Style changes and wakeup detection

main.c

@@ -323,12 +323,12 @@ STATIC bool run_code_py(safe_mode_t safe_mode) {
 
     rgb_status_animation_t animation;
     prep_rgb_status_animation(&result, found_main, safe_mode, &animation);
-    bool asleep = false;
+    bool fake_sleeping = false;
     while (true) {
         RUN_BACKGROUND_TASKS;
         if (reload_requested) {
             #if CIRCUITPY_ALARM
-            if (asleep) {
+            if (fake_sleeping) {
                 board_init();
             }
             #endif
@@ -339,7 +339,7 @@ STATIC bool run_code_py(safe_mode_t safe_mode) {
 
         if (serial_connected() && serial_bytes_available()) {
             #if CIRCUITPY_ALARM
-            if (asleep) {
+            if (fake_sleeping) {
                 board_init();
             }
             #endif
@@ -355,7 +355,7 @@ STATIC bool run_code_py(safe_mode_t safe_mode) {
         // an alarm alerts faster than our USB delay or if we pretended to deep
         // sleep.
         #if CIRCUITPY_ALARM
-        if (asleep && common_hal_alarm_woken_from_sleep()) {
+        if (fake_sleeping && common_hal_alarm_woken_from_sleep()) {
             serial_write_compressed(translate("Woken up by alarm.\n"));
             board_init();
             supervisor_set_run_reason(RUN_REASON_STARTUP);
@@ -394,14 +394,12 @@ STATIC bool run_code_py(safe_mode_t safe_mode) {
         if (result.return_code & PYEXEC_DEEP_SLEEP) {
             // Make sure we have been awake long enough for USB to connect (enumeration delay).
             int64_t connecting_delay_ticks = CIRCUITPY_USB_CONNECTED_SLEEP_DELAY * 1024 - port_get_raw_ticks(NULL);
-            if (connecting_delay_ticks > 0) {
+            // Until it's safe to decide whether we're real/fake sleeping, just run the RGB
-                // Set when we've waited long enough so that we wake up from the
+            // if (connecting_delay_ticks > 0) {
-                // port_idle_until_interrupt below and loop around to the real deep
+            //     port_interrupt_after_ticks(connecting_delay_ticks);
-                // sleep in the else clause.
+            // // } else if (!fake_sleeping) {
-                port_interrupt_after_ticks(connecting_delay_ticks);
+            if (connecting_delay_ticks < 0 && !fake_sleeping) {
-            // Deep sleep if we're not connected to a host.
+                fake_sleeping = true;
-            } else if (!asleep) {
-                asleep = true;
                 new_status_color(BLACK);
                 board_deinit();
                 if (!supervisor_workflow_active()) {
@@ -416,7 +414,7 @@ STATIC bool run_code_py(safe_mode_t safe_mode) {
         }
         #endif
 
-        if (!asleep) {
+        if (!fake_sleeping) {
             tick_rgb_status_animation(&animation);
         } else {
             // This waits until a pretend deep sleep alarm occurs. They are set

ports/esp32s2/common-hal/alarm/pin/PinAlarm.c

@@ -101,7 +101,7 @@ bool alarm_pin_pinalarm_woke_us_up(void) {
 }
 
 mp_obj_t alarm_pin_pinalarm_get_wakeup_alarm(size_t n_alarms, const mp_obj_t *alarms) {
-    // First, check to see if we match any given alarms.
+    // For light sleep, we check if we match any existing alarms
     uint64_t pin_status = ((uint64_t) pin_63_32_status) << 32 | pin_31_0_status;
     for (size_t i = 0; i < n_alarms; i++) {
         if (!MP_OBJ_IS_TYPE(alarms[i], &alarm_pin_pinalarm_type)) {
@@ -112,6 +112,7 @@ mp_obj_t alarm_pin_pinalarm_get_wakeup_alarm(size_t n_alarms, const mp_obj_t *al
             return alarms[i];
         }
     }
+    // For deep sleep, a new alarm must be created
     esp_sleep_wakeup_cause_t cause = esp_sleep_get_wakeup_cause();
     size_t pin_number = 64;
     if (cause == ESP_SLEEP_WAKEUP_EXT0) {
@@ -151,7 +152,7 @@ static uint64_t high_alarms = 0;
 static uint64_t low_alarms = 0;
 static uint64_t pull_pins = 0;
 
-void alarm_pin_pinalarm_reset(void) {
+void alarm_pin_pinalarm_reset_alarms(void) {
     if (gpio_interrupt_handle != NULL) {
         esp_intr_free(gpio_interrupt_handle);
         gpio_interrupt_handle = NULL;

ports/stm/boards/feather_stm32f405_express/board.c

@@ -37,6 +37,3 @@ bool board_requests_safe_mode(void) {
 void reset_board(void) {
 
 }
-
-void board_deinit(void) {
-}

ports/stm/common-hal/alarm/__init__.c

@@ -39,70 +39,73 @@
 #include "supervisor/port.h"
 #include "supervisor/shared/workflow.h"
 
+#define STM_WAKEUP_UNDEF    0
 #define STM_WAKEUP_GPIO     1
-#define STM_WAKEUP_TIMER    2
+#define STM_WAKEUP_RTC      2
+
+#define STM_ALARM_FLAG      RTC->BKP0R
 
 void common_hal_alarm_reset(void) {
+    // Reset the alarm flag
+    STM_ALARM_FLAG = 0x00;
     // alarm_sleep_memory_reset();
     alarm_pin_pinalarm_reset();
     alarm_time_timealarm_reset();
-    // alarm_touch_touchalarm_reset();
     // esp_sleep_disable_wakeup_source(ESP_SLEEP_WAKEUP_ALL);
 }
 
 STATIC uint8_t _get_wakeup_cause(void) {
+    // If in light/fake sleep, check modules
     if (alarm_pin_pinalarm_woke_us_up()) {
         return STM_WAKEUP_GPIO;
     }
     if (alarm_time_timealarm_woke_us_up()) {
-        return STM_WAKEUP_TIMER;
+        return STM_WAKEUP_RTC;
     }
-    return 0;
+    if (RTC->BKP0R & 0x01) {
+        // We've woken from deep sleep. Was it the WKUP pin or the RTC?
+        if (RTC->ISR & RTC_FLAG_ALRBF) {
+            // Alarm B is the deep sleep alarm
+            return STM_WAKEUP_RTC;
+        } else {
+            return STM_WAKEUP_GPIO;
+        }
+    }
+    return STM_WAKEUP_UNDEF;
 }
 
 bool common_hal_alarm_woken_from_sleep(void) {
-    return _get_wakeup_cause() != 0;
+    return _get_wakeup_cause() != STM_WAKEUP_UNDEF;
 }
 
 STATIC mp_obj_t _get_wake_alarm(size_t n_alarms, const mp_obj_t *alarms) {
     if (alarm_pin_pinalarm_woke_us_up()) {
         return alarm_pin_pinalarm_get_wakeup_alarm(n_alarms, alarms);
     }
-    // esp_sleep_wakeup_cause_t cause = _get_wakeup_cause();
+    uint8_t cause = _get_wakeup_cause();
-    // switch (cause) {
+    switch (cause) {
-    //     case ESP_SLEEP_WAKEUP_TIMER: {
+        case STM_WAKEUP_RTC: {
-    //         return alarm_time_timealarm_get_wakeup_alarm(n_alarms, alarms);
+            return alarm_time_timealarm_get_wakeup_alarm(n_alarms, alarms);
-    //     }
+        }
-
+        case STM_WAKEUP_GPIO: {
-    //     case ESP_SLEEP_WAKEUP_GPIO:
+            return alarm_pin_pinalarm_get_wakeup_alarm(n_alarms, alarms);
-    //     case ESP_SLEEP_WAKEUP_EXT0:
+        }
-    //     case ESP_SLEEP_WAKEUP_EXT1: {
+        case STM_WAKEUP_UNDEF:
-    //         return alarm_pin_pinalarm_get_wakeup_alarm(n_alarms, alarms);
+        default:
-    //     }
+            // Not a deep sleep reset.
-
+            break;
-    //     case ESP_SLEEP_WAKEUP_TOUCHPAD: {
+    }
-    //         return alarm_touch_touchalarm_get_wakeup_alarm(n_alarms, alarms);
-    //     }
-
-    //     case ESP_SLEEP_WAKEUP_UNDEFINED:
-    //     default:
-    //         // Not a deep sleep reset.
-    //         break;
-    // }
-    // return mp_const_none;
     return mp_const_none;
 }
 
 mp_obj_t common_hal_alarm_get_wake_alarm(void) {
-    //return _get_wake_alarm(0, NULL);
+    return _get_wake_alarm(0, NULL);
-    return mp_const_none;
 }
 
 // Set up light sleep or deep sleep alarms.
 STATIC void _setup_sleep_alarms(bool deep_sleep, size_t n_alarms, const mp_obj_t *alarms) {
     alarm_pin_pinalarm_set_alarms(deep_sleep, n_alarms, alarms);
     alarm_time_timealarm_set_alarms(deep_sleep, n_alarms, alarms);
-    // alarm_touch_touchalarm_set_alarm(deep_sleep, n_alarms, alarms);
 }
 
 STATIC void _idle_until_alarm(void) {
@@ -144,16 +147,19 @@ void NORETURN common_hal_alarm_enter_deep_sleep(void) {
     HAL_GPIO_WritePin(GPIOB,GPIO_PIN_9,1);
     HAL_GPIO_WritePin(GPIOB,GPIO_PIN_9,0);
     alarm_pin_pinalarm_prepare_for_deep_sleep();
+    alarm_time_timealarm_prepare_for_deep_sleep();
     port_disable_tick();
     __HAL_PWR_CLEAR_FLAG(PWR_FLAG_WU);
-    // alarm_touch_touchalarm_prepare_for_deep_sleep();
+
+    // Set a flag in the backup registers to indicate sleep wakeup
+    STM_ALARM_FLAG = 0x01;
     // HAL_PWR_EnableBkUpAccess();
     // __HAL_RCC_BACKUPRESET_FORCE();
     // __HAL_RCC_BACKUPRESET_RELEASE();
 
     HAL_PWR_EnterSTANDBYMode();
 
-    // Should never hit this
+    // The above shuts down RAM, so we should never hit this
     while(1);
 }
 

ports/stm/common-hal/alarm/pin/PinAlarm.c

@@ -109,6 +109,7 @@ mp_obj_t alarm_pin_pinalarm_get_wakeup_alarm(size_t n_alarms, const mp_obj_t *al
 }
 
 void alarm_pin_pinalarm_reset(void) {
+    HAL_PWR_DisableWakeUpPin(PWR_WAKEUP_PIN1);
     alarm_pin_triggered = 0;
     woke_up = false;
 }
@@ -118,20 +119,18 @@ void alarm_pin_pinalarm_set_alarms(bool deep_sleep, size_t n_alarms, const mp_ob
     for (size_t i = 0; i < n_alarms; i++) {
         if (MP_OBJ_IS_TYPE(alarms[i], &alarm_pin_pinalarm_type)) {
             alarm_pin_pinalarm_obj_t *alarm  = MP_OBJ_TO_PTR(alarms[i]);
-
             if (deep_sleep) {
                 // Deep sleep only wakes on a rising edge from one pin, WKUP (PA00)
+                // All pin settings are handled automatically.
                 if (alarm->pin != &pin_PA00) {
                     mp_raise_ValueError(translate("Only the WKUP pin can be used to wake from Deep Sleep"));
                 }
-                HAL_PWR_DisableWakeUpPin(PWR_WAKEUP_PIN1);
+                // We can't actually turn WakeUp on here, since enabling it disables EXTI,
-                __HAL_PWR_CLEAR_FLAG(PWR_FLAG_WU);
+                // so we put it off until right before sleeping.
-                HAL_PWR_EnableWakeUpPin(PWR_WAKEUP_PIN1);
-
                 deep_wkup_enabled = true;
-            } else {
-                stm_peripherals_exti_enable(alarm->pin->number);
             }
+
+            stm_peripherals_exti_enable(alarm->pin->number);
         }
     }
 }
@@ -150,7 +149,9 @@ void alarm_pin_pinalarm_reset_alarms(bool deep_sleep, size_t n_alarms, const mp_
 // If we don't have WKUP enabled, ensure it's disabled
 // TODO; is this really required?
 void alarm_pin_pinalarm_prepare_for_deep_sleep(void) {
-    if (!deep_wkup_enabled) {
+    if (deep_wkup_enabled) {
         HAL_PWR_DisableWakeUpPin(PWR_WAKEUP_PIN1);
+        __HAL_PWR_CLEAR_FLAG(PWR_FLAG_WU);
+        HAL_PWR_EnableWakeUpPin(PWR_WAKEUP_PIN1);
     }
 }

ports/stm/common-hal/alarm/time/TimeAlarm.c

@@ -34,6 +34,7 @@
 #include STM32_HAL_H
 
 STATIC volatile bool woke_up;
+STATIC uint32_t deep_sleep_ticks;
 
 void common_hal_alarm_time_timealarm_construct(alarm_time_timealarm_obj_t *self, mp_float_t monotonic_time) {
     self->monotonic_time = monotonic_time;
@@ -95,7 +96,24 @@ void alarm_time_timealarm_set_alarms(bool deep_sleep, size_t n_alarms, const mp_
     uint32_t wakeup_in_secs = MAX(0.0f, timealarm->monotonic_time - now_secs);
     uint32_t wakeup_in_ticks = wakeup_in_secs * 1024;
 
+    // In the deep sleep case, we can't start the timer until the USB delay has finished
+    if (deep_sleep) {
+        deep_sleep_ticks = wakeup_in_ticks;
+    } else {
+        deep_sleep_ticks = 0;
+    }
     // Use alarm B, since port reserves A
+    // If true deep sleep is called, it will either ignore or overwrite this depending on
+    // whether it is shorter or longer than the USB delay
     stm32_peripherals_rtc_assign_alarm_callback(PERIPHERALS_ALARM_B,timer_callback);
     stm32_peripherals_rtc_set_alarm(PERIPHERALS_ALARM_B,wakeup_in_ticks);
 }
+
+void alarm_time_timealarm_prepare_for_deep_sleep(void) {
+    if (deep_sleep_ticks) {
+        // This is used for both fake and real deep sleep, so it still needs the callback
+        stm32_peripherals_rtc_assign_alarm_callback(PERIPHERALS_ALARM_B,timer_callback);
+        stm32_peripherals_rtc_set_alarm(PERIPHERALS_ALARM_B,deep_sleep_ticks);
+        deep_sleep_ticks = 0;
+    }
+}

ports/stm/common-hal/alarm/time/TimeAlarm.h

@@ -38,3 +38,5 @@ mp_obj_t alarm_time_timealarm_get_wakeup_alarm(size_t n_alarms, const mp_obj_t *
 bool alarm_time_timealarm_woke_us_up(void);
 void alarm_time_timealarm_set_alarms(bool deep_sleep, size_t n_alarms, const mp_obj_t *alarms);
 void alarm_time_timealarm_reset(void);
+
+void alarm_time_timealarm_prepare_for_deep_sleep(void);

ports/stm/supervisor/port.c

@@ -369,3 +369,9 @@ void _init(void)
 {
 
 }
+
+#if CIRCUITPY_ALARM
+// in case boards/xxx/board.c does not provide board_deinit()
+MP_WEAK void board_deinit(void) {
+}
+#endif

shared-bindings/alarm/__init__.c

@@ -92,7 +92,7 @@ void validate_objs_are_alarms(size_t n_args, const mp_obj_t *objs) {
 //|     This allows the user to interrupt an existing program with ctrl-C,
 //|     and to edit the files in CIRCUITPY, which would not be possible in true light sleep.
 //|     Thus, to use light sleep and save significant power,
-//      it may be necessary to disconnect from the host.
+//|     it may be necessary to disconnect from the host.
 //|     """
 //|     ...
 //|