adc.c 11.5 KB
Newer Older
Dave Hylands's avatar
Dave Hylands committed
1
2
3
4
5
6
7
8
9
#include <stdio.h>
#include <stm32f4xx_hal.h>
#include <string.h>

#include "misc.h"
#include "nlr.h"
#include "mpconfig.h"
#include "qstr.h"
#include "obj.h"
10
#include "runtime.h"
Dave Hylands's avatar
Dave Hylands committed
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
#include "adc.h"
#include "pin.h"
#include "build/pins.h"

// Usage Model:
//
// adc = pyb.ADC(pin)
// val = adc.read()
//
// adc = pyb.ADC_all(resolution)
// val = adc.read_channel(channel)
// val = adc.read_core_temp()
// val = adc.read_core_vbat()
// val = adc.read_core_vref()

/* ADC defintions */
#define ADCx                    (ADC1)
#define ADCx_CLK_ENABLE         __ADC1_CLK_ENABLE
#define ADC_NUM_CHANNELS        (19)
#define ADC_NUM_GPIO_CHANNELS   (16)

#if defined(STM32F405xx) || defined(STM32F415xx) || \
    defined(STM32F407xx) || defined(STM32F417xx) || \
    defined(STM32F401xC) || defined(STM32F401xE)
#define VBAT_DIV (2)
#elif defined(STM32F427xx) || defined(STM32F429xx) || \
      defined(STM32F437xx) || defined(STM32F439xx)
#define VBAT_DIV (4)
#endif

/* Core temperature sensor definitions */
#define CORE_TEMP_V25          (943)  /* (0.76v/3.3v)*(2^ADC resoultion) */
#define CORE_TEMP_AVG_SLOPE    (3)    /* (2.5mv/3.3v)*(2^ADC resoultion) */

typedef struct _pyb_obj_adc_t {
    mp_obj_base_t base;
    mp_obj_t pin_name;
    int channel;
    ADC_HandleTypeDef handle;
} pyb_obj_adc_t;

void adc_init_single(pyb_obj_adc_t *adc_obj) {
    if (!IS_ADC_CHANNEL(adc_obj->channel)) {
        return;
    }

    if (adc_obj->channel < ADC_NUM_GPIO_CHANNELS) {
      // Channels 0-16 correspond to real pins. Configure the GPIO pin in
      // ADC mode.
      const pin_obj_t *pin = pin_adc1[adc_obj->channel];
      GPIO_InitTypeDef GPIO_InitStructure;
      GPIO_InitStructure.Pin = pin->pin_mask;
      GPIO_InitStructure.Mode = GPIO_MODE_ANALOG;
      GPIO_InitStructure.Pull = GPIO_NOPULL;
      HAL_GPIO_Init(pin->gpio, &GPIO_InitStructure);
    }

    ADCx_CLK_ENABLE();

    ADC_HandleTypeDef *adcHandle = &adc_obj->handle;
    adcHandle->Instance                   = ADCx;
    adcHandle->Init.ClockPrescaler        = ADC_CLOCKPRESCALER_PCLK_DIV2;
    adcHandle->Init.Resolution            = ADC_RESOLUTION12b;
    adcHandle->Init.ScanConvMode          = DISABLE;
    adcHandle->Init.ContinuousConvMode    = DISABLE;
    adcHandle->Init.DiscontinuousConvMode = DISABLE;
    adcHandle->Init.NbrOfDiscConversion   = 0;
    adcHandle->Init.ExternalTrigConvEdge  = ADC_EXTERNALTRIGCONVEDGE_NONE;
    adcHandle->Init.ExternalTrigConv      = ADC_EXTERNALTRIGCONV_T1_CC1;
    adcHandle->Init.DataAlign             = ADC_DATAALIGN_RIGHT;
    adcHandle->Init.NbrOfConversion       = 1;
    adcHandle->Init.DMAContinuousRequests = DISABLE;
    adcHandle->Init.EOCSelection          = DISABLE;

    HAL_ADC_Init(adcHandle);

    ADC_ChannelConfTypeDef sConfig;

    sConfig.Channel = adc_obj->channel;
    sConfig.Rank = 1;
    sConfig.SamplingTime = ADC_SAMPLETIME_15CYCLES;
    sConfig.Offset = 0;

    HAL_ADC_ConfigChannel(adcHandle, &sConfig);
}

97
uint32_t adc_read_channel(ADC_HandleTypeDef *adcHandle) {
Dave Hylands's avatar
Dave Hylands committed
98
99
100
    uint32_t rawValue = 0;

    HAL_ADC_Start(adcHandle);
101
    if (HAL_ADC_PollForConversion(adcHandle, 10) == HAL_OK && HAL_ADC_GetState(adcHandle) == HAL_ADC_STATE_EOC_REG) {
Dave Hylands's avatar
Dave Hylands committed
102
103
104
105
106
107
108
109
110
111
        rawValue = HAL_ADC_GetValue(adcHandle);
    }
    HAL_ADC_Stop(adcHandle);

    return rawValue;
}

/******************************************************************************/
/* Micro Python bindings : adc object (single channel)                        */

112
STATIC void adc_print(void (*print)(void *env, const char *fmt, ...), void *env, mp_obj_t self_in, mp_print_kind_t kind) {
Dave Hylands's avatar
Dave Hylands committed
113
114
115
116
117
118
    pyb_obj_adc_t *self = self_in;
    print(env, "<ADC on ");
    mp_obj_print_helper(print, env, self->pin_name, PRINT_STR);
    print(env, " channel=%lu>", self->channel);
}

119
120
STATIC mp_obj_t adc_make_new(mp_obj_t type_in, uint n_args, uint n_kw, const mp_obj_t *args) {
    // check number of arguments
Damien George's avatar
Damien George committed
121
    mp_check_nargs(n_args, 1, 1, n_kw, false);
Dave Hylands's avatar
Dave Hylands committed
122

123
124
    // 1st argument is the pin name
    mp_obj_t pin_obj = args[0];
Dave Hylands's avatar
Dave Hylands committed
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147

    uint32_t channel;

    if (MP_OBJ_IS_INT(pin_obj)) {
        channel = mp_obj_get_int(pin_obj);
    } else {
        const pin_obj_t *pin = pin_map_user_obj(pin_obj);
        if ((pin->adc_num & PIN_ADC1) == 0) {
            // No ADC1 function on that pin
            nlr_jump(mp_obj_new_exception_msg_varg(&mp_type_ValueError, "pin %s does not have ADC capabilities", pin->name));
        }
        channel = pin->adc_channel;
    }

    if (!IS_ADC_CHANNEL(channel)) {
        nlr_jump(mp_obj_new_exception_msg_varg(&mp_type_ValueError, "Not a valid ADC Channel: %d", channel));
    }
    if (pin_adc1[channel] == NULL) {
        nlr_jump(mp_obj_new_exception_msg_varg(&mp_type_ValueError, "Channel %d not available on this board", channel));
    }

    pyb_obj_adc_t *o = m_new_obj(pyb_obj_adc_t);
    memset(o, 0, sizeof(*o));
148
    o->base.type = &pyb_adc_type;
Dave Hylands's avatar
Dave Hylands committed
149
150
151
152
153
154
155
    o->pin_name = pin_obj;
    o->channel = channel;
    adc_init_single(o);

    return o;
}

156
157
158
159
160
161
162
163
164
STATIC mp_obj_t adc_read(mp_obj_t self_in) {
    pyb_obj_adc_t *self = self_in;

    uint32_t data = adc_read_channel(&self->handle);
    return mp_obj_new_int(data);
}

STATIC MP_DEFINE_CONST_FUN_OBJ_1(adc_read_obj, adc_read);

165
166
STATIC const mp_map_elem_t adc_locals_dict_table[] = {
    { MP_OBJ_NEW_QSTR(MP_QSTR_read), (mp_obj_t)&adc_read_obj},
167
168
};

169
170
STATIC MP_DEFINE_CONST_DICT(adc_locals_dict, adc_locals_dict_table);

171
172
173
174
175
const mp_obj_type_t pyb_adc_type = {
    { &mp_type_type },
    .name = MP_QSTR_ADC,
    .print = adc_print,
    .make_new = adc_make_new,
176
    .locals_dict = (mp_obj_t)&adc_locals_dict,
177
};
Dave Hylands's avatar
Dave Hylands committed
178
179
180
181
182
183
184
185
186
187
188
189

/******************************************************************************/
/* adc all object                                                             */

typedef struct _pyb_obj_adc_all_t {
    mp_obj_base_t base;
    ADC_HandleTypeDef handle;
} pyb_obj_adc_all_t;

void adc_init_all(pyb_obj_adc_all_t *adc_all, uint32_t resolution) {

    switch (resolution) {
Dave Hylands's avatar
Dave Hylands committed
190
191
192
193
        case 6:  resolution = ADC_RESOLUTION6b;  break;
        case 8:  resolution = ADC_RESOLUTION8b;  break;
        case 10: resolution = ADC_RESOLUTION10b; break;
        case 12: resolution = ADC_RESOLUTION12b; break;
Dave Hylands's avatar
Dave Hylands committed
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
        default:
            nlr_jump(mp_obj_new_exception_msg_varg(&mp_type_ValueError,
                "resolution %d not supported", resolution));
    }

    for (uint32_t channel = 0; channel < ADC_NUM_GPIO_CHANNELS; channel++) {
        // Channels 0-16 correspond to real pins. Configure the GPIO pin in
        // ADC mode.
        const pin_obj_t *pin = pin_adc1[channel];
        GPIO_InitTypeDef GPIO_InitStructure;
        GPIO_InitStructure.Pin = pin->pin_mask;
        GPIO_InitStructure.Mode = GPIO_MODE_ANALOG;
        GPIO_InitStructure.Pull = GPIO_NOPULL;
        HAL_GPIO_Init(pin->gpio, &GPIO_InitStructure);
    }

    ADCx_CLK_ENABLE();

    ADC_HandleTypeDef *adcHandle = &adc_all->handle;
    adcHandle->Instance = ADCx;
    adcHandle->Init.ClockPrescaler        = ADC_CLOCKPRESCALER_PCLK_DIV2;
    adcHandle->Init.Resolution            = resolution;
    adcHandle->Init.ScanConvMode          = DISABLE;
    adcHandle->Init.ContinuousConvMode    = DISABLE;
    adcHandle->Init.DiscontinuousConvMode = DISABLE;
    adcHandle->Init.NbrOfDiscConversion   = 0;
    adcHandle->Init.ExternalTrigConvEdge  = ADC_EXTERNALTRIGCONVEDGE_NONE;
    adcHandle->Init.ExternalTrigConv      = ADC_EXTERNALTRIGCONV_T1_CC1;
    adcHandle->Init.DataAlign             = ADC_DATAALIGN_RIGHT;
    adcHandle->Init.NbrOfConversion       = 1;
    adcHandle->Init.DMAContinuousRequests = DISABLE;
    adcHandle->Init.EOCSelection          = DISABLE;

    HAL_ADC_Init(adcHandle);
}

230
uint32_t adc_config_and_read_channel(ADC_HandleTypeDef *adcHandle, uint32_t channel) {
Dave Hylands's avatar
Dave Hylands committed
231
232
233
234
235
236
237
238
239
240
    ADC_ChannelConfTypeDef sConfig;
    sConfig.Channel = channel;
    sConfig.Rank = 1;
    sConfig.SamplingTime = ADC_SAMPLETIME_15CYCLES;
    sConfig.Offset = 0;
    HAL_ADC_ConfigChannel(adcHandle, &sConfig);

    return adc_read_channel(adcHandle);
}

Dave Hylands's avatar
Dave Hylands committed
241
242
243
244
245
246
247
248
249
250
251
int adc_get_resolution(ADC_HandleTypeDef *adcHandle) {
    uint32_t res_reg = __HAL_ADC_GET_RESOLUTION(adcHandle);

    switch (res_reg) {
        case ADC_RESOLUTION6b:  return 6;
        case ADC_RESOLUTION8b:  return 8;
        case ADC_RESOLUTION10b: return 10;
    }
    return 12;
}

252
int adc_read_core_temp(ADC_HandleTypeDef *adcHandle) {
Dave Hylands's avatar
Dave Hylands committed
253
    int32_t raw_value = adc_config_and_read_channel(adcHandle, ADC_CHANNEL_TEMPSENSOR);
Dave Hylands's avatar
Dave Hylands committed
254
255
256
257
258

    // Note: constants assume 12-bit resolution, so we scale the raw value to
    //       be 12-bits.
    raw_value <<= (12 - adc_get_resolution(adcHandle));

Dave Hylands's avatar
Dave Hylands committed
259
260
261
    return ((raw_value - CORE_TEMP_V25) / CORE_TEMP_AVG_SLOPE) + 25;
}

262
float adc_read_core_vbat(ADC_HandleTypeDef *adcHandle) {
Dave Hylands's avatar
Dave Hylands committed
263
    uint32_t raw_value = adc_config_and_read_channel(adcHandle, ADC_CHANNEL_VBAT);
Dave Hylands's avatar
Dave Hylands committed
264
265
266
267
268

    // Note: constants assume 12-bit resolution, so we scale the raw value to
    //       be 12-bits.
    raw_value <<= (12 - adc_get_resolution(adcHandle));

Dave Hylands's avatar
Dave Hylands committed
269
270
271
    return raw_value * VBAT_DIV / 4096.0f * 3.3f;
}

272
float adc_read_core_vref(ADC_HandleTypeDef *adcHandle) {
Dave Hylands's avatar
Dave Hylands committed
273
    uint32_t raw_value = adc_config_and_read_channel(adcHandle, ADC_CHANNEL_VREFINT);
Dave Hylands's avatar
Dave Hylands committed
274
275
276
277
278

    // Note: constants assume 12-bit resolution, so we scale the raw value to
    //       be 12-bits.
    raw_value <<= (12 - adc_get_resolution(adcHandle));

Dave Hylands's avatar
Dave Hylands committed
279
280
281
282
283
284
    return raw_value * VBAT_DIV / 4096.0f * 3.3f;
}

/******************************************************************************/
/* Micro Python bindings : adc_all object                                     */

285
STATIC void adc_all_print(void (*print)(void *env, const char *fmt, ...), void *env, mp_obj_t self_in, mp_print_kind_t kind) {
Dave Hylands's avatar
Dave Hylands committed
286
287
288
    print(env, "<ADC all>");
}

289
STATIC mp_obj_t adc_all_read_channel(mp_obj_t self_in, mp_obj_t channel) {
Dave Hylands's avatar
Dave Hylands committed
290
291
292
293
294
295
296
    pyb_obj_adc_all_t *self = self_in;

    uint32_t chan = mp_obj_get_int(channel);
    uint32_t data = adc_config_and_read_channel(&self->handle, chan);
    return mp_obj_new_int(data);
}

297
STATIC mp_obj_t adc_all_read_core_temp(mp_obj_t self_in) {
Dave Hylands's avatar
Dave Hylands committed
298
299
300
301
302
303
    pyb_obj_adc_all_t *self = self_in;

    int data  = adc_read_core_temp(&self->handle);
    return mp_obj_new_int(data);
}

304
STATIC mp_obj_t adc_all_read_core_vbat(mp_obj_t self_in) {
Dave Hylands's avatar
Dave Hylands committed
305
306
307
308
309
310
    pyb_obj_adc_all_t *self = self_in;

    float data = adc_read_core_vbat(&self->handle);
    return mp_obj_new_float(data);
}

311
STATIC mp_obj_t adc_all_read_core_vref(mp_obj_t self_in) {
Dave Hylands's avatar
Dave Hylands committed
312
313
314
315
316
317
    pyb_obj_adc_all_t *self = self_in;

    float data  = adc_read_core_vref(&self->handle);
    return mp_obj_new_float(data);
}

318
319
320
321
STATIC MP_DEFINE_CONST_FUN_OBJ_2(adc_all_read_channel_obj, adc_all_read_channel);
STATIC MP_DEFINE_CONST_FUN_OBJ_1(adc_all_read_core_temp_obj, adc_all_read_core_temp);
STATIC MP_DEFINE_CONST_FUN_OBJ_1(adc_all_read_core_vbat_obj, adc_all_read_core_vbat);
STATIC MP_DEFINE_CONST_FUN_OBJ_1(adc_all_read_core_vref_obj, adc_all_read_core_vref);
Dave Hylands's avatar
Dave Hylands committed
322

323
324
325
326
327
STATIC const mp_map_elem_t adc_all_locals_dict_table[] = {
    { MP_OBJ_NEW_QSTR(MP_QSTR_read_channel), (mp_obj_t)  &adc_all_read_channel_obj},
    { MP_OBJ_NEW_QSTR(MP_QSTR_read_core_temp), (mp_obj_t)&adc_all_read_core_temp_obj},
    { MP_OBJ_NEW_QSTR(MP_QSTR_read_core_vbat), (mp_obj_t)&adc_all_read_core_vbat_obj},
    { MP_OBJ_NEW_QSTR(MP_QSTR_read_core_vref), (mp_obj_t)&adc_all_read_core_vref_obj},
Dave Hylands's avatar
Dave Hylands committed
328
329
};

330
331
STATIC MP_DEFINE_CONST_DICT(adc_all_locals_dict, adc_all_locals_dict_table);

332
STATIC const mp_obj_type_t adc_all_type = {
Dave Hylands's avatar
Dave Hylands committed
333
334
335
    { &mp_type_type },
    .name = MP_QSTR_ADC,
    .print = adc_all_print,
336
    .locals_dict = (mp_obj_t)&adc_all_locals_dict,
Dave Hylands's avatar
Dave Hylands committed
337
338
};

339
STATIC mp_obj_t pyb_ADC_all(mp_obj_t resolution) {
Dave Hylands's avatar
Dave Hylands committed
340
341
342
343
344
345
346
    pyb_obj_adc_all_t *o = m_new_obj(pyb_obj_adc_all_t);
    o->base.type = &adc_all_type;
    adc_init_all(o, mp_obj_get_int(resolution));
    return o;
}

MP_DEFINE_CONST_FUN_OBJ_1(pyb_ADC_all_obj, pyb_ADC_all);