machine_adc.c

/*
 * This file is part of the MicroPython project, http://micropython.org/
 *
 * The MIT License (MIT)
 *
 * Copyright (c) 2015 Josef Gajdusek
 *
 * 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 <stdio.h>
#include <string.h>

#include "py/runtime.h"
#include "py/mphal.h"
#include "user_interface.h"

typedef struct _machine_adc_obj_t {
    mp_obj_base_t base;
    bool isvdd;
} machine_adc_obj_t;

extern const mp_obj_type_t machine_adc_type;

STATIC machine_adc_obj_t machine_adc_vdd3 = {{&machine_adc_type}, true};
STATIC machine_adc_obj_t machine_adc_adc = {{&machine_adc_type}, false};

STATIC uint16_t adc_read(machine_adc_obj_t *self) {
    if (self->isvdd) {
        return system_get_vdd33();
    } else {
        return system_adc_read();
    }
}
void machine_adc_print(const mp_print_t *print, mp_obj_t self_in, mp_print_kind_t kind) {
    machine_adc_obj_t *self = MP_OBJ_TO_PTR(self_in);
    mp_printf(print, "ADC(%u)", self->isvdd);
}

mp_obj_t machine_adc_make_new(const mp_obj_type_t *type_in, size_t n_args, size_t n_kw, const mp_obj_t *args) {
    mp_arg_check_num(n_args, n_kw, 1, 1, false);

    mp_int_t chn = mp_obj_get_int(args[0]);

    switch (chn) {
        case 0:
            return &machine_adc_adc;
        case 1:
            return &machine_adc_vdd3;
        default:
            mp_raise_msg_varg(&mp_type_ValueError, MP_ERROR_TEXT("ADC(%d) doesn't exist"), chn);
    }
}

// read_u16()
STATIC mp_obj_t machine_adc_read_u16(mp_obj_t self_in) {
    machine_adc_obj_t *self = MP_OBJ_TO_PTR(self_in);
    uint32_t value = adc_read(self);
    return MP_OBJ_NEW_SMALL_INT(value * 65535 / 1024);
}
STATIC MP_DEFINE_CONST_FUN_OBJ_1(machine_adc_read_u16_obj, machine_adc_read_u16);

// Legacy method
STATIC mp_obj_t machine_adc_read(mp_obj_t self_in) {
    machine_adc_obj_t *self = MP_OBJ_TO_PTR(self_in);
    return mp_obj_new_int(adc_read(self));
}
STATIC MP_DEFINE_CONST_FUN_OBJ_1(machine_adc_read_obj, machine_adc_read);

STATIC const mp_rom_map_elem_t machine_adc_locals_dict_table[] = {
    { MP_ROM_QSTR(MP_QSTR_read_u16), MP_ROM_PTR(&machine_adc_read_u16_obj) },
    { MP_ROM_QSTR(MP_QSTR_read), MP_ROM_PTR(&machine_adc_read_obj) }
};
STATIC MP_DEFINE_CONST_DICT(machine_adc_locals_dict, machine_adc_locals_dict_table);

MP_DEFINE_CONST_OBJ_TYPE(
    machine_adc_type,
    MP_QSTR_ADC,
    MP_TYPE_FLAG_NONE,
    make_new, machine_adc_make_new,
    print, machine_adc_print,
    locals_dict, &machine_adc_locals_dict
    );