LightColor color;
bool light_on;
uint8_t wake_count;
- bool enter_deep_sleep;
+ bool enter_sleep_mode;
} ApplicationState;
ApplicationState application_state;
* @see watch_enter_deep_sleep()
*/
void app_wake_from_deep_sleep() {
- // retrieve our application state from the backup registers
- application_state.mode = (ApplicationMode)watch_get_backup_data(0);
- application_state.color = (LightColor)watch_get_backup_data(1);
- application_state.wake_count = (uint8_t)watch_get_backup_data(2) + 1;
-
- // wait a moment for the user's finger to be off the button
- delay_ms(250);
+ // this app only supports shallow sleep mode.
}
/**
break;
}
- if (application_state.enter_deep_sleep) {
- application_state.enter_deep_sleep = false;
-
- // stash our application state in the backup registers
- watch_store_backup_data((uint32_t)application_state.mode, 0);
- watch_store_backup_data((uint32_t)application_state.color, 1);
- watch_store_backup_data((uint32_t)application_state.wake_count, 2);
-
- // turn off the LED
- watch_set_led_off();
-
+ if (application_state.enter_sleep_mode) {
// wait a moment for the user's finger to be off the button
delay_ms(250);
// nap time :)
- watch_enter_deep_sleep(NULL);
+ watch_enter_shallow_sleep(NULL);
+
+ // we just woke up; wait a moment again for the user's finger to be off the button...
+ delay_ms(250);
+
+ // and prevent ourselves from going right back to sleep.
+ application_state.enter_sleep_mode = false;
+
+ // finally, after sleep, return false so that our app loop runs again and updates the display.
+ return false;
}
return true;
}
void cb_alarm_pressed() {
- application_state.enter_deep_sleep = true;
+ application_state.enter_sleep_mode = true;
}
_extwake_register_callback(&CALENDAR_0.device, extwake_callback);
}
+void watch_disable_extwake_interrupt(uint8_t pin) {
+ hri_rtc_tampctrl_reg_t config = hri_rtc_get_TAMPCTRL_reg(RTC, 0xFFFFFFFF);
+
+ switch (pin) {
+ case A4:
+ a4_callback = NULL;
+ config &= ~(3 << RTC_TAMPCTRL_IN0ACT_Pos);
+ break;
+ case A2:
+ a2_callback = NULL;
+ config &= ~(3 << RTC_TAMPCTRL_IN1ACT_Pos);
+ break;
+ case BTN_ALARM:
+ btn_alarm_callback = NULL;
+ config &= ~(3 << RTC_TAMPCTRL_IN2ACT_Pos);
+ break;
+ default:
+ return;
+ }
+
+ if (hri_rtcmode0_get_CTRLA_ENABLE_bit(RTC)) {
+ hri_rtcmode0_clear_CTRLA_ENABLE_bit(RTC);
+ hri_rtcmode0_wait_for_sync(RTC, RTC_MODE0_SYNCBUSY_ENABLE);
+ }
+ hri_rtc_write_TAMPCTRL_reg(RTC, config);
+ hri_rtcmode0_set_CTRLA_ENABLE_bit(RTC);
+}
+
void watch_store_backup_data(uint32_t data, uint8_t reg) {
if (reg < 8) {
RTC->MODE0.BKUP[reg].reg = data;
MCLK->APBCMASK.reg &= ~MCLK_APBCMASK_SERCOM3;
}
-void watch_enter_deep_sleep(char *message) {
- // configure the ALARM interrupt (the callback doesn't matter)
- watch_register_extwake_callback(BTN_ALARM, NULL, true);
-
+void watch_enter_shallow_sleep(char *message) {
if (message != NULL) {
watch_display_string(" ", 0);
watch_display_string(message, 0);
// disable all pins
_watch_disable_all_pins_except_rtc();
- // turn off RAM completely.
- PM->STDBYCFG.bit.BBIASHS = 3;
-
- // enter standby (4); we basically hang out here until an interrupt forces us to reset.
+ // enter standby (4); we basically hang out here until an interrupt wakes us.
sleep(4);
- NVIC_SystemReset();
+ // and we awake! re-enable the brownout detector
+ SUPC->INTENSET.bit.BOD33DET = 1;
+
+ // call app_setup so the app can re-enable everything we disabled.
+ app_setup();
+
+ // and call app_wake_from_sleep (since main won't have a chance to do it)
+ app_wake_from_sleep();
}
-void watch_enter_backup_mode() {
+void watch_enter_deep_sleep() {
// this will not work on the current silicon revision, but I said in the documentation that we do it.
// so let's do it!
watch_register_extwake_callback(BTN_ALARM, NULL, true);
*/
void watch_register_extwake_callback(uint8_t pin, ext_irq_cb_t callback, bool level);
-/** @brief Unregisters the interrupt on one of the EXTWAKE pins. This will prevent a value change on
- * one of these pins from waking the device from deep sleep or BACKUP modes.
+/** @brief Unregisters the RTC interrupt on one of the EXTWAKE pins. This will prevent a value change on
+ * one of these pins from waking the device from shallow and deep sleep modes.
* @param pin Either pin BTN_ALARM, A2, or A4. If the pin is BTN_ALARM, this function DOES NOT disable
* the internal pull down on that pin.
*/
-void watch_disable_extwake_interrupt(uint8_t pin, ext_irq_cb_t callback, bool level);
+void watch_disable_extwake_interrupt(uint8_t pin);
-/** @brief Stores data in one of the RTC's backup registers, which retain their data in the deep sleep
- and backup modes.
+/** @brief Stores data in one of the RTC's backup registers, which retain their data in deep sleep mode.
* @param data An unsigned 32 bit integer with the data you wish to store.
* @param reg A register from 0-7.
*/
*/
uint32_t watch_get_backup_data(uint8_t reg);
-/** @brief Enters a deep sleep mode by disabling RAM retention and all peripherals except the RTC and
- * (optionally) the LCD. You can wake from this mode by pressing the ALARM button.
- * @param message Either NULL, or a string representing a message to display while in deep sleep mode. The
- * message will be displayed at position 0, so you should pad out the beginning of the string
- * with spaces if you wish for the message to appear on line 2, i.e. " SLEEP". If this
- * parameter is NULL, the screen will be blanked, and this function will disable the SLCD
- * peripheral for additional power savings. (also note that while the message will replace any
- * text on the display, this function will not clear any indicators you have set. This is by
- * design, in case you wish to leave an indicator lit in sleep mode.)
- * @details This deep sleep mode is not the lowest power mode available (see watch_enter_backup_mode), but
- * it has the benefit of being able to wake with a press of the ALARM button, and provides an option
- * for displaying a message to the user when asleep. The only way to wake from this mode is by
- * pressing the ALARM button, or receiving an interrupt on pin A2 or A4 of the nine-pin connector.
- * (An alarm interrupt would also work, but this has not yet been implemented.) This function enables
- * the ALARM button interrupt for you, but if you wish to wake from the A2 or A4 RTC interrupt, you
- * must configure them by calling watch_register_extwake_callback. Note however that your callback
- * will not be called in this case.
- * Power consumption in deep sleep mode varies a bit with the battery voltage and the temperature,
- * but at 3 V and ~25° C you can eoughly estimate:
- * * ~12µA current draw with the LCD controller on (message != NULL)
- * * ~6.5µA current draw with the LCD controller off (message == NULL)
- * @note With RAM powered off, your application state will be cleared as soon as you call this function, and
- * when the user wakes up the watch, your app will effectively be waking from reset. Your app's @ref
- * app_wake_from_deep_sleep function will be called to give your app a chance to restore any state that
- * you stored using @ref watch_store_backup_data.
+/** @brief Enters a shallow sleep mode by disabling all pins and peripherals except the RTC and (optionally)
+ * the LCD. You can wake from this mode by pressing the ALARM button, if you have an registered an
+ * external wake callback on the ALARM button. When your app wakes from this shallow sleep mode, your
+ * app_setup method will be called, since this function will have disabled things you set up.
+ * @param message Either NULL, or a string representing a message to display while in shallow sleep mode. If
+ * this parameter is NULL, the screen will be blanked out, and this function will disable the
+ * SLCD peripheral for additional power savings. If the message is non-NULL, it will replace
+ * any text on the screen, and will be displayed at position 0 (so you should pad out the beginning
+ * of the string with spaces if you wish for the message to appear on line 2, i.e. " SLEEP").
+ * Also note that this function will NOT clear any indicator segments that you have set. This is
+ * by design, in case you wish to leave an indicator lit in sleep mode.
+ * @details This shallow sleep mode is not the lowest power mode available (see watch_enter_deep_sleep), but
+ * it has the benefit of retaining your application state and being able to wake from the ALARM button.
+ * It also provides an option for displaying a message to the user when asleep. Note that whether you
+ * want to wake from the ALARM button, the A2 RTC interrupt or the A4 interrupt, you must configure
+ * this by calling watch_register_extwake_callback first.
+ *
+ * Power consumption in shallow sleep mode varies a bit with the battery voltage and the temperature,
+ * but at 3 V and 25~30° C you can roughly estimate:
+ * * < 12µA current draw with the LCD controller on (message != NULL)
+ * * < 6µA current draw with the LCD controller off (message == NULL)
*/
-void watch_enter_deep_sleep(char *message);
+void watch_enter_shallow_sleep(char *message);
/** @brief Enters the SAM L22's lowest-power mode, BACKUP.
* @details This function does some housekeeping before entering BACKUP mode. It first disables all
* this function unless you have a device on the nine-pin connector with an external interrupt
* on pin A2 or A4 (i.e. an accelerometer with an interrupt pin).
*/
-void watch_enter_backup_mode();
+void watch_enter_deep_sleep();
/// @}
projects / sensor-watch.git / commitdiff