circuitpython/shared-bindings/pulseio/PulseOut.c

/*
 * 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"
#include "shared-bindings/util.h"
#include "supervisor/shared/translate.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 PWMout object.
//|
//|   :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
//|
//|     # 50% duty cycle at 38kHz.
//|     pwm = pulseio.PWMOut(board.D13, frequency=38000, duty_cycle=32768)
//|     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, const mp_obj_t *args, mp_map_t *kw_args) {
    mp_arg_check_num(n_args, kw_args, 1, 1, false);
    mp_obj_t carrier_obj = args[0];

    if (!MP_OBJ_IS_TYPE(carrier_obj, &pulseio_pwmout_type)) {
        mp_raise_TypeError_varg(translate("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. See
//|      :ref:`lifetime-and-contextmanagers` for more info.
//|
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);
    if (common_hal_pulseio_pulseout_deinited(self)) {
        raise_deinited_error();
    }

    mp_buffer_info_t bufinfo;
    mp_get_buffer_raise(pulses, &bufinfo, MP_BUFFER_READ);
    if (bufinfo.typecode != 'H') {
        mp_raise_TypeError(translate("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,
};