Split up nativeio.0.9.4

This was done to allow greatly granularity when deciding what functionality
is built into each board's build. For example, this way pulseio can be
omitted to allow for something else such as touchio.

8 files changed, 910 insertions, 0 deletions

diff --git a/shared-bindings/pulseio/PWMOut.c b/shared-bindings/pulseio/PWMOut.c
new file mode 100644
index 000000000..73f3bfd3e
--- /dev/null
+++ b/shared-bindings/pulseio/PWMOut.c
@@ -0,0 +1,221 @@
+/*
+ * This file is part of the Micro Python project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * 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 "lib/utils/context_manager_helpers.h"
+#include "py/objproperty.h"
+#include "py/runtime.h"
+#include "shared-bindings/microcontroller/Pin.h"
+#include "shared-bindings/pulseio/PWMOut.h"
+
+//| .. currentmodule:: pulseio
+//|
+//| :class:`PWMOut` -- Output a Pulse Width Modulated signal
+//| ========================================================
+//|
+//| PWMOut can be used to output a PWM signal on a given pin.
+//|
+//| .. class:: PWMOut(pin, \*, duty_cycle=0, frequency=500, variable_frequency=False)
+//|
+//|   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: 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 fade::
+//|
+//|     import pulseio
+//|     import board
+//|
+//|     with pulseio.PWMOut(board.D13) as pwm:     # output on D13
+//|       pwm.duty_cycle = 2 ** 15                  # Cycles the pin with 50% duty cycle (half of 2 ** 16) at the default 500hz
+//|
+//|   PWM at specific frequency (servos and motors)::
+//|
+//|     import pulseio
+//|     import board
+//|
+//|     with pulseio.PWMOut(board.D13, frequency=50) as pwm:
+//|       pwm.duty_cycle = 2 ** 15                  # Cycles the pin with 50% duty cycle (half of 2 ** 16) at 50hz
+//|
+//|   Variable frequency (usually tones)::
+//|
+//|     import pulseio
+//|     import board
+//|     import time
+//|
+//|     with pulseio.PWMOut(board.D13, duty_cycle=2 ** 15, frequency=440, variable_frequency=True) as pwm:
+//|       time.sleep(0.2)
+//|       pwm.frequency = 880
+//|       time.sleep(0.1)
+//|
+STATIC mp_obj_t pulseio_pwmout_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, MP_OBJ_FUN_ARGS_MAX, true);
+    mp_obj_t pin_obj = args[0];
+    assert_pin(pin_obj, false);
+    const mcu_pin_obj_t *pin = MP_OBJ_TO_PTR(pin_obj);
+    assert_pin_free(pin);
+
+    // create PWM object from the given pin
+    pulseio_pwmout_obj_t *self = m_new_obj(pulseio_pwmout_obj_t);
+    self->base.type = &pulseio_pwmout_type;
+
+    mp_map_t kw_args;
+    mp_map_init_fixed_table(&kw_args, n_kw, args + n_args);
+    enum { ARG_duty_cycle, ARG_frequency, ARG_variable_frequency };
+    static const mp_arg_t allowed_args[] = {
+        { 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(n_args - 1, args + 1, &kw_args, MP_ARRAY_SIZE(allowed_args), allowed_args, parsed_args);
+    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_int;
+
+    common_hal_pulseio_pwmout_construct(self, pin, duty_cycle, frequency, variable_frequency);
+
+    return MP_OBJ_FROM_PTR(self);
+}
+
+//|   .. method:: deinit()
+//|
+//|      Deinitialises the PWMOut and releases any hardware resources for reuse.
+//|
+STATIC mp_obj_t pulseio_pwmout_deinit(mp_obj_t self_in) {
+    pulseio_pwmout_obj_t *self = MP_OBJ_TO_PTR(self_in);
+    common_hal_pulseio_pwmout_deinit(self);
+    return mp_const_none;
+}
+STATIC MP_DEFINE_CONST_FUN_OBJ_1(pulseio_pwmout_deinit_obj, pulseio_pwmout_deinit);
+
+//|   .. method:: __enter__()
+//|
+//|      No-op used by Context Managers.
+//|
+//  Provided by context manager helper.
+
+//|   .. method:: __exit__()
+//|
+//|      Automatically deinitializes the hardware when exiting a context.
+//|
+STATIC mp_obj_t pulseio_pwmout_obj___exit__(size_t n_args, const mp_obj_t *args) {
+    (void)n_args;
+    common_hal_pulseio_pwmout_deinit(args[0]);
+    return mp_const_none;
+}
+STATIC MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(pulseio_pwmout___exit___obj, 4, 4, pulseio_pwmout_obj___exit__);
+
+//|   .. attribute:: duty_cycle
+//|
+//|      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.
+STATIC mp_obj_t pulseio_pwmout_obj_get_duty_cycle(mp_obj_t self_in) {
+   pulseio_pwmout_obj_t *self = MP_OBJ_TO_PTR(self_in);
+   return MP_OBJ_NEW_SMALL_INT(common_hal_pulseio_pwmout_get_duty_cycle(self));
+}
+MP_DEFINE_CONST_FUN_OBJ_1(pulseio_pwmout_get_duty_cycle_obj, pulseio_pwmout_obj_get_duty_cycle);
+
+STATIC mp_obj_t pulseio_pwmout_obj_set_duty_cycle(mp_obj_t self_in, mp_obj_t duty_cycle) {
+    pulseio_pwmout_obj_t *self = MP_OBJ_TO_PTR(self_in);
+    mp_int_t duty = mp_obj_get_int(duty_cycle);
+    if (duty < 0 || duty > 0xffff) {
+        mp_raise_ValueError("PWM duty must be between 0 and 65536 (16 bit resolution)");
+    }
+   common_hal_pulseio_pwmout_set_duty_cycle(self, duty);
+   return mp_const_none;
+}
+MP_DEFINE_CONST_FUN_OBJ_2(pulseio_pwmout_set_duty_cycle_obj, pulseio_pwmout_obj_set_duty_cycle);
+
+const mp_obj_property_t pulseio_pwmout_duty_cycle_obj = {
+    .base.type = &mp_type_property,
+    .proxy = {(mp_obj_t)&pulseio_pwmout_get_duty_cycle_obj,
+              (mp_obj_t)&pulseio_pwmout_set_duty_cycle_obj,
+              (mp_obj_t)&mp_const_none_obj},
+};
+
+//|   .. attribute:: frequency
+//|
+//|     32 bit value that dictates the PWM frequency in Hertz (cycles per
+//|     second). Only writeable when constructed with ``variable_frequency=True``.
+//|
+STATIC mp_obj_t pulseio_pwmout_obj_get_frequency(mp_obj_t self_in) {
+   pulseio_pwmout_obj_t *self = MP_OBJ_TO_PTR(self_in);
+   return MP_OBJ_NEW_SMALL_INT(common_hal_pulseio_pwmout_get_frequency(self));
+}
+MP_DEFINE_CONST_FUN_OBJ_1(pulseio_pwmout_get_frequency_obj, pulseio_pwmout_obj_get_frequency);
+
+STATIC mp_obj_t pulseio_pwmout_obj_set_frequency(mp_obj_t self_in, mp_obj_t frequency) {
+    pulseio_pwmout_obj_t *self = MP_OBJ_TO_PTR(self_in);
+    if (!common_hal_pulseio_pwmout_get_variable_frequency(self)) {
+        mp_raise_AttributeError(
+            "PWM frequency not writeable when variable_frequency is False on "
+            "construction.");
+    }
+   common_hal_pulseio_pwmout_set_frequency(self, mp_obj_get_int(frequency));
+   return mp_const_none;
+}
+MP_DEFINE_CONST_FUN_OBJ_2(pulseio_pwmout_set_frequency_obj, pulseio_pwmout_obj_set_frequency);
+
+const mp_obj_property_t pulseio_pwmout_frequency_obj = {
+    .base.type = &mp_type_property,
+    .proxy = {(mp_obj_t)&pulseio_pwmout_get_frequency_obj,
+              (mp_obj_t)&pulseio_pwmout_set_frequency_obj,
+              (mp_obj_t)&mp_const_none_obj},
+};
+
+STATIC const mp_rom_map_elem_t pulseio_pwmout_locals_dict_table[] = {
+    // Methods
+    { MP_ROM_QSTR(MP_QSTR_deinit), MP_ROM_PTR(&pulseio_pwmout_deinit_obj) },
+    { MP_ROM_QSTR(MP_QSTR___enter__), MP_ROM_PTR(&default___enter___obj) },
+    { MP_ROM_QSTR(MP_QSTR___exit__), MP_ROM_PTR(&pulseio_pwmout___exit___obj) },
+
+    // Properties
+    { MP_ROM_QSTR(MP_QSTR_duty_cycle), MP_ROM_PTR(&pulseio_pwmout_duty_cycle_obj) },
+    { MP_ROM_QSTR(MP_QSTR_frequency), MP_ROM_PTR(&pulseio_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(pulseio_pwmout_locals_dict, pulseio_pwmout_locals_dict_table);
+
+const mp_obj_type_t pulseio_pwmout_type = {
+    { &mp_type_type },
+    .name = MP_QSTR_PWMOut,
+    .make_new = pulseio_pwmout_make_new,
+    .locals_dict = (mp_obj_dict_t*)&pulseio_pwmout_locals_dict,
+};
diff --git a/shared-bindings/pulseio/PWMOut.h b/shared-bindings/pulseio/PWMOut.h
new file mode 100644
index 000000000..f7a0bff22
--- /dev/null
+++ b/shared-bindings/pulseio/PWMOut.h
@@ -0,0 +1,45 @@
+/*
+ * This file is part of the Micro Python project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * 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_PULSEIO_PWMOUT_H__
+#define __MICROPY_INCLUDED_SHARED_BINDINGS_PULSEIO_PWMOUT_H__
+
+#include "common-hal/microcontroller/types.h"
+#include "common-hal/pulseio/PWMOut.h"
+
+extern const mp_obj_type_t pulseio_pwmout_type;
+
+extern void common_hal_pulseio_pwmout_construct(pulseio_pwmout_obj_t* self,
+    const mcu_pin_obj_t* pin, uint16_t duty, uint32_t frequency,
+    bool variable_frequency);
+extern void common_hal_pulseio_pwmout_deinit(pulseio_pwmout_obj_t* self);
+extern void common_hal_pulseio_pwmout_set_duty_cycle(pulseio_pwmout_obj_t* self, uint16_t duty);
+extern uint16_t common_hal_pulseio_pwmout_get_duty_cycle(pulseio_pwmout_obj_t* self);
+extern void common_hal_pulseio_pwmout_set_frequency(pulseio_pwmout_obj_t* self, uint32_t frequency);
+extern uint32_t common_hal_pulseio_pwmout_get_frequency(pulseio_pwmout_obj_t* self);
+extern bool common_hal_pulseio_pwmout_get_variable_frequency(pulseio_pwmout_obj_t* self);
+
+#endif // __MICROPY_INCLUDED_SHARED_BINDINGS_PULSEIO_PWMOUT_H__
diff --git a/shared-bindings/pulseio/PulseIn.c b/shared-bindings/pulseio/PulseIn.c
new file mode 100644
index 000000000..e87020cd9
--- /dev/null
+++ b/shared-bindings/pulseio/PulseIn.c
@@ -0,0 +1,285 @@
+/*
+ * 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 "lib/utils/context_manager_helpers.h"
+#include "py/objproperty.h"
+#include "py/runtime.h"
+#include "py/runtime0.h"
+#include "shared-bindings/microcontroller/Pin.h"
+#include "shared-bindings/pulseio/PulseIn.h"
+
+//| .. currentmodule:: pulseio
+//|
+//| :class:`PulseIn` -- Read a series of pulse durations
+//| ========================================================
+//|
+//| PulseIn is used to measure a series of active and idle pulses. This is
+//| commonly used in infrared receivers and low cost temperature sensors (DHT).
+//| The pulsed signal consists of timed active and idle periods. Unlike PWM,
+//| there is no set duration for active and idle pairs.
+//|
+//| .. class:: PulseIn(pin, maxlen=2, \*, idle_state=False)
+//|
+//|   Create a PulseIn object associated with the given pin. The object acts as
+//|   a read-only sequence of pulse lengths with a given max length. When it is
+//|   active, new pulse lengths are added to the end of the list. When there is
+//|   no more room (len() == `maxlen`) the oldest pulse length is removed to
+//|   make room.
+//|
+//|   :param ~microcontroller.Pin pin: Pin to read pulses from.
+//|   :param int maxlen: Maximum number of pulse durations to store at once
+//|   :param bool idle_state: Idle state of the pin. At start and after `resume`
+//|     the first recorded pulse will the opposite state from idle.
+//|
+//|   Read a short series of pulses::
+//|
+//|     import pulseio
+//|     import board
+//|
+//|     with pulseio.PulseIn(board.D7) as pulses:
+//|         # Wait for an active pulse
+//|         while len(pulses) == 0:
+//|             pass
+//|         # Pause while we do something with the pulses
+//|         pulses.pause()
+//|
+//|         # Print the pulses. pulses[0] is an active pulse unless the length
+//|         # reached max length and idle pulses are recorded.
+//|         print(pulses)
+//|
+//|         # Clear the rest
+//|         pulse_in.clear()
+//|
+//|         # Resume with an 80 microsecond active pulse
+//|         pulse_in.resume(80)
+//|
+STATIC mp_obj_t pulseio_pulsein_make_new(const mp_obj_type_t *type, size_t n_args, size_t n_kw, const mp_obj_t *pos_args) {
+    mp_arg_check_num(n_args, n_kw, 1, MP_OBJ_FUN_ARGS_MAX, true);
+    mp_map_t kw_args;
+    mp_map_init_fixed_table(&kw_args, n_kw, pos_args + n_args);
+    enum { ARG_pin, ARG_maxlen, ARG_idle_state };
+    static const mp_arg_t allowed_args[] = {
+        { MP_QSTR_pin, MP_ARG_REQUIRED | MP_ARG_OBJ },
+        { MP_QSTR_maxlen, MP_ARG_INT, {.u_int = 2} },
+        { MP_QSTR_idle_state, MP_ARG_BOOL, {.u_bool = false} },
+    };
+    mp_arg_val_t args[MP_ARRAY_SIZE(allowed_args)];
+    mp_arg_parse_all(n_args, pos_args, &kw_args, MP_ARRAY_SIZE(allowed_args), allowed_args, args);
+    assert_pin(args[ARG_pin].u_obj, false);
+    const mcu_pin_obj_t* pin = MP_OBJ_TO_PTR(args[ARG_pin].u_obj);
+    assert_pin_free(pin);
+
+    pulseio_pulsein_obj_t *self = m_new_obj(pulseio_pulsein_obj_t);
+    self->base.type = &pulseio_pulsein_type;
+
+    common_hal_pulseio_pulsein_construct(self, pin, args[ARG_maxlen].u_int,
+        args[ARG_idle_state].u_bool);
+
+    return MP_OBJ_FROM_PTR(self);
+}
+
+//|   .. method:: deinit()
+//|
+//|      Deinitialises the PulseIn and releases any hardware resources for reuse.
+//|
+STATIC mp_obj_t pulseio_pulsein_deinit(mp_obj_t self_in) {
+    pulseio_pulsein_obj_t *self = MP_OBJ_TO_PTR(self_in);
+    common_hal_pulseio_pulsein_deinit(self);
+    return mp_const_none;
+}
+STATIC MP_DEFINE_CONST_FUN_OBJ_1(pulseio_pulsein_deinit_obj, pulseio_pulsein_deinit);
+
+//|   .. method:: __enter__()
+//|
+//|      No-op used by Context Managers.
+//|
+//  Provided by context manager helper.
+
+//|   .. method:: __exit__()
+//|
+//|      Automatically deinitializes the hardware when exiting a context.
+//|
+STATIC mp_obj_t pulseio_pulsein_obj___exit__(size_t n_args, const mp_obj_t *args) {
+    (void)n_args;
+    common_hal_pulseio_pulsein_deinit(args[0]);
+    return mp_const_none;
+}
+STATIC MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(pulseio_pulsein___exit___obj, 4, 4, pulseio_pulsein_obj___exit__);
+
+//|   .. method:: pause()
+//|
+//|     Pause pulse capture
+//|
+STATIC mp_obj_t pulseio_pulsein_obj_pause(mp_obj_t self_in) {
+    pulseio_pulsein_obj_t *self = MP_OBJ_TO_PTR(self_in);
+
+    common_hal_pulseio_pulsein_pause(self);
+    return mp_const_none;
+}
+MP_DEFINE_CONST_FUN_OBJ_1(pulseio_pulsein_pause_obj, pulseio_pulsein_obj_pause);
+
+//|   .. method:: resume(trigger_duration=0)
+//|
+//|     Resumes pulse capture after an optional trigger pulse.
+//|
+//|     .. warning:: Using trigger pulse with a device that drives both high and
+//|       low signals risks a short. Make sure your device is open drain (only
+//|       drives low) when using a trigger pulse. You most likely added a
+//|       "pull-up" resistor to your circuit to do this.
+//|
+//|     :param int trigger_duration: trigger pulse duration in microseconds
+//|
+STATIC mp_obj_t pulseio_pulsein_obj_resume(mp_obj_t self_in, mp_obj_t duration_obj) {
+    pulseio_pulsein_obj_t *self = MP_OBJ_TO_PTR(self_in);
+    uint16_t trigger_duration = 0;
+    if (MP_OBJ_IS_SMALL_INT(duration_obj)) {
+        trigger_duration = MP_OBJ_SMALL_INT_VALUE(duration_obj);
+    } else if (duration_obj != mp_const_none) {
+        mp_raise_TypeError("trigger_duration must be int");
+    }
+
+    common_hal_pulseio_pulsein_resume(self, trigger_duration);
+    return mp_const_none;
+}
+MP_DEFINE_CONST_FUN_OBJ_2(pulseio_pulsein_resume_obj, pulseio_pulsein_obj_resume);
+
+//|   .. method:: clear()
+//|
+//|     Clears all captured pulses
+//|
+STATIC mp_obj_t pulseio_pulsein_obj_clear(mp_obj_t self_in) {
+    pulseio_pulsein_obj_t *self = MP_OBJ_TO_PTR(self_in);
+
+    common_hal_pulseio_pulsein_clear(self);
+    return mp_const_none;
+}
+MP_DEFINE_CONST_FUN_OBJ_1(pulseio_pulsein_clear_obj, pulseio_pulsein_obj_clear);
+
+//|   .. method:: popleft()
+//|
+//|     Removes and returns the oldest read pulse.
+//|
+STATIC mp_obj_t pulseio_pulsein_obj_popleft(mp_obj_t self_in) {
+    pulseio_pulsein_obj_t *self = MP_OBJ_TO_PTR(self_in);
+    return MP_OBJ_NEW_SMALL_INT(common_hal_pulseio_pulsein_popleft(self));
+}
+MP_DEFINE_CONST_FUN_OBJ_1(pulseio_pulsein_popleft_obj, pulseio_pulsein_obj_popleft);
+
+//|   .. attribute:: maxlen
+//|
+//|     Returns the maximum length of the PulseIn. When len() is equal to maxlen,
+//|     it is unclear which pulses are active and which are idle.
+//|
+STATIC mp_obj_t pulseio_pulsein_obj_get_maxlen(mp_obj_t self_in) {
+    pulseio_pulsein_obj_t *self = MP_OBJ_TO_PTR(self_in);
+    return MP_OBJ_NEW_SMALL_INT(common_hal_pulseio_pulsein_get_maxlen(self));
+}
+MP_DEFINE_CONST_FUN_OBJ_1(pulseio_pulsein_get_maxlen_obj, pulseio_pulsein_obj_get_maxlen);
+
+const mp_obj_property_t pulseio_pulsein_maxlen_obj = {
+    .base.type = &mp_type_property,
+    .proxy = {(mp_obj_t)&pulseio_pulsein_get_maxlen_obj,
+              (mp_obj_t)&mp_const_none_obj,
+              (mp_obj_t)&mp_const_none_obj},
+};
+
+//|   .. method:: __len__()
+//|
+//|     Returns the current pulse length
+//|
+//|     This allows you to::
+//|
+//|       pulses = pulseio.PulseIn(pin)
+//|       print(len(pulses))
+//|
+STATIC mp_obj_t pulsein_unary_op(mp_uint_t op, mp_obj_t self_in) {
+    pulseio_pulsein_obj_t *self = MP_OBJ_TO_PTR(self_in);
+    uint16_t len = common_hal_pulseio_pulsein_get_len(self);
+    switch (op) {
+        case MP_UNARY_OP_BOOL: return mp_obj_new_bool(len != 0);
+        case MP_UNARY_OP_LEN: return MP_OBJ_NEW_SMALL_INT(len);
+        default: return MP_OBJ_NULL; // op not supported
+    }
+}
+
+//|   .. method:: __get__(index)
+//|
+//|     Returns the value at the given index or values in slice.
+//|
+//|     This allows you to::
+//|
+//|       pulses = pulseio.PulseIn(pin)
+//|       print(pulses[0])
+//|
+STATIC mp_obj_t pulsein_subscr(mp_obj_t self_in, mp_obj_t index_obj, mp_obj_t value) {
+    if (value == mp_const_none) {
+        // delete item
+        mp_raise_AttributeError("Cannot delete values");
+    } else {
+        pulseio_pulsein_obj_t *self = MP_OBJ_TO_PTR(self_in);
+        if (MP_OBJ_IS_TYPE(index_obj, &mp_type_slice)) {
+            mp_raise_NotImplementedError("Slices not supported");
+        } else {
+            uint16_t index = 0;
+            if (MP_OBJ_IS_SMALL_INT(index_obj)) {
+                index = MP_OBJ_SMALL_INT_VALUE(index_obj);
+            } else {
+                mp_raise_TypeError("index must be int");
+            }
+            if (value == MP_OBJ_SENTINEL) {
+                // load
+                return MP_OBJ_NEW_SMALL_INT(common_hal_pulseio_pulsein_get_item(self, index));
+            } else {
+                mp_raise_AttributeError("Read-only");
+            }
+        }
+    }
+    return mp_const_none;
+}
+
+STATIC const mp_rom_map_elem_t pulseio_pulsein_locals_dict_table[] = {
+    // Methods
+    { MP_ROM_QSTR(MP_QSTR_deinit), MP_ROM_PTR(&pulseio_pulsein_deinit_obj) },
+    { MP_ROM_QSTR(MP_QSTR___enter__), MP_ROM_PTR(&default___enter___obj) },
+    { MP_ROM_QSTR(MP_QSTR___exit__), MP_ROM_PTR(&pulseio_pulsein___exit___obj) },
+    { MP_ROM_QSTR(MP_QSTR_pause), MP_ROM_PTR(&pulseio_pulsein_pause_obj) },
+    { MP_ROM_QSTR(MP_QSTR_resume), MP_ROM_PTR(&pulseio_pulsein_resume_obj) },
+    { MP_ROM_QSTR(MP_QSTR_clear), MP_ROM_PTR(&pulseio_pulsein_clear_obj) },
+    { MP_ROM_QSTR(MP_QSTR_popleft), MP_ROM_PTR(&pulseio_pulsein_popleft_obj) },
+    { MP_ROM_QSTR(MP_QSTR_maxlen), MP_ROM_PTR(&pulseio_pulsein_maxlen_obj) },
+};
+STATIC MP_DEFINE_CONST_DICT(pulseio_pulsein_locals_dict, pulseio_pulsein_locals_dict_table);
+
+const mp_obj_type_t pulseio_pulsein_type = {
+    { &mp_type_type },
+    .name = MP_QSTR_PulseIn,
+    .make_new = pulseio_pulsein_make_new,
+    .subscr = pulsein_subscr,
+    .unary_op = pulsein_unary_op,
+    .locals_dict = (mp_obj_dict_t*)&pulseio_pulsein_locals_dict,
+};
diff --git a/shared-bindings/pulseio/PulseIn.h b/shared-bindings/pulseio/PulseIn.h
new file mode 100644
index 000000000..5ffab1d67
--- /dev/null
+++ b/shared-bindings/pulseio/PulseIn.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_PULSEIO_PULSEIN_H__
+#define __MICROPY_INCLUDED_SHARED_BINDINGS_PULSEIO_PULSEIN_H__
+
+#include "common-hal/microcontroller/types.h"
+#include "common-hal/pulseio/PulseIn.h"
+
+extern const mp_obj_type_t pulseio_pulsein_type;
+
+extern void common_hal_pulseio_pulsein_construct(pulseio_pulsein_obj_t* self,
+    const mcu_pin_obj_t* pin, uint16_t maxlen, bool idle_state);
+extern void common_hal_pulseio_pulsein_deinit(pulseio_pulsein_obj_t* self);
+extern void common_hal_pulseio_pulsein_pause(pulseio_pulsein_obj_t* self);
+extern void common_hal_pulseio_pulsein_resume(pulseio_pulsein_obj_t* self, uint16_t trigger_duration);
+extern void common_hal_pulseio_pulsein_clear(pulseio_pulsein_obj_t* self);
+extern uint16_t common_hal_pulseio_pulsein_popleft(pulseio_pulsein_obj_t* self);
+extern uint16_t common_hal_pulseio_pulsein_get_maxlen(pulseio_pulsein_obj_t* self);
+extern uint16_t common_hal_pulseio_pulsein_get_len(pulseio_pulsein_obj_t* self);
+extern uint16_t common_hal_pulseio_pulsein_get_item(pulseio_pulsein_obj_t* self, int16_t index);
+
+#endif // __MICROPY_INCLUDED_SHARED_BINDINGS_PULSEIO_PULSEIN_H__
diff --git a/shared-bindings/pulseio/PulseOut.c b/shared-bindings/pulseio/PulseOut.c
new file mode 100644
index 000000000..20e04e8fb
--- /dev/null
+++ b/shared-bindings/pulseio/PulseOut.c
@@ -0,0 +1,150 @@
+/*
+ * 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 "lib/utils/context_manager_helpers.h"
+#include "py/objproperty.h"
+#include "py/runtime.h"
+#include "shared-bindings/microcontroller/Pin.h"
+#include "shared-bindings/pulseio/PulseOut.h"
+#include "shared-bindings/pulseio/PWMOut.h"
+
+//| .. currentmodule:: pulseio
+//|
+//| :class:`PulseOut` -- Output a pulse train
+//| ========================================================
+//|
+//| PulseOut is used to pulse PWM "carrier" output on and off. This is commonly
+//| used in infrared remotes. The pulsed signal consists of timed on and off
+//| periods. Unlike PWM, there is no set duration for on and off pairs.
+//|
+//| .. class:: PulseOut(carrier)
+//|
+//|   Create a PulseOut object associated with the given PWM out experience.
+//|
+//|   :param ~pulseio.PWMOut carrier: PWMOut that is set to output on the desired pin.
+//|
+//|   Send a short series of pulses::
+//|
+//|     import array
+//|     import pulseio
+//|     import board
+//|
+//|     with pulseio.PWMOut(board.D13, duty_cycle=2 ** 15) as pwm:
+//|         pulse = pulseio.PulseOut(pwm)
+//|         #                             on   off     on     off   on
+//|         pulses = array.array('h', [65000, 1000, 65000, 65000, 1000])
+//|         pulse.send(pulses)
+//|
+//|         # Modify the array of pulses.
+//|         pulses[0] = 200
+//|         pulse.send(pulses)
+//|
+STATIC mp_obj_t pulseio_pulseout_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, true);
+    mp_obj_t carrier_obj = args[0];
+
+    if (!MP_OBJ_IS_TYPE(carrier_obj, &pulseio_pwmout_type)) {
+        nlr_raise(mp_obj_new_exception_msg_varg(&mp_type_TypeError, "Expected a %q", pulseio_pwmout_type.name));
+    }
+
+    // create Pulse object from the given pin
+    pulseio_pulseout_obj_t *self = m_new_obj(pulseio_pulseout_obj_t);
+    self->base.type = &pulseio_pulseout_type;
+
+    common_hal_pulseio_pulseout_construct(self, (pulseio_pwmout_obj_t *)MP_OBJ_TO_PTR(carrier_obj));
+
+    return MP_OBJ_FROM_PTR(self);
+}
+
+//|   .. method:: deinit()
+//|
+//|      Deinitialises the PulseOut and releases any hardware resources for reuse.
+//|
+STATIC mp_obj_t pulseio_pulseout_deinit(mp_obj_t self_in) {
+    pulseio_pulseout_obj_t *self = MP_OBJ_TO_PTR(self_in);
+    common_hal_pulseio_pulseout_deinit(self);
+    return mp_const_none;
+}
+STATIC MP_DEFINE_CONST_FUN_OBJ_1(pulseio_pulseout_deinit_obj, pulseio_pulseout_deinit);
+
+//|   .. method:: __enter__()
+//|
+//|      No-op used by Context Managers.
+//|
+//  Provided by context manager helper.
+
+//|   .. method:: __exit__()
+//|
+//|      Automatically deinitializes the hardware when exiting a context.
+//|
+STATIC mp_obj_t pulseio_pulseout_obj___exit__(size_t n_args, const mp_obj_t *args) {
+    (void)n_args;
+    common_hal_pulseio_pulseout_deinit(args[0]);
+    return mp_const_none;
+}
+STATIC MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(pulseio_pulseout___exit___obj, 4, 4, pulseio_pulseout_obj___exit__);
+
+//|   .. method:: send(pulses)
+//|
+//|     Pulse alternating on and off durations in microseconds starting with on.
+//|     ``pulses`` must be an `array.array` with data type 'H' for unsigned
+//|     halfword (two bytes).
+//|
+//|     This method waits until the whole array of pulses has been sent and
+//|     ensures the signal is off afterwards.
+//|
+//|     :param array.array pulses: pulse durations in microseconds
+//|
+STATIC mp_obj_t pulseio_pulseout_obj_send(mp_obj_t self_in, mp_obj_t pulses) {
+    pulseio_pulseout_obj_t *self = MP_OBJ_TO_PTR(self_in);
+
+    mp_buffer_info_t bufinfo;
+    mp_get_buffer_raise(pulses, &bufinfo, MP_BUFFER_READ);
+    if (bufinfo.typecode != 'H') {
+        mp_raise_TypeError("Array must contain halfwords (type 'H')");
+    }
+    common_hal_pulseio_pulseout_send(self, (uint16_t *)bufinfo.buf, bufinfo.len / 2);
+    return mp_const_none;
+}
+MP_DEFINE_CONST_FUN_OBJ_2(pulseio_pulseout_send_obj, pulseio_pulseout_obj_send);
+
+STATIC const mp_rom_map_elem_t pulseio_pulseout_locals_dict_table[] = {
+    // Methods
+    { MP_ROM_QSTR(MP_QSTR_deinit), MP_ROM_PTR(&pulseio_pulseout_deinit_obj) },
+    { MP_ROM_QSTR(MP_QSTR___enter__), MP_ROM_PTR(&default___enter___obj) },
+    { MP_ROM_QSTR(MP_QSTR___exit__), MP_ROM_PTR(&pulseio_pulseout___exit___obj) },
+    { MP_ROM_QSTR(MP_QSTR_send), MP_ROM_PTR(&pulseio_pulseout_send_obj) },
+};
+STATIC MP_DEFINE_CONST_DICT(pulseio_pulseout_locals_dict, pulseio_pulseout_locals_dict_table);
+
+const mp_obj_type_t pulseio_pulseout_type = {
+    { &mp_type_type },
+    .name = MP_QSTR_PulseOut,
+    .make_new = pulseio_pulseout_make_new,
+    .locals_dict = (mp_obj_dict_t*)&pulseio_pulseout_locals_dict,
+};
diff --git a/shared-bindings/pulseio/PulseOut.h b/shared-bindings/pulseio/PulseOut.h
new file mode 100644
index 000000000..5365fd1f5
--- /dev/null
+++ b/shared-bindings/pulseio/PulseOut.h
@@ -0,0 +1,42 @@
+/*
+ * This file is part of the Micro Python project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * 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_PULSEIO_PULSEOUT_H__
+#define __MICROPY_INCLUDED_SHARED_BINDINGS_PULSEIO_PULSEOUT_H__
+
+#include "common-hal/microcontroller/types.h"
+#include "common-hal/pulseio/PulseOut.h"
+#include "common-hal/pulseio/PWMOut.h"
+
+extern const mp_obj_type_t pulseio_pulseout_type;
+
+extern void common_hal_pulseio_pulseout_construct(pulseio_pulseout_obj_t* self,
+    const pulseio_pwmout_obj_t* carrier);
+extern void common_hal_pulseio_pulseout_deinit(pulseio_pulseout_obj_t* self);
+extern void common_hal_pulseio_pulseout_send(pulseio_pulseout_obj_t* self,
+    uint16_t* pulses, uint16_t len);
+
+#endif // __MICROPY_INCLUDED_SHARED_BINDINGS_PULSEIO_PULSEOUT_H__
diff --git a/shared-bindings/pulseio/__init__.c b/shared-bindings/pulseio/__init__.c
new file mode 100644
index 000000000..27d978ec5
--- /dev/null
+++ b/shared-bindings/pulseio/__init__.c
@@ -0,0 +1,87 @@
+/*
+ * 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/pulseio/__init__.h"
+#include "shared-bindings/pulseio/PulseIn.h"
+#include "shared-bindings/pulseio/PulseOut.h"
+#include "shared-bindings/pulseio/PWMOut.h"
+
+//| :mod:`pulseio` --- Support for pulse based protocols
+//| =================================================
+//|
+//| .. module:: pulseio
+//|   :synopsis: Support for pulse based protocols
+//|   :platform: SAMD21, ESP8266
+//|
+//| The `pulseio` module contains classes to provide access to basic pulse IO.
+//|
+//| Libraries
+//|
+//| .. toctree::
+//|     :maxdepth: 3
+//|
+//|     PulseIn
+//|     PulseOut
+//|     PWMOut
+//|
+//| All libraries change hardware state and should be deinitialized when they
+//| are no longer needed. To do so, either call :py:meth:`!deinit` or use a
+//| context manager.
+//|
+//| For example::
+//|
+//|   import pulseio
+//|   import time
+//|   from board import *
+//|
+//|   with pulseio.PWMOut(D13) as pin:
+//|     pin.duty_cycle = 2 ** 15
+//|     time.sleep(0.1)
+//|
+//| This example will initialize the the device, set
+//| :py:data:`~pulseio.PWMOut.duty_cycle`, sleep 0.1 seconds and then
+//| :py:meth:`~pulseio.PWMOut.deinit` the hardware.
+//|
+
+STATIC const mp_rom_map_elem_t pulseio_module_globals_table[] = {
+    { MP_ROM_QSTR(MP_QSTR___name__), MP_ROM_QSTR(MP_QSTR_pulseio) },
+    { MP_ROM_QSTR(MP_QSTR_PulseIn), MP_ROM_PTR(&pulseio_pulsein_type) },
+    { MP_ROM_QSTR(MP_QSTR_PulseOut), MP_ROM_PTR(&pulseio_pulseout_type) },
+    { MP_ROM_QSTR(MP_QSTR_PWMOut), MP_ROM_PTR(&pulseio_pwmout_type) },
+};
+
+STATIC MP_DEFINE_CONST_DICT(pulseio_module_globals, pulseio_module_globals_table);
+
+const mp_obj_module_t pulseio_module = {
+    .base = { &mp_type_module },
+    .globals = (mp_obj_dict_t*)&pulseio_module_globals,
+};
diff --git a/shared-bindings/pulseio/__init__.h b/shared-bindings/pulseio/__init__.h
new file mode 100644
index 000000000..26bb9f7b4
--- /dev/null
+++ b/shared-bindings/pulseio/__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_PULSEIO___INIT___H__
+#define __MICROPY_INCLUDED_SHARED_BINDINGS_PULSEIO___INIT___H__
+
+#include "py/obj.h"
+
+// Nothing now.
+
+#endif  // __MICROPY_INCLUDED_SHARED_BINDINGS_PULSEIO___INIT___H__