracking; would love to bring this back if we can find a low power solution.
/// For now, commenting these lines out; check commit 27f0c629d865f4bc56bc6e678da1eb8f4b919093 for power-hungry but working code.
// lis2dw_configure_int1(LIS2DW_CTRL4_INT1_6D);
// HAL_GPIO_A3_in();
// next: INT2 is wired to pin A4. We'll configure the accelerometer to output the sleep state on INT2.
// a falling edge on INT2 indicates the accelerometer has woken up.
lis2dw_configure_int2(LIS2DW_CTRL5_INT2_SLEEP_STATE | LIS2DW_CTRL5_INT2_SLEEP_CHG);
HAL_GPIO_A4_in();
// next: INT2 is wired to pin A4. We'll configure the accelerometer to output the sleep state on INT2.
// a falling edge on INT2 indicates the accelerometer has woken up.
lis2dw_configure_int2(LIS2DW_CTRL5_INT2_SLEEP_STATE | LIS2DW_CTRL5_INT2_SLEEP_CHG);
HAL_GPIO_A4_in();
// Wake on motion seemed like a good idea when the threshold was lower, but the UX makes less sense now.
// Still if you want to wake on motion, you can do it by uncommenting this line:
// watch_register_extwake_callback(HAL_GPIO_A4_pin(), cb_accelerometer_wake, false);
// Wake on motion seemed like a good idea when the threshold was lower, but the UX makes less sense now.
// Still if you want to wake on motion, you can do it by uncommenting this line:
// watch_register_extwake_callback(HAL_GPIO_A4_pin(), cb_accelerometer_wake, false);
// later on, we are going to use INT1 for tap detection. We'll set up that interrupt here,
// but it will only fire once tap recognition is enabled.
watch_register_interrupt_callback(HAL_GPIO_A3_pin(), cb_accelerometer_event, INTERRUPT_TRIGGER_RISING);
// later on, we are going to use INT1 for tap detection. We'll set up that interrupt here,
// 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();
// 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();
// ...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();
}
}
#endif