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diff --git a/circuitpython/shared-bindings/bitbangio/__init__.c b/circuitpython/shared-bindings/bitbangio/__init__.c
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+/*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2016 Scott Shawcroft
+ *
+ * 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.
+ */
+
+// bitbangio implements some standard protocols in the processor. Its only
+// dependency is digitalio.
+
+#include <stdint.h>
+
+#include "py/obj.h"
+#include "py/runtime.h"
+
+#include "shared-bindings/bitbangio/__init__.h"
+#include "shared-bindings/bitbangio/I2C.h"
+#include "shared-bindings/onewireio/OneWire.h"
+#include "shared-bindings/bitbangio/SPI.h"
+
+#include "py/runtime.h"
+
+//| """Digital protocols implemented by the CPU
+//|
+//| The `bitbangio` module contains classes to provide digital bus protocol
+//| support regardless of whether the underlying hardware exists to use the
+//| protocol.
+//|
+//| First try to use `busio` module instead which may utilize peripheral
+//| hardware to implement the protocols. Native implementations will be faster
+//| than bitbanged versions and have more capabilities.
+//|
+//| All classes change hardware state and should be deinitialized when they
+//| are no longer needed if the program continues after use. To do so, either
+//| call :py:meth:`!deinit` or use a context manager. See
+//| :ref:`lifetime-and-contextmanagers` for more info.
+//|
+//| For example::
+//|
+//|   import bitbangio
+//|   from board import *
+//|
+//|   i2c = bitbangio.I2C(SCL, SDA)
+//|   print(i2c.scan())
+//|   i2c.deinit()
+//|
+//| This example will initialize the the device, run
+//| :py:meth:`~bitbangio.I2C.scan` and then :py:meth:`~bitbangio.I2C.deinit` the
+//| hardware. The last step is optional because CircuitPython automatically
+//| resets hardware after a program finishes."""
+//|
+
+STATIC const mp_rom_map_elem_t bitbangio_module_globals_table[] = {
+    { MP_ROM_QSTR(MP_QSTR___name__), MP_ROM_QSTR(MP_QSTR_bitbangio) },
+    { MP_ROM_QSTR(MP_QSTR_I2C),   MP_ROM_PTR(&bitbangio_i2c_type) },
+    #if CIRCUITPY_ONEWIREIO
+    { MP_ROM_QSTR(MP_QSTR_OneWire),   MP_ROM_PTR(&onewireio_onewire_type) },
+    #endif
+    { MP_ROM_QSTR(MP_QSTR_SPI),   MP_ROM_PTR(&bitbangio_spi_type) },
+};
+
+STATIC MP_DEFINE_CONST_DICT(bitbangio_module_globals, bitbangio_module_globals_table);
+
+const mp_obj_module_t bitbangio_module = {
+    .base = { &mp_type_module },
+    .globals = (mp_obj_dict_t *)&bitbangio_module_globals,
+};
+
+MP_REGISTER_MODULE(MP_QSTR_bitbangio, bitbangio_module, CIRCUITPY_BITBANGIO);