add circuitpython code

10 files changed, 950 insertions, 0 deletions

diff --git a/circuitpython/shared-bindings/digitalio/DigitalInOut.c b/circuitpython/shared-bindings/digitalio/DigitalInOut.c
new file mode 100644
index 0000000..37093ad
--- /dev/null
+++ b/circuitpython/shared-bindings/digitalio/DigitalInOut.c
@@ -0,0 +1,363 @@
+/*
+ * This file is part of the Micro Python project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * SPDX-FileCopyrightText: Copyright (c) 2013, 2014 Damien P. George
+ *
+ * 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 <string.h>
+
+#include "shared/runtime/context_manager_helpers.h"
+
+#include "py/nlr.h"
+#include "py/objtype.h"
+#include "py/objproperty.h"
+#include "py/runtime.h"
+#include "py/mphal.h"
+
+#include "shared-bindings/microcontroller/Pin.h"
+#include "shared-bindings/digitalio/DigitalInOut.h"
+#include "shared-bindings/digitalio/Direction.h"
+#include "shared-bindings/digitalio/DriveMode.h"
+#include "shared-bindings/digitalio/Pull.h"
+#include "shared-bindings/util.h"
+#include "supervisor/shared/translate.h"
+
+//| class DigitalInOut:
+//|     """Digital input and output
+//|
+//|     A DigitalInOut is used to digitally control I/O pins. For analog control of
+//|     a pin, see the :py:class:`analogio.AnalogIn` and
+//|     :py:class:`analogio.AnalogOut` classes."""
+//|
+//|     def __init__(self, pin: microcontroller.Pin) -> None:
+//|         """Create a new DigitalInOut object associated with the pin. Defaults to input
+//|         with no pull. Use :py:meth:`switch_to_input` and
+//|         :py:meth:`switch_to_output` to change the direction.
+//|
+//|         :param ~microcontroller.Pin pin: The pin to control"""
+//|         ...
+//|
+STATIC mp_obj_t digitalio_digitalinout_make_new(const mp_obj_type_t *type,
+    size_t n_args, size_t n_kw, const mp_obj_t *args) {
+    mp_arg_check_num(n_args, n_kw, 1, 1, false);
+
+    digitalio_digitalinout_obj_t *self = m_new_obj(digitalio_digitalinout_obj_t);
+    self->base.type = &digitalio_digitalinout_type;
+
+    const mcu_pin_obj_t *pin = validate_obj_is_free_pin(args[0]);
+    common_hal_digitalio_digitalinout_construct(self, pin);
+
+    return MP_OBJ_FROM_PTR(self);
+}
+
+//|     def deinit(self) -> None:
+//|         """Turn off the DigitalInOut and release the pin for other use."""
+//|         ...
+//|
+STATIC mp_obj_t digitalio_digitalinout_obj_deinit(mp_obj_t self_in) {
+    digitalio_digitalinout_obj_t *self = MP_OBJ_TO_PTR(self_in);
+    common_hal_digitalio_digitalinout_deinit(self);
+    return mp_const_none;
+}
+MP_DEFINE_CONST_FUN_OBJ_1(digitalio_digitalinout_deinit_obj, digitalio_digitalinout_obj_deinit);
+
+//|     def __enter__(self) -> DigitalInOut:
+//|         """No-op used by Context Managers."""
+//|         ...
+//|
+//  Provided by context manager helper.
+
+//|     def __exit__(self) -> None:
+//|         """Automatically deinitializes the hardware when exiting a context. See
+//|         :ref:`lifetime-and-contextmanagers` for more info."""
+//|         ...
+//|
+STATIC mp_obj_t digitalio_digitalinout_obj___exit__(size_t n_args, const mp_obj_t *args) {
+    (void)n_args;
+    common_hal_digitalio_digitalinout_deinit(MP_OBJ_TO_PTR(args[0]));
+    return mp_const_none;
+}
+STATIC MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(digitalio_digitalinout_obj___exit___obj, 4, 4, digitalio_digitalinout_obj___exit__);
+
+STATIC void check_for_deinit(digitalio_digitalinout_obj_t *self) {
+    if (common_hal_digitalio_digitalinout_deinited(self)) {
+        raise_deinited_error();
+    }
+}
+
+//|     def switch_to_output(self, value: bool = False, drive_mode: DriveMode = DriveMode.PUSH_PULL) -> None:
+//|         """Set the drive mode and value and then switch to writing out digital
+//|         values.
+//|
+//|         :param bool value: default value to set upon switching
+//|         :param ~digitalio.DriveMode drive_mode: drive mode for the output
+//|         """
+//|         ...
+//|
+STATIC mp_obj_t digitalio_digitalinout_switch_to_output(size_t n_args, const mp_obj_t *pos_args, mp_map_t *kw_args) {
+    enum { ARG_value, ARG_drive_mode };
+    static const mp_arg_t allowed_args[] = {
+        { MP_QSTR_value,      MP_ARG_BOOL, {.u_bool = false} },
+        { MP_QSTR_drive_mode, MP_ARG_OBJ, {.u_rom_obj = MP_ROM_PTR(&digitalio_drive_mode_push_pull_obj)} },
+    };
+    digitalio_digitalinout_obj_t *self = MP_OBJ_TO_PTR(pos_args[0]);
+    check_for_deinit(self);
+    mp_arg_val_t args[MP_ARRAY_SIZE(allowed_args)];
+    mp_arg_parse_all(n_args - 1, pos_args + 1, kw_args, MP_ARRAY_SIZE(allowed_args), allowed_args, args);
+
+    digitalio_drive_mode_t drive_mode = DRIVE_MODE_PUSH_PULL;
+    if (args[ARG_drive_mode].u_rom_obj == MP_ROM_PTR(&digitalio_drive_mode_open_drain_obj)) {
+        drive_mode = DRIVE_MODE_OPEN_DRAIN;
+    }
+    // do the transfer
+    digitalinout_result_t result = common_hal_digitalio_digitalinout_switch_to_output(self, args[ARG_value].u_bool, drive_mode);
+    if (result == DIGITALINOUT_INPUT_ONLY) {
+        mp_raise_NotImplementedError(translate("Pin is input only"));
+    }
+    return mp_const_none;
+}
+MP_DEFINE_CONST_FUN_OBJ_KW(digitalio_digitalinout_switch_to_output_obj, 1, digitalio_digitalinout_switch_to_output);
+
+//|     def switch_to_input(self, pull: Optional[Pull] = None) -> None:
+//|         """Set the pull and then switch to read in digital values.
+//|
+//|         :param Pull pull: pull configuration for the input
+//|
+//|         Example usage::
+//|
+//|           import digitalio
+//|           import board
+//|
+//|           switch = digitalio.DigitalInOut(board.SLIDE_SWITCH)
+//|           switch.switch_to_input(pull=digitalio.Pull.UP)
+//|           # Or, after switch_to_input
+//|           switch.pull = digitalio.Pull.UP
+//|           print(switch.value)"""
+//|         ...
+//|
+STATIC mp_obj_t digitalio_digitalinout_switch_to_input(size_t n_args, const mp_obj_t *pos_args, mp_map_t *kw_args) {
+    enum { ARG_pull };
+    static const mp_arg_t allowed_args[] = {
+        { MP_QSTR_pull, MP_ARG_OBJ, {.u_rom_obj = mp_const_none} },
+    };
+    digitalio_digitalinout_obj_t *self = MP_OBJ_TO_PTR(pos_args[0]);
+    check_for_deinit(self);
+    mp_arg_val_t args[MP_ARRAY_SIZE(allowed_args)];
+    mp_arg_parse_all(n_args - 1, pos_args + 1, kw_args, MP_ARRAY_SIZE(allowed_args), allowed_args, args);
+
+    common_hal_digitalio_digitalinout_switch_to_input(self, validate_pull(args[ARG_pull].u_rom_obj, MP_QSTR_pull));
+    return mp_const_none;
+}
+MP_DEFINE_CONST_FUN_OBJ_KW(digitalio_digitalinout_switch_to_input_obj, 1, digitalio_digitalinout_switch_to_input);
+
+//|     direction: Direction
+//|     """The direction of the pin.
+//|
+//|     Setting this will use the defaults from the corresponding
+//|     :py:meth:`switch_to_input` or :py:meth:`switch_to_output` method. If
+//|     you want to set pull, value or drive mode prior to switching, then use
+//|     those methods instead."""
+//|
+typedef struct {
+    mp_obj_base_t base;
+} digitalio_digitalio_direction_obj_t;
+extern const digitalio_digitalio_direction_obj_t digitalio_digitalio_direction_in_obj;
+extern const digitalio_digitalio_direction_obj_t digitalio_digitalio_direction_out_obj;
+
+STATIC mp_obj_t digitalio_digitalinout_obj_get_direction(mp_obj_t self_in) {
+    digitalio_digitalinout_obj_t *self = MP_OBJ_TO_PTR(self_in);
+    check_for_deinit(self);
+    digitalio_direction_t direction = common_hal_digitalio_digitalinout_get_direction(self);
+    if (direction == DIRECTION_INPUT) {
+        return (mp_obj_t)&digitalio_direction_input_obj;
+    }
+    return (mp_obj_t)&digitalio_direction_output_obj;
+}
+MP_DEFINE_CONST_FUN_OBJ_1(digitalio_digitalinout_get_direction_obj, digitalio_digitalinout_obj_get_direction);
+
+STATIC mp_obj_t digitalio_digitalinout_obj_set_direction(mp_obj_t self_in, mp_obj_t value) {
+    digitalio_digitalinout_obj_t *self = MP_OBJ_TO_PTR(self_in);
+    check_for_deinit(self);
+    if (value == MP_ROM_PTR(&digitalio_direction_input_obj)) {
+        common_hal_digitalio_digitalinout_switch_to_input(self, PULL_NONE);
+    } else if (value == MP_ROM_PTR(&digitalio_direction_output_obj)) {
+        digitalinout_result_t result = common_hal_digitalio_digitalinout_switch_to_output(self, false, DRIVE_MODE_PUSH_PULL);
+        if (result == DIGITALINOUT_INPUT_ONLY) {
+            mp_raise_NotImplementedError(translate("Pin is input only"));
+        }
+    } else {
+        mp_raise_ValueError(translate("Invalid direction."));
+    }
+    return mp_const_none;
+}
+MP_DEFINE_CONST_FUN_OBJ_2(digitalio_digitalinout_set_direction_obj, digitalio_digitalinout_obj_set_direction);
+
+MP_PROPERTY_GETSET(digitalio_digitalio_direction_obj,
+    (mp_obj_t)&digitalio_digitalinout_get_direction_obj,
+    (mp_obj_t)&digitalio_digitalinout_set_direction_obj);
+
+//|     value: bool
+//|     """The digital logic level of the pin."""
+//|
+STATIC mp_obj_t digitalio_digitalinout_obj_get_value(mp_obj_t self_in) {
+    digitalio_digitalinout_obj_t *self = MP_OBJ_TO_PTR(self_in);
+    check_for_deinit(self);
+    bool value = common_hal_digitalio_digitalinout_get_value(self);
+    return mp_obj_new_bool(value);
+}
+MP_DEFINE_CONST_FUN_OBJ_1(digitalio_digitalinout_get_value_obj, digitalio_digitalinout_obj_get_value);
+
+STATIC mp_obj_t digitalio_digitalinout_obj_set_value(mp_obj_t self_in, mp_obj_t value) {
+    digitalio_digitalinout_obj_t *self = MP_OBJ_TO_PTR(self_in);
+    check_for_deinit(self);
+    if (common_hal_digitalio_digitalinout_get_direction(self) == DIRECTION_INPUT) {
+        mp_raise_AttributeError(translate("Cannot set value when direction is input."));
+        return mp_const_none;
+    }
+    common_hal_digitalio_digitalinout_set_value(self, mp_obj_is_true(value));
+    return mp_const_none;
+}
+MP_DEFINE_CONST_FUN_OBJ_2(digitalio_digitalinout_set_value_obj, digitalio_digitalinout_obj_set_value);
+
+MP_PROPERTY_GETSET(digitalio_digitalinout_value_obj,
+    (mp_obj_t)&digitalio_digitalinout_get_value_obj,
+    (mp_obj_t)&digitalio_digitalinout_set_value_obj);
+
+//|     drive_mode: DriveMode
+//|     """The pin drive mode. One of:
+//|
+//|     - `digitalio.DriveMode.PUSH_PULL`
+//|     - `digitalio.DriveMode.OPEN_DRAIN`"""
+//|
+STATIC mp_obj_t digitalio_digitalinout_obj_get_drive_mode(mp_obj_t self_in) {
+    digitalio_digitalinout_obj_t *self = MP_OBJ_TO_PTR(self_in);
+    check_for_deinit(self);
+    if (common_hal_digitalio_digitalinout_get_direction(self) == DIRECTION_INPUT) {
+        mp_raise_AttributeError(translate("Drive mode not used when direction is input."));
+        return mp_const_none;
+    }
+    digitalio_drive_mode_t drive_mode = common_hal_digitalio_digitalinout_get_drive_mode(self);
+    if (drive_mode == DRIVE_MODE_PUSH_PULL) {
+        return (mp_obj_t)&digitalio_drive_mode_push_pull_obj;
+    }
+    return (mp_obj_t)&digitalio_drive_mode_open_drain_obj;
+}
+MP_DEFINE_CONST_FUN_OBJ_1(digitalio_digitalinout_get_drive_mode_obj, digitalio_digitalinout_obj_get_drive_mode);
+
+STATIC mp_obj_t digitalio_digitalinout_obj_set_drive_mode(mp_obj_t self_in, mp_obj_t drive_mode) {
+    digitalio_digitalinout_obj_t *self = MP_OBJ_TO_PTR(self_in);
+    check_for_deinit(self);
+    if (common_hal_digitalio_digitalinout_get_direction(self) == DIRECTION_INPUT) {
+        mp_raise_AttributeError(translate("Drive mode not used when direction is input."));
+        return mp_const_none;
+    }
+    digitalio_drive_mode_t c_drive_mode = DRIVE_MODE_PUSH_PULL;
+    if (drive_mode == MP_ROM_PTR(&digitalio_drive_mode_open_drain_obj)) {
+        c_drive_mode = DRIVE_MODE_OPEN_DRAIN;
+    }
+    common_hal_digitalio_digitalinout_set_drive_mode(self, c_drive_mode);
+    return mp_const_none;
+}
+MP_DEFINE_CONST_FUN_OBJ_2(digitalio_digitalinout_set_drive_mode_obj, digitalio_digitalinout_obj_set_drive_mode);
+
+MP_PROPERTY_GETSET(digitalio_digitalio_drive_mode_obj,
+    (mp_obj_t)&digitalio_digitalinout_get_drive_mode_obj,
+    (mp_obj_t)&digitalio_digitalinout_set_drive_mode_obj);
+
+//|     pull: Optional[Pull]
+//|     """The pin pull direction. One of:
+//|
+//|     - `digitalio.Pull.UP`
+//|     - `digitalio.Pull.DOWN`
+//|     - `None`
+//|
+//|     :raises AttributeError: if `direction` is :py:data:`~digitalio.Direction.OUTPUT`."""
+//|
+STATIC mp_obj_t digitalio_digitalinout_obj_get_pull(mp_obj_t self_in) {
+    digitalio_digitalinout_obj_t *self = MP_OBJ_TO_PTR(self_in);
+    check_for_deinit(self);
+    if (common_hal_digitalio_digitalinout_get_direction(self) == DIRECTION_OUTPUT) {
+        mp_raise_AttributeError(translate("Pull not used when direction is output."));
+        return mp_const_none;
+    }
+    digitalio_pull_t pull = common_hal_digitalio_digitalinout_get_pull(self);
+    if (pull == PULL_UP) {
+        return MP_OBJ_FROM_PTR(&digitalio_pull_up_obj);
+    } else if (pull == PULL_DOWN) {
+        return MP_OBJ_FROM_PTR(&digitalio_pull_down_obj);
+    }
+    return mp_const_none;
+}
+MP_DEFINE_CONST_FUN_OBJ_1(digitalio_digitalinout_get_pull_obj, digitalio_digitalinout_obj_get_pull);
+
+STATIC mp_obj_t digitalio_digitalinout_obj_set_pull(mp_obj_t self_in, mp_obj_t pull_obj) {
+    digitalio_digitalinout_obj_t *self = MP_OBJ_TO_PTR(self_in);
+    check_for_deinit(self);
+    if (common_hal_digitalio_digitalinout_get_direction(self) == DIRECTION_OUTPUT) {
+        mp_raise_AttributeError(translate("Pull not used when direction is output."));
+        return mp_const_none;
+    }
+
+    common_hal_digitalio_digitalinout_set_pull(self, validate_pull(pull_obj, MP_QSTR_pull));
+    return mp_const_none;
+}
+MP_DEFINE_CONST_FUN_OBJ_2(digitalio_digitalinout_set_pull_obj, digitalio_digitalinout_obj_set_pull);
+
+MP_PROPERTY_GETSET(digitalio_digitalio_pull_obj,
+    (mp_obj_t)&digitalio_digitalinout_get_pull_obj,
+    (mp_obj_t)&digitalio_digitalinout_set_pull_obj);
+
+STATIC const mp_rom_map_elem_t digitalio_digitalinout_locals_dict_table[] = {
+    // instance methods
+    { MP_ROM_QSTR(MP_QSTR_deinit),             MP_ROM_PTR(&digitalio_digitalinout_deinit_obj) },
+    { MP_ROM_QSTR(MP_QSTR___enter__),          MP_ROM_PTR(&default___enter___obj) },
+    { MP_ROM_QSTR(MP_QSTR___exit__),           MP_ROM_PTR(&digitalio_digitalinout_obj___exit___obj) },
+    { MP_ROM_QSTR(MP_QSTR_switch_to_output),   MP_ROM_PTR(&digitalio_digitalinout_switch_to_output_obj) },
+    { MP_ROM_QSTR(MP_QSTR_switch_to_input),    MP_ROM_PTR(&digitalio_digitalinout_switch_to_input_obj) },
+
+    // Properties
+    { MP_ROM_QSTR(MP_QSTR_direction),          MP_ROM_PTR(&digitalio_digitalio_direction_obj) },
+    { MP_ROM_QSTR(MP_QSTR_value),              MP_ROM_PTR(&digitalio_digitalinout_value_obj) },
+    { MP_ROM_QSTR(MP_QSTR_drive_mode),         MP_ROM_PTR(&digitalio_digitalio_drive_mode_obj) },
+    { MP_ROM_QSTR(MP_QSTR_pull),               MP_ROM_PTR(&digitalio_digitalio_pull_obj) },
+};
+
+STATIC MP_DEFINE_CONST_DICT(digitalio_digitalinout_locals_dict, digitalio_digitalinout_locals_dict_table);
+
+const mp_obj_type_t digitalio_digitalinout_type = {
+    { &mp_type_type },
+    .name = MP_QSTR_DigitalInOut,
+    .make_new = digitalio_digitalinout_make_new,
+    .locals_dict = (mp_obj_dict_t *)&digitalio_digitalinout_locals_dict,
+};
+
+// Helper for validating digitalio.DigitalInOut arguments
+digitalio_digitalinout_obj_t *assert_digitalinout(mp_obj_t obj) {
+    if (!mp_obj_is_type(obj, &digitalio_digitalinout_type)) {
+        mp_raise_TypeError(translate("argument num/types mismatch"));
+    }
+    digitalio_digitalinout_obj_t *pin = MP_OBJ_TO_PTR(obj);
+    check_for_deinit(pin);
+    return pin;
+}
diff --git a/circuitpython/shared-bindings/digitalio/DigitalInOut.h b/circuitpython/shared-bindings/digitalio/DigitalInOut.h
new file mode 100644
index 0000000..b6edbc6
--- /dev/null
+++ b/circuitpython/shared-bindings/digitalio/DigitalInOut.h
@@ -0,0 +1,70 @@
+/*
+ * This file is part of the Micro Python project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * SPDX-FileCopyrightText: Copyright (c) 2013, 2014 Damien P. George
+ *
+ * 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.
+ */
+
+#ifndef MICROPY_INCLUDED_SHARED_BINDINGS_DIGITALIO_DIGITALINOUT_H
+#define MICROPY_INCLUDED_SHARED_BINDINGS_DIGITALIO_DIGITALINOUT_H
+
+#include "common-hal/microcontroller/Pin.h"
+#include "common-hal/digitalio/DigitalInOut.h"
+#include "shared-bindings/digitalio/Direction.h"
+#include "shared-bindings/digitalio/DriveMode.h"
+#include "shared-bindings/digitalio/Pull.h"
+
+extern const mp_obj_type_t digitalio_digitalinout_type;
+
+typedef enum {
+    DIGITALINOUT_OK,
+    DIGITALINOUT_PIN_BUSY,
+    DIGITALINOUT_INPUT_ONLY
+} digitalinout_result_t;
+
+typedef enum {
+    DIGITALINOUT_REG_READ,
+    DIGITALINOUT_REG_WRITE,
+    DIGITALINOUT_REG_SET,
+    DIGITALINOUT_REG_RESET,
+    DIGITALINOUT_REG_TOGGLE,
+} digitalinout_reg_op_t;
+
+digitalinout_result_t common_hal_digitalio_digitalinout_construct(digitalio_digitalinout_obj_t *self, const mcu_pin_obj_t *pin);
+void common_hal_digitalio_digitalinout_deinit(digitalio_digitalinout_obj_t *self);
+bool common_hal_digitalio_digitalinout_deinited(digitalio_digitalinout_obj_t *self);
+void common_hal_digitalio_digitalinout_switch_to_input(digitalio_digitalinout_obj_t *self, digitalio_pull_t pull);
+digitalinout_result_t common_hal_digitalio_digitalinout_switch_to_output(digitalio_digitalinout_obj_t *self, bool value, digitalio_drive_mode_t drive_mode);
+digitalio_direction_t common_hal_digitalio_digitalinout_get_direction(digitalio_digitalinout_obj_t *self);
+void common_hal_digitalio_digitalinout_set_value(digitalio_digitalinout_obj_t *self, bool value);
+bool common_hal_digitalio_digitalinout_get_value(digitalio_digitalinout_obj_t *self);
+digitalinout_result_t common_hal_digitalio_digitalinout_set_drive_mode(digitalio_digitalinout_obj_t *self, digitalio_drive_mode_t drive_mode);
+digitalio_drive_mode_t common_hal_digitalio_digitalinout_get_drive_mode(digitalio_digitalinout_obj_t *self);
+void common_hal_digitalio_digitalinout_set_pull(digitalio_digitalinout_obj_t *self, digitalio_pull_t pull);
+digitalio_pull_t common_hal_digitalio_digitalinout_get_pull(digitalio_digitalinout_obj_t *self);
+void common_hal_digitalio_digitalinout_never_reset(digitalio_digitalinout_obj_t *self);
+digitalio_digitalinout_obj_t *assert_digitalinout(mp_obj_t obj);
+
+volatile uint32_t *common_hal_digitalio_digitalinout_get_reg(digitalio_digitalinout_obj_t *self, digitalinout_reg_op_t op, uint32_t *mask);
+bool common_hal_digitalio_has_reg_op(digitalinout_reg_op_t op);
+
+#endif // MICROPY_INCLUDED_SHARED_BINDINGS_DIGITALIO_DIGITALINOUT_H
diff --git a/circuitpython/shared-bindings/digitalio/Direction.c b/circuitpython/shared-bindings/digitalio/Direction.c
new file mode 100644
index 0000000..0ed18f8
--- /dev/null
+++ b/circuitpython/shared-bindings/digitalio/Direction.c
@@ -0,0 +1,84 @@
+/*
+ * This file is part of the Micro Python project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2017 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 <stdint.h>
+#include <string.h>
+
+#include "shared/runtime/context_manager_helpers.h"
+
+#include "py/nlr.h"
+#include "py/objtype.h"
+#include "py/objproperty.h"
+#include "py/runtime.h"
+#include "py/mphal.h"
+
+#include "shared-bindings/microcontroller/Pin.h"
+#include "shared-bindings/digitalio/DigitalInOut.h"
+
+//| class Direction:
+//|     """Defines the direction of a digital pin"""
+//|
+//|     def __init__(self) -> None:
+//|         """Enum-like class to define which direction the digital values are
+//|         going."""
+//|         ...
+//|
+//|     INPUT: Direction
+//|     """Read digital data in"""
+//|
+//|     OUTPUT: Direction
+//|     """Write digital data out"""
+//|
+const mp_obj_type_t digitalio_direction_type;
+
+const digitalio_direction_obj_t digitalio_direction_input_obj = {
+    { &digitalio_direction_type },
+};
+
+const digitalio_direction_obj_t digitalio_direction_output_obj = {
+    { &digitalio_direction_type },
+};
+
+STATIC const mp_rom_map_elem_t digitalio_direction_locals_dict_table[] = {
+    { MP_ROM_QSTR(MP_QSTR_INPUT),    MP_ROM_PTR(&digitalio_direction_input_obj) },
+    { MP_ROM_QSTR(MP_QSTR_OUTPUT),   MP_ROM_PTR(&digitalio_direction_output_obj) },
+};
+STATIC MP_DEFINE_CONST_DICT(digitalio_direction_locals_dict, digitalio_direction_locals_dict_table);
+
+STATIC void digitalio_direction_print(const mp_print_t *print, mp_obj_t self_in, mp_print_kind_t kind) {
+    qstr direction = MP_QSTR_INPUT;
+    if (self_in == MP_ROM_PTR(&digitalio_direction_output_obj)) {
+        direction = MP_QSTR_OUTPUT;
+    }
+    mp_printf(print, "%q.%q.%q", MP_QSTR_digitalio, MP_QSTR_Direction, direction);
+}
+
+const mp_obj_type_t digitalio_direction_type = {
+    { &mp_type_type },
+    .name = MP_QSTR_Direction,
+    .print = digitalio_direction_print,
+    .locals_dict = (mp_obj_dict_t *)&digitalio_direction_locals_dict,
+};
diff --git a/circuitpython/shared-bindings/digitalio/Direction.h b/circuitpython/shared-bindings/digitalio/Direction.h
new file mode 100644
index 0000000..17e1eda
--- /dev/null
+++ b/circuitpython/shared-bindings/digitalio/Direction.h
@@ -0,0 +1,45 @@
+/*
+ * This file is part of the Micro Python project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2017 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.
+ */
+
+#ifndef MICROPY_INCLUDED_SHARED_BINDINGS_DIGITALIO_DIRECTION_H
+#define MICROPY_INCLUDED_SHARED_BINDINGS_DIGITALIO_DIRECTION_H
+
+#include "py/obj.h"
+
+typedef enum {
+    DIRECTION_INPUT,
+    DIRECTION_OUTPUT
+} digitalio_direction_t;
+typedef struct {
+    mp_obj_base_t base;
+} digitalio_direction_obj_t;
+
+extern const mp_obj_type_t digitalio_direction_type;
+
+extern const digitalio_direction_obj_t digitalio_direction_input_obj;
+extern const digitalio_direction_obj_t digitalio_direction_output_obj;
+
+#endif // MICROPY_INCLUDED_SHARED_BINDINGS_DIGITALIO_DIRECTION_H
diff --git a/circuitpython/shared-bindings/digitalio/DriveMode.c b/circuitpython/shared-bindings/digitalio/DriveMode.c
new file mode 100644
index 0000000..c7c3400
--- /dev/null
+++ b/circuitpython/shared-bindings/digitalio/DriveMode.c
@@ -0,0 +1,73 @@
+/*
+ * This file is part of the Micro Python project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2017 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 "shared-bindings/digitalio/DriveMode.h"
+
+//| class DriveMode:
+//|     """Defines the drive mode of a digital pin"""
+//|
+//|     def __init__(self) -> None:
+//|         """Enum-like class to define the drive mode used when outputting
+//|         digital values."""
+//|         ...
+//|
+//|     PUSH_PULL: DriveMode
+//|     """Output both high and low digital values"""
+//|
+//|     OPEN_DRAIN: DriveMode
+//|     """Output low digital values but go into high z for digital high. This is
+//|     useful for i2c and other protocols that share a digital line."""
+//|
+const mp_obj_type_t digitalio_drive_mode_type;
+
+const digitalio_drive_mode_obj_t digitalio_drive_mode_push_pull_obj = {
+    { &digitalio_drive_mode_type },
+};
+
+const digitalio_drive_mode_obj_t digitalio_drive_mode_open_drain_obj = {
+    { &digitalio_drive_mode_type },
+};
+
+STATIC const mp_rom_map_elem_t digitalio_drive_mode_locals_dict_table[] = {
+    { MP_ROM_QSTR(MP_QSTR_PUSH_PULL),    MP_ROM_PTR(&digitalio_drive_mode_push_pull_obj) },
+    { MP_ROM_QSTR(MP_QSTR_OPEN_DRAIN),   MP_ROM_PTR(&digitalio_drive_mode_open_drain_obj) },
+};
+STATIC MP_DEFINE_CONST_DICT(digitalio_drive_mode_locals_dict, digitalio_drive_mode_locals_dict_table);
+
+STATIC void digitalio_drive_mode_print(const mp_print_t *print, mp_obj_t self_in, mp_print_kind_t kind) {
+    qstr drive_mode = MP_QSTR_PUSH_PULL;
+    if (self_in == MP_ROM_PTR(&digitalio_drive_mode_open_drain_obj)) {
+        drive_mode = MP_QSTR_OPEN_DRAIN;
+    }
+    mp_printf(print, "%q.%q.%q", MP_QSTR_digitalio, MP_QSTR_DriveMode, drive_mode);
+}
+
+const mp_obj_type_t digitalio_drive_mode_type = {
+    { &mp_type_type },
+    .name = MP_QSTR_DriveMode,
+    .print = digitalio_drive_mode_print,
+    .locals_dict = (mp_obj_dict_t *)&digitalio_drive_mode_locals_dict,
+};
diff --git a/circuitpython/shared-bindings/digitalio/DriveMode.h b/circuitpython/shared-bindings/digitalio/DriveMode.h
new file mode 100644
index 0000000..01ecaa4
--- /dev/null
+++ b/circuitpython/shared-bindings/digitalio/DriveMode.h
@@ -0,0 +1,46 @@
+/*
+ * This file is part of the Micro Python project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2017 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.
+ */
+
+#ifndef MICROPY_INCLUDED_SHARED_BINDINGS_DIGITALIO_DRIVEMODE_H
+#define MICROPY_INCLUDED_SHARED_BINDINGS_DIGITALIO_DRIVEMODE_H
+
+#include "py/obj.h"
+
+typedef enum {
+    DRIVE_MODE_PUSH_PULL,
+    DRIVE_MODE_OPEN_DRAIN
+} digitalio_drive_mode_t;
+
+typedef struct {
+    mp_obj_base_t base;
+} digitalio_drive_mode_obj_t;
+
+extern const mp_obj_type_t digitalio_drive_mode_type;
+
+extern const digitalio_drive_mode_obj_t digitalio_drive_mode_push_pull_obj;
+extern const digitalio_drive_mode_obj_t digitalio_drive_mode_open_drain_obj;
+
+#endif // MICROPY_INCLUDED_SHARED_BINDINGS_DIGITALIO_DRIVEMODE_H
diff --git a/circuitpython/shared-bindings/digitalio/Pull.c b/circuitpython/shared-bindings/digitalio/Pull.c
new file mode 100644
index 0000000..4db68dd
--- /dev/null
+++ b/circuitpython/shared-bindings/digitalio/Pull.c
@@ -0,0 +1,87 @@
+/*
+ * This file is part of the Micro Python project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2017 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/runtime.h"
+#include "shared-bindings/digitalio/Pull.h"
+
+//| class Pull:
+//|     """Defines the pull of a digital input pin"""
+//|
+//|     def __init__(self) -> None:
+//|         """Enum-like class to define the pull value, if any, used while reading
+//|         digital values in."""
+//|         ...
+//|
+//|     UP: Pull
+//|     """When the input line isn't being driven the pull up can pull the state
+//|     of the line high so it reads as true."""
+//|
+//|     DOWN: Pull
+//|     """When the input line isn't being driven the pull down can pull the
+//|     state of the line low so it reads as false."""
+//|
+const mp_obj_type_t digitalio_pull_type;
+
+const digitalio_pull_obj_t digitalio_pull_up_obj = {
+    { &digitalio_pull_type },
+};
+
+const digitalio_pull_obj_t digitalio_pull_down_obj = {
+    { &digitalio_pull_type },
+};
+
+STATIC const mp_rom_map_elem_t digitalio_pull_locals_dict_table[] = {
+    { MP_ROM_QSTR(MP_QSTR_UP),    MP_ROM_PTR(&digitalio_pull_up_obj) },
+    { MP_ROM_QSTR(MP_QSTR_DOWN),  MP_ROM_PTR(&digitalio_pull_down_obj) },
+};
+STATIC MP_DEFINE_CONST_DICT(digitalio_pull_locals_dict, digitalio_pull_locals_dict_table);
+
+STATIC void digitalio_pull_print(const mp_print_t *print, mp_obj_t self_in, mp_print_kind_t kind) {
+    qstr pull = MP_QSTR_UP;
+    if (self_in == MP_ROM_PTR(&digitalio_pull_down_obj)) {
+        pull = MP_QSTR_DOWN;
+    }
+    mp_printf(print, "%q.%q.%q", MP_QSTR_digitalio, MP_QSTR_Pull, pull);
+}
+
+const mp_obj_type_t digitalio_pull_type = {
+    { &mp_type_type },
+    .name = MP_QSTR_Pull,
+    .print = digitalio_pull_print,
+    .locals_dict = (mp_obj_dict_t *)&digitalio_pull_locals_dict,
+};
+
+digitalio_pull_t validate_pull(mp_rom_obj_t obj, qstr arg_name) {
+    if (obj == MP_ROM_PTR(&digitalio_pull_up_obj)) {
+        return PULL_UP;
+    } else if (obj == MP_ROM_PTR(&digitalio_pull_down_obj)) {
+        return PULL_DOWN;
+    }
+    if (obj == MP_ROM_NONE) {
+        return PULL_NONE;
+    }
+    mp_raise_TypeError_varg(translate("%q must be of type %q or None"), arg_name, MP_QSTR_Pull);
+}
diff --git a/circuitpython/shared-bindings/digitalio/Pull.h b/circuitpython/shared-bindings/digitalio/Pull.h
new file mode 100644
index 0000000..f4f6c42
--- /dev/null
+++ b/circuitpython/shared-bindings/digitalio/Pull.h
@@ -0,0 +1,48 @@
+/*
+ * This file is part of the Micro Python project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2017 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.
+ */
+
+#ifndef MICROPY_INCLUDED_SHARED_BINDINGS_DIGITALIO_PULL_H
+#define MICROPY_INCLUDED_SHARED_BINDINGS_DIGITALIO_PULL_H
+
+#include "py/obj.h"
+
+typedef enum _digitalio_pull_t {
+    PULL_NONE,
+    PULL_UP,
+    PULL_DOWN
+} digitalio_pull_t;
+
+extern const mp_obj_type_t digitalio_pull_type;
+
+typedef struct {
+    mp_obj_base_t base;
+} digitalio_pull_obj_t;
+extern const digitalio_pull_obj_t digitalio_pull_up_obj;
+extern const digitalio_pull_obj_t digitalio_pull_down_obj;
+
+digitalio_pull_t validate_pull(mp_rom_obj_t obj, qstr arg_name);
+
+#endif // MICROPY_INCLUDED_SHARED_BINDINGS_DIGITALIO_PULL_H
diff --git a/circuitpython/shared-bindings/digitalio/__init__.c b/circuitpython/shared-bindings/digitalio/__init__.c
new file mode 100644
index 0000000..9a9db69
--- /dev/null
+++ b/circuitpython/shared-bindings/digitalio/__init__.c
@@ -0,0 +1,100 @@
+/*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2016 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 <stdint.h>
+
+#include "py/obj.h"
+#include "py/runtime.h"
+
+#include "shared-bindings/microcontroller/Pin.h"
+#include "shared-bindings/digitalio/__init__.h"
+#include "shared-bindings/digitalio/DigitalInOut.h"
+#include "shared-bindings/digitalio/Direction.h"
+#include "shared-bindings/digitalio/DriveMode.h"
+#include "shared-bindings/digitalio/Pull.h"
+
+#include "py/runtime.h"
+
+//| """Basic digital pin support
+//|
+//| The `digitalio` module contains classes to provide access to basic digital IO.
+//|
+//| 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 digitalio
+//|   import board
+//|
+//|   pin = digitalio.DigitalInOut(board.LED)
+//|   print(pin.value)
+//|
+//| This example will initialize the the device, read
+//| :py:data:`~digitalio.DigitalInOut.value` and then
+//| :py:meth:`~digitalio.DigitalInOut.deinit` the hardware.
+//|
+//| Here is blinky::
+//|
+//|   import time
+//|   import digitalio
+//|   import board
+//|
+//|   led = digitalio.DigitalInOut(board.LED)
+//|   led.direction = digitalio.Direction.OUTPUT
+//|   while True:
+//|       led.value = True
+//|       time.sleep(0.1)
+//|       led.value = False
+//|       time.sleep(0.1)
+//|
+//| For the essentials of `digitalio`, see the `CircuitPython Essentials
+//| Learn guide <https://learn.adafruit.com/circuitpython-essentials/circuitpython-digital-in-out>`_
+//|
+//| For more information on using `digitalio`, see `this additional Learn guide
+//| <https://learn.adafruit.com/circuitpython-digital-inputs-and-outputs>`_
+//| """
+
+STATIC const mp_rom_map_elem_t digitalio_module_globals_table[] = {
+    { MP_ROM_QSTR(MP_QSTR___name__), MP_ROM_QSTR(MP_QSTR_digitalio) },
+    { MP_ROM_QSTR(MP_QSTR_DigitalInOut),  MP_ROM_PTR(&digitalio_digitalinout_type) },
+
+    // Enum-like Classes.
+    { MP_ROM_QSTR(MP_QSTR_Direction),          MP_ROM_PTR(&digitalio_direction_type) },
+    { MP_ROM_QSTR(MP_QSTR_DriveMode),          MP_ROM_PTR(&digitalio_drive_mode_type) },
+    { MP_ROM_QSTR(MP_QSTR_Pull),               MP_ROM_PTR(&digitalio_pull_type) },
+};
+
+STATIC MP_DEFINE_CONST_DICT(digitalio_module_globals, digitalio_module_globals_table);
+
+const mp_obj_module_t digitalio_module = {
+    .base = { &mp_type_module },
+    .globals = (mp_obj_dict_t *)&digitalio_module_globals,
+};
+
+MP_REGISTER_MODULE(MP_QSTR_digitalio, digitalio_module, CIRCUITPY_DIGITALIO);
diff --git a/circuitpython/shared-bindings/digitalio/__init__.h b/circuitpython/shared-bindings/digitalio/__init__.h
new file mode 100644
index 0000000..8ab7f78
--- /dev/null
+++ b/circuitpython/shared-bindings/digitalio/__init__.h
@@ -0,0 +1,34 @@
+/*
+ * 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.
+ */
+
+#ifndef MICROPY_INCLUDED_SHARED_BINDINGS_DIGITALIO___INIT___H
+#define MICROPY_INCLUDED_SHARED_BINDINGS_DIGITALIO___INIT___H
+
+#include "py/obj.h"
+
+// Nothing now.
+
+#endif  // MICROPY_INCLUDED_SHARED_BINDINGS_DIGITALIO___INIT___H