add circuitpython code

4 files changed, 464 insertions, 0 deletions

diff --git a/circuitpython/shared-bindings/pwmio/PWMOut.c b/circuitpython/shared-bindings/pwmio/PWMOut.c
new file mode 100644
index 0000000..60a9dfb
--- /dev/null
+++ b/circuitpython/shared-bindings/pwmio/PWMOut.c
@@ -0,0 +1,284 @@
+/*
+ * This file is part of the Micro Python project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * SPDX-FileCopyrightText: Copyright (c) 2016 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 "shared/runtime/context_manager_helpers.h"
+#include "py/objproperty.h"
+#include "py/runtime.h"
+
+#include "shared-bindings/microcontroller/Pin.h"
+#include "shared-bindings/pwmio/PWMOut.h"
+#include "shared-bindings/util.h"
+#include "supervisor/shared/translate.h"
+
+
+void common_hal_pwmio_pwmout_raise_error(pwmout_result_t result) {
+    switch (result) {
+        case PWMOUT_OK:
+            break;
+        case PWMOUT_INVALID_PIN:
+            mp_raise_ValueError(translate("Invalid pin"));
+            break;
+        case PWMOUT_INVALID_FREQUENCY:
+            mp_raise_ValueError(translate("Invalid PWM frequency"));
+            break;
+        case PWMOUT_INVALID_FREQUENCY_ON_PIN:
+            mp_raise_ValueError(translate("Frequency must match existing PWMOut using this timer"));
+            break;
+        case PWMOUT_VARIABLE_FREQUENCY_NOT_AVAILABLE:
+            mp_raise_ValueError(translate("Cannot vary frequency on a timer that is already in use"));
+            break;
+        case PWMOUT_ALL_TIMERS_ON_PIN_IN_USE:
+            mp_raise_ValueError(translate("All timers for this pin are in use"));
+            break;
+        case PWMOUT_ALL_TIMERS_IN_USE:
+            mp_raise_RuntimeError(translate("All timers in use"));
+            break;
+        case PWMOUT_ALL_CHANNELS_IN_USE:
+            mp_raise_RuntimeError(translate("All channels in use"));
+            break;
+        default:
+        case PWMOUT_INITIALIZATION_ERROR:
+            mp_raise_RuntimeError(translate("Could not start PWM"));
+            break;
+    }
+}
+
+//| class PWMOut:
+//|     """Output a Pulse Width Modulated signal on a given pin."""
+//|
+//|     def __init__(self, pin: microcontroller.Pin, *, duty_cycle: int = 0, frequency: int = 500, variable_frequency: bool = False) -> None:
+//|         """Create a PWM object associated with the given pin. This allows you to
+//|         write PWM signals out on the given pin. Frequency is fixed after init
+//|         unless ``variable_frequency`` is True.
+//|
+//|         .. note:: When ``variable_frequency`` is True, further PWM outputs may be
+//|           limited because it may take more internal resources to be flexible. So,
+//|           when outputting both fixed and flexible frequency signals construct the
+//|           fixed outputs first.
+//|
+//|         :param ~microcontroller.Pin pin: The pin to output to
+//|         :param int duty_cycle: The fraction of each pulse which is high. 16-bit
+//|         :param int frequency: The target frequency in Hertz (32-bit)
+//|         :param bool variable_frequency: True if the frequency will change over time
+//|
+//|
+//|         Simple LED on::
+//|
+//|           import pwmio
+//|           import board
+//|
+//|           pwm = pwmio.PWMOut(board.LED)
+//|
+//|           while True:
+//|               pwm.duty_cycle = 2 ** 15  # Cycles the pin with 50% duty cycle (half of 2 ** 16) at the default 500hz
+//|
+//|         PWM LED fade::
+//|
+//|           import pwmio
+//|           import board
+//|
+//|           pwm = pwmio.PWMOut(board.LED)  # output on LED pin with default of 500Hz
+//|
+//|           while True:
+//|               for cycle in range(0, 65535):  # Cycles through the full PWM range from 0 to 65535
+//|                   pwm.duty_cycle = cycle  # Cycles the LED pin duty cycle through the range of values
+//|               for cycle in range(65534, 0, -1):  # Cycles through the PWM range backwards from 65534 to 0
+//|                   pwm.duty_cycle = cycle  # Cycles the LED pin duty cycle through the range of values
+//|
+//|         PWM at specific frequency (servos and motors)::
+//|
+//|           import pwmio
+//|           import board
+//|
+//|           pwm = pwmio.PWMOut(board.D13, frequency=50)
+//|           pwm.duty_cycle = 2 ** 15  # Cycles the pin with 50% duty cycle (half of 2 ** 16) at 50hz
+//|
+//|         Variable frequency (usually tones)::
+//|
+//|           import pwmio
+//|           import board
+//|           import time
+//|
+//|           pwm = pwmio.PWMOut(board.D13, duty_cycle=2 ** 15, frequency=440, variable_frequency=True)
+//|           time.sleep(0.2)
+//|           pwm.frequency = 880
+//|           time.sleep(0.1)"""
+//|         ...
+//|
+STATIC mp_obj_t pwmio_pwmout_make_new(const mp_obj_type_t *type, size_t n_args, size_t n_kw, const mp_obj_t *args) {
+    enum { ARG_pin, ARG_duty_cycle, ARG_frequency, ARG_variable_frequency };
+    static const mp_arg_t allowed_args[] = {
+        { MP_QSTR_pin, MP_ARG_REQUIRED | MP_ARG_OBJ, },
+        { MP_QSTR_duty_cycle, MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = 0} },
+        { MP_QSTR_frequency, MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = 500} },
+        { MP_QSTR_variable_frequency, MP_ARG_KW_ONLY | MP_ARG_BOOL, {.u_bool = false} },
+    };
+    mp_arg_val_t parsed_args[MP_ARRAY_SIZE(allowed_args)];
+    mp_arg_parse_all_kw_array(n_args, n_kw, args, MP_ARRAY_SIZE(allowed_args), allowed_args, parsed_args);
+
+    const mcu_pin_obj_t *pin = validate_obj_is_free_pin(parsed_args[ARG_pin].u_obj);
+
+    uint16_t duty_cycle = parsed_args[ARG_duty_cycle].u_int;
+    uint32_t frequency = parsed_args[ARG_frequency].u_int;
+    bool variable_frequency = parsed_args[ARG_variable_frequency].u_bool;
+
+    // create PWM object from the given pin
+    pwmio_pwmout_obj_t *self = m_new_obj(pwmio_pwmout_obj_t);
+    self->base.type = &pwmio_pwmout_type;
+    pwmout_result_t result = common_hal_pwmio_pwmout_construct(self, pin, duty_cycle, frequency, variable_frequency);
+    common_hal_pwmio_pwmout_raise_error(result);
+
+    return MP_OBJ_FROM_PTR(self);
+}
+
+//|     def deinit(self) -> None:
+//|         """Deinitialises the PWMOut and releases any hardware resources for reuse."""
+//|         ...
+//|
+STATIC mp_obj_t pwmio_pwmout_deinit(mp_obj_t self_in) {
+    pwmio_pwmout_obj_t *self = MP_OBJ_TO_PTR(self_in);
+    common_hal_pwmio_pwmout_deinit(self);
+    return mp_const_none;
+}
+STATIC MP_DEFINE_CONST_FUN_OBJ_1(pwmio_pwmout_deinit_obj, pwmio_pwmout_deinit);
+
+STATIC void check_for_deinit(pwmio_pwmout_obj_t *self) {
+    if (common_hal_pwmio_pwmout_deinited(self)) {
+        raise_deinited_error();
+    }
+}
+
+//|     def __enter__(self) -> PWMOut:
+//|         """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 pwmio_pwmout_obj___exit__(size_t n_args, const mp_obj_t *args) {
+    (void)n_args;
+    common_hal_pwmio_pwmout_deinit(args[0]);
+    return mp_const_none;
+}
+STATIC MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(pwmio_pwmout___exit___obj, 4, 4, pwmio_pwmout_obj___exit__);
+
+//|     duty_cycle: int
+//|     """16 bit value that dictates how much of one cycle is high (1) versus low
+//|     (0). 0xffff will always be high, 0 will always be low and 0x7fff will
+//|     be half high and then half low.
+//|
+//|     Depending on how PWM is implemented on a specific board, the internal
+//|     representation for duty cycle might have less than 16 bits of resolution.
+//|     Reading this property will return the value from the internal representation,
+//|     so it may differ from the value set."""
+//|
+STATIC mp_obj_t pwmio_pwmout_obj_get_duty_cycle(mp_obj_t self_in) {
+    pwmio_pwmout_obj_t *self = MP_OBJ_TO_PTR(self_in);
+    check_for_deinit(self);
+    return MP_OBJ_NEW_SMALL_INT(common_hal_pwmio_pwmout_get_duty_cycle(self));
+}
+MP_DEFINE_CONST_FUN_OBJ_1(pwmio_pwmout_get_duty_cycle_obj, pwmio_pwmout_obj_get_duty_cycle);
+
+STATIC mp_obj_t pwmio_pwmout_obj_set_duty_cycle(mp_obj_t self_in, mp_obj_t duty_cycle) {
+    pwmio_pwmout_obj_t *self = MP_OBJ_TO_PTR(self_in);
+    check_for_deinit(self);
+    mp_int_t duty = mp_obj_get_int(duty_cycle);
+    if (duty < 0 || duty > 0xffff) {
+        mp_raise_ValueError(translate("PWM duty_cycle must be between 0 and 65535 inclusive (16 bit resolution)"));
+    }
+    common_hal_pwmio_pwmout_set_duty_cycle(self, duty);
+    return mp_const_none;
+}
+MP_DEFINE_CONST_FUN_OBJ_2(pwmio_pwmout_set_duty_cycle_obj, pwmio_pwmout_obj_set_duty_cycle);
+
+MP_PROPERTY_GETSET(pwmio_pwmout_duty_cycle_obj,
+    (mp_obj_t)&pwmio_pwmout_get_duty_cycle_obj,
+    (mp_obj_t)&pwmio_pwmout_set_duty_cycle_obj);
+
+//|     frequency: int
+//|     """32 bit value that dictates the PWM frequency in Hertz (cycles per
+//|     second). Only writeable when constructed with ``variable_frequency=True``.
+//|
+//|     Depending on how PWM is implemented on a specific board, the internal value
+//|     for the PWM's duty cycle may need to be recalculated when the frequency
+//|     changes. In these cases, the duty cycle is automatically recalculated
+//|     from the original duty cycle value. This should happen without any need
+//|     to manually re-set the duty cycle."""
+//|
+STATIC mp_obj_t pwmio_pwmout_obj_get_frequency(mp_obj_t self_in) {
+    pwmio_pwmout_obj_t *self = MP_OBJ_TO_PTR(self_in);
+    check_for_deinit(self);
+    return MP_OBJ_NEW_SMALL_INT(common_hal_pwmio_pwmout_get_frequency(self));
+}
+MP_DEFINE_CONST_FUN_OBJ_1(pwmio_pwmout_get_frequency_obj, pwmio_pwmout_obj_get_frequency);
+
+STATIC mp_obj_t pwmio_pwmout_obj_set_frequency(mp_obj_t self_in, mp_obj_t frequency) {
+    pwmio_pwmout_obj_t *self = MP_OBJ_TO_PTR(self_in);
+    check_for_deinit(self);
+    if (!common_hal_pwmio_pwmout_get_variable_frequency(self)) {
+        mp_raise_AttributeError(translate(
+            "PWM frequency not writable when variable_frequency is False on "
+            "construction."));
+    }
+    mp_int_t freq = mp_obj_get_int(frequency);
+    if (freq == 0) {
+        mp_raise_ValueError(translate("Invalid PWM frequency"));
+    }
+    common_hal_pwmio_pwmout_set_frequency(self, freq);
+    return mp_const_none;
+}
+MP_DEFINE_CONST_FUN_OBJ_2(pwmio_pwmout_set_frequency_obj, pwmio_pwmout_obj_set_frequency);
+
+MP_PROPERTY_GETSET(pwmio_pwmout_frequency_obj,
+    (mp_obj_t)&pwmio_pwmout_get_frequency_obj,
+    (mp_obj_t)&pwmio_pwmout_set_frequency_obj);
+
+STATIC const mp_rom_map_elem_t pwmio_pwmout_locals_dict_table[] = {
+    // Methods
+    { MP_ROM_QSTR(MP_QSTR_deinit), MP_ROM_PTR(&pwmio_pwmout_deinit_obj) },
+    { MP_ROM_QSTR(MP_QSTR___enter__), MP_ROM_PTR(&default___enter___obj) },
+    { MP_ROM_QSTR(MP_QSTR___exit__), MP_ROM_PTR(&pwmio_pwmout___exit___obj) },
+
+    // Properties
+    { MP_ROM_QSTR(MP_QSTR_duty_cycle), MP_ROM_PTR(&pwmio_pwmout_duty_cycle_obj) },
+    { MP_ROM_QSTR(MP_QSTR_frequency), MP_ROM_PTR(&pwmio_pwmout_frequency_obj) },
+    // TODO(tannewt): Add enabled to determine whether the signal is output
+    // without giving up the resources. Useful for IR output.
+};
+STATIC MP_DEFINE_CONST_DICT(pwmio_pwmout_locals_dict, pwmio_pwmout_locals_dict_table);
+
+const mp_obj_type_t pwmio_pwmout_type = {
+    { &mp_type_type },
+    .name = MP_QSTR_PWMOut,
+    .make_new = pwmio_pwmout_make_new,
+    .locals_dict = (mp_obj_dict_t *)&pwmio_pwmout_locals_dict,
+};
diff --git a/circuitpython/shared-bindings/pwmio/PWMOut.h b/circuitpython/shared-bindings/pwmio/PWMOut.h
new file mode 100644
index 0000000..e55205e
--- /dev/null
+++ b/circuitpython/shared-bindings/pwmio/PWMOut.h
@@ -0,0 +1,67 @@
+/*
+ * 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_PWMIO_PWMOUT_H
+#define MICROPY_INCLUDED_SHARED_BINDINGS_PWMIO_PWMOUT_H
+
+#include "common-hal/microcontroller/Pin.h"
+#include "common-hal/pwmio/PWMOut.h"
+
+extern const mp_obj_type_t pwmio_pwmout_type;
+
+typedef enum pwmout_result_t {
+    PWMOUT_OK,
+    PWMOUT_INVALID_PIN,
+    PWMOUT_INVALID_FREQUENCY,
+    PWMOUT_INVALID_FREQUENCY_ON_PIN,
+    PWMOUT_VARIABLE_FREQUENCY_NOT_AVAILABLE,
+    PWMOUT_ALL_TIMERS_ON_PIN_IN_USE,
+    PWMOUT_ALL_TIMERS_IN_USE,
+    PWMOUT_ALL_CHANNELS_IN_USE,
+    PWMOUT_INITIALIZATION_ERROR,
+} pwmout_result_t;
+
+extern pwmout_result_t common_hal_pwmio_pwmout_construct(pwmio_pwmout_obj_t *self,
+    const mcu_pin_obj_t *pin, uint16_t duty, uint32_t frequency,
+    bool variable_frequency);
+extern void common_hal_pwmio_pwmout_deinit(pwmio_pwmout_obj_t *self);
+extern bool common_hal_pwmio_pwmout_deinited(pwmio_pwmout_obj_t *self);
+extern void common_hal_pwmio_pwmout_set_duty_cycle(pwmio_pwmout_obj_t *self, uint16_t duty);
+extern uint16_t common_hal_pwmio_pwmout_get_duty_cycle(pwmio_pwmout_obj_t *self);
+extern void common_hal_pwmio_pwmout_set_frequency(pwmio_pwmout_obj_t *self, uint32_t frequency);
+extern uint32_t common_hal_pwmio_pwmout_get_frequency(pwmio_pwmout_obj_t *self);
+extern bool common_hal_pwmio_pwmout_get_variable_frequency(pwmio_pwmout_obj_t *self);
+
+// Don't use this! It is only used internally for backwards compatibility.
+extern const mcu_pin_obj_t *common_hal_pwmio_pwmout_get_pin(pwmio_pwmout_obj_t *self);
+
+// This is used by the supervisor to claim PWMOut devices indefinitely.
+extern void common_hal_pwmio_pwmout_never_reset(pwmio_pwmout_obj_t *self);
+extern void common_hal_pwmio_pwmout_reset_ok(pwmio_pwmout_obj_t *self);
+
+extern void common_hal_pwmio_pwmout_raise_error(pwmout_result_t result);
+
+#endif // MICROPY_INCLUDED_SHARED_BINDINGS_PWMIO_PWMOUT_H
diff --git a/circuitpython/shared-bindings/pwmio/__init__.c b/circuitpython/shared-bindings/pwmio/__init__.c
new file mode 100644
index 0000000..90aff45
--- /dev/null
+++ b/circuitpython/shared-bindings/pwmio/__init__.c
@@ -0,0 +1,79 @@
+/*
+ * 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/pwmio/__init__.h"
+#include "shared-bindings/pwmio/PWMOut.h"
+
+//| """Support for PWM based protocols
+//|
+//| The `pwmio` module contains classes to provide access to basic pulse 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 time
+//|   import pwmio
+//|   import board
+//|
+//|   pwm = pwmio.PWMOut(board.LED)
+//|   pwm.duty_cycle = 2 ** 15
+//|   time.sleep(0.1)
+//|
+//| This example will initialize the the device, set
+//| :py:data:`~pwmio.PWMOut.duty_cycle`, and then sleep 0.1 seconds.
+//| CircuitPython will automatically turn off the PWM when it resets all
+//| hardware after program completion. Use ``deinit()`` or a ``with`` statement
+//| to do it yourself.
+//|
+//| For the essentials of `pwmio`, see the `CircuitPython Essentials
+//| Learn guide <https://learn.adafruit.com/circuitpython-essentials/circuitpython-pwm>`_.
+//| """
+//|
+
+STATIC const mp_rom_map_elem_t pwmio_module_globals_table[] = {
+    { MP_ROM_QSTR(MP_QSTR___name__), MP_ROM_QSTR(MP_QSTR_pwmio) },
+    { MP_ROM_QSTR(MP_QSTR_PWMOut), MP_ROM_PTR(&pwmio_pwmout_type) },
+};
+
+STATIC MP_DEFINE_CONST_DICT(pwmio_module_globals, pwmio_module_globals_table);
+
+const mp_obj_module_t pwmio_module = {
+    .base = { &mp_type_module },
+    .globals = (mp_obj_dict_t *)&pwmio_module_globals,
+};
+
+MP_REGISTER_MODULE(MP_QSTR_pwmio, pwmio_module, CIRCUITPY_PWMIO);
diff --git a/circuitpython/shared-bindings/pwmio/__init__.h b/circuitpython/shared-bindings/pwmio/__init__.h
new file mode 100644
index 0000000..93c7037
--- /dev/null
+++ b/circuitpython/shared-bindings/pwmio/__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_PWMIO___INIT___H
+#define MICROPY_INCLUDED_SHARED_BINDINGS_PWMIO___INIT___H
+
+#include "py/obj.h"
+
+// Nothing now.
+
+#endif  // MICROPY_INCLUDED_SHARED_BINDINGS_PWMIO___INIT___H