forked from whitecatboard/Lua-RTOS-ESP32
/
ds1820.c
782 lines (662 loc) · 21.3 KB
/
ds1820.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
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
/**
* DS1820 Family temperature sensor driver for Lua-RTOS-ESP32
* author: LoBo (loboris@gmail.com)
* based on TM_ONEWIRE (author Tilen Majerle)
*/
#include "luartos.h"
#if CONFIG_LUA_RTOS_LUA_USE_SENSOR
#include <math.h>
#include <string.h>
#include <stdio.h>
#include "sensors/ds1820.h"
#include "time.h"
#include "drivers/owire.h"
#include <sys/driver.h>
static int ds_parasite_pwr = 0;
extern TM_One_Wire_Devices_t ow_devices[MAX_ONEWIRE_PINS];
#ifdef DS18B20ALARMFUNC
static unsigned char ow_alarm_device [MAX_ONEWIRE_SENSORS][8];
#endif
// Sensor specification and registration
const sensor_t __attribute__((used,unused,section(".sensors"))) ds1820_sensor = {
.id = "DS1820",
.interface = OWIRE_INTERFACE,
.data = {
{.id = "temperature", .type = SENSOR_DATA_FLOAT},
},
.properties = {
{.id = "resolution", .type = SENSOR_DATA_INT},
{.id = "rom", .type = SENSOR_DATA_STRING},
{.id = "type", .type = SENSOR_DATA_STRING},
{.id = "numdev", .type = SENSOR_DATA_INT},
},
.setup = ds1820_setup,
.acquire = ds1820_acquire,
.set = ds1820_set,
.get = ds1820_get,
};
//*********************
// TM_DS18B20_Functions
//*********************
//-----------------------------------------------
unsigned char TM_DS18B20_Is(unsigned char *ROM) {
/* Checks if first byte is equal to DS18B20's family code */
if ((*ROM == DS18B20_FAMILY_CODE) ||
(*ROM == DS18S20_FAMILY_CODE) ||
(*ROM == DS1822_FAMILY_CODE) ||
(*ROM == DS28EA00_FAMILY_CODE)) {
return *ROM;
}
return 0;
}
//-----------------------------------------------------------------
static void TM_DS18B20_Family(unsigned char code, char *dsfamily) {
switch (code) {
case DS18B20_FAMILY_CODE:
sprintf(dsfamily, "DS18B20");
break;
case DS18S20_FAMILY_CODE:
sprintf(dsfamily, "DS18S20");
break;
case DS1822_FAMILY_CODE:
sprintf(dsfamily, "DS1822");
break;
case DS28EA00_FAMILY_CODE:
sprintf(dsfamily, "DS28EA00");
break;
default:
sprintf(dsfamily, "unknown");
}
}
//------------------------------------
static int getPowerMode(uint8_t dev) {
// Reset pulse
if (TM_OneWire_Reset(dev) != 0) return owError_NoDevice;
// Skip rom
TM_OneWire_WriteByte(dev, ONEWIRE_CMD_SKIPROM);
// Test parasite power
TM_OneWire_WriteByte(dev, ONEWIRE_CMD_RPWRSUPPLY);
if (TM_OneWire_ReadBit(dev) == 0) ds_parasite_pwr = 1;
else ds_parasite_pwr = 0;
return ow_OK;
}
//------------------------------------------------------------------
static owState_t TM_DS18B20_Start(uint8_t dev, unsigned char *ROM) {
// Check if device is DS18B20
if (!TM_DS18B20_Is(ROM)) {
return owError_Not18b20;
}
if (getPowerMode(dev)) return owError_NoDevice;
// Reset line
if (TM_OneWire_Reset(dev) != 0) return owError_NoDevice;
// Select ROM number
TM_OneWire_SelectWithPointer(dev, ROM);
// Start temperature conversion
TM_OneWire_WriteByte(dev, DS18B20_CMD_CONVERTTEMP);
if (ds_parasite_pwr) owdevice_pinpower(dev);
return ow_OK;
}
//-------------------------------------------------
#if 0
static owState_t TM_DS18B20_StartAll(uint8_t dev) {
if (getPowerMode(dev)) return owError_NoDevice;
// Reset pulse
if (TM_OneWire_Reset(dev) != 0) return owError_NoDevice;;
// Skip rom
TM_OneWire_WriteByte(dev, ONEWIRE_CMD_SKIPROM);
// Start conversion on all connected devices
TM_OneWire_WriteByte(dev, DS18B20_CMD_CONVERTTEMP);
if (ds_parasite_pwr) owdevice_pinpower(dev);
return ow_OK;
}
#endif
//--------------------------------------------------------------------------------------
static owState_t TM_DS18B20_Read(uint8_t dev, unsigned char *ROM, double *destination) {
unsigned int temperature;
unsigned char resolution;
char digit, minus = 0;
double decimal;
unsigned char i = 0;
unsigned char data[9];
unsigned char crc;
/* Check if device is DS18B20 */
if (!TM_DS18B20_Is(ROM)) {
return owError_Not18b20;
}
/* Check if line is released, if it is, then conversion is complete */
if (!TM_OneWire_ReadBit(dev)) {
/* Conversion is not finished yet */
return owError_NotFinished;
}
/* Reset line */
if (TM_OneWire_Reset(dev) != 0) {
return owError_NoDevice;
}
/* Select ROM number */
TM_OneWire_SelectWithPointer(dev, ROM);
/* Read scratchpad command by onewire protocol */
TM_OneWire_WriteByte(dev, ONEWIRE_CMD_RSCRATCHPAD);
/* Get data */
for (i = 0; i < 9; i++) {
/* Read byte by byte */
data[i] = TM_OneWire_ReadByte(dev);
}
/* Calculate CRC */
crc = TM_OneWire_CRC8(data, 8);
/* Check if CRC is ok */
if (crc != data[8]) {
/* CRC invalid */
return owError_BadCRC;
}
/* First two bytes of scratchpad are temperature values */
temperature = data[0] | (data[1] << 8);
/* Reset line */
TM_OneWire_Reset(dev);
if (*ROM != DS18S20_FAMILY_CODE) {
/* Check if temperature is negative */
if (temperature & 0x8000) {
/* Two's complement, temperature is negative */
temperature = ~temperature + 1;
minus = 1;
}
/* Get sensor resolution */
resolution = ((data[4] & 0x60) >> 5) + 9;
/* Store temperature integer digits and decimal digits */
digit = temperature >> 4;
digit |= ((temperature >> 8) & 0x7) << 4;
/* Store decimal digits */
switch (resolution) {
case 9: {
decimal = (temperature >> 3) & 0x01;
decimal *= (double)DS18B20_DECIMAL_STEPS_9BIT;
} break;
case 10: {
decimal = (temperature >> 2) & 0x03;
decimal *= (double)DS18B20_DECIMAL_STEPS_10BIT;
} break;
case 11: {
decimal = (temperature >> 1) & 0x07;
decimal *= (double)DS18B20_DECIMAL_STEPS_11BIT;
} break;
case 12: {
decimal = temperature & 0x0F;
decimal *= (double)DS18B20_DECIMAL_STEPS_12BIT;
} break;
default: {
decimal = 0xFF;
digit = 0;
}
}
/* Check for negative part */
decimal = digit + decimal;
if (minus) {
decimal = 0 - decimal;
}
/* Set to pointer */
*destination = decimal;
}
else {
if (!data[7]) {
return owError_Convert;
}
if (data[1] == 0) {
temperature = ((int)(data[0] >> 1))*1000;
}
else { // negative
temperature = 1000*(-1*(int)(0x100-data[0]) >> 1);
}
temperature -= 250;
decimal = 1000*((int)(data[7] - data[6]));
decimal /= (int)data[7];
temperature += decimal;
/* Set to pointer */
*destination = (double)temperature / 1000.0;
}
/* Return 1, temperature valid */
return ow_OK;
}
//------------------------------------------------------------------------------
static unsigned char TM_DS18B20_GetResolution(uint8_t dev, unsigned char *ROM) {
unsigned char conf;
if (!TM_DS18B20_Is(ROM)) {
return owError_Not18b20;
}
if (*ROM == DS18S20_FAMILY_CODE) return TM_DS18B20_Resolution_12bits;
/* Reset line */
if (TM_OneWire_Reset(dev) != 0) {
return owError_NoDevice;
}
/* Select ROM number */
TM_OneWire_SelectWithPointer(dev, ROM);
/* Read scratchpad command by onewire protocol */
TM_OneWire_WriteByte(dev, ONEWIRE_CMD_RSCRATCHPAD);
/* Ignore first 4 bytes */
TM_OneWire_ReadByte(dev);
TM_OneWire_ReadByte(dev);
TM_OneWire_ReadByte(dev);
TM_OneWire_ReadByte(dev);
/* 5th byte of scratchpad is configuration register */
conf = TM_OneWire_ReadByte(dev);
/* Return 9 - 12 value according to number of bits */
return ((conf & 0x60) >> 5) + 9;
}
//--------------------------------------------------------------------------------------------------------------
static owState_t TM_DS18B20_SetResolution(uint8_t dev, unsigned char *ROM, TM_DS18B20_Resolution_t resolution) {
unsigned char th, tl, conf;
if (!TM_DS18B20_Is(ROM)) return owError_Not18b20;
if (getPowerMode(dev)) return owError_NoDevice;
if (*ROM == DS18S20_FAMILY_CODE) return ow_OK;
/* Reset line */
if (TM_OneWire_Reset(dev) != 0) return owError_NoDevice;
/* Select ROM number */
TM_OneWire_SelectWithPointer(dev, ROM);
/* Read scratchpad command by onewire protocol */
TM_OneWire_WriteByte(dev, ONEWIRE_CMD_RSCRATCHPAD);
/* Ignore first 2 bytes */
TM_OneWire_ReadByte(dev);
TM_OneWire_ReadByte(dev);
th = TM_OneWire_ReadByte(dev);
tl = TM_OneWire_ReadByte(dev);
conf = TM_OneWire_ReadByte(dev);
if (resolution == TM_DS18B20_Resolution_9bits) {
conf &= ~(1 << DS18B20_RESOLUTION_R1);
conf &= ~(1 << DS18B20_RESOLUTION_R0);
} else if (resolution == TM_DS18B20_Resolution_10bits) {
conf &= ~(1 << DS18B20_RESOLUTION_R1);
conf |= 1 << DS18B20_RESOLUTION_R0;
} else if (resolution == TM_DS18B20_Resolution_11bits) {
conf |= 1 << DS18B20_RESOLUTION_R1;
conf &= ~(1 << DS18B20_RESOLUTION_R0);
} else if (resolution == TM_DS18B20_Resolution_12bits) {
conf |= 1 << DS18B20_RESOLUTION_R1;
conf |= 1 << DS18B20_RESOLUTION_R0;
}
/* Reset line */
if (TM_OneWire_Reset(dev) != 0) return owError_NoDevice;
/* Select ROM number */
TM_OneWire_SelectWithPointer(dev, ROM);
/* Write scratchpad command by onewire protocol, only th, tl and conf register can be written */
TM_OneWire_WriteByte(dev, ONEWIRE_CMD_WSCRATCHPAD);
/* Write bytes */
TM_OneWire_WriteByte(dev, th);
TM_OneWire_WriteByte(dev, tl);
TM_OneWire_WriteByte(dev, conf);
/* Reset line */
if (TM_OneWire_Reset(dev) != 0) return owError_NoDevice;
/* Select ROM number */
TM_OneWire_SelectWithPointer(dev, ROM);
/* Copy scratchpad to EEPROM of DS18B20 */
TM_OneWire_WriteByte(dev, ONEWIRE_CMD_CPYSCRATCHPAD);
if (ds_parasite_pwr) owdevice_pinpower(dev);
vTaskDelay(20 / portTICK_RATE_MS);
if (ds_parasite_pwr) owdevice_input(dev);
return ow_OK;
}
/***************************/
/* DS18B20 Alarm functions */
/***************************/
#ifdef DS18B20ALARMFUNC
//-------------------------------------------------------------------------------------------------
static unsigned char TM_DS18B20_SetAlarmLowTemperature(uint8_t dev, unsigned char *ROM, int temp) {
unsigned char tl, th, conf;
if (!TM_DS18B20_Is(ROM)) {
return owError_Not18b20;
}
if (temp > 125) {
temp = 125;
}
if (temp < -55) {
temp = -55;
}
/* Reset line */
if (TM_OneWire_Reset(dev) != 0) {
return owError_NoDevice;
}
/* Select ROM number */
TM_OneWire_SelectWithPointer(dev, ROM);
/* Read scratchpad command by onewire protocol */
TM_OneWire_WriteByte(dev, ONEWIRE_CMD_RSCRATCHPAD);
/* Ignore first 2 bytes */
TM_OneWire_ReadByte(dev);
TM_OneWire_ReadByte(dev);
th = TM_OneWire_ReadByte(dev);
tl = TM_OneWire_ReadByte(dev);
conf = TM_OneWire_ReadByte(dev);
tl = (unsigned char)temp;
/* Reset line */
if (TM_OneWire_Reset(dev) != 0) {
return owError_NoDevice;
}
/* Select ROM number */
TM_OneWire_SelectWithPointer(dev, ROM);
/* Write scratchpad command by onewire protocol, only th, tl and conf register can be written */
TM_OneWire_WriteByte(dev, ONEWIRE_CMD_WSCRATCHPAD);
/* Write bytes */
TM_OneWire_WriteByte(dev, th);
TM_OneWire_WriteByte(dev, tl);
TM_OneWire_WriteByte(dev, conf);
/* Reset line */
if (TM_OneWire_Reset(dev) != 0) {
return owError_NoDevice;
}
/* Select ROM number */
TM_OneWire_SelectWithPointer(dev, ROM);
/* Copy scratchpad to EEPROM of DS18B20 */
TM_OneWire_WriteByte(dev, ONEWIRE_CMD_CPYSCRATCHPAD);
return ow_OK;
}
//----------------------------------------------------------------------------------------------
static owState_t TM_DS18B20_SetAlarmHighTemperature(uint8_t dev, unsigned char *ROM, int temp) {
unsigned char tl, th, conf;
if (!TM_DS18B20_Is(ROM)) {
return owError_Not18b20;
}
if (temp > 125) {
temp = 125;
}
if (temp < -55) {
temp = -55;
}
/* Reset line */
if (TM_OneWire_Reset(dev) != 0) {
return owError_NoDevice;
}
/* Select ROM number */
TM_OneWire_SelectWithPointer(dev, ROM);
/* Read scratchpad command by onewire protocol */
TM_OneWire_WriteByte(dev, ONEWIRE_CMD_RSCRATCHPAD);
/* Ignore first 2 bytes */
TM_OneWire_ReadByte(dev);
TM_OneWire_ReadByte(dev);
th = TM_OneWire_ReadByte(dev);
tl = TM_OneWire_ReadByte(dev);
conf = TM_OneWire_ReadByte(dev);
th = (unsigned char)temp;
/* Reset line */
if (TM_OneWire_Reset(dev) != 0) {
return owError_NoDevice;
}
/* Select ROM number */
TM_OneWire_SelectWithPointer(dev, ROM);
/* Write scratchpad command by onewire protocol, only th, tl and conf register can be written */
TM_OneWire_WriteByte(dev, ONEWIRE_CMD_WSCRATCHPAD);
/* Write bytes */
TM_OneWire_WriteByte(dev, th);
TM_OneWire_WriteByte(dev, tl);
TM_OneWire_WriteByte(dev, conf);
/* Reset line */
if (TM_OneWire_Reset(dev) != 0) {
return owError_NoDevice;
}
/* Select ROM number */
TM_OneWire_SelectWithPointer(dev, ROM);
/* Copy scratchpad to EEPROM of DS18B20 */
TM_OneWire_WriteByte(dev, ONEWIRE_CMD_CPYSCRATCHPAD);
return ow_OK;
}
//------------------------------------------------------------------------------------
static owState_t TM_DS18B20_DisableAlarmTemperature(uint8_t dev, unsigned char *ROM) {
unsigned char tl, th, conf;
if (!TM_DS18B20_Is(ROM)) {
return owError_Not18b20;
}
/* Reset line */
if (TM_OneWire_Reset(dev) != 0) {
return owError_NoDevice;
}
/* Select ROM number */
TM_OneWire_SelectWithPointer(dev, ROM);
/* Read scratchpad command by onewire protocol */
TM_OneWire_WriteByte(dev, ONEWIRE_CMD_RSCRATCHPAD);
/* Ignore first 2 bytes */
TM_OneWire_ReadByte(dev);
TM_OneWire_ReadByte(dev);
th = TM_OneWire_ReadByte(dev);
tl = TM_OneWire_ReadByte(dev);
conf = TM_OneWire_ReadByte(dev);
th = 125;
tl = (unsigned char)-55;
/* Reset line */
if (TM_OneWire_Reset(dev) != 0) {
return owError_NoDevice;
}
/* Select ROM number */
TM_OneWire_SelectWithPointer(dev, ROM);
/* Write scratchpad command by onewire protocol, only th, tl and conf register can be written */
TM_OneWire_WriteByte(dev, ONEWIRE_CMD_WSCRATCHPAD);
/* Write bytes */
TM_OneWire_WriteByte(dev, th);
TM_OneWire_WriteByte(dev, tl);
TM_OneWire_WriteByte(dev, conf);
/* Reset line */
if (TM_OneWire_Reset(dev) != 0) {
return owError_NoDevice;
}
/* Select ROM number */
TM_OneWire_SelectWithPointer(dev, ROM);
/* Copy scratchpad to EEPROM of DS18B20 */
TM_OneWire_WriteByte(dev, ONEWIRE_CMD_CPYSCRATCHPAD);
return ow_OK;
}
//--------------------------------------------------------
static unsigned char TM_DS18B20_AlarmSearch(uint8_t dev) {
/* Start alarm search */
return TM_OneWire_Search(dev, DS18B20_CMD_ALARMSEARCH);
}
#endif /* DS18B20ALARMFUNC */
//----------------------------------------
static uint8_t numDS1820dev(uint8_t dev) {
// get number of DS1820 devices on the bus
uint8_t count = 0;
for (uint8_t i=0;i<MAX_ONEWIRE_SENSORS;i++) {
if (TM_DS18B20_Is(&(ow_devices[dev].roms[i][0]))) count++;
}
return count;
}
/*
* DS1820 sensor functions
*/
//------------------------------------------------------
void ds1820_getrom(sensor_instance_t *unit, char *ROM) {
uint8_t owdev = unit->setup.owire.owdevice;
uint8_t sens = unit->setup.owire.owsensor - 1;
sens = owire_addess_to_dev(owdev, sens);
int i;
for (i = 0; i < 8; i++) {
sprintf(ROM+(i*2), "%02x", ow_devices[owdev].roms[sens][i]);
}
}
//-------------------------------------------------------
void ds1820_gettype(sensor_instance_t *unit, char *buf) {
uint8_t owdev = unit->setup.owire.owdevice;
uint8_t sens = unit->setup.owire.owsensor - 1;
sens = owire_addess_to_dev(owdev, sens);
uint8_t code = TM_DS18B20_Is(&(ow_devices[owdev].roms[sens][0]));
if (code) TM_DS18B20_Family(code, buf);
else sprintf(buf, "unknown");
}
//-----------------------------------------------
uint8_t ds1820_get_res(sensor_instance_t *unit) {
return unit->properties[0].integerd.value;
}
//-------------------------------------
void ow_list(sensor_instance_t *unit) {
char rombuf[17];
char family[12];
uint8_t owdev = unit->setup.owire.owdevice;
for (int i=0;i<ow_devices[owdev].numdev;i++) {
for (int j = 0; j < 8; j++) {
sprintf(rombuf+(j*2), "%02x", ow_devices[owdev].roms[i][j]);
}
printf("%02d [%s]", i+1, rombuf);
uint8_t code = TM_DS18B20_Is(&(ow_devices[owdev].roms[i][0]));
if (code) {
TM_DS18B20_Family(code, family);
printf(" %s\r\n", family);
}
else printf(" unknown\r\n");
}
}
//----------------------------------------------
uint8_t ds1820_numdev(sensor_instance_t *unit) {
uint8_t dev = unit->setup.owire.owdevice;
return numDS1820dev(dev);
}
//---------------------------------------------------------------------------
static uint8_t _set_resolution(uint8_t ds_res, uint8_t dev, uint8_t ds_dev) {
uint8_t res = ds_res;
if ( res!=TM_DS18B20_Resolution_9bits &&
res!=TM_DS18B20_Resolution_10bits &&
res!=TM_DS18B20_Resolution_11bits &&
res!=TM_DS18B20_Resolution_12bits ) {
res = TM_DS18B20_Resolution_10bits;
}
if (ow_devices[dev].roms[ds_dev-1][0] == DS18S20_FAMILY_CODE) {
res = TM_DS18B20_Resolution_9bits;
}
else {
res = TM_DS18B20_SetResolution(dev, ow_devices[dev].roms[ds_dev-1], (TM_DS18B20_Resolution_t)res);
// Get resolution
res = TM_DS18B20_GetResolution(dev,ow_devices[dev].roms[ds_dev-1]);
if (res != TM_DS18B20_Resolution_9bits &&
res!=TM_DS18B20_Resolution_10bits &&
res!=TM_DS18B20_Resolution_11bits &&
res!=TM_DS18B20_Resolution_12bits ) {
res = TM_DS18B20_Resolution_10bits;
}
}
return res;
}
/*
* Operation functions
*/
//-----------------------------------------------------
driver_error_t *ds1820_setup(sensor_instance_t *unit) {
// DS1820 specific setup, check for devices on the bus
uint8_t dev = unit->setup.owire.owdevice;
uint8_t ds_dev = unit->setup.owire.owsensor;
ds_dev = owire_addess_to_dev(dev, ds_dev);
// Set default resolution to 10 bit
unit->properties[0].integerd.value = 10;
uint8_t numDS182 = numDS1820dev(dev);
if ((numDS182 == 0) || (ds_dev > numDS182) || (ds_dev == 0)) {
return driver_setup_error(SENSOR_DRIVER, OWIRE_ERR_INVALID_CHANNEL, "device not on bus");
}
// check for DS1820 device
if (!TM_DS18B20_Is(&(ow_devices[dev].roms[ds_dev-1][0]))) {
return driver_setup_error(SENSOR_DRIVER, OWIRE_ERR_INVALID_CHANNEL, "not DS1820 device");
}
// Set default resolution (10 bits)
unit->properties[0].integerd.value = _set_resolution(10, dev, ds_dev);
// Set exfunc values
//unit->data[1].exfuncd.value = EXFUNC_DS1820_GETROM;
// unit->data[2].exfuncd.value = EXFUNC_DS1820_GETTYPE;
//unit->data[3].exfuncd.value = EXFUNC_DS1820_GETRESOLUTION;
// unit->data[4].exfuncd.value = EXFUNC_OWIRE_LISTDEV;
//unit->data[5].exfuncd.value = EXFUNC_DS1820_NUMDEV;
return NULL;
}
//--------------------------------------------------------------------------------------------
driver_error_t *ds1820_set(sensor_instance_t *unit, const char *id, sensor_value_t *property) {
if (strcmp(id,"resolution") == 0) {
unsigned char ds_dev = unit->setup.owire.owsensor;
uint8_t dev = unit->setup.owire.owdevice;
ds_dev = owire_addess_to_dev(dev, ds_dev);
memcpy(&unit->properties[0], property, sizeof(sensor_value_t));
// Set sensor's resolution
unit->properties[0].integerd.value = _set_resolution(property->integerd.value, dev, ds_dev);
}
return NULL;
}
//-------------------------------------------------------------------------------
driver_error_t *ds1820_acquire(sensor_instance_t *unit, sensor_value_t *values) {
unsigned char sens = unit->setup.owire.owsensor - 1;
uint8_t dev = unit->setup.owire.owdevice;
sens = owire_addess_to_dev(dev, sens);
owState_t stat;
double temper;
uint16_t measure_time = 900;
// set measure time, it depends on resolution
switch (unit->properties[0].integerd.value) {
case 9:
measure_time = 150;
break;
case 10:
measure_time = 250;
break;
case 11:
measure_time = 450;
break;
case 12:
measure_time = 850;
break;
}
/* Start temperature conversion on all devices on one bus
TM_DS18B20_StartAll(dev);
*/
// Start temperature conversion on device
if (TM_DS18B20_Start(dev, (unsigned char *)&ow_devices[dev].roms[sens]) != ow_OK) {
values[0].floatd.value = -9997.0;
return NULL;
}
// Wait until measurement finished
if (ds_parasite_pwr) {
vTaskDelay(measure_time / portTICK_RATE_MS);
// Set owire pin to input mode
owdevice_input(dev);
}
else {
for (int mtime = 0; mtime < measure_time; mtime += 10) {
vTaskDelay(10 / portTICK_RATE_MS);
if (TM_OneWire_ReadBit(dev)) break;
}
}
vTaskDelay(10 / portTICK_RATE_MS);
if (!TM_OneWire_ReadBit(dev)) {
/* Timeout */
values[0].floatd.value = -9998.0;
return NULL;
}
// Read temperature from selected device
// Read temperature from ROM address and store it to temper variable
stat = TM_DS18B20_Read(dev, ow_devices[dev].roms[sens], &temper);
if ( stat == ow_OK) {
values[0].floatd.value = temper;
}
else {
// Reading error
values[0].floatd.value = -9999.0;
}
return NULL;
}
driver_error_t *ds1820_get(sensor_instance_t *unit, const char *id, sensor_value_t *property) {
if (strcmp(id,"numdev") == 0) {
property->integerd.value = ds1820_numdev(unit);
} else if (strcmp(id,"rom") == 0) {
// Free previous value, if needed
if (property->stringd.value) {
free(property->stringd.value);
}
// Allocate space for buffer
char *buffer = (char *)calloc(1, 32);
if (!buffer) {
return driver_operation_error(SENSOR_DRIVER, SENSOR_ERR_NOT_ENOUGH_MEMORY, NULL);
}
ds1820_getrom(unit, buffer);
property->stringd.value = buffer;
} else if (strcmp(id,"type") == 0) {
// Free previous value, if needed
if (property->stringd.value) {
free(property->stringd.value);
}
// Allocate space for buffer
char *buffer = (char *)calloc(1, 32);
if (!buffer) {
return driver_operation_error(SENSOR_DRIVER, SENSOR_ERR_NOT_ENOUGH_MEMORY, NULL);
}
ds1820_gettype(unit, buffer);
property->stringd.value = buffer;
}
return NULL;
}
#endif