-
-
Notifications
You must be signed in to change notification settings - Fork 7.4k
/
machine_adc.c
234 lines (205 loc) · 10.1 KB
/
machine_adc.c
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
/*
* This file is part of the MicroPython project, http://micropython.org/
*
* The MIT License (MIT)
*
* Copyright (c) 2017 Nick Moore
* Copyright (c) 2021 Jonathan Hogg
*
* 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.
*/
// This file is never compiled standalone, it's included directly from
// extmod/machine_adc.c via MICROPY_PY_MACHINE_ADC_INCLUDEFILE.
#include "py/mphal.h"
#include "adc.h"
#include "driver/adc.h"
#define ADCBLOCK1 (&madcblock_obj[0])
#define ADCBLOCK2 (&madcblock_obj[1])
#if CONFIG_IDF_TARGET_ESP32
#define MICROPY_PY_MACHINE_ADC_CLASS_CONSTANTS_WIDTH_9_10_11 \
{ MP_ROM_QSTR(MP_QSTR_WIDTH_9BIT), MP_ROM_INT(9) }, \
{ MP_ROM_QSTR(MP_QSTR_WIDTH_10BIT), MP_ROM_INT(10) }, \
{ MP_ROM_QSTR(MP_QSTR_WIDTH_11BIT), MP_ROM_INT(11) },
#else
#define MICROPY_PY_MACHINE_ADC_CLASS_CONSTANTS_WIDTH_9_10_11
#endif
#if CONFIG_IDF_TARGET_ESP32 || CONFIG_IDF_TARGET_ESP32C3 || CONFIG_IDF_TARGET_ESP32S3
#define MICROPY_PY_MACHINE_ADC_CLASS_CONSTANTS_WIDTH_12 \
{ MP_ROM_QSTR(MP_QSTR_WIDTH_12BIT), MP_ROM_INT(12) },
#else
#define MICROPY_PY_MACHINE_ADC_CLASS_CONSTANTS_WIDTH_12
#endif
#if CONFIG_IDF_TARGET_ESP32S2
#define MICROPY_PY_MACHINE_ADC_CLASS_CONSTANTS_WIDTH_13 \
{ MP_ROM_QSTR(MP_QSTR_WIDTH_13BIT), MP_ROM_INT(13) },
#else
#define MICROPY_PY_MACHINE_ADC_CLASS_CONSTANTS_WIDTH_13
#endif
#define MICROPY_PY_MACHINE_ADC_CLASS_CONSTANTS \
{ MP_ROM_QSTR(MP_QSTR_ATTN_0DB), MP_ROM_INT(ADC_ATTEN_DB_0) }, \
{ MP_ROM_QSTR(MP_QSTR_ATTN_2_5DB), MP_ROM_INT(ADC_ATTEN_DB_2_5) }, \
{ MP_ROM_QSTR(MP_QSTR_ATTN_6DB), MP_ROM_INT(ADC_ATTEN_DB_6) }, \
{ MP_ROM_QSTR(MP_QSTR_ATTN_11DB), MP_ROM_INT(ADC_ATTEN_DB_11) }, \
MICROPY_PY_MACHINE_ADC_CLASS_CONSTANTS_WIDTH_9_10_11 \
MICROPY_PY_MACHINE_ADC_CLASS_CONSTANTS_WIDTH_12 \
MICROPY_PY_MACHINE_ADC_CLASS_CONSTANTS_WIDTH_13 \
static const machine_adc_obj_t madc_obj[] = {
#if CONFIG_IDF_TARGET_ESP32
{{&machine_adc_type}, ADCBLOCK1, ADC_CHANNEL_0, GPIO_NUM_36},
{{&machine_adc_type}, ADCBLOCK1, ADC_CHANNEL_1, GPIO_NUM_37},
{{&machine_adc_type}, ADCBLOCK1, ADC_CHANNEL_2, GPIO_NUM_38},
{{&machine_adc_type}, ADCBLOCK1, ADC_CHANNEL_3, GPIO_NUM_39},
{{&machine_adc_type}, ADCBLOCK1, ADC_CHANNEL_4, GPIO_NUM_32},
{{&machine_adc_type}, ADCBLOCK1, ADC_CHANNEL_5, GPIO_NUM_33},
{{&machine_adc_type}, ADCBLOCK1, ADC_CHANNEL_6, GPIO_NUM_34},
{{&machine_adc_type}, ADCBLOCK1, ADC_CHANNEL_7, GPIO_NUM_35},
{{&machine_adc_type}, ADCBLOCK2, ADC_CHANNEL_0, GPIO_NUM_4},
{{&machine_adc_type}, ADCBLOCK2, ADC_CHANNEL_1, GPIO_NUM_0},
{{&machine_adc_type}, ADCBLOCK2, ADC_CHANNEL_2, GPIO_NUM_2},
{{&machine_adc_type}, ADCBLOCK2, ADC_CHANNEL_3, GPIO_NUM_15},
{{&machine_adc_type}, ADCBLOCK2, ADC_CHANNEL_4, GPIO_NUM_13},
{{&machine_adc_type}, ADCBLOCK2, ADC_CHANNEL_5, GPIO_NUM_12},
{{&machine_adc_type}, ADCBLOCK2, ADC_CHANNEL_6, GPIO_NUM_14},
{{&machine_adc_type}, ADCBLOCK2, ADC_CHANNEL_7, GPIO_NUM_27},
{{&machine_adc_type}, ADCBLOCK2, ADC_CHANNEL_8, GPIO_NUM_25},
{{&machine_adc_type}, ADCBLOCK2, ADC_CHANNEL_9, GPIO_NUM_26},
#elif CONFIG_IDF_TARGET_ESP32C3
{{&machine_adc_type}, ADCBLOCK1, ADC_CHANNEL_0, GPIO_NUM_0},
{{&machine_adc_type}, ADCBLOCK1, ADC_CHANNEL_1, GPIO_NUM_1},
{{&machine_adc_type}, ADCBLOCK1, ADC_CHANNEL_2, GPIO_NUM_2},
{{&machine_adc_type}, ADCBLOCK1, ADC_CHANNEL_3, GPIO_NUM_3},
{{&machine_adc_type}, ADCBLOCK1, ADC_CHANNEL_4, GPIO_NUM_4},
{{&machine_adc_type}, ADCBLOCK2, ADC_CHANNEL_0, GPIO_NUM_5},
#elif CONFIG_IDF_TARGET_ESP32S2 || CONFIG_IDF_TARGET_ESP32S3
{{&machine_adc_type}, ADCBLOCK1, ADC_CHANNEL_0, GPIO_NUM_1},
{{&machine_adc_type}, ADCBLOCK1, ADC_CHANNEL_1, GPIO_NUM_2},
{{&machine_adc_type}, ADCBLOCK1, ADC_CHANNEL_2, GPIO_NUM_3},
{{&machine_adc_type}, ADCBLOCK1, ADC_CHANNEL_3, GPIO_NUM_4},
{{&machine_adc_type}, ADCBLOCK1, ADC_CHANNEL_4, GPIO_NUM_5},
{{&machine_adc_type}, ADCBLOCK1, ADC_CHANNEL_5, GPIO_NUM_6},
{{&machine_adc_type}, ADCBLOCK1, ADC_CHANNEL_6, GPIO_NUM_7},
{{&machine_adc_type}, ADCBLOCK1, ADC_CHANNEL_7, GPIO_NUM_8},
{{&machine_adc_type}, ADCBLOCK1, ADC_CHANNEL_8, GPIO_NUM_9},
{{&machine_adc_type}, ADCBLOCK1, ADC_CHANNEL_9, GPIO_NUM_10},
{{&machine_adc_type}, ADCBLOCK2, ADC_CHANNEL_0, GPIO_NUM_11},
{{&machine_adc_type}, ADCBLOCK2, ADC_CHANNEL_1, GPIO_NUM_12},
{{&machine_adc_type}, ADCBLOCK2, ADC_CHANNEL_2, GPIO_NUM_13},
{{&machine_adc_type}, ADCBLOCK2, ADC_CHANNEL_3, GPIO_NUM_14},
{{&machine_adc_type}, ADCBLOCK2, ADC_CHANNEL_4, GPIO_NUM_15},
{{&machine_adc_type}, ADCBLOCK2, ADC_CHANNEL_5, GPIO_NUM_16},
{{&machine_adc_type}, ADCBLOCK2, ADC_CHANNEL_6, GPIO_NUM_17},
{{&machine_adc_type}, ADCBLOCK2, ADC_CHANNEL_7, GPIO_NUM_18},
{{&machine_adc_type}, ADCBLOCK2, ADC_CHANNEL_8, GPIO_NUM_19},
{{&machine_adc_type}, ADCBLOCK2, ADC_CHANNEL_9, GPIO_NUM_20},
#endif
};
// These values are initialised to 0, which means the corresponding ADC channel is not initialised.
// The madc_atten_get/madc_atten_set functions store (atten+1) here so that the uninitialised state
// can be distinguished from the initialised state.
static uint8_t madc_obj_atten[MP_ARRAY_SIZE(madc_obj)];
static inline adc_atten_t madc_atten_get(const machine_adc_obj_t *self) {
uint8_t value = madc_obj_atten[self - &madc_obj[0]];
return value == 0 ? ADC_ATTEN_MAX : value - 1;
}
static inline void madc_atten_set(const machine_adc_obj_t *self, adc_atten_t atten) {
madc_obj_atten[self - &madc_obj[0]] = atten + 1;
}
const machine_adc_obj_t *madc_search_helper(machine_adc_block_obj_t *block, adc_channel_t channel_id, gpio_num_t gpio_id) {
for (int i = 0; i < MP_ARRAY_SIZE(madc_obj); i++) {
const machine_adc_obj_t *adc = &madc_obj[i];
if ((block == NULL || block == adc->block) && (channel_id == -1 || channel_id == adc->channel_id) && (gpio_id == -1 || gpio_id == adc->gpio_id)) {
return adc;
}
}
return NULL;
}
static void mp_machine_adc_print(const mp_print_t *print, mp_obj_t self_in, mp_print_kind_t kind) {
const machine_adc_obj_t *self = MP_OBJ_TO_PTR(self_in);
mp_printf(print, "ADC(Pin(%u), atten=%u)", self->gpio_id, madc_atten_get(self));
}
static void madc_atten_helper(const machine_adc_obj_t *self, mp_int_t atten) {
esp_err_t err;
if (self->block->unit_id == ADC_UNIT_1) {
err = adc1_config_channel_atten(self->channel_id, atten);
} else {
err = adc2_config_channel_atten(self->channel_id, atten);
}
if (err != ESP_OK) {
mp_raise_ValueError(MP_ERROR_TEXT("invalid atten"));
}
madc_atten_set(self, atten);
}
void madc_init_helper(const machine_adc_obj_t *self, size_t n_pos_args, const mp_obj_t *pos_args, mp_map_t *kw_args) {
enum {
ARG_atten,
};
static const mp_arg_t allowed_args[] = {
{ MP_QSTR_atten, MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = -1} },
};
mp_arg_val_t args[MP_ARRAY_SIZE(allowed_args)];
mp_arg_parse_all(n_pos_args, pos_args, kw_args, MP_ARRAY_SIZE(allowed_args), allowed_args, args);
mp_int_t atten = args[ARG_atten].u_int;
if (atten != -1) {
madc_atten_helper(self, atten);
} else if (madc_atten_get(self) == ADC_ATTEN_MAX) {
madc_atten_helper(self, ADC_ATTEN_DB_0);
}
}
static void mp_machine_adc_init_helper(machine_adc_obj_t *self, size_t n_pos_args, const mp_obj_t *pos_args, mp_map_t *kw_args) {
madc_init_helper(self, n_pos_args, pos_args, kw_args);
}
static mp_obj_t mp_machine_adc_make_new(const mp_obj_type_t *type, size_t n_pos_args, size_t n_kw_args, const mp_obj_t *args) {
mp_arg_check_num(n_pos_args, n_kw_args, 1, MP_OBJ_FUN_ARGS_MAX, true);
gpio_num_t gpio_id = machine_pin_get_id(args[0]);
const machine_adc_obj_t *self = madc_search_helper(NULL, -1, gpio_id);
if (!self) {
mp_raise_ValueError(MP_ERROR_TEXT("invalid pin"));
}
if (self->block->width == -1) {
madcblock_bits_helper(self->block, self->block->bits);
}
mp_map_t kw_args;
mp_map_init_fixed_table(&kw_args, n_kw_args, args + n_pos_args);
madc_init_helper(self, n_pos_args - 1, args + 1, &kw_args);
return MP_OBJ_FROM_PTR(self);
}
static mp_obj_t mp_machine_adc_block(machine_adc_obj_t *self) {
return MP_OBJ_FROM_PTR(self->block);
}
static mp_int_t mp_machine_adc_read(machine_adc_obj_t *self) {
mp_int_t raw = madcblock_read_helper(self->block, self->channel_id);
return raw;
}
static mp_int_t mp_machine_adc_read_u16(machine_adc_obj_t *self) {
mp_uint_t raw = madcblock_read_helper(self->block, self->channel_id);
// Scale raw reading to 16 bit value using a Taylor expansion (for 8 <= bits <= 16)
mp_int_t bits = self->block->bits;
mp_uint_t u16 = raw << (16 - bits) | raw >> (2 * bits - 16);
return u16;
}
static mp_int_t mp_machine_adc_read_uv(machine_adc_obj_t *self) {
adc_atten_t atten = madc_atten_get(self);
return madcblock_read_uv_helper(self->block, self->channel_id, atten);
}
static void mp_machine_adc_atten_set(machine_adc_obj_t *self, mp_int_t atten) {
madc_atten_helper(self, atten);
}
static void mp_machine_adc_width_set(machine_adc_obj_t *self, mp_int_t width) {
madcblock_bits_helper(self->block, width);
}