- Sponsor
-
Notifications
You must be signed in to change notification settings - Fork 27
/
armbianio.c
825 lines (746 loc) · 21.6 KB
/
armbianio.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
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
//
// Armbian IO library
//
// Copyright (c) 2017 BitBank Software, Inc.
// written by Larry Bank
// email: bitbank@pobox.com
// Project started 11/12/2017
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
//
#include <unistd.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdint.h>
#include <fcntl.h>
#include <sys/ioctl.h>
#include <linux/types.h>
#include "armbianio.h"
#include <linux/spi/spidev.h>
#include <linux/i2c-dev.h>
#include <pthread.h>
#include <poll.h>
static struct spi_ioc_transfer xfer;
// Maximum header pins for all supported boards
#define MAX_PINS IR_PIN+1
static int iPinHandles[MAX_PINS]; // keep file handles open for GPIO access
static AIOCALLBACK cbList[MAX_PINS];
static AIOIRCALLBACK cbIRList[MAX_PINS];
//
// The following are lists which translate pin numbers into the GPIO numbers
// used by the different boards. The first entry (0) is for the on-board
// button (if present). A -1 indicates that the pin is not available to use
// as a GPIO (e.g. +5V, GND, etc). The numbering normally starts with the 3.3v
// pin as 1 and the 5V pin as 2. The TTY header comes after the last GPIO pin
// and is numbered from the pin closest to the edge of the board. On the
// Orange Pi Zero, this means that GND is pin 27, RX is 28 and TX is 29. The
// reason these are included is because they are multiplexed inside the SoC
// and can be used for GPIOs as well.
//
// Le potato
static int ipotatoPins[] = {-1,-1,-1,5,-1,4,-1,108,101,-1,
102,-1,6,9,-1,110,103,-1,104,97,
-1,98,89,100,99,-1,90,85,86,106,
-1,107,105,95,-1,96,91,94,92,-1,
93};
// Banana Pi M2 Zero
static int iBPIZPins[] = {355,-1,-1,12,-1,11,-1,6,13,-1,
14,1,110,0,-1,3,15,-1,68,64,
-1,65,2,66,67,-1,71,19,18,7,
-1,8,354,9,-1,10,356,17,21,-1,
20};
// Raspberry Pi Zero
static int iRPIPins[] = {-1,-1,-1,2,-1,3,-1,4,14,-1,
15,17,18,27,-1,22,23,-1,24,10,
-1,9,25,11,8,-1,7,0,1,5,
-1,6,12,13,-1,19,16,26,20,-1,
21};
static int iWiringPiPins[] = {-1,-1,-1,8,-1,9,-1,7,
15,-1,16,0,1,2,-1,3,
4,-1,5,12,-1,13,6,14,
10,-1,11,30,31,21,-1,22,
26,23,-1,24,27,25,28,-1,
29};
// Orange Pi Zero Plus
static int iOPIZPPins[] = {-1,-1,-1,12,-1,11,-1,6,198,-1,
199,1,7,0,-1,3,19,-1,18,15,
-1,16,2,14,13,-1,10,-1,5,4}; // last 3 pins are TTY header
// Orange Pi Zero Plus 2
static int iOPIZP2ins[] = {-1,-1,-1,12,-1,11,-1,6,0,-1,
1,352,107,353,-1,3,19,-1,18,-1,
-1,-1,2,14,13,-1,110,-1,5,4}; // last 3 pins are TTY header
// Orange Pi One
static int iOPI1Pins[] = {355,-1,-1,12,-1,11,-1,6,13,-1,
14,1,110,0,-1,3,68,-1,71,64,
-1,65,2,66,67,-1,21,19,18,7,
-1,8,200,9,-1,10,201,20,198,-1
,199,4,5,-1}; // last 3 pins are TTY header
// Orange Pi Zero
static int iOPIZPins[] = {-1,-1,-1,12,-1,11,-1,6,198,-1,
199,1,7,0,-1,3,19,-1,18,15,
-1,16,2,14,13,-1,10,-1,5,4}; // last 3 pins are TTY header
// NanoPi Duo
static int iNPDPins[] = {355,5,-1,4,-1,-1,-1,11,-1,12,
363,13,203,14,-1,16,-1,15,-1,199,
-1,198,-1,-1,-1,-1,-1,-1,-1,-1,
-1,-1,-1};
// NanoPi 2
static int iNP2Pins[] = {0,-1,-1,99,-1,98,-1,32+28,96+21,-1,
96+17,32+29,32+26,32+30,-1,32+31,64+14,-1,32+27,64+31,
-1,96+0,96+1,64+29,64+30,-1,64+13,103,102,64+8,
-1,64+9,64+28,64+10,-1,64+12,64+7,64+11,162,-1,
163};
// NanoPi K2
static int iNPK2Pins[] = {3,-1,-1,205,-1,206,-1,211,102,-1,
225,212,227,213,-1,214,226,-1,215,216,
-1,218,217,220,219,-1,221,207,208,222,
-1,127,223,155,-1,252,-1,-1,-1,-1,
-1};
// NanoPi Neo & NanoPi Air & NanoPi Neo 2
static int iNPNPins[] = {-1,-1,-1,12,-1,11,-1,203,198,-1,
199,0,6,2,-1,3,200,-1,201,64,
-1,65,1,66,67,-1,-1,-1,-1,-1,
363,17,-1,-1,-1,-1,-1,-1,-1,4,
5};
// NanoPi M4
static int iNPM4Pins[] = {-1,-1,-1,-1,-1,-1,-1,32,145,-1,144,
33,50,35,-1,36,54,-1,55,-1,-1,
-1,56,-1,-1,-1,149,-1,-1,-1,
-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1};
// Tinkerboard
static int iTinkerPins[] = {-1,-1,-1,252,-1,253,-1,17,161,-1,
160,164,184,166,-1,167,162,-1,163,257,
-1,256,171,254,255,-1,251,233,234,165,
-1,168,239,238,-1,185,223,224,187,-1,
188};
// Radxa Zero
static int iRadxaZeroPins[] = {-1,-1,-1,490,-1,491,-1,415,412,-1,
413,414,501,503,-1,-1,502,-1,500,447,
-1,448,475,450,449,-1,-1,415,414,-1,
-1,-1,416,-1,-1,420,451,421,422,-1,
423};
// Mango Pi
static int iMangoPiPins[] = {-1,-1,-1,264,-1,263,-1,266,112,-1,
111,47,257,79,-1,269,270,-1,228,44,
-1,77,262,-1,-1,-1,-1,266,265,267,
-1,268,261,271,-1,258,234,272,260,-1,
259,233};
static int *iPinLists[] = {ipotatoPins, iBPIZPins, iRPIPins, iOPIZPPins, iOPIZP2ins, iOPIZPins, iOPI1Pins, iOPI1Pins,
iNPDPins, iNP2Pins, iNPK2Pins, iNPNPins, iNPNPins, iNPNPins, iNPM4Pins, iNPM4Pins,
iTinkerPins, iRadxaZeroPins, iMangoPiPins};
static const char *szBoardNames[] = {"Le potato\n","Banana Pi M2 Zero\n","Raspberry Pi","Orange Pi Zero Plus\n",
"Orange Pi Zero Plus 2\n","Orange Pi Zero\n","Orange Pi Lite\n","Orange Pi One\n",
"NanoPi Duo\n", "NanoPi 2\n", "Nanopi K2\n", "NanoPi Neo\n", "NanoPi Air\n",
"NanoPi Neo 2\n", "NanoPi M4\n", "NanoPi M4V2\n", "Tinkerboard\n", "Radxa Zero\n",
"Mango Pi Mcore\n", NULL};
static int iBoardType;
static int iPinCount[] = {40,40,40,29,29,29,43,43,32,40,40,40,40,40,40,41,41,40,41}; // number of pins in the header
// GPIO number of on-board IR receiver
static int iIR_GPIO[] = {7, 0, 0, 363, 363, 363, 363, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0};
//
// Close any open handles to GPIO pins and
// 'unexport' them
//
void AIOShutdown(void)
{
int i;
for (i=0; i<MAX_PINS; i++) // try to close/release all open GPIO pins
{
AIORemoveGPIO(i);
}
} /* AIOShutdown() */
//
// Initialize the ArmbianIO library
// Convenience function calls AIOInitBoard with NULL
//
int AIOInit(void)
{
return AIOInitBoard(NULL);
}
//
// Initialize the ArmbianIO library
// Determines the board type (name) and initializes the 'key' if present
//
int AIOInitBoard(const char *pBoardName)
{
FILE *ihandle;
char szTemp[256];
int i;
// Determine what board we're running on to know which GPIO
// pin number table to use
szTemp[0] = 0;
if (pBoardName)
{
strcpy(szTemp, pBoardName);
}
else
{
ihandle = fopen("/run/machine.id", "rb");
if (ihandle != NULL)
{
i = fread(szTemp, 1, 255, ihandle);
fclose(ihandle);
szTemp[i] = 0; // make sure it's zero terminated
}
}
// see if the board name matches known names
i = 0;
iBoardType = -1;
while (szBoardNames[i] != NULL)
{
if (strcmp(szBoardNames[i], szTemp) == 0) // found it!
{
iBoardType = i;
break;
}
i++;
}
if (iBoardType == -1) // not found
{
fprintf(stderr, "Unrecognized board type, aborting...\n");
return 0;
}
// Initialize all GPIO file system handles to -1 to start
memset(iPinHandles, -1, sizeof(iPinHandles));
// Try to activate the GPIO input for the key/button (if there is one)
AIOAddGPIO(0, GPIO_IN);
return 1; // success
} /* AIOInit() */
//
// Boolean indicating if the current PCB has an on-board IR receiver module
//
int AIOHasIR(void)
{
if (iBoardType != -1)
{
return (iIR_GPIO[iBoardType] != 0);
}
return 0;
} /* AIOHasIR() */
//
// Boolean indicating if the current PCB has a button/key on it
//
int AIOHasButton(void)
{
int *pPins;
if (iBoardType != -1)
{
pPins = iPinLists[iBoardType];
return (pPins[0] != -1); // if the GPIO number at index 0 is valid
}
return 0;
} /* AIOHasButton() */
//
// Read the boolean value of the key/button on the board
// A 0 indicates pressed (pulled to ground) and 1 indicates not pressed
//
int AIOReadButton(void)
{
if (iBoardType != -1)
{
return AIOReadGPIO(0);
}
return 0;
} /* AIOReadButton() */
//
// Returns the number of pins for the current board
// This can include the 3 pins for the TTY header since the RX/TX lines can also
// be used as ordinary GPIO inputs/outputs
//
int AIOPinCount(void)
{
if (iBoardType != -1)
{
return iPinCount[iBoardType];
}
return 0;
} /* AIOPinCount() */
//
// Simultaneous read/write to SPI bus
//
int AIOReadWriteSPI(int iHandle, unsigned char *pTxBuf, unsigned char *pRxBuf, int iLen)
{
int rc;
xfer.rx_buf = (unsigned long)pRxBuf;
xfer.tx_buf = (unsigned long)pTxBuf;
xfer.len = iLen;
rc = ioctl(iHandle, SPI_IOC_MESSAGE(1), &xfer);
return rc;
} /* AIOReadWriteSPI() */
//
// Read from SPI bus
//
int AIOReadSPI(int iHandle, unsigned char *buf, int iLen)
{
int rc;
xfer.rx_buf = (unsigned long)buf;
xfer.tx_buf = 0;
xfer.len = iLen;
rc = ioctl(iHandle, SPI_IOC_MESSAGE(1), &xfer);
return rc;
} /* AIOReadSPI() */
//
// Write to SPI bus
//
int AIOWriteSPI(int iHandle, unsigned char *pBuf, int iLen)
{
int rc;
xfer.rx_buf = 0;
xfer.tx_buf = (unsigned long)pBuf;
xfer.len = iLen;
rc = ioctl(iHandle, SPI_IOC_MESSAGE(1), &xfer);
return rc;
} /* AIOWriteSPI() */
int AIOOpenI2C(int iChannel, int iAddress)
{
char filename[32];
int file_i2c;
sprintf(filename, "/dev/i2c-%d", iChannel);
if ((file_i2c = open(filename, O_RDWR)) < 0)
{
fprintf(stderr, "Failed to open the i2c bus\n");
return -1;
}
if (ioctl(file_i2c, I2C_SLAVE, iAddress) < 0)
{
fprintf(stderr, "Failed to acquire bus access or talk to slave\n");
return -1;
}
return file_i2c;
} /* AIOOpenI2C() */
void AIOCloseI2C(int iHandle)
{
close(iHandle);
} /* AIOCloseI2C() */
int AIOReadI2C(int iHandle, unsigned char ucRegister, unsigned char *buf, int iCount)
{
int rc;
// Reading from an I2C device involves first writing the 8-bit register
// followed by reading the data
rc = write(iHandle, &ucRegister, 1); // write the register value
if (rc == 1)
{
rc = read(iHandle, buf, iCount);
}
return rc;
} /* AIOReadI2C() */
int AIOWriteI2C(int iHandle, unsigned char ucRegister, unsigned char *buf, int iCount)
{
int rc;
unsigned char ucTemp[2048];
// Writing to an I2C device involves first writing the 8-bit register
// followed by writing the data
ucTemp[0] = ucRegister; // some devices need it written atomically
memcpy(&ucTemp[1], buf, iCount);
rc = write(iHandle, ucTemp, iCount+1);
return rc;
} /* AIOWriteI2C() */
//
// Read from a GPIO pin
//
int AIOReadGPIO(int iPin)
{
int iGPIO = 0;
char szTemp[64];
int rc;
int *pPins;
if (iBoardType == -1) // library not initialized
return -1;
if (iPin < 0 || (iPin != IR_PIN && iPin > iPinCount[iBoardType])) // invalid pin number for this board
return -1;
if (iPin == IR_PIN && iIR_GPIO[iBoardType] == 0) // no IR receiver
return -1;
if (iPinHandles[iPin] == -1)
{
pPins = iPinLists[iBoardType];
if (iPin == IR_PIN)
iGPIO = iIR_GPIO[iBoardType];
else
iGPIO = pPins[iPin];
sprintf(szTemp, "/sys/class/gpio/gpio%d/value", iGPIO);
iPinHandles[iPin] = open(szTemp, O_RDONLY);
}
lseek(iPinHandles[iPin], 0, SEEK_SET); // reset file pointer to start
rc = read(iPinHandles[iPin], szTemp, 1);
if (rc <= 0) // problem
{
fprintf(stderr, "Error reading from GPIO %d\n", iGPIO);
return -1;
}
return (szTemp[0] == '1');
} /* AIOReadGPIO() */
//
// Write a 0 or 1 to a GPIO output line
//
int AIOWriteGPIO(int iPin, int iValue)
{
int rc, iGPIO;
char szTemp[64];
int *pPins;
if (iBoardType == -1) // not initialized
{
printf("not init the iBoardType\n");
return 0;
}
if (iPin < 1 || iPin > iPinCount[iBoardType])
{
printf("iPin:%d is not ok max:%d\n", iPin, iPinCount[iBoardType]);
return 0;
}
if (iPinHandles[iPin] == -1) // not open yet
{
pPins = iPinLists[iBoardType];
iGPIO = pPins[iPin]; // convert to GPIO number
sprintf(szTemp, "/sys/class/gpio/gpio%d/value", iGPIO);
iPinHandles[iPin] = open(szTemp, O_WRONLY);
}
if (iValue)
rc = write(iPinHandles[iPin], "1", 1);
else
rc = write(iPinHandles[iPin], "0", 1);
if (rc < 0) // error
{
printf("write pin %d failed\n", iPinHandles[iPin]);
}
return 1;
} /* AIOWriteGPIO() */
//
// Set edge value for an open pin
//
int AIOWriteGPIOEdge(int iPin, int iEdge)
{
char szName[64];
int file_gpio, rc, iGPIO;
int *pPins;
char *szEdges[] = {"falling\n","rising\n","both\n","none\n"};
if (iEdge < EDGE_FALLING || iEdge > EDGE_NONE)
return 0;
if (iBoardType == -1) // not initialized
return 0;
if (iPin < 0 || (iPin != IR_PIN && iPin > iPinCount[iBoardType]))
return 0;
pPins = iPinLists[iBoardType];
// Set the mapped pin
if (iPin == IR_PIN)
iGPIO = iIR_GPIO[iBoardType];
else
iGPIO = pPins[iPin];
sprintf(szName, "/sys/class/gpio/gpio%d/edge", iGPIO);
file_gpio = open(szName, O_WRONLY);
// Write edge type
rc = write(file_gpio, szEdges[iEdge], strlen(szEdges[iEdge]));
close(file_gpio);
if (rc < 0) // error
{ // do something
}
return 1;
} /* AIOWriteGPIOEdge() */
//
// GPIO Monitoring thread (one for each pin)
//
void *GPIOThread(void *param)
{
int iPin = (int)param; // pin number is passed in
struct pollfd fdset[1];
char szName[32], szTemp[64];
int gpio_fd;
int *pPins, rc, iGPIO;
int timeout = 3000; // 3 seconds
pPins = iPinLists[iBoardType];
if (iPin == IR_PIN)
iGPIO = iIR_GPIO[iBoardType];
else
iGPIO = pPins[iPin];
sprintf(szName, "/sys/class/gpio/gpio%d/value", iGPIO);
gpio_fd = open(szName, O_RDONLY);
if (gpio_fd < 0) // something went wrong
return NULL;
lseek(gpio_fd, 0, SEEK_SET);
rc = read(gpio_fd, szTemp, 64); // initial read to prevent false interrupt
while (1)
{
// If the callback is NULL then exit thread
if (cbList[iPin] == NULL)
return NULL;
memset(fdset, 0, sizeof(fdset));
fdset[0].fd = gpio_fd;
fdset[0].events = POLLPRI;
rc = poll(&fdset[0], 1, timeout);
if (rc < 0) return NULL;
// clear the interrupt by reading the data
lseek(gpio_fd, 0, SEEK_SET);
rc = read(gpio_fd, szTemp, 64);
// see if it was a valid interrupt event
if (fdset[0].revents & POLLPRI)
{
if (cbList[iPin])
(*cbList[iPin])(iPin);
}
}
return NULL;
} /* GPIOThread() */
//
// Set edge to call the given function when the state
// changes. AIOAddGPIO must be called first with direction
// set to GPIO_IN
//
int AIOAddGPIOCallback(int iPin, AIOCALLBACK callback)
{
int *pPins;
pthread_t tinfo;
if (iBoardType == -1) // not initialize
return 0;
pPins = iPinLists[iBoardType];
if (iPin != IR_PIN && pPins[iPin] == -1) // invalid pin
return 0;
cbList[iPin] = callback; // save the callback pointer
// Start a thread to manage the interrupt/callback
pthread_create(&tinfo, NULL, GPIOThread, (void *)iPin);
return 1;
} /* AIOAddGPIOCallback() */
//
// Set pointer in callback list to NULL to cause
// thread to exit
//
int AIORemoveGPIOCallback(int iPin)
{
if (iBoardType == -1) // not initialize
return 0;
if (cbList[iPin] == NULL) // invalid pin
return 0;
cbList[iPin] = NULL; // This will force thread to exit
return 1;
} /* AIORemoveGPIOCallback() */
long getTimeInMicroseconds()
{
struct timespec time_p;
clock_gettime(CLOCK_MONOTONIC, &time_p);
return (time_p.tv_sec % 10) * 1000000 + time_p.tv_nsec / 1000;
}
//
// GPIO Monitoring thread for IR (one for each pin)
// Code length must be less than 50.
//
void *GPIOIRThread(void *param)
{
int iPin = (int)param; // pin number is passed in
int endOfCodeTimeOut = 3; // after 3 ms we think code has ended.
struct pollfd fdset[1];
char szName[32], szTemp[64];
int gpio_fd;
int *pPins, rc, iGPIO;
int timeout = 3000; // 3 seconds
long start = getTimeInMicroseconds();
int currentCode[52];
int i, codePointer = 0;
pPins = iPinLists[iBoardType];
if (iPin == IR_PIN)
iGPIO = iIR_GPIO[iBoardType];
else
iGPIO = pPins[iPin];
sprintf(szName, "/sys/class/gpio/gpio%d/value", iGPIO);
gpio_fd = open(szName, O_RDONLY);
if (gpio_fd < 0) // something went wrong
return NULL;
lseek(gpio_fd, 0, SEEK_SET);
rc = read(gpio_fd, szTemp, 64); // initial read to prevent false interrupt
while (1)
{
// If the callback is NULL then exit thread
if (cbIRList[iPin] == NULL)
return NULL;
memset(fdset, 0, sizeof(fdset));
fdset[0].fd = gpio_fd;
fdset[0].events = POLLPRI;
rc = poll(&fdset[0], 1, timeout);
if (rc < 0) return NULL;
// clear the interrupt by reading the data
lseek(gpio_fd, 0, SEEK_SET);
rc = read(gpio_fd, szTemp, 64);
// see if it was a valid interrupt event
if (fdset[0].revents & POLLPRI)
{
long now = getTimeInMicroseconds();
long between = now - start;
// printf("between: %11d\n", between);
currentCode[codePointer] = (int) between;
codePointer++;
timeout = endOfCodeTimeOut;
start = now;
// printf("cp: %d", codePointer);
if(codePointer > 50) { // max code length reached, send what we have.
if (cbIRList[iPin])
(*cbIRList[iPin])(currentCode);
codePointer = 0;
for(i = 0; i < 50; i++) { currentCode[i] = 0; }
}
} else if(timeout == endOfCodeTimeOut) { // are we receiving a code currently?
//printf("Between: %d\n", getTimeInMicroseconds() - start);
if (cbIRList[iPin])
(*cbIRList[iPin])(currentCode);
timeout = 3000; // wait for next code again, with the default timeout
codePointer = 0;
for(i = 0; i < 50; i++) { currentCode[i] = 0; }
} else {
printf("Code timeout\n");
}
}
return NULL;
} /* GPIOIRThread() */
int AIOAddGPIOIRCallback(int iPin, AIOIRCALLBACK callback)
{
int *pPins;
pthread_t tinfo;
if (iBoardType == -1) // not initialize
return 0;
pPins = iPinLists[iBoardType];
if (iPin != IR_PIN && pPins[iPin] == -1) // invalid pin
return 0;
cbIRList[iPin] = callback; // save the callback pointer
// Start a thread to manage the interrupt/callback
pthread_create(&tinfo, NULL, GPIOIRThread, (void *)iPin);
return 1;
} /* AIOAddGPIOCallback() */
int AIORemoveGPIOIRCallback(int iPin)
{
if (iBoardType == -1) // not initialize
return 0;
if (cbIRList[iPin] == NULL) // invalid pin
return 0;
cbIRList[iPin] = NULL; // This will force thread to exit
return 1;
} /* AIORemoveGPIOIRCallback() */
//
// Initialize a GPIO line for input or output
// This will export it to the sysfs driver and
// it will appear in /sys/class/gpio
//
int AIOAddGPIO(int iPin, int iDirection)
{
char szName[64];
int file_gpio, rc, iGPIO;
int *pPins;
if (iBoardType == -1) // not initialize
return 0;
pPins = iPinLists[iBoardType];
if (iPin != IR_PIN && pPins[iPin] == -1) // invalid pin
return 0;
if (iPin == IR_PIN && iIR_GPIO[iBoardType] == 0)
return 0; // invalid IR pin
file_gpio = open("/sys/class/gpio/export", O_WRONLY);
if (file_gpio < 1) {
fprintf(stderr, "Error opening /sys/class/gpio/export = %d\n", errno);
return 0;
}
if (iPin == IR_PIN)
iGPIO = iIR_GPIO[iBoardType];
else
iGPIO = pPins[iPin];
sprintf(szName, "%d", iGPIO);
rc = write(file_gpio, szName, strlen(szName));
close(file_gpio);
usleep(200000); // allow time for udev to make the needed changes
sprintf(szName, "/sys/class/gpio/gpio%d/direction", iGPIO);
file_gpio = open(szName, O_WRONLY);
if (file_gpio < 1) {
fprintf(stderr, "error setting direction on GPIO pin %d\n", iGPIO);
return 0;
}
if (iDirection == GPIO_OUT)
rc = write(file_gpio, "out\n", 4);
else
rc = write(file_gpio, "in\n", 3);
close(file_gpio);
if (iDirection == GPIO_IN_PULLUP) // RPI specific feature, use GPIO library
{
sprintf(szName, "gpio mode %d up", iWiringPiPins[iPin]);
system(szName);
}
if (rc < 0)
{
fprintf(stderr, "Error setting mode on GPIO pin %d\n", iGPIO);
}
return 1;
} /* AIOAddGPIO() */
//
// Remove access to a GPIO pin
// This will 'unexport' it from the sysfs driver
// and remove it from the /sys/class/gpio directory
//
void AIORemoveGPIO(int iPin)
{
int file_gpio, rc;
char szTemp[64];
int *pPins;
if (iBoardType == -1) // not initialized
return;
if (iPin < 1 || iPin > MAX_PINS) // invalid pin
return;
if (iPinHandles[iPin] != -1)
{
close(iPinHandles[iPin]);
file_gpio = open("/sys/class/gpio/unexport", O_WRONLY);
pPins = iPinLists[iBoardType];
sprintf(szTemp, "%d", pPins[iPin]);
rc = write(file_gpio, szTemp, strlen(szTemp));
close(file_gpio);
if (rc < 0) // suppress compiler warning
{ // do nothing
}
iPinHandles[iPin] = -1;
}
} /* AIORemoveGPIO() */
//
// Open a handle to the SPI bus
//
int AIOOpenSPI(int iChannel, int iSPIFreq)
{
int rc, iSPIMode = SPI_MODE_0; // | SPI_NO_CS;
char szName[32];
int file_spi;
int i = iSPIFreq;
sprintf(szName,"/dev/spidev%d.0", iChannel);
file_spi = open(szName, O_RDWR);
rc = ioctl(file_spi, SPI_IOC_WR_MODE, &iSPIMode);
if (rc < 0) fprintf(stderr, "Error setting SPI mode\n");
rc = ioctl(file_spi, SPI_IOC_WR_MAX_SPEED_HZ, &i);
if (rc < 0) fprintf(stderr, "Error setting SPI speed\n");
memset(&xfer, 0, sizeof(xfer));
xfer.speed_hz = iSPIFreq;
xfer.cs_change = 0;
xfer.delay_usecs = 0;
xfer.bits_per_word = 8;
if (file_spi < 0)
{
fprintf(stderr, "Failed to open the SPI bus\n");
return -1;
}
return file_spi;
} /* AIOOpenSPI() */
void AIOCloseSPI(int iHandle)
{
close(iHandle);
} /* AIOCloseSPI() */
//
// Returns the name of the board (if recognized)
//
const char * AIOGetBoardName(void)
{
if (iBoardType == -1)
return "Unknown";
else
return szBoardNames[iBoardType];
} /* AIOGetBoardName() */