3 files changed, 120 insertions, 0 deletions
diff --git a/shared-bindings/supervisor/RunReason.c b/shared-bindings/supervisor/RunReason.c
new file mode 100644
index 000000000..5233cf959
--- /dev/null
+++ b/shared-bindings/supervisor/RunReason.c
@@ -0,0 +1,62 @@
+/*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2020 Scott Shawcroft for Adafruit Industries
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#include "py/enum.h"
+
+#include "shared-bindings/supervisor/RunReason.h"
+
+MAKE_ENUM_VALUE(canio_bus_state_type, run_reason, ERROR_ACTIVE, RUN_REASON_STARTUP);
+MAKE_ENUM_VALUE(canio_bus_state_type, bus_state, ERROR_PASSIVE, RUN_REASON_AUTORELOAD);
+MAKE_ENUM_VALUE(canio_bus_state_type, bus_state, ERROR_WARNING, RUN_REASON_SUPERVISOR_RELOAD);
+MAKE_ENUM_VALUE(canio_bus_state_type, bus_state, BUS_OFF, RUN_REASON_RELOAD_HOTKEY);
+
+//| class RunReason:
+//|     """The state of the CAN bus"""
+//|
+//|     STARTUP: object
+//|     """The first VM was run after the microcontroller started up. See `microcontroller.start_reason`
+//|        for more detail why the microcontroller was started."""
+//|
+//|     AUTORELOAD: object
+//|     """The VM was run due to a USB write to the filesystem."""
+//|
+//|     SUPERVISOR_RELOAD: object
+//|     """The VM was run due to a call to `supervisor.reload()`."""
+//|
+//|     RELOAD_HOTKEY: object
+//|     """The VM was run due CTRL-D."""
+//|
+MAKE_ENUM_MAP(canio_bus_state) {
+    MAKE_ENUM_MAP_ENTRY(bus_state, ERROR_ACTIVE),
+    MAKE_ENUM_MAP_ENTRY(bus_state, ERROR_PASSIVE),
+    MAKE_ENUM_MAP_ENTRY(bus_state, ERROR_WARNING),
+    MAKE_ENUM_MAP_ENTRY(bus_state, BUS_OFF),
+};
+STATIC MP_DEFINE_CONST_DICT(canio_bus_state_locals_dict, canio_bus_state_locals_table);
+
+MAKE_PRINTER(canio, canio_bus_state);
+
+MAKE_ENUM_TYPE(canio, BusState, canio_bus_state);
diff --git a/shared-bindings/supervisor/RunReason.h b/shared-bindings/supervisor/RunReason.h
new file mode 100644
index 000000000..f9aaacae6
--- /dev/null
+++ b/shared-bindings/supervisor/RunReason.h
@@ -0,0 +1,36 @@
+/*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2020 Scott Shawcroft for Adafruit Industries
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#pragma once
+
+typedef enum {
+    RUN_REASON_STARTUP,
+    RUN_REASON_AUTORELOAD,
+    RUN_REASON_SUPERVISOR_RELOAD,
+    RUN_REASON_RELOAD_HOTKEY
+} supervisor_run_reason_t;
+
+extern const mp_obj_type_t canio_bus_state_type;
diff --git a/shared-bindings/supervisor/Runtime.c b/shared-bindings/supervisor/Runtime.c
index bfca6e7b1..f9db38c9b 100755
--- a/shared-bindings/supervisor/Runtime.c
+++ b/shared-bindings/supervisor/Runtime.c
@@ -90,9 +90,31 @@ const mp_obj_property_t supervisor_serial_bytes_available_obj = {
 };
 
 
+//|     run_reason: RunReason
+//|     """Returns why the Python VM was run this time."""
+//|
+STATIC mp_obj_t supervisor_get_run_reason(mp_obj_t self) {
+    if (!common_hal_get_serial_bytes_available()) {
+        return mp_const_false;
+    }
+    else {
+        return mp_const_true;
+    }
+}
+MP_DEFINE_CONST_FUN_OBJ_1(supervisor_get_run_reason_obj, supervisor_get_run_reason);
+
+const mp_obj_property_t supervisor_run_reason_obj = {
+    .base.type = &mp_type_property,
+    .proxy = {(mp_obj_t)&supervisor_get_run_reason_obj,
+              (mp_obj_t)&mp_const_none_obj,
+              (mp_obj_t)&mp_const_none_obj},
+};
+
+
 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) },
     { MP_ROM_QSTR(MP_QSTR_serial_bytes_available), MP_ROM_PTR(&supervisor_serial_bytes_available_obj) },
+    { MP_ROM_QSTR(MP_QSTR_run_reason), MP_ROM_PTR(&supervisor_run_reason_obj) },
 };
 
 STATIC MP_DEFINE_CONST_DICT(supervisor_runtime_locals_dict, supervisor_runtime_locals_dict_table);