diff --git a/main.c b/main.c
index 8938d714af..f77bf41d84 100755
--- a/main.c
+++ b/main.c
@@ -61,6 +61,8 @@
 #include "supervisor/usb.h"
 
 #include "shared-bindings/microcontroller/__init__.h"
+#include "shared-bindings/microcontroller/Processor.h"
+#include "shared-bindings/supervisor/Runtime.h"
 
 #include "boards/board.h"
 
@@ -327,24 +329,27 @@ bool run_code_py(safe_mode_t safe_mode) {
     #endif
     rgb_status_animation_t animation;
     bool ok = result.return_code != PYEXEC_EXCEPTION;
-    #if CIRCUITPY_ALARM
     // If USB isn't enumerated then deep sleep.
     if (ok && !supervisor_workflow_active() && supervisor_ticks_ms64() > CIRCUITPY_USB_ENUMERATION_DELAY * 1024) {
-        common_hal_alarm_restart_on_alarm(0, NULL);
+        common_hal_mcu_deep_sleep();
     }
-    #endif
     // Show the animation every N seconds.
     prep_rgb_status_animation(&result, found_main, safe_mode, &animation);
     while (true) {
         RUN_BACKGROUND_TASKS;
         if (reload_requested) {
+            supervisor_set_run_reason(RUN_REASON_AUTO_RELOAD);
             reload_requested = false;
             return true;
         }
 
         if (serial_connected() && serial_bytes_available()) {
             // Skip REPL if reload was requested.
-            return (serial_read() == CHAR_CTRL_D);
+            bool ctrl_d = serial_read() == CHAR_CTRL_D;
+            if (ctrl_d) {
+                supervisor_set_run_reason(RUN_REASON_REPL_RELOAD);
+            }
+            return (ctrl_d);
         }
 
         if (!serial_connected_before_animation && serial_connected()) {
@@ -521,6 +526,9 @@ int __attribute__((used)) main(void) {
     reset_devices();
     reset_board();
 
+    // This is first time we are running CircuitPython after a reset or power-up.
+    supervisor_set_run_reason(RUN_REASON_STARTUP);
+
     // If not in safe mode turn on autoreload by default but before boot.py in case it wants to change it.
     if (safe_mode == NO_SAFE_MODE) {
         autoreload_enable();
diff --git a/ports/atmel-samd/common-hal/microcontroller/__init__.c b/ports/atmel-samd/common-hal/microcontroller/__init__.c
index 50a1ec038e..ca39f28386 100644
--- a/ports/atmel-samd/common-hal/microcontroller/__init__.c
+++ b/ports/atmel-samd/common-hal/microcontroller/__init__.c
@@ -84,6 +84,10 @@ void common_hal_mcu_reset(void) {
     reset();
 }
 
+void common_hal_mcu_deep_sleep(void) {
+    //deep sleep call here
+}
+
 // The singleton microcontroller.Processor object, bound to microcontroller.cpu
 // It currently only has properties, and no state.
 const mcu_processor_obj_t common_hal_mcu_processor_obj = {
diff --git a/ports/cxd56/common-hal/microcontroller/__init__.c b/ports/cxd56/common-hal/microcontroller/__init__.c
index 7aa3b839d7..57140dec70 100644
--- a/ports/cxd56/common-hal/microcontroller/__init__.c
+++ b/ports/cxd56/common-hal/microcontroller/__init__.c
@@ -81,6 +81,10 @@ void common_hal_mcu_reset(void) {
     boardctl(BOARDIOC_RESET, 0);
 }
 
+void common_hal_mcu_deep_sleep(void) {
+    //deep sleep call here
+}
+
 STATIC const mp_rom_map_elem_t mcu_pin_globals_table[] = {
     { MP_ROM_QSTR(MP_QSTR_UART2_RXD), MP_ROM_PTR(&pin_UART2_RXD) },
     { MP_ROM_QSTR(MP_QSTR_UART2_TXD), MP_ROM_PTR(&pin_UART2_TXD) },
diff --git a/ports/esp32s2/common-hal/alarm/__init__.c b/ports/esp32s2/common-hal/alarm/__init__.c
index e335345508..4a255c51cc 100644
--- a/ports/esp32s2/common-hal/alarm/__init__.c
+++ b/ports/esp32s2/common-hal/alarm/__init__.c
@@ -25,12 +25,20 @@
  * THE SOFTWARE.
  */
 
+#include "py/objtuple.h"
+
 #include "shared-bindings/alarm/__init__.h"
 #include "shared-bindings/alarm/pin/PinAlarm.h"
 #include "shared-bindings/alarm/time/DurationAlarm.h"
 
 #include "esp_sleep.h"
 
+STATIC mp_obj_tuple_t *_deep_sleep_alarms;
+
+void alarm_reset(void) {
+    _deep_sleep_alarms = &mp_const_empty_tuple;
+}
+
 void common_hal_alarm_disable_all(void) {
     esp_sleep_disable_wakeup_source(ESP_SLEEP_WAKEUP_ALL);
 }
@@ -63,3 +71,38 @@ mp_obj_t common_hal_alarm_get_wake_alarm(void) {
     }
     return mp_const_none;
 }
+
+mp_obj_t common_hal_alarm_sleep_until_alarms(size_t n_alarms, const mp_obj_t *alarms) {
+    mp_raise_NotImplementedError(NULL);
+}
+
+void common_hal_alarm_set_deep_sleep_alarms(size_t n_alarms, const mp_obj_t *alarms) {
+    bool time_alarm_set = false;
+    for (size_t i = 0; i < n_alarms; i++) {
+        if (MP_OBJ_IS_TYPE(alarms[i], &alarm_pin_pin_alarm_type)) {
+            mp_raise_NotImplementedError(translate("PinAlarm deep sleep not yet implemented"));
+        }
+        if (MP_OBJ_IS_TYPE(alarms[i], &alarm_time_duration_alarm_type)) {
+            if (time_alarm_set) {
+                mp_raise_ValueError(translate("Only one alarm.time alarm can be set."));
+            }
+            time_alarm_set = true;
+        }
+    }
+
+    _deep_sleep_alarms = mp_obj_new_tuple(n_alarms, alarms);
+}
+
+void common_hal_deep_sleep_with_alarms(void) {
+    for (size_t i = 0; i < _deep_sleep_alarms.len; i++) {
+        mp_obj_t alarm = _deep_sleep_alarms.items[i]
+        if (MP_OBJ_IS_TYPE(alarm, &alarm_time_duration_alarm_type)) {
+            alarm_time_duration_alarm_obj_t *duration_alarm = MP_OBJ_TO_PTR(alarm);
+            esp_sleep_enable_timer_wakeup(
+                (uint64_t) (duration_alarm->duration * 1000000.0f));
+        }
+        // TODO: handle pin alarms
+    }
+
+    common_hal_mcu_deep_sleep();
+}
diff --git a/ports/esp32s2/common-hal/alarm/pin/PinAlarm.c b/ports/esp32s2/common-hal/alarm/pin/PinAlarm.c
index 6ac3d05f87..f26c8a179a 100644
--- a/ports/esp32s2/common-hal/alarm/pin/PinAlarm.c
+++ b/ports/esp32s2/common-hal/alarm/pin/PinAlarm.c
@@ -30,19 +30,24 @@
 #include "shared-bindings/alarm/pin/PinAlarm.h"
 #include "shared-bindings/microcontroller/Pin.h"
 
-void common_hal_alarm_pin_pin_alarm_construct(alarm_pin_pin_alarm_obj_t *self, const mcu_pin_obj_t *pin, bool level, bool edge, bool pull) {
-    self->pin = pin;
-    self->level = level;
+void common_hal_alarm_pin_pin_alarm_construct(alarm_pin_pin_alarm_obj_t *self, const mp_obj_t pins[], size_t num_pins, bool value, bool all_same_value, bool edge, bool pull) {
+    self->pins = mp_obj_new_tuple(num_pins, pins);
+    self->value = value;
+    self->all_same_value = all_same_value;
     self->edge = edge;
     self->pull = pull;
 }
 
-const mcu_pin_obj_t *common_hal_alarm_pin_pin_alarm_get_pin(alarm_pin_pin_alarm_obj_t *self) {
-    return self->pin;
+const mp_obj_tuple_t *common_hal_alarm_pin_pin_alarm_get_pins(alarm_pin_pin_alarm_obj_t *self) {
+    return self->pins;
 }
 
-bool common_hal_alarm_pin_pin_alarm_get_level(alarm_pin_pin_alarm_obj_t *self) {
-    return self->level;
+bool common_hal_alarm_pin_pin_alarm_get_value(alarm_pin_pin_alarm_obj_t *self) {
+    return self->value;
+}
+
+bool common_hal_alarm_pin_pin_alarm_get_all_same_value(alarm_pin_pin_alarm_obj_t *self) {
+    return self->all_same_value;
 }
 
 bool common_hal_alarm_pin_pin_alarm_get_edge(alarm_pin_pin_alarm_obj_t *self) {
diff --git a/ports/esp32s2/common-hal/alarm/pin/PinAlarm.h b/ports/esp32s2/common-hal/alarm/pin/PinAlarm.h
index c6a760b96a..d7e7e2552a 100644
--- a/ports/esp32s2/common-hal/alarm/pin/PinAlarm.h
+++ b/ports/esp32s2/common-hal/alarm/pin/PinAlarm.h
@@ -24,13 +24,14 @@
  * THE SOFTWARE.
  */
 
-
 #include "py/obj.h"
+#include "py/objtuple.h"
 
 typedef struct {
     mp_obj_base_t base;
-    const mcu_pin_obj_t *pin;
-    bool level;
+    mp_obj_tuple_t *pins;
+    bool value;
+    bool all_same_value;
     bool edge;
     bool pull;
 } alarm_pin_pin_alarm_obj_t;
diff --git a/ports/esp32s2/common-hal/microcontroller/Processor.c b/ports/esp32s2/common-hal/microcontroller/Processor.c
index bd625dc6e2..fffd1a1b19 100644
--- a/ports/esp32s2/common-hal/microcontroller/Processor.c
+++ b/ports/esp32s2/common-hal/microcontroller/Processor.c
@@ -31,8 +31,12 @@
 #include "py/runtime.h"
 
 #include "common-hal/microcontroller/Processor.h"
+#include "shared-bindings/microcontroller/ResetReason.h"
 #include "supervisor/shared/translate.h"
 
+#include "esp_sleep.h"
+#include "esp_system.h"
+
 #include "soc/efuse_reg.h"
 
 #include "components/driver/esp32s2/include/driver/temp_sensor.h"
@@ -77,21 +81,42 @@ void common_hal_mcu_processor_get_uid(uint8_t raw_id[]) {
 }
 
 mcu_reset_reason_t common_hal_mcu_processor_get_reset_reason(void) {
-    switch (esp_sleep_get_wakeup_cause()) {
-        case ESP_SLEEP_WAKEUP_TIMER:
-            return RESET_REASON_DEEP_SLEEP_ALARM;
+    switch (esp_reset_reason()) {
+        case ESP_RST_POWERON:
+            return RESET_REASON_POWER_ON;
 
-        case ESP_SLEEP_WAKEUP_EXT0:
-            return RESET_REASON_DEEP_SLEEP_ALARM;
+        case ESP_RST_SW:
+        case ESP_RST_PANIC:
+            return RESET_REASON_SOFTWARE;
 
-        case ESP_SLEEP_WAKEUP_TOUCHPAD:
-            //TODO: implement TouchIO
-        case ESP_SLEEP_WAKEUP_UNDEFINED:
+        case ESP_RST_INT_WDT:
+        case ESP_RST_TASK_WDT:
+        case ESP_RST_WDT:
+            return RESET_REASON_WATCHDOG;
+
+        case ESP_RST_BROWNOUT:
+            return RESET_REASON_BROWNOUT;
+
+        case ESP_RST_SDIO:
+        case ESP_RST_EXT:
+            return RESET_REASON_RESET_PIN;
+
+        case ESP_RST_DEEPSLEEP:
+            switch (esp_sleep_get_wakeup_cause()) {
+                case ESP_SLEEP_WAKEUP_TIMER:
+                case ESP_SLEEP_WAKEUP_EXT0:
+                case ESP_SLEEP_WAKEUP_EXT1:
+                case ESP_SLEEP_WAKEUP_TOUCHPAD:
+                    return RESET_REASON_DEEP_SLEEP_ALARM;
+
+                case ESP_SLEEP_WAKEUP_UNDEFINED:
+                default:
+                    return RESET_REASON_UNKNOWN;
+            }
+
+        case ESP_RST_UNKNOWN:
         default:
-            return RESET_REASON_POWER_APPLIED;
+            return RESET_REASON_UNKNOWN;
+
     }
 }
-
-mcu_reset_reason_t common_hal_mcu_processor_get_reset_reason(void) {
-    return RESET_REASON_POWER_ON;
-}
diff --git a/ports/esp32s2/common-hal/microcontroller/Processor.h b/ports/esp32s2/common-hal/microcontroller/Processor.h
index f6636b333c..641a11d555 100644
--- a/ports/esp32s2/common-hal/microcontroller/Processor.h
+++ b/ports/esp32s2/common-hal/microcontroller/Processor.h
@@ -24,8 +24,8 @@
  * THE SOFTWARE.
  */
 
-#ifndef MICROPY_INCLUDED_LITEX_COMMON_HAL_MICROCONTROLLER_PROCESSOR_H
-#define MICROPY_INCLUDED_LITEX_COMMON_HAL_MICROCONTROLLER_PROCESSOR_H
+#ifndef MICROPY_INCLUDED_ESP32S2_COMMON_HAL_MICROCONTROLLER_PROCESSOR_H
+#define MICROPY_INCLUDED_ESP32S2_COMMON_HAL_MICROCONTROLLER_PROCESSOR_H
 
 #define COMMON_HAL_MCU_PROCESSOR_UID_LENGTH 6
 
@@ -36,4 +36,4 @@ typedef struct {
     // Stores no state currently.
 } mcu_processor_obj_t;
 
-#endif // MICROPY_INCLUDED_LITEX_COMMON_HAL_MICROCONTROLLER_PROCESSOR_H
+#endif // MICROPY_INCLUDED_ESP32S2_COMMON_HAL_MICROCONTROLLER_PROCESSOR_H
diff --git a/ports/esp32s2/common-hal/microcontroller/__init__.c b/ports/esp32s2/common-hal/microcontroller/__init__.c
index 3056c65655..fdfbd65fad 100644
--- a/ports/esp32s2/common-hal/microcontroller/__init__.c
+++ b/ports/esp32s2/common-hal/microcontroller/__init__.c
@@ -79,6 +79,14 @@ void common_hal_mcu_reset(void) {
     while(1);
 }
 
+void common_hal_mcu_deep_sleep(void) {
+    // Shut down wifi cleanly.
+    esp_wifi_stop();
+
+    // Does not return.
+    esp_deep_sleep_start();
+}
+
 // The singleton microcontroller.Processor object, bound to microcontroller.cpu
 // It currently only has properties, and no state.
 const mcu_processor_obj_t common_hal_mcu_processor_obj = {
diff --git a/ports/esp32s2/common-hal/rtc/RTC.h b/ports/esp32s2/common-hal/rtc/RTC.h
index e51f1f7848..233cde3fd2 100644
--- a/ports/esp32s2/common-hal/rtc/RTC.h
+++ b/ports/esp32s2/common-hal/rtc/RTC.h
@@ -24,11 +24,11 @@
  * THE SOFTWARE.
  */
 
-#ifndef MICROPY_INCLUDED_NRF_COMMON_HAL_RTC_RTC_H
-#define MICROPY_INCLUDED_NRF_COMMON_HAL_RTC_RTC_H
+#ifndef MICROPY_INCLUDED_ESP32S2_COMMON_HAL_RTC_RTC_H
+#define MICROPY_INCLUDED_ESP32S2_COMMON_HAL_RTC_RTC_H
 
 extern void rtc_init(void);
 extern void rtc_reset(void);
 extern void common_hal_rtc_init(void);
 
-#endif  // MICROPY_INCLUDED_NRF_COMMON_HAL_RTC_RTC_H
+#endif  // MICROPY_INCLUDED_ESP32S2_COMMON_HAL_RTC_RTC_H
diff --git a/ports/esp32s2/common-hal/supervisor/Runtime.h b/ports/esp32s2/common-hal/supervisor/Runtime.h
index d1fe246211..840ce1bbb3 100644
--- a/ports/esp32s2/common-hal/supervisor/Runtime.h
+++ b/ports/esp32s2/common-hal/supervisor/Runtime.h
@@ -24,8 +24,8 @@
  * THE SOFTWARE.
  */
 
-#ifndef MICROPY_INCLUDED_LITEX_COMMON_HAL_SUPERVISOR_RUNTIME_H
-#define MICROPY_INCLUDED_LITEX_COMMON_HAL_SUPERVISOR_RUNTIME_H
+#ifndef MICROPY_INCLUDED_ESP32S2_COMMON_HAL_SUPERVISOR_RUNTIME_H
+#define MICROPY_INCLUDED_ESP32S2_COMMON_HAL_SUPERVISOR_RUNTIME_H
 
 #include "py/obj.h"
 
@@ -34,4 +34,4 @@ typedef struct {
     // Stores no state currently.
 } super_runtime_obj_t;
 
-#endif // MICROPY_INCLUDED_LITEX_COMMON_HAL_SUPERVISOR_RUNTIME_H
+#endif // MICROPY_INCLUDED_ESP32S2_COMMON_HAL_SUPERVISOR_RUNTIME_H
diff --git a/ports/esp32s2/supervisor/internal_flash_root_pointers.h b/ports/esp32s2/supervisor/internal_flash_root_pointers.h
index ae3e45e14c..a9a8c2a22e 100644
--- a/ports/esp32s2/supervisor/internal_flash_root_pointers.h
+++ b/ports/esp32s2/supervisor/internal_flash_root_pointers.h
@@ -23,9 +23,9 @@
  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  * THE SOFTWARE.
  */
-#ifndef MICROPY_INCLUDED_LITEX_INTERNAL_FLASH_ROOT_POINTERS_H
-#define MICROPY_INCLUDED_LITEX_INTERNAL_FLASH_ROOT_POINTERS_H
+#ifndef MICROPY_INCLUDED_ESP32S2_INTERNAL_FLASH_ROOT_POINTERS_H
+#define MICROPY_INCLUDED_ESP32S2_INTERNAL_FLASH_ROOT_POINTERS_H
 
 #define FLASH_ROOT_POINTERS
 
-#endif  // MICROPY_INCLUDED_LITEX_INTERNAL_FLASH_ROOT_POINTERS_H
+#endif  // MICROPY_INCLUDED_ESP32S2_INTERNAL_FLASH_ROOT_POINTERS_H
diff --git a/ports/litex/common-hal/microcontroller/__init__.c b/ports/litex/common-hal/microcontroller/__init__.c
index 3c91661144..e6f50ed5a6 100644
--- a/ports/litex/common-hal/microcontroller/__init__.c
+++ b/ports/litex/common-hal/microcontroller/__init__.c
@@ -89,6 +89,10 @@ void common_hal_mcu_reset(void) {
     while(1);
 }
 
+void common_hal_mcu_deep_sleep(void) {
+    //deep sleep call here
+}
+
 // The singleton microcontroller.Processor object, bound to microcontroller.cpu
 // It currently only has properties, and no state.
 const mcu_processor_obj_t common_hal_mcu_processor_obj = {
diff --git a/ports/mimxrt10xx/common-hal/microcontroller/__init__.c b/ports/mimxrt10xx/common-hal/microcontroller/__init__.c
index 6a8537e2da..0329ced69b 100644
--- a/ports/mimxrt10xx/common-hal/microcontroller/__init__.c
+++ b/ports/mimxrt10xx/common-hal/microcontroller/__init__.c
@@ -86,6 +86,10 @@ void common_hal_mcu_reset(void) {
     NVIC_SystemReset();
 }
 
+void common_hal_mcu_deep_sleep(void) {
+    //deep sleep call here
+}
+
 // The singleton microcontroller.Processor object, bound to microcontroller.cpu
 // It currently only has properties, and no state.
 const mcu_processor_obj_t common_hal_mcu_processor_obj = {
diff --git a/ports/mimxrt10xx/peripherals/mimxrt10xx/MIMXRT1011/periph.h b/ports/mimxrt10xx/peripherals/mimxrt10xx/MIMXRT1011/periph.h
index c3f04a0490..c50d73294b 100644
--- a/ports/mimxrt10xx/peripherals/mimxrt10xx/MIMXRT1011/periph.h
+++ b/ports/mimxrt10xx/peripherals/mimxrt10xx/MIMXRT1011/periph.h
@@ -24,8 +24,8 @@
  * THE SOFTWARE.
  */
 
-#ifndef MICROPY_INCLUDED_MIMXRT10XX_PERIPHERALS_MIMXRT1011_PERIPH_H
-#define MICROPY_INCLUDED_MIMXRT10XX_PERIPHERALS_MIMXRT1011_PERIPH_H
+#ifndef MICROPY_INCLUDED_MIMXRT10XX_MIMXRT1011_PERIPHERALS_MIMXRT1011_PERIPH_H
+#define MICROPY_INCLUDED_MIMXRT10XX_MIMXRT1011_PERIPHERALS_MIMXRT1011_PERIPH_H
 
 extern LPI2C_Type *mcu_i2c_banks[2];
 
@@ -47,4 +47,4 @@ extern const mcu_periph_obj_t mcu_uart_cts_list[4];
 
 extern const mcu_pwm_obj_t mcu_pwm_list[20];
 
-#endif // MICROPY_INCLUDED_MIMXRT10XX_PERIPHERALS_MIMXRT1011_PERIP_H
+#endif // MICROPY_INCLUDED_MIMXRT10XX_MIMXRT1011_PERIPHERALS_MIMXRT1011_PERIPH_H
diff --git a/ports/mimxrt10xx/peripherals/mimxrt10xx/MIMXRT1062/periph.h b/ports/mimxrt10xx/peripherals/mimxrt10xx/MIMXRT1062/periph.h
index 4f6ab6261e..067c05d0d0 100644
--- a/ports/mimxrt10xx/peripherals/mimxrt10xx/MIMXRT1062/periph.h
+++ b/ports/mimxrt10xx/peripherals/mimxrt10xx/MIMXRT1062/periph.h
@@ -24,8 +24,8 @@
  * THE SOFTWARE.
  */
 
-#ifndef MICROPY_INCLUDED_MIMXRT10XX_PERIPHERALS_MIMXRT1011_PERIPH_H
-#define MICROPY_INCLUDED_MIMXRT10XX_PERIPHERALS_MIMXRT1011_PERIPH_H
+#ifndef MICROPY_INCLUDED_MIMXRT10XX_MIMXRT1062_PERIPHERALS_MIMXRT1011_PERIPH_H
+#define MICROPY_INCLUDED_MIMXRT10XX_MIMXRT1062_PERIPHERALS_MIMXRT1011_PERIPH_H
 
 extern LPI2C_Type *mcu_i2c_banks[4];
 
@@ -47,4 +47,4 @@ extern const mcu_periph_obj_t mcu_uart_cts_list[9];
 
 extern const mcu_pwm_obj_t mcu_pwm_list[67];
 
-#endif // MICROPY_INCLUDED_MIMXRT10XX_PERIPHERALS_MIMXRT1011_PERIPH_H
+#endif // MICROPY_INCLUDED_MIMXRT10XX_MIMXRT1062_PERIPHERALS_MIMXRT1011_PERIPH_H
diff --git a/ports/nrf/common-hal/microcontroller/__init__.c b/ports/nrf/common-hal/microcontroller/__init__.c
index 06aac9409d..9911896bff 100644
--- a/ports/nrf/common-hal/microcontroller/__init__.c
+++ b/ports/nrf/common-hal/microcontroller/__init__.c
@@ -95,6 +95,10 @@ void common_hal_mcu_reset(void) {
     reset_cpu();
 }
 
+void common_hal_mcu_deep_sleep(void) {
+    //deep sleep call here
+}
+
 // The singleton microcontroller.Processor object, bound to microcontroller.cpu
 // It currently only has properties, and no state.
 const mcu_processor_obj_t common_hal_mcu_processor_obj = {
diff --git a/ports/nrf/common-hal/rgbmatrix/RGBMatrix.h b/ports/nrf/common-hal/rgbmatrix/RGBMatrix.h
index 48de4dcb21..24d86f1779 100644
--- a/ports/nrf/common-hal/rgbmatrix/RGBMatrix.h
+++ b/ports/nrf/common-hal/rgbmatrix/RGBMatrix.h
@@ -24,8 +24,8 @@
  * THE SOFTWARE.
  */
 
-#ifndef MICROPY_INCLUDED_ATMEL_SAMD_COMMON_HAL_RGBMATRIX_RGBMATRIX_H
-#define MICROPY_INCLUDED_ATMEL_SAMD_COMMON_HAL_RGBMATRIX_RGBMATRIX_H
+#ifndef MICROPY_INCLUDED_NRF_COMMON_HAL_RGBMATRIX_RGBMATRIX_H
+#define MICROPY_INCLUDED_NRF_COMMON_HAL_RGBMATRIX_RGBMATRIX_H
 
 void *common_hal_rgbmatrix_timer_allocate(void);
 void common_hal_rgbmatrix_timer_enable(void*);
diff --git a/ports/stm/common-hal/microcontroller/__init__.c b/ports/stm/common-hal/microcontroller/__init__.c
index a827399ccb..bc81b0e4f5 100644
--- a/ports/stm/common-hal/microcontroller/__init__.c
+++ b/ports/stm/common-hal/microcontroller/__init__.c
@@ -81,6 +81,10 @@ void common_hal_mcu_reset(void) {
     NVIC_SystemReset();
 }
 
+void common_hal_mcu_deep_sleep(void) {
+    //deep sleep call here
+}
+
 // The singleton microcontroller.Processor object, bound to microcontroller.cpu
 // It currently only has properties, and no state.
 const mcu_processor_obj_t common_hal_mcu_processor_obj = {
diff --git a/ports/stm/common-hal/rgbmatrix/RGBMatrix.h b/ports/stm/common-hal/rgbmatrix/RGBMatrix.h
index 48de4dcb21..323878d202 100644
--- a/ports/stm/common-hal/rgbmatrix/RGBMatrix.h
+++ b/ports/stm/common-hal/rgbmatrix/RGBMatrix.h
@@ -24,8 +24,8 @@
  * THE SOFTWARE.
  */
 
-#ifndef MICROPY_INCLUDED_ATMEL_SAMD_COMMON_HAL_RGBMATRIX_RGBMATRIX_H
-#define MICROPY_INCLUDED_ATMEL_SAMD_COMMON_HAL_RGBMATRIX_RGBMATRIX_H
+#ifndef MICROPY_INCLUDED_STM_COMMON_HAL_RGBMATRIX_RGBMATRIX_H
+#define MICROPY_INCLUDED_STM_COMMON_HAL_RGBMATRIX_RGBMATRIX_H
 
 void *common_hal_rgbmatrix_timer_allocate(void);
 void common_hal_rgbmatrix_timer_enable(void*);
diff --git a/shared-bindings/alarm/__init__.c b/shared-bindings/alarm/__init__.c
index 9345442164..22b2e7f6ab 100644
--- a/shared-bindings/alarm/__init__.c
+++ b/shared-bindings/alarm/__init__.c
@@ -28,7 +28,6 @@
 #include "py/runtime.h"
 
 #include "shared-bindings/alarm/__init__.h"
-#include "shared-bindings/alarm/ResetReason.h"
 #include "shared-bindings/alarm/pin/PinAlarm.h"
 #include "shared-bindings/alarm/time/DurationAlarm.h"
 
@@ -44,42 +43,61 @@
 //|
 //| Deep sleep shuts down power to nearly all of the chip including the CPU and RAM. This can save
 //| a more significant amount of power, but CircuitPython must start ``code.py`` from the beginning when woken
-//| up. CircuitPython will enter deep sleep automatically when the current program exits without error
-//| or calls ``sys.exit(0)``.
-//| If an error causes CircuitPython to exit, error LED error flashes will be done periodically.
-//| An error includes an uncaught exception, or sys.exit called with a non-zero argumetn.
+//| up. If the board is not actively connected to a host computer (usually via USB),
+//| CircuitPython will enter deep sleep automatically when the current program finishes its last statement
+//| or calls ``sys.exit()``.
+//| If the board is connected, the board will not enter deep sleep unless `supervisor.exit_and_deep_sleep()`
+//| is called explicitly.
+//|
+//| An error includes an uncaught exception, or sys.exit() called with a non-zero argument
+//|
 //| To set alarms for deep sleep use `alarm.restart_on_alarm()` they will apply to next deep sleep only."""
 //|
 //| wake_alarm: Alarm
 //| """The most recent alarm to wake us up from a sleep (light or deep.)"""
 //|
 
-//| def sleep_until_alarm(*alarms: Alarm) -> Alarm:
-//|     """Performs a light sleep until woken by one of the alarms. The alarm that triggers the wake
+void validate_objs_are_alarms(size_t n_args, const mp_obj_t *objs) {
+    for (size_t i = 0; i < n_args; i++) {
+        if (MP_OBJ_IS_TYPE(objs[i], &alarm_pin_pin_alarm_type) ||
+            MP_OBJ_IS_TYPE(objs[i], &alarm_time_duration_alarm_type)) {
+            continue;
+        }
+        mp_raise_TypeError_varg(translate("Expected an alarm"));
+    }
+}
+
+//| def sleep_until_alarms(*alarms: Alarm) -> Alarm:
+//|     """Performs a light sleep until woken by one of the alarms. The alarm caused the wake-up
 //|        is returned, and is also available as `alarm.wake_alarm`
 //|     """
 //|     ...
 //|
-STATIC mp_obj_t alarm_sleep_until_alarm(size_t n_args, const mp_obj_t *args) {
-    // TODO
-    common_hal_alarm_sleep_until_alarm(size_t n_args, const mp_obj_t *args);
+STATIC mp_obj_t alarm_sleep_until_alarms(size_t n_args, const mp_obj_t *args) {
+    validate_objs_are_alarms(n_args, args);
+    common_hal_alarm_sleep_until_alarms(n_args, args);
     return mp_const_none;
 }
-MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(alarm_sleep_until_alarm_obj, 1, MP_OBJ_FUN_ARGS_MAX, alarm_sleep_until_alarm);
+MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(alarm_sleep_until_alarms_obj, 1, MP_OBJ_FUN_ARGS_MAX, alarm_sleep_until_alarms);
 
-//| def restart_on_alarm(*alarms: Alarm) -> None:
+//| def set_deep_sleep_alarms(*alarms: Alarm) -> None:
 //|     """Set one or more alarms to wake up from a deep sleep.
-//|     When awakened, ``code.py`` will restart from the beginning.
-//|     The last alarm to wake us up is available as `alarm.wake_alarm`.
+//|
+//|     When awakened, the microcontroller will restart and run ``boot.py`` and ``code.py``
+//|     from the beginning.
+//|
+//|     The alarm that caused the wake-up is available as `alarm.wake_alarm`.
+//|
+//|     If you call this routine more than once, only the last set of alarms given will be used.
 //|     """
 //|     ...
 //|
-STATIC mp_obj_t alarm_restart_on_alarm(size_t n_args, const mp_obj_t *args) {
-    // TODO
-    common_hal_alarm_restart_on_alarm(size_t n_args, const mp_obj_t *args);
+STATIC mp_obj_t alarm_set_deep_sleep_alarms(size_t n_args, const mp_obj_t *args) {
+    validate_objs_are_alarms(n_args, args);
+    common_hal_alarm_set_deep_sleep_alarms(n_args, args);
     return mp_const_none;
 }
-MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(alarm_restart_on_alarm_obj, 1, MP_OBJ_FUN_ARGS_MAX, alarm_restart_on_alarm);
+MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(alarm_set_deep_sleep_alarms_obj, 1, MP_OBJ_FUN_ARGS_MAX, alarm_set_deep_sleep_alarms);
 
 //| """The `alarm.pin` module contains alarm attributes and classes related to pins.
 //| """
@@ -116,11 +134,11 @@ STATIC const mp_obj_module_t alarm_time_module = {
 STATIC mp_map_elem_t alarm_module_globals_table[] = {
     { MP_ROM_QSTR(MP_QSTR___name__), MP_ROM_QSTR(MP_QSTR_alarm) },
 
-    // wake_alarm and reset_reason are mutable attributes.
+    // wake_alarm is a mutable attribute.
     { MP_ROM_QSTR(MP_QSTR_wake_alarm), mp_const_none },
 
-    { MP_ROM_QSTR(MP_QSTR_sleep_until_alarm), MP_OBJ_FROM_PTR(&alarm_sleep_until_alarm_obj) },
-    { MP_ROM_QSTR(MP_QSTR_restart_on_alarm), MP_OBJ_FROM_PTR(&alarm_restart_on_alarm_obj) },
+    { MP_ROM_QSTR(MP_QSTR_sleep_until_alarms), MP_OBJ_FROM_PTR(&alarm_sleep_until_alarms_obj) },
+    { MP_ROM_QSTR(MP_QSTR_set_deep_sleep_alarms), MP_OBJ_FROM_PTR(&alarm_set_deep_sleep_alarms_obj) },
 
     { MP_ROM_QSTR(MP_QSTR_pin), MP_OBJ_FROM_PTR(&alarm_pin_module) },
     { MP_ROM_QSTR(MP_QSTR_time), MP_OBJ_FROM_PTR(&alarm_time_module) }
diff --git a/shared-bindings/alarm/__init__.h b/shared-bindings/alarm/__init__.h
index 29be8716c5..4df12175d4 100644
--- a/shared-bindings/alarm/__init__.h
+++ b/shared-bindings/alarm/__init__.h
@@ -29,9 +29,10 @@
 
 #include "py/obj.h"
 
+extern mp_obj_t common_hal_alarm_sleep_until_alarms(size_t n_alarms, const mp_obj_t *alarms);
+extern mp_obj_t common_hal_alarm_set_deep_sleep_alarms(size_t n_alarms, const mp_obj_t *alarms);
+
+// Used by wake-up code.
 extern void common_hal_alarm_set_wake_alarm(mp_obj_t alarm);
 
-extern mp_obj_t common_hal_alarm_restart_on_alarm(size_t n_alarms, const mp_obj_t *alarms);
-extern mp_obj_t alarm_sleep_until_alarm(size_t n_alarms, const mp_obj_t *alarms);
-
 #endif  // MICROPY_INCLUDED_SHARED_BINDINGS_ALARM___INIT___H
diff --git a/shared-bindings/alarm/pin/PinAlarm.c b/shared-bindings/alarm/pin/PinAlarm.c
index 835a5be5ce..a2d2e0ab7a 100644
--- a/shared-bindings/alarm/pin/PinAlarm.c
+++ b/shared-bindings/alarm/pin/PinAlarm.c
@@ -37,23 +37,25 @@
 //| class PinAlarm:
 //|     """Trigger an alarm when a pin changes state."""
 //|
-//|     def __init__(self, pin: microcontroller.Pin, level: bool, *, edge: bool = False, pull: bool = False) -> None:
+//|     def __init__(self, *pins: microcontroller.Pin, value: bool, all_same_value: bool = False, edge: bool = False, pull: bool = False) -> None:
 //|         """Create an alarm triggered by a `~microcontroller.Pin` level. The alarm is not active
 //|         until it is listed in an `alarm`-enabling function, such as `alarm.sleep_until_alarm()` or
 //|         `alarm.restart_on_alarm()`.
 //|
-//|         :param ~microcontroller.Pin pin: The pin to monitor. On some ports, the choice of pin
+//|         :param pins: The pins to monitor. On some ports, the choice of pins
 //|         may be limited due to hardware restrictions, particularly for deep-sleep alarms.
-//|         :param bool level: When active, trigger when the level is high (``True``) or low (``False``).
-//|         On some ports, multiple `PinAlarm` objects may need to have coordinated levels
+//|         :param bool value: When active, trigger when the pin value is high (``True``) or low (``False``).
+//|         On some ports, multiple `PinAlarm` objects may need to have coordinated values
 //|         for deep-sleep alarms.
+//|         :param bool all_same_value: If ``True``, all pins listed must be at `value` to trigger the alarm.
+//|         If ``False``, any one of the pins going to `value` will trigger the alarm.
 //|         :param bool edge: If ``True``, trigger only when there is a transition to the specified
-//|         value of `level`. If ``True``, if the alarm becomes active when the pin level already
-//|         matches `level`, the alarm is not triggered: the pin must transition from ``not level``
-//|         to ``level`` to trigger the alarm. On some ports, edge-triggering may not be available,
+//|         value of `value`. If ``True``, if the alarm becomes active when the pin value already
+//|         matches `value`, the alarm is not triggered: the pin must transition from ``not value``
+//|         to ``value`` to trigger the alarm. On some ports, edge-triggering may not be available,
 //|         particularly for deep-sleep alarms.
-//|         :param bool pull: Enable a pull-up or pull-down which pulls the pin to level opposite
-//|         opposite that of `level`. For instance, if `level` is set to ``True``, setting `pull`
+//|         :param bool pull: Enable a pull-up or pull-down which pulls the pin to value opposite
+//|         opposite that of `value`. For instance, if `value` is set to ``True``, setting `pull`
 //|         to ``True`` will enable a pull-down, to hold the pin low normally until an outside signal
 //|         pulls it high.
 //|         """
@@ -62,51 +64,30 @@
 STATIC mp_obj_t alarm_pin_pin_alarm_make_new(const mp_obj_type_t *type, mp_uint_t n_args, const mp_obj_t *pos_args, mp_map_t *kw_args) {
     alarm_pin_pin_alarm_obj_t *self = m_new_obj(alarm_pin_pin_alarm_obj_t);
     self->base.type = &alarm_pin_pin_alarm_type;
-    enum { ARG_pin, ARG_level, ARG_edge, ARG_pull };
+    enum { ARG_value, ARG_all_same_value, ARG_edge, ARG_pull };
     static const mp_arg_t allowed_args[] = {
-        { MP_QSTR_pin, MP_ARG_REQUIRED | MP_ARG_OBJ },
-        { MP_QSTR_level, MP_ARG_REQUIRED | MP_ARG_BOOL },
+        { MP_QSTR_value, MP_ARG_KW_ONLY | MP_ARG_REQUIRED | MP_ARG_BOOL },
+        { MP_QSTR_all_same_value, MP_ARG_KW_ONLY | MP_ARG_BOOL, {.u_bool = false} },
         { MP_QSTR_edge, MP_ARG_KW_ONLY | MP_ARG_BOOL, {.u_bool = false} },
         { MP_QSTR_pull, MP_ARG_KW_ONLY | MP_ARG_BOOL, {.u_bool = false} },
     };
     mp_arg_val_t args[MP_ARRAY_SIZE(allowed_args)];
-    mp_arg_parse_all(n_args, pos_args, kw_args, MP_ARRAY_SIZE(allowed_args), allowed_args, args);
+    mp_arg_parse_all(0, pos_args, kw_args, MP_ARRAY_SIZE(allowed_args), allowed_args, args);
 
-    const mcu_pin_obj_t* pin = validate_obj_is_free_pin(args[ARG_pin].u_obj);
+    for (size_t i = 0; i < n_args; i ++) {
+        validate_obj_is_free_pin(pos_args[i]);
+    }
 
     common_hal_alarm_pin_pin_alarm_construct(
-        self, pin, args[ARG_level].u_bool, args[ARG_edge].u_bool, args[ARG_pull].u_bool);
+        self, pos_args, n_args,
+        args[ARG_value].u_bool,
+        args[ARG_all_same_value].u_bool,
+        args[ARG_edge].u_bool,
+        args[ARG_pull].u_bool);
 
     return MP_OBJ_FROM_PTR(self);
 }
 
-//|     def __eq__(self, other: object) -> bool:
-//|         """Two PinAlarm objects are equal if their durations are the same if their pin,
-//|         level, edge, and pull attributes are all the same."""
-//|         ...
-//|
-STATIC mp_obj_t alarm_pin_pin_alarm_binary_op(mp_binary_op_t op, mp_obj_t lhs_in, mp_obj_t rhs_in) {
-    switch (op) {
-        case MP_BINARY_OP_EQUAL:
-            if (MP_OBJ_IS_TYPE(rhs_in, &alarm_pin_pin_alarm_type)) {
-                // Pins are singletons, so we can compare them directly.
-                return mp_obj_new_bool(
-                    common_hal_alarm_pin_pin_alarm_get_pin(lhs_in) ==
-                    common_hal_alarm_pin_pin_alarm_get_pin(rhs_in) &&
-                    common_hal_alarm_pin_pin_alarm_get_level(lhs_in) ==
-                    common_hal_alarm_pin_pin_alarm_get_level(rhs_in) &&
-                    common_hal_alarm_pin_pin_alarm_get_edge(lhs_in) ==
-                    common_hal_alarm_pin_pin_alarm_get_edge(rhs_in) &&
-                    common_hal_alarm_pin_pin_alarm_get_pull(lhs_in) ==
-                    common_hal_alarm_pin_pin_alarm_get_pull(rhs_in));
-            }
-            return mp_const_false;
-
-        default:
-            return MP_OBJ_NULL; // op not supported
-    }
-}
-
 STATIC const mp_rom_map_elem_t alarm_pin_pin_alarm_locals_dict_table[] = {
 };
 
@@ -116,6 +97,5 @@ const mp_obj_type_t alarm_pin_pin_alarm_type = {
     { &mp_type_type },
     .name = MP_QSTR_PinAlarm,
     .make_new = alarm_pin_pin_alarm_make_new,
-    .binary_op = alarm_pin_pin_alarm_binary_op,
     .locals_dict = (mp_obj_t)&alarm_pin_pin_alarm_locals_dict,
 };
diff --git a/shared-bindings/alarm/pin/PinAlarm.h b/shared-bindings/alarm/pin/PinAlarm.h
index 978ceaad56..bbf3018b5d 100644
--- a/shared-bindings/alarm/pin/PinAlarm.h
+++ b/shared-bindings/alarm/pin/PinAlarm.h
@@ -28,13 +28,14 @@
 #define MICROPY_INCLUDED_SHARED_BINDINGS_ALARM_PIN_PIN_ALARM_H
 
 #include "py/obj.h"
+#include "py/objtuple.h"
 #include "common-hal/microcontroller/Pin.h"
 #include "common-hal/alarm/pin/PinAlarm.h"
 
 extern const mp_obj_type_t alarm_pin_pin_alarm_type;
 
-extern void common_hal_alarm_pin_pin_alarm_construct(alarm_pin_pin_alarm_obj_t *self, const mcu_pin_obj_t *pin, bool level, bool edge, bool pull);
-extern const mcu_pin_obj_t *common_hal_alarm_pin_pin_alarm_get_pin(alarm_pin_pin_alarm_obj_t *self);
+void common_hal_alarm_pin_pin_alarm_construct(alarm_pin_pin_alarm_obj_t *self, const mp_obj_t pins[], size_t num_pins, bool value, bool all_same_value, bool edge, bool pull);
+extern const mp_obj_tuple_t *common_hal_alarm_pin_pin_alarm_get_pins(alarm_pin_pin_alarm_obj_t *self);
 extern bool common_hal_alarm_pin_pin_alarm_get_level(alarm_pin_pin_alarm_obj_t *self);
 extern bool common_hal_alarm_pin_pin_alarm_get_edge(alarm_pin_pin_alarm_obj_t *self);
 extern bool common_hal_alarm_pin_pin_alarm_get_pull(alarm_pin_pin_alarm_obj_t *self);
diff --git a/shared-bindings/audiopwmio/__init__.h b/shared-bindings/audiopwmio/__init__.h
index e4b7067d11..d7956d31e6 100644
--- a/shared-bindings/audiopwmio/__init__.h
+++ b/shared-bindings/audiopwmio/__init__.h
@@ -24,11 +24,11 @@
  * THE SOFTWARE.
  */
 
-#ifndef MICROPY_INCLUDED_SHARED_BINDINGS_AUDIOIO___INIT___H
-#define MICROPY_INCLUDED_SHARED_BINDINGS_AUDIOIO___INIT___H
+#ifndef MICROPY_INCLUDED_SHARED_BINDINGS_AUDIOPWMIO___INIT___H
+#define MICROPY_INCLUDED_SHARED_BINDINGS_AUDIOPWMIO___INIT___H
 
 #include "py/obj.h"
 
 // Nothing now.
 
-#endif  // MICROPY_INCLUDED_SHARED_BINDINGS_AUDIOIO___INIT___H
+#endif  // MICROPY_INCLUDED_SHARED_BINDINGS_AUDIOPWMIO___INIT___H
diff --git a/shared-bindings/microcontroller/Processor.c b/shared-bindings/microcontroller/Processor.c
index b0ab842f4c..ea43688213 100644
--- a/shared-bindings/microcontroller/Processor.c
+++ b/shared-bindings/microcontroller/Processor.c
@@ -76,9 +76,9 @@ STATIC mp_obj_t mcu_processor_get_reset_reason(mp_obj_t self) {
 
 MP_DEFINE_CONST_FUN_OBJ_1(mcu_processor_get_reset_reason_obj, mcu_processor_get_reset_reason);
 
-const mp_obj_property_t mcu_reset_reason_obj = {
+const mp_obj_property_t mcu_processor_reset_reason_obj = {
     .base.type = &mp_type_property,
-    .proxy = {(mp_obj_t)&mcu_processor_get_reason_reason_obj,  // getter
+    .proxy = {(mp_obj_t)&mcu_processor_get_reset_reason_obj,  // getter
               (mp_obj_t)&mp_const_none_obj,            // no setter
               (mp_obj_t)&mp_const_none_obj,            // no deleter
     },
diff --git a/shared-bindings/microcontroller/Processor.h b/shared-bindings/microcontroller/Processor.h
index a842e06f32..98d4790876 100644
--- a/shared-bindings/microcontroller/Processor.h
+++ b/shared-bindings/microcontroller/Processor.h
@@ -29,6 +29,7 @@
 
 #include "py/obj.h"
 
+#include "common-hal/microcontroller/Processor.h"
 #include "shared-bindings/microcontroller/ResetReason.h"
 
 extern const mp_obj_type_t mcu_processor_type;
diff --git a/shared-bindings/microcontroller/ResetReason.c b/shared-bindings/microcontroller/ResetReason.c
index 151fcf3159..61891934ae 100644
--- a/shared-bindings/microcontroller/ResetReason.c
+++ b/shared-bindings/microcontroller/ResetReason.c
@@ -35,6 +35,7 @@ MAKE_ENUM_VALUE(mcu_reset_reason_type, reset_reason, SOFTWARE, RESET_REASON_SOFT
 MAKE_ENUM_VALUE(mcu_reset_reason_type, reset_reason, DEEP_SLEEP_ALARM, RESET_REASON_DEEP_SLEEP_ALARM);
 MAKE_ENUM_VALUE(mcu_reset_reason_type, reset_reason, RESET_PIN, RESET_REASON_RESET_PIN);
 MAKE_ENUM_VALUE(mcu_reset_reason_type, reset_reason, WATCHDOG, RESET_REASON_WATCHDOG);
+MAKE_ENUM_VALUE(mcu_reset_reason_type, reset_reason, UNKNOWN, RESET_REASON_UNKNOWN);
 
 //| class ResetReason:
 //|     """The reason the microntroller was last reset"""
@@ -55,7 +56,10 @@ MAKE_ENUM_VALUE(mcu_reset_reason_type, reset_reason, WATCHDOG, RESET_REASON_WATC
 //|     """The microntroller was reset by a signal on its reset pin. The pin might be connected to a reset button."""
 //|
 //|     WATCHDOG: object
-//|     """The chip microcontroller reset by its watchdog timer."""
+//|     """The microcontroller was reset by its watchdog timer."""
+//|
+//|     UNKNOWN: object
+//|     """The microntroller restarted for an unknown reason."""
 //|
 MAKE_ENUM_MAP(mcu_reset_reason) {
     MAKE_ENUM_MAP_ENTRY(reset_reason, POWER_ON),
@@ -64,6 +68,7 @@ MAKE_ENUM_MAP(mcu_reset_reason) {
     MAKE_ENUM_MAP_ENTRY(reset_reason, DEEP_SLEEP_ALARM),
     MAKE_ENUM_MAP_ENTRY(reset_reason, RESET_PIN),
     MAKE_ENUM_MAP_ENTRY(reset_reason, WATCHDOG),
+    MAKE_ENUM_MAP_ENTRY(reset_reason, UNKNOWN),
 };
 STATIC MP_DEFINE_CONST_DICT(mcu_reset_reason_locals_dict, mcu_reset_reason_locals_table);
 
diff --git a/shared-bindings/microcontroller/ResetReason.h b/shared-bindings/microcontroller/ResetReason.h
index df1abf266e..8ed5e48315 100644
--- a/shared-bindings/microcontroller/ResetReason.h
+++ b/shared-bindings/microcontroller/ResetReason.h
@@ -24,8 +24,8 @@
  * THE SOFTWARE.
  */
 
-#ifndef MICROPY_INCLUDED_SHARED_BINDINGS_MCU__RESET_REASON__H
-#define MICROPY_INCLUDED_SHARED_BINDINGS_MCU__RESET_REASON__H
+#ifndef MICROPY_INCLUDED_SHARED_BINDINGS_MCU_RESET_REASON__H
+#define MICROPY_INCLUDED_SHARED_BINDINGS_MCU_RESET_REASON__H
 
 #include "py/obj.h"
 #include "py/enum.h"
@@ -37,15 +37,9 @@ typedef enum {
     RESET_REASON_DEEP_SLEEP_ALARM,
     RESET_REASON_RESET_PIN,
     RESET_REASON_WATCHDOG,
+    RESET_REASON_UNKNOWN,
 } mcu_reset_reason_t;
 
-extern const cp_enum_obj_t reset_reason_POWER_ON_obj;
-extern const cp_enum_obj_t reset_reason_BROWNOUT_obj;
-extern const cp_enum_obj_t reset_reason_SOFTWARE_obj;
-extern const cp_enum_obj_t reset_reason_DEEP_SLEEP_ALARM_obj;
-extern const cp_enum_obj_t reset_reason_RESET_PIN_obj;
-extern const cp_enum_obj_t reset_reason_WATCHDOG_obj;
-
 extern const mp_obj_type_t mcu_reset_reason_type;
 
-#endif // MICROPY_INCLUDED_SHARED_BINDINGS_MCU__RESET_REASON__H
+#endif // MICROPY_INCLUDED_SHARED_BINDINGS_MCU_RESET_REASON__H
diff --git a/shared-bindings/microcontroller/__init__.c b/shared-bindings/microcontroller/__init__.c
index d09cf8f445..d6ce323c58 100644
--- a/shared-bindings/microcontroller/__init__.c
+++ b/shared-bindings/microcontroller/__init__.c
@@ -56,6 +56,19 @@
 //| This object is the sole instance of `microcontroller.Processor`."""
 //|
 
+//| def deep_sleep() -> None:
+//|     Go into deep sleep. If the board is connected via USB, disconnect USB first.
+//|
+//|     The board will awake from deep sleep only if the reset button is pressed
+//|     or it is awoken by an alarm set by `alarm.set_deep_sleep_alarms()`.
+//|     ...
+//|
+STATIC mp_obj_t mcu_deep_sleep(void){
+
+      return mp_const_none;
+}
+MP_DEFINE_CONST_FUN_OBJ_0(mcu_deep_sleep_obj, mcu_deep_sleep);
+
 //| def delay_us(delay: int) -> None:
 //|     """Dedicated delay method used for very short delays. **Do not** do long delays
 //|     because this stops all other functions from completing. Think of this as an empty
@@ -164,6 +177,7 @@ const mp_obj_module_t mcu_pin_module = {
 STATIC const mp_rom_map_elem_t mcu_module_globals_table[] = {
     { MP_ROM_QSTR(MP_QSTR___name__), MP_ROM_QSTR(MP_QSTR_microcontroller) },
     { MP_ROM_QSTR(MP_QSTR_cpu),  MP_ROM_PTR(&common_hal_mcu_processor_obj) },
+    { MP_ROM_QSTR(MP_QSTR_deep_sleep), MP_ROM_PTR(&mcu_deep_sleep_obj) },
     { MP_ROM_QSTR(MP_QSTR_delay_us), MP_ROM_PTR(&mcu_delay_us_obj) },
     { MP_ROM_QSTR(MP_QSTR_disable_interrupts), MP_ROM_PTR(&mcu_disable_interrupts_obj) },
     { MP_ROM_QSTR(MP_QSTR_enable_interrupts), MP_ROM_PTR(&mcu_enable_interrupts_obj) },
diff --git a/shared-bindings/microcontroller/__init__.h b/shared-bindings/microcontroller/__init__.h
index ac71de4247..c6ccccea72 100644
--- a/shared-bindings/microcontroller/__init__.h
+++ b/shared-bindings/microcontroller/__init__.h
@@ -43,6 +43,8 @@ extern void common_hal_mcu_enable_interrupts(void);
 extern void common_hal_mcu_on_next_reset(mcu_runmode_t runmode);
 extern void common_hal_mcu_reset(void);
 
+extern void common_hal_mcu_deep_sleep(void);
+
 extern const mp_obj_dict_t mcu_pin_globals;
 
 extern const mcu_processor_obj_t common_hal_mcu_processor_obj;
diff --git a/shared-bindings/supervisor/RunReason.c b/shared-bindings/supervisor/RunReason.c
index ee08f6d71b..7e7a74d2f4 100644
--- a/shared-bindings/supervisor/RunReason.c
+++ b/shared-bindings/supervisor/RunReason.c
@@ -29,7 +29,7 @@
 #include "shared-bindings/supervisor/RunReason.h"
 
 MAKE_ENUM_VALUE(supervisor_run_reason_type, run_reason, STARTUP, RUN_REASON_STARTUP);
-MAKE_ENUM_VALUE(supervisor_run_reason_type, run_reason, AUTORELOAD, RUN_REASON_AUTORELOAD);
+MAKE_ENUM_VALUE(supervisor_run_reason_type, run_reason, AUTORELOAD, RUN_REASON_AUTO_RELOAD);
 MAKE_ENUM_VALUE(supervisor_run_reason_type, run_reason, SUPERVISOR_RELOAD, RUN_REASON_SUPERVISOR_RELOAD);
 MAKE_ENUM_VALUE(supervisor_run_reason_type, run_reason, REPL_RELOAD, RUN_REASON_REPL_RELOAD);
 
@@ -40,8 +40,8 @@ MAKE_ENUM_VALUE(supervisor_run_reason_type, run_reason, REPL_RELOAD, RUN_REASON_
 //|     """CircuitPython started the microcontroller started up. See `microcontroller.cpu.reset_reason`
 //|        for more detail on why the microcontroller was started."""
 //|
-//|     AUTORELOAD: object
-//|     """CircuitPython restarted due to a USB write to the filesystem."""
+//|     AUTO_RELOAD: object
+//|     """CircuitPython restarted due to an external write to the filesystem."""
 //|
 //|     SUPERVISOR_RELOAD: object
 //|     """CircuitPython restarted due to a call to `supervisor.reload()`."""
@@ -51,7 +51,7 @@ MAKE_ENUM_VALUE(supervisor_run_reason_type, run_reason, REPL_RELOAD, RUN_REASON_
 //|
 MAKE_ENUM_MAP(run_reason) {
     MAKE_ENUM_MAP_ENTRY(run_reason, STARTUP),
-    MAKE_ENUM_MAP_ENTRY(run_reason, AUTORELOAD),
+    MAKE_ENUM_MAP_ENTRY(run_reason, AUTO_RELOAD),
     MAKE_ENUM_MAP_ENTRY(run_reason, SUPERVISOR_RELOAD),
     MAKE_ENUM_MAP_ENTRY(run_reason, REPL_RELOAD),
 };
diff --git a/shared-bindings/supervisor/RunReason.h b/shared-bindings/supervisor/RunReason.h
index 934c72fd8c..391e6d3064 100644
--- a/shared-bindings/supervisor/RunReason.h
+++ b/shared-bindings/supervisor/RunReason.h
@@ -28,7 +28,7 @@
 
 typedef enum {
     RUN_REASON_STARTUP,
-    RUN_REASON_AUTORELOAD,
+    RUN_REASON_AUTO_RELOAD,
     RUN_REASON_SUPERVISOR_RELOAD,
     RUN_REASON_REPL_RELOAD,
 } supervisor_run_reason_t;
diff --git a/shared-bindings/supervisor/Runtime.c b/shared-bindings/supervisor/Runtime.c
index 6500dadd59..67193e051e 100755
--- a/shared-bindings/supervisor/Runtime.c
+++ b/shared-bindings/supervisor/Runtime.c
@@ -25,9 +25,13 @@
  */
 
 #include <stdbool.h>
+#include "py/enum.h"
 #include "py/objproperty.h"
+#include "shared-bindings/supervisor/RunReason.h"
 #include "shared-bindings/supervisor/Runtime.h"
 
+STATIC supervisor_run_reason_t _run_reason;
+
 //TODO: add USB, REPL to description once they're operational
 //| class Runtime:
 //|     """Current status of runtime objects.
@@ -94,8 +98,7 @@ const mp_obj_property_t supervisor_serial_bytes_available_obj = {
 //|     """Returns why CircuitPython started running this particular time.
 //|
 STATIC mp_obj_t supervisor_get_run_reason(mp_obj_t self) {
-    mp_raise_NotImplementedError(NULL);
-    return mp_const_none;
+    return cp_enum_find(&supervisor_run_reason_type, _run_reason);
 }
 MP_DEFINE_CONST_FUN_OBJ_1(supervisor_get_run_reason_obj, supervisor_get_run_reason);
 
@@ -106,6 +109,9 @@ const mp_obj_property_t supervisor_run_reason_obj = {
               (mp_obj_t)&mp_const_none_obj},
 };
 
+void supervisor_set_run_reason(supervisor_run_reason_t run_reason) {
+    _run_reason = run_reason;
+}
 
 STATIC const mp_rom_map_elem_t supervisor_runtime_locals_dict_table[] = {
     { MP_ROM_QSTR(MP_QSTR_serial_connected), MP_ROM_PTR(&supervisor_serial_connected_obj) },
diff --git a/shared-bindings/supervisor/Runtime.h b/shared-bindings/supervisor/Runtime.h
index 2dc59c3ab6..51ed7604df 100755
--- a/shared-bindings/supervisor/Runtime.h
+++ b/shared-bindings/supervisor/Runtime.h
@@ -30,9 +30,12 @@
 #include <stdbool.h>
 #include "py/obj.h"
 
+#include "shared-bindings/supervisor/RunReason.h"
 
 extern const mp_obj_type_t supervisor_runtime_type;
 
+void supervisor_set_run_reason(supervisor_run_reason_t run_reason);
+
 bool common_hal_get_serial_connected(void);
 
 bool common_hal_get_serial_bytes_available(void);
diff --git a/shared-bindings/supervisor/__init__.c b/shared-bindings/supervisor/__init__.c
index bc6fdbff5a..4d2d6db309 100644
--- a/shared-bindings/supervisor/__init__.c
+++ b/shared-bindings/supervisor/__init__.c
@@ -88,6 +88,7 @@ MP_DEFINE_CONST_FUN_OBJ_1(supervisor_set_rgb_status_brightness_obj, supervisor_s
 //|
 STATIC mp_obj_t supervisor_reload(void) {
     reload_requested = true;
+    supervisor_set_run_reason(RUN_REASON_SUPERVISOR_RELOAD);
     mp_raise_reload_exception();
     return mp_const_none;
 }
diff --git a/supervisor/shared/usb/usb.c b/supervisor/shared/usb/usb.c
index 3d76e7000a..ff08ade18a 100644
--- a/supervisor/shared/usb/usb.c
+++ b/supervisor/shared/usb/usb.c
@@ -106,25 +106,21 @@ void usb_irq_handler(void) {
 // Invoked when device is mounted
 void tud_mount_cb(void) {
     usb_msc_mount();
-    _workflow_active = true;
 }
 
 // Invoked when device is unmounted
 void tud_umount_cb(void) {
     usb_msc_umount();
-    _workflow_active = false;
 }
 
 // Invoked when usb bus is suspended
 // remote_wakeup_en : if host allows us to perform remote wakeup
 // USB Specs: Within 7ms, device must draw an average current less than 2.5 mA from bus
 void tud_suspend_cb(bool remote_wakeup_en) {
-    _workflow_active = false;
 }
 
 // Invoked when usb bus is resumed
 void tud_resume_cb(void) {
-    _workflow_active = true;
 }
 
 // Invoked when cdc when line state changed e.g connected/disconnected
diff --git a/supervisor/shared/workflow.c b/supervisor/shared/workflow.c
index cd19d3aa25..41af22eb70 100644
--- a/supervisor/shared/workflow.c
+++ b/supervisor/shared/workflow.c
@@ -25,10 +25,10 @@
  */
 
 #include <stdbool.h>
-
-// Set by the shared USB code.
-volatile bool _workflow_active;
+#include "tusb.h"
 
 bool supervisor_workflow_active(void) {
-    return _workflow_active;
+    // Eventually there might be other non-USB workflows, such as BLE.
+    // tud_ready() checks for usb mounted and not suspended.
+    return tud_ready();
 }