circuitpython/shared-bindings/nativeio/AnalogIn.c

/*
 * 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.
 */

#include <string.h>

#include "py/binary.h"
#include "py/mphal.h"
#include "py/nlr.h"
#include "py/objproperty.h"
#include "py/runtime.h"
#include "shared-bindings/microcontroller/Pin.h"
#include "shared-bindings/nativeio/AnalogIn.h"

//| .. currentmodule:: nativeio
//|
//| :class:`AnalogIn` -- read analog voltage
//| ============================================
//|
//| Usage::
//|
//|    import nativeio
//|    from board import *
//|
//|    with nativeio.AnalogIn(A1) as adc:
//|      val = adc.value
//|

//| .. class:: AnalogIn(pin)
//|
//|   Use the AnalogIn on the given pin.
//|
//|   :param ~microcontroller.Pin pin: the pin to read from
//|
STATIC mp_obj_t nativeio_analogin_make_new(const mp_obj_type_t *type,
        mp_uint_t n_args, mp_uint_t n_kw, const mp_obj_t *args) {
    // check number of arguments
    mp_arg_check_num(n_args, n_kw, 1, 1, false);

    // 1st argument is the pin
    mp_obj_t pin_obj = args[0];
    assert_pin(pin_obj, false);

    nativeio_analogin_obj_t *self = m_new_obj(nativeio_analogin_obj_t);
    self->base.type = &nativeio_analogin_type;
    const mcu_pin_obj_t *pin = MP_OBJ_TO_PTR(pin_obj);
    common_hal_nativeio_analogin_construct(self, pin);

    return (mp_obj_t) self;
}

//|   .. attribute:: value
//|
//|     Read the value on the analog pin and return it.  The returned value
//|     will be between 0 and 65535 inclusive (16-bit). Even if the underlying
//|     analog to digital converter (ADC) is lower resolution, the result will
//|     be scaled to be 16-bit.
//|
//|     :return: the data read
//|     :rtype: int
//|
STATIC mp_obj_t nativeio_analogin_obj_get_value(mp_obj_t self_in) {
   nativeio_analogin_obj_t *self = MP_OBJ_TO_PTR(self_in);
   return MP_OBJ_NEW_SMALL_INT(common_hal_nativeio_analogin_get_value(self));
}
MP_DEFINE_CONST_FUN_OBJ_1(nativeio_analogin_get_value_obj, nativeio_analogin_obj_get_value);

mp_obj_property_t nativeio_analogin_value_obj = {
    .base.type = &mp_type_property,
    .proxy = {(mp_obj_t)&nativeio_analogin_get_value_obj,
              (mp_obj_t)&mp_const_none_obj,
              (mp_obj_t)&mp_const_none_obj},
};

STATIC const mp_rom_map_elem_t nativeio_analogin_locals_dict_table[] = {
    { MP_OBJ_NEW_QSTR(MP_QSTR_value), MP_ROM_PTR(&nativeio_analogin_value_obj)},
};

STATIC MP_DEFINE_CONST_DICT(nativeio_analogin_locals_dict, nativeio_analogin_locals_dict_table);

const mp_obj_type_t nativeio_analogin_type = {
    { &mp_type_type },
    .name = MP_QSTR_AnalogIn,
    .make_new = nativeio_analogin_make_new,
    .locals_dict = (mp_obj_t)&nativeio_analogin_locals_dict,
};