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diff --git a/circuitpython/shared-bindings/countio/Edge.c b/circuitpython/shared-bindings/countio/Edge.c
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+++ b/circuitpython/shared-bindings/countio/Edge.c
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+/*
+ * This file is part of the Micro Python project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2021 Dan Halbert 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/obj.h"
+#include "py/enum.h"
+#include "py/runtime.h"
+
+#include "shared-bindings/countio/Edge.h"
+
+MAKE_ENUM_VALUE(countio_edge_type, edge, RISE, EDGE_RISE);
+MAKE_ENUM_VALUE(countio_edge_type, edge, FALL, EDGE_FALL);
+MAKE_ENUM_VALUE(countio_edge_type, edge, RISE_AND_FALL, EDGE_RISE_AND_FALL);
+
+//| class Edge:
+//|     """Enumerates which signal transitions can be counted."""
+//|
+//|     def __init__(self) -> None:
+//|         """Enum-like class to define which signal transitions to count."""
+//|         ...
+//|
+//|     RISE: Edge
+//|     """Count the rising edges."""
+//|
+//|     FALL: Edge
+//|     """Count the falling edges."""
+//|
+//|     RISE_AND_FALL: Edge
+//|     """Count the rising and falling edges."""
+//|
+MAKE_ENUM_MAP(countio_edge) {
+    MAKE_ENUM_MAP_ENTRY(edge, RISE),
+    MAKE_ENUM_MAP_ENTRY(edge, FALL),
+    MAKE_ENUM_MAP_ENTRY(edge, RISE_AND_FALL),
+};
+
+STATIC MP_DEFINE_CONST_DICT(countio_edge_locals_dict, countio_edge_locals_table);
+
+MAKE_PRINTER(countio, countio_edge);
+
+MAKE_ENUM_TYPE(countio, Edge, countio_edge);
+
+countio_edge_t validate_edge(mp_obj_t obj, qstr arg_name) {
+    return cp_enum_value(&countio_edge_type, mp_arg_validate_type(obj, &countio_edge_type, arg_name));
+}