205 lines
7.2 KiB
C
205 lines
7.2 KiB
C
/*
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* This file is part of the MicroPython project, http://micropython.org/
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*
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* The MIT License (MIT)
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*
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* Copyright (c) 2017 Nick Moore
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include <stdio.h>
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#include "esp_log.h"
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#include "driver/gpio.h"
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#include "driver/adc.h"
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#include "py/runtime.h"
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#include "py/mphal.h"
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#include "modmachine.h"
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typedef struct _madc_obj_t {
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mp_obj_base_t base;
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gpio_num_t gpio_id;
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adc1_channel_t adc1_id;
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} madc_obj_t;
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STATIC const madc_obj_t madc_obj[] = {
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#if CONFIG_IDF_TARGET_ESP32
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{{&machine_adc_type}, GPIO_NUM_36, ADC1_CHANNEL_0},
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{{&machine_adc_type}, GPIO_NUM_37, ADC1_CHANNEL_1},
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{{&machine_adc_type}, GPIO_NUM_38, ADC1_CHANNEL_2},
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{{&machine_adc_type}, GPIO_NUM_39, ADC1_CHANNEL_3},
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{{&machine_adc_type}, GPIO_NUM_32, ADC1_CHANNEL_4},
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{{&machine_adc_type}, GPIO_NUM_33, ADC1_CHANNEL_5},
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{{&machine_adc_type}, GPIO_NUM_34, ADC1_CHANNEL_6},
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{{&machine_adc_type}, GPIO_NUM_35, ADC1_CHANNEL_7},
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#elif CONFIG_IDF_TARGET_ESP32S2 || CONFIG_IDF_TARGET_ESP32S3
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{{&machine_adc_type}, GPIO_NUM_1, ADC1_CHANNEL_0},
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{{&machine_adc_type}, GPIO_NUM_2, ADC1_CHANNEL_1},
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{{&machine_adc_type}, GPIO_NUM_3, ADC1_CHANNEL_2},
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{{&machine_adc_type}, GPIO_NUM_4, ADC1_CHANNEL_3},
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{{&machine_adc_type}, GPIO_NUM_5, ADC1_CHANNEL_4},
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{{&machine_adc_type}, GPIO_NUM_6, ADC1_CHANNEL_5},
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{{&machine_adc_type}, GPIO_NUM_7, ADC1_CHANNEL_6},
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{{&machine_adc_type}, GPIO_NUM_8, ADC1_CHANNEL_7},
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{{&machine_adc_type}, GPIO_NUM_9, ADC1_CHANNEL_8},
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{{&machine_adc_type}, GPIO_NUM_10, ADC1_CHANNEL_9},
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#endif
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};
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STATIC uint8_t adc_bit_width;
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STATIC mp_obj_t madc_make_new(const mp_obj_type_t *type, size_t n_args, size_t n_kw,
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const mp_obj_t *args) {
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static int initialized = 0;
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if (!initialized) {
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#if CONFIG_IDF_TARGET_ESP32S2
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adc1_config_width(ADC_WIDTH_BIT_13);
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#else
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adc1_config_width(ADC_WIDTH_BIT_12);
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#endif
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adc_bit_width = 12;
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initialized = 1;
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}
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mp_arg_check_num(n_args, n_kw, 1, 1, true);
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gpio_num_t pin_id = machine_pin_get_id(args[0]);
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const madc_obj_t *self = NULL;
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for (int i = 0; i < MP_ARRAY_SIZE(madc_obj); i++) {
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if (pin_id == madc_obj[i].gpio_id) {
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self = &madc_obj[i];
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break;
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}
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}
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if (!self) {
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mp_raise_ValueError(MP_ERROR_TEXT("invalid Pin for ADC"));
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}
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esp_err_t err = adc1_config_channel_atten(self->adc1_id, ADC_ATTEN_0db);
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if (err == ESP_OK) {
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return MP_OBJ_FROM_PTR(self);
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}
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mp_raise_ValueError(MP_ERROR_TEXT("parameter error"));
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}
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STATIC void madc_print(const mp_print_t *print, mp_obj_t self_in, mp_print_kind_t kind) {
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madc_obj_t *self = self_in;
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mp_printf(print, "ADC(Pin(%u))", self->gpio_id);
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}
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// read_u16()
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STATIC mp_obj_t madc_read_u16(mp_obj_t self_in) {
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madc_obj_t *self = MP_OBJ_TO_PTR(self_in);
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uint32_t raw = adc1_get_raw(self->adc1_id);
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// Scale raw reading to 16 bit value using a Taylor expansion (for 8 <= bits <= 16)
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uint32_t u16 = raw << (16 - adc_bit_width) | raw >> (2 * adc_bit_width - 16);
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return MP_OBJ_NEW_SMALL_INT(u16);
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}
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STATIC MP_DEFINE_CONST_FUN_OBJ_1(madc_read_u16_obj, madc_read_u16);
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// Legacy method
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STATIC mp_obj_t madc_read(mp_obj_t self_in) {
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madc_obj_t *self = self_in;
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int val = adc1_get_raw(self->adc1_id);
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if (val == -1) {
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mp_raise_ValueError(MP_ERROR_TEXT("parameter error"));
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}
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return MP_OBJ_NEW_SMALL_INT(val);
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}
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MP_DEFINE_CONST_FUN_OBJ_1(madc_read_obj, madc_read);
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STATIC mp_obj_t madc_atten(mp_obj_t self_in, mp_obj_t atten_in) {
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madc_obj_t *self = self_in;
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adc_atten_t atten = mp_obj_get_int(atten_in);
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esp_err_t err = adc1_config_channel_atten(self->adc1_id, atten);
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if (err == ESP_OK) {
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return mp_const_none;
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}
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mp_raise_ValueError(MP_ERROR_TEXT("parameter error"));
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}
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MP_DEFINE_CONST_FUN_OBJ_2(madc_atten_obj, madc_atten);
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STATIC mp_obj_t madc_width(mp_obj_t cls_in, mp_obj_t width_in) {
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adc_bits_width_t width = mp_obj_get_int(width_in);
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esp_err_t err = adc1_config_width(width);
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if (err != ESP_OK) {
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mp_raise_ValueError(MP_ERROR_TEXT("parameter error"));
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}
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switch (width) {
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#if CONFIG_IDF_TARGET_ESP32
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case ADC_WIDTH_9Bit:
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adc_bit_width = 9;
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break;
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case ADC_WIDTH_10Bit:
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adc_bit_width = 10;
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break;
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case ADC_WIDTH_11Bit:
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adc_bit_width = 11;
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break;
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case ADC_WIDTH_12Bit:
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adc_bit_width = 12;
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break;
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#elif CONFIG_IDF_TARGET_ESP32S2 || CONFIG_IDF_TARGET_ESP32S3
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case ADC_WIDTH_BIT_13:
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adc_bit_width = 13;
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break;
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#endif
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default:
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break;
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}
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return mp_const_none;
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}
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MP_DEFINE_CONST_FUN_OBJ_2(madc_width_fun_obj, madc_width);
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MP_DEFINE_CONST_CLASSMETHOD_OBJ(madc_width_obj, MP_ROM_PTR(&madc_width_fun_obj));
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STATIC const mp_rom_map_elem_t madc_locals_dict_table[] = {
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{ MP_ROM_QSTR(MP_QSTR_read_u16), MP_ROM_PTR(&madc_read_u16_obj) },
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{ MP_ROM_QSTR(MP_QSTR_read), MP_ROM_PTR(&madc_read_obj) },
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{ MP_ROM_QSTR(MP_QSTR_atten), MP_ROM_PTR(&madc_atten_obj) },
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{ MP_ROM_QSTR(MP_QSTR_width), MP_ROM_PTR(&madc_width_obj) },
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{ MP_ROM_QSTR(MP_QSTR_ATTN_0DB), MP_ROM_INT(ADC_ATTEN_0db) },
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{ MP_ROM_QSTR(MP_QSTR_ATTN_2_5DB), MP_ROM_INT(ADC_ATTEN_2_5db) },
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{ MP_ROM_QSTR(MP_QSTR_ATTN_6DB), MP_ROM_INT(ADC_ATTEN_6db) },
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{ MP_ROM_QSTR(MP_QSTR_ATTN_11DB), MP_ROM_INT(ADC_ATTEN_11db) },
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#if CONFIG_IDF_TARGET_ESP32
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{ MP_ROM_QSTR(MP_QSTR_WIDTH_9BIT), MP_ROM_INT(ADC_WIDTH_9Bit) },
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{ MP_ROM_QSTR(MP_QSTR_WIDTH_10BIT), MP_ROM_INT(ADC_WIDTH_10Bit) },
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{ MP_ROM_QSTR(MP_QSTR_WIDTH_11BIT), MP_ROM_INT(ADC_WIDTH_11Bit) },
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{ MP_ROM_QSTR(MP_QSTR_WIDTH_12BIT), MP_ROM_INT(ADC_WIDTH_12Bit) },
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#elif CONFIG_IDF_TARGET_ESP32S2 || CONFIG_IDF_TARGET_ESP32S3
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{ MP_ROM_QSTR(MP_QSTR_WIDTH_13BIT), MP_ROM_INT(ADC_WIDTH_BIT_13) },
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#endif
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};
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STATIC MP_DEFINE_CONST_DICT(madc_locals_dict, madc_locals_dict_table);
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const mp_obj_type_t machine_adc_type = {
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{ &mp_type_type },
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.name = MP_QSTR_ADC,
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.print = madc_print,
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.make_new = madc_make_new,
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.locals_dict = (mp_obj_t)&madc_locals_dict,
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};
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