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document the accelerometer setup

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This commit is contained in:
joeycastillo 2024-10-14 12:38:13 -04:00
parent e5c568b757
commit ea8c55744b
1 changed files with 6 additions and 1 deletions
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7
movement.c
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@ -634,13 +634,18 @@ void app_setup(void) {
lis2dw_configure_int1(LIS2DW_CTRL4_INT1_6D);
watch_register_interrupt_callback(HAL_GPIO_A4_pin(), cb_motion_interrupt_1, INTERRUPT_TRIGGER_RISING);
// INT2 is on A3 which can increment TC2.
// configure the accelerometer to fire INT2 when its sleep state changes.
lis2dw_configure_int2(LIS2DW_CTRL5_INT2_SLEEP_CHG);
// INT2 is wired to pin A3. set it up on the external interrupt controller.
HAL_GPIO_A3_in();
HAL_GPIO_A3_pmuxen(HAL_GPIO_PMUX_EIC);
eic_configure_pin(HAL_GPIO_A3_pin(), INTERRUPT_TRIGGER_FALLING);
// but rather than firing an interrupt, we'll have it generate an event instead.
eic_enable_event(HAL_GPIO_A3_pin());
// we can route the EXTINT3 event generator to the TC2 event user...
evsys_configure_channel(0, EVSYS_ID_GEN_EIC_EXTINT_3, EVSYS_ID_USER_TC2_EVU, true, true);
// and use the TC2 event to count the number of times the sleep state changes.
// note that this doesn't actually wake the watch — we can maintain this count even in standby.
tc_init(2, GENERIC_CLOCK_3, TC_PRESCALER_DIV1);
tc_set_event_action(2, TC_EVENT_ACTION_COUNT);
tc_set_counter_mode(2, TC_COUNTER_MODE_16BIT);