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diff --git a/shared-bindings/usb_cdc/__init__.c b/shared-bindings/usb_cdc/__init__.c
new file mode 100644
index 000000000..d6a70b177
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+++ b/shared-bindings/usb_cdc/__init__.c
@@ -0,0 +1,57 @@
+/*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2021 Dan Halbertfor 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 <stdint.h>
+
+#include "py/obj.h"
+#include "py/runtime.h"
+
+#include "shared-bindings/usb_cdc/__init__.h"
+#include "shared-bindings/usb_cdc/Serial.h"
+
+#include "py/runtime.h"
+
+//| """USB CDC Serial streams
+//|
+//| The `usb_cdc` module allows access to USB CDC (serial) communications.
+//|
+//| serial: Tuple[Serial, ...]
+//| """Tuple of all CDC streams. Each item is a `Serial`."""
+//|
+
+mp_map_elem_t usb_cdc_module_globals_table[] = {
+    { MP_ROM_QSTR(MP_QSTR___name__), MP_ROM_QSTR(MP_QSTR_usb_cdc) },
+    { MP_ROM_QSTR(MP_QSTR_Serial),   MP_OBJ_FROM_PTR(&usb_cdc_serial_type) },
+    { MP_ROM_QSTR(MP_QSTR_serial),   mp_const_empty_tuple },
+};
+
+// This isn't const so we can set the streams dynamically.
+MP_DEFINE_MUTABLE_DICT(usb_cdc_module_globals, usb_cdc_module_globals_table);
+
+const mp_obj_module_t usb_cdc_module = {
+    .base = { &mp_type_module },
+    .globals = (mp_obj_dict_t*)&usb_cdc_module_globals,
+};