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
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
|
/****************************************************************************
* drivers/input/stmpe11_tsc.c
*
* Copyright (C) 2012 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <gnutt@nuttx.org>
*
* References:
* "STMPE811 S-Touch� advanced resistive touchscreen controller with 8-bit
* GPIO expander," Doc ID 14489 Rev 6, CD00186725, STMicroelectronics"
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* 3. Neither the name NuttX nor the names of its contributors may be
* used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <sys/types.h>
#include <stdbool.h>
#include <stdio.h>
#include <unistd.h>
#include <string.h>
#include <fcntl.h>
#include <semaphore.h>
#include <poll.h>
#include <errno.h>
#include <assert.h>
#include <debug.h>
#include <nuttx/kmalloc.h>
#include <nuttx/arch.h>
#include <nuttx/fs/fs.h>
#include <nuttx/i2c.h>
#include <nuttx/wqueue.h>
#include <nuttx/arch.h>
#include <nuttx/input/touchscreen.h>
#include <nuttx/input/stmpe11.h>
#include "stmpe11.h"
#if defined(CONFIG_INPUT) && defined(CONFIG_INPUT_STMPE11) && !defined(CONFIG_STMPE11_TSC_DISABLE)
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
#define Direction_IN 0x00
#define Direction_OUT 0x01
#define Polarity_Low 0x00
#define Polarity_High 0x04
#define Type_Level 0x00
#define Type_Edge 0x02
#define IO_IT_0 0x01
#define IO_IT_1 0x02
#define IO_IT_2 0x04
#define IO_IT_3 0x08
#define IO_IT_4 0x10
#define IO_IT_5 0x20
#define IO_IT_6 0x40
#define IO_IT_7 0x80
#define ALL_IT 0xFF
#define IOE_JOY_IT (uint8_t)(IO_IT_3 | IO_IT_4 | IO_IT_5 | IO_IT_6 | IO_IT_7)
#define IOE_TS_IT (uint8_t)(IO_IT_0 | IO_IT_1 | IO_IT_2)
#define IOE_INMEMS_IT (uint8_t)(IO_IT_2 | IO_IT_3)
#define EDGE_FALLING 0x01
#define EDGE_RISING 0x02
#define TIMEOUT_MAX 0x3000 /*<! The value of the maximal timeout for I2C waiting loops */
/****************************************************************************
* Private Types
****************************************************************************/
/****************************************************************************
* Private Function Prototypes
****************************************************************************/
/* Internal logic */
static void stmpe11_notify(FAR struct stmpe11_dev_s *priv);
static int stmpe11_sample(FAR struct stmpe11_dev_s *priv,
FAR struct stmpe11_sample_s *sample);
static inline int stmpe11_waitsample(FAR struct stmpe11_dev_s *priv,
FAR struct stmpe11_sample_s *sample);
/* Character driver methods */
static int stmpe11_open(FAR struct file *filep);
static int stmpe11_close(FAR struct file *filep);
static ssize_t stmpe11_read(FAR struct file *filep, FAR char *buffer,
size_t len);
static int stmpe11_ioctl(FAR struct file *filep, int cmd,
unsigned long arg);
#ifndef CONFIG_DISABLE_POLL
static int stmpe11_poll(FAR struct file *filep, struct pollfd *fds,
bool setup);
#endif
/* Initialization logic */
static inline void stmpe11_tscinitialize(FAR struct stmpe11_dev_s *priv);
/****************************************************************************
* Private Data
****************************************************************************/
/* This the the vtable that supports the character driver interface */
static const struct file_operations g_stmpe11fops =
{
stmpe11_open, /* open */
stmpe11_close, /* close */
stmpe11_read, /* read */
0, /* write */
0, /* seek */
stmpe11_ioctl /* ioctl */
#ifndef CONFIG_DISABLE_POLL
, stmpe11_poll /* poll */
#endif
};
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Name: stmpe11_notify
*
* Description:
* Notify any threads waiting on touchscreen data that data is now
* available for reading.
*
****************************************************************************/
static void stmpe11_notify(FAR struct stmpe11_dev_s *priv)
{
#ifndef CONFIG_DISABLE_POLL
int i;
#endif
/* If there are threads waiting for read data, then signal one of them
* that the read data is available.
*/
if (priv->nwaiters > 0)
{
/* After posting this semaphore, we need to exit because the STMPE11
* is no longer available.
*/
sem_post(&priv->waitsem);
}
/* If there are threads waiting on poll() for STMPE11 data to become available,
* then wake them up now. NOTE: we wake up all waiting threads because we
* do not know that they are going to do. If they all try to read the data,
* then some make end up blocking after all.
*/
#ifndef CONFIG_DISABLE_POLL
for (i = 0; i < CONFIG_STMPE11_NPOLLWAITERS; i++)
{
struct pollfd *fds = priv->fds[i];
if (fds)
{
fds->revents |= POLLIN;
ivdbg("Report events: %02x\n", fds->revents);
sem_post(fds->sem);
}
}
#endif
}
/****************************************************************************
* Name: stmpe11_sample
*
* Description:
* Check if touchscreen sample data is available now and, if so, return
* the sample data. This is part of the stmpe11_read logic.
*
* Assumption:
* Pre-emption is disable to prevent the worker thread from running.
* Otherwise, sampled data may continue to change.
*
****************************************************************************/
static int stmpe11_sample(FAR struct stmpe11_dev_s *priv,
FAR struct stmpe11_sample_s *sample)
{
int ret = -EAGAIN;
/* Is there new STMPE11 sample data available? */
if (priv->penchange)
{
/* Yes.. the state has changed in some way. Return a copy of the
* sampled data.
*/
memcpy(sample, &priv->sample, sizeof(struct stmpe11_sample_s));
/* Now manage state transitions */
if (sample->contact == CONTACT_UP)
{
/* The sampling logic has detected pen-up in some condition other
* than CONTACT_NONE. Set the next state to CONTACT_NONE: Further
* pen-down reports will be ignored. Increment the ID so that
* next contact ID will be unique
*/
priv->sample.contact = CONTACT_NONE;
priv->id++;
}
else if (sample->contact == CONTACT_DOWN)
{
/* The sampling logic has detected pen-up in some condition other
* than CONTACT_MOVE. Set the next state to CONTACT_MOVE: Further
* samples collected while the pen is down will reported as movement
* events.
*/
priv->sample.contact = CONTACT_MOVE;
}
priv->penchange = false;
ret = OK;
}
return ret;
}
/****************************************************************************
* Name: stmpe11_waitsample
*
* Description:
* Wait for a sample to become available (this is really part of the
* stmpe11_read logic).
*
****************************************************************************/
static inline int stmpe11_waitsample(FAR struct stmpe11_dev_s *priv,
FAR struct stmpe11_sample_s *sample)
{
int ret;
/* Disable pre-emption to prevent the worker thread from running
* asynchronously.
*/
sched_lock();
/* Now release the semaphore that manages mutually exclusive access to
* the device structure. This may cause other tasks to become ready to
* run, but they cannot run yet because pre-emption is disabled.
*/
sem_post(&priv->exclsem);
/* Try to get the a sample... if we cannot, then wait on the semaphore
* that is posted when new sample data is availble.
*/
while (stmpe11_sample(priv, sample) < 0)
{
/* Wait for a change in the STMPE11 state */
priv->nwaiters++;
ret = sem_wait(&priv->waitsem);
priv->nwaiters--;
/* When we are re-awakened, pre-emption will again be disabled */
if (ret < 0)
{
#ifdef CONFIG_DEBUG
// Sample the errno (debug output could change it)
int errval = errno;
/* If we are awakened by a signal, then we need to return
* the failure now.
*/
idbg("sem_wait failed: %d\n", errval);
DEBUGASSERT(errval == EINTR);
#endif
ret = -EINTR;
goto errout;
}
}
/* Re-acquire the the semaphore that manages mutually exclusive access to
* the device structure. We may have to wait here. But we have our sample.
* Interrupts and pre-emption will be re-enabled while we wait.
*/
ret = sem_wait(&priv->exclsem);
errout:
/* Restore pre-emption. We might get suspended here but that is okay
* because we already have our sample. Note: this means that if there
* were two threads reading from the STMPE11 for some reason, the data
* might be read out of order.
*/
sched_unlock();
return ret;
}
/****************************************************************************
* Name: stmpe11_open
*
* Description:
* Standard character driver open method.
*
****************************************************************************/
static int stmpe11_open(FAR struct file *filep)
{
#ifdef CONFIG_STMPE11_REFCNT
FAR struct inode *inode;
FAR struct stmpe11_dev_s *priv;
uint8_t tmp;
int ret;
DEBUGASSERT(filep);
inode = filep->f_inode;
DEBUGASSERT(inode && inode->i_private);
priv = (FAR struct stmpe11_dev_s *)inode->i_private;
/* Get exclusive access to the driver data structure */
ret = sem_wait(&priv->exclsem);
if (ret < 0)
{
/* This should only happen if the wait was canceled by an signal */
DEBUGASSERT(errno == EINTR);
return -EINTR;
}
/* Increment the reference count */
tmp = priv->crefs + 1;
if (tmp == 0)
{
/* More than 255 opens; uint8_t overflows to zero */
ret = -EMFILE;
goto errout_with_sem;
}
/* When the reference increments to 1, this is the first open event
* on the driver.. and an opportunity to do any one-time initialization.
*/
/* Save the new open count on success */
priv->crefs = tmp;
errout_with_sem:
sem_post(&priv->exclsem);
return ret;
#else
return OK;
#endif
}
/****************************************************************************
* Name: stmpe11_close
*
* Description:
* Standard character driver close method.
*
****************************************************************************/
static int stmpe11_close(FAR struct file *filep)
{
#ifdef CONFIG_STMPE11_REFCNT
FAR struct inode *inode;
FAR struct stmpe11_dev_s *priv;
int ret;
DEBUGASSERT(filep);
inode = filep->f_inode;
DEBUGASSERT(inode && inode->i_private);
priv = (FAR struct stmpe11_dev_s *)inode->i_private;
/* Get exclusive access to the driver data structure */
ret = sem_wait(&priv->exclsem);
if (ret < 0)
{
/* This should only happen if the wait was canceled by an signal */
DEBUGASSERT(errno == EINTR);
return -EINTR;
}
/* Decrement the reference count unless it would decrement a negative
* value. When the count decrements to zero, there are no further
* open references to the driver.
*/
if (priv->crefs >= 1)
{
priv->crefs--;
}
sem_post(&priv->exclsem);
#endif
return OK;
}
/****************************************************************************
* Name: stmpe11_read
*
* Description:
* Standard character driver read method.
*
****************************************************************************/
static ssize_t stmpe11_read(FAR struct file *filep, FAR char *buffer, size_t len)
{
FAR struct inode *inode;
FAR struct stmpe11_dev_s *priv;
FAR struct touch_sample_s *report;
struct stmpe11_sample_s sample;
int ret;
ivdbg("len=%d\n", len);
DEBUGASSERT(filep);
inode = filep->f_inode;
DEBUGASSERT(inode && inode->i_private);
priv = (FAR struct stmpe11_dev_s *)inode->i_private;
/* Verify that the caller has provided a buffer large enough to receive
* the touch data.
*/
if (len < SIZEOF_TOUCH_SAMPLE_S(1))
{
/* We could provide logic to break up a touch report into segments and
* handle smaller reads... but why?
*/
return -ENOSYS;
}
/* Get exclusive access to the driver data structure */
ret = sem_wait(&priv->exclsem);
if (ret < 0)
{
/* This should only happen if the wait was canceled by an signal */
DEBUGASSERT(errno == EINTR);
return -EINTR;
}
/* Try to read sample data. */
ret = stmpe11_sample(priv, &sample);
if (ret < 0)
{
/* Sample data is not available now. We would ave to wait to get
* receive sample data. If the user has specified the O_NONBLOCK
* option, then just return an error.
*/
if (filep->f_oflags & O_NONBLOCK)
{
ret = -EAGAIN;
goto errout;
}
/* Wait for sample data */
ret = stmpe11_waitsample(priv, &sample);
if (ret < 0)
{
/* We might have been awakened by a signal */
goto errout;
}
}
/* In any event, we now have sampled STMPE11 data that we can report
* to the caller.
*/
report = (FAR struct touch_sample_s *)buffer;
memset(report, 0, SIZEOF_TOUCH_SAMPLE_S(1));
report->npoints = 1;
report->point[0].id = sample.id;
report->point[0].x = sample.x;
report->point[0].y = sample.y;
report->point[0].pressure = sample.z;
/* Report the appropriate flags */
if (sample.contact == CONTACT_UP)
{
/* Pen is now up */
report->point[0].flags = TOUCH_UP | TOUCH_ID_VALID;
}
else
{
if (sample.contact == CONTACT_DOWN)
{
/* First contact */
report->point[0].flags = TOUCH_DOWN | TOUCH_ID_VALID |
TOUCH_POS_VALID | TOUCH_PRESSURE_VALID;
}
else /* if (sample->contact == CONTACT_MOVE) */
{
/* Movement of the same contact */
report->point[0].flags = TOUCH_MOVE | TOUCH_ID_VALID |
TOUCH_POS_VALID | TOUCH_PRESSURE_VALID;
}
}
ret = SIZEOF_TOUCH_SAMPLE_S(1);
errout:
sem_post(&priv->exclsem);
return ret;
}
/****************************************************************************
* Name: stmpe11_ioctl
*
* Description:
* Standard character driver ioctl method.
*
****************************************************************************/
static int stmpe11_ioctl(FAR struct file *filep, int cmd, unsigned long arg)
{
FAR struct inode *inode;
FAR struct stmpe11_dev_s *priv;
int ret;
ivdbg("cmd: %d arg: %ld\n", cmd, arg);
DEBUGASSERT(filep);
inode = filep->f_inode;
DEBUGASSERT(inode && inode->i_private);
priv = (FAR struct stmpe11_dev_s *)inode->i_private;
/* Get exclusive access to the driver data structure */
ret = sem_wait(&priv->exclsem);
if (ret < 0)
{
/* This should only happen if the wait was canceled by an signal */
DEBUGASSERT(errno == EINTR);
return -EINTR;
}
/* Process the IOCTL by command */
switch (cmd)
{
case TSIOC_SETFREQUENCY: /* arg: Pointer to uint32_t frequency value */
{
FAR uint32_t *ptr = (FAR uint32_t *)((uintptr_t)arg);
DEBUGASSERT(priv->config != NULL && ptr != NULL);
priv->config->frequency = I2C_SETFREQUENCY(priv->i2c, *ptr);
}
break;
case TSIOC_GETFREQUENCY: /* arg: Pointer to uint32_t frequency value */
{
FAR uint32_t *ptr = (FAR uint32_t *)((uintptr_t)arg);
DEBUGASSERT(priv->config != NULL && ptr != NULL);
*ptr = priv->config->frequency;
}
break;
default:
ret = -ENOTTY;
break;
}
sem_post(&priv->exclsem);
return ret;
}
/****************************************************************************
* Name: stmpe11_poll
*
* Description:
* Standard character driver poll method.
*
****************************************************************************/
#ifndef CONFIG_DISABLE_POLL
static int stmpe11_poll(FAR struct file *filep, FAR struct pollfd *fds,
bool setup)
{
FAR struct inode *inode;
FAR struct stmpe11_dev_s *priv;
int ret;
int i;
ivdbg("setup: %d\n", (int)setup);
DEBUGASSERT(filep && fds);
inode = filep->f_inode;
DEBUGASSERT(inode && inode->i_private);
priv = (FAR struct stmpe11_dev_s *)inode->i_private;
/* Are we setting up the poll? Or tearing it down? */
ret = sem_wait(&priv->exclsem);
if (ret < 0)
{
/* This should only happen if the wait was canceled by an signal */
DEBUGASSERT(errno == EINTR);
return -EINTR;
}
if (setup)
{
/* Ignore waits that do not include POLLIN */
if ((fds->events & POLLIN) == 0)
{
idbg("Missing POLLIN: revents: %08x\n", fds->revents);
ret = -EDEADLK;
goto errout;
}
/* This is a request to set up the poll. Find an available
* slot for the poll structure reference
*/
for (i = 0; i < CONFIG_STMPE11_NPOLLWAITERS; i++)
{
/* Find an available slot */
if (!priv->fds[i])
{
/* Bind the poll structure and this slot */
priv->fds[i] = fds;
fds->priv = &priv->fds[i];
break;
}
}
if (i >= CONFIG_STMPE11_NPOLLWAITERS)
{
idbg("No availabled slot found: %d\n", i);
fds->priv = NULL;
ret = -EBUSY;
goto errout;
}
/* Should we immediately notify on any of the requested events? */
if (priv->penchange)
{
stmpe11_notify(priv);
}
}
else if (fds->priv)
{
/* This is a request to tear down the poll. */
struct pollfd **slot = (struct pollfd **)fds->priv;
DEBUGASSERT(slot != NULL);
/* Remove all memory of the poll setup */
*slot = NULL;
fds->priv = NULL;
}
errout:
sem_post(&priv->exclsem);
return ret;
}
#endif
/****************************************************************************
* Name: stmpe11_tscinitialize
*
* Description:
* Initialize the touchscreen controller. This is really a part of the
* stmpe11_register logic,
*
****************************************************************************/
static inline void stmpe11_tscinitialize(FAR struct stmpe11_dev_s *priv)
{
uint8_t regval;
ivdbg("Initializing touchscreen controller\n");
/* Enable TSC and ADC functions */
regval = stmpe11_getreg8(priv, STMPE11_SYS_CTRL2);
regval &= ~(SYS_CTRL2_TSC_OFF | SYS_CTRL2_ADC_OFF);
stmpe11_putreg8(priv, STMPE11_SYS_CTRL2, regval);
/* Enable the TSC global interrupts */
regval = stmpe11_getreg8(priv, STMPE11_INT_EN);
regval |= (uint32_t)(INT_TOUCH_DET | INT_FIFO_TH | INT_FIFO_OFLOW);
stmpe11_putreg8(priv, STMPE11_INT_EN, regval);
/* Select Sample Time, bit number and ADC Reference */
stmpe11_putreg8(priv, STMPE11_ADC_CTRL1, priv->config->ctrl1);
/* Wait for 20 ms */
up_mdelay(20);
/* Select the ADC clock speed */
stmpe11_putreg8(priv, STMPE11_ADC_CTRL2, priv->config->ctrl2);
/* Select TSC pins in non-GPIO mode (AF=0) */
regval = stmpe11_getreg8(priv, STMPE11_GPIO_AF);
regval &= ~(uint8_t)TSC_PIN_SET;
stmpe11_putreg8(priv, STMPE11_GPIO_AF, regval);
/* Select 2 nF filter capacitor */
stmpe11_putreg8(priv, STMPE11_TSC_CFG,
(TSC_CFG_AVE_CTRL_4SAMPLES | TSC_CFG_TOUCH_DELAY_500US | TSC_CFG_SETTLING_500US));
/* Select single point reading */
stmpe11_putreg8(priv, STMPE11_FIFO_TH, 1);
/* Reset and clear the FIFO. */
stmpe11_putreg8(priv, STMPE11_FIFO_STA, FIFO_STA_FIFO_RESET);
stmpe11_putreg8(priv, STMPE11_FIFO_STA, 0);
/* set the data format for Z value: 7 fractional part and 1 whole part */
stmpe11_putreg8(priv, STMPE11_TSC_FRACTIONZ, 0x01);
/* Set the driving capability of the device for TSC pins: 50mA */
stmpe11_putreg8(priv, STMPE11_TSC_IDRIVE, TSC_IDRIVE_50MA);
/* Enable the TSC. Use no tracking index, touch-screen controller
* operation mode (XYZ).
*/
stmpe11_putreg8(priv, STMPE11_TSC_CTRL, TSC_CTRL_EN);
/* Clear all the status pending bits */
stmpe11_putreg8(priv, STMPE11_INT_STA, INT_ALL);
}
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: stmpe11_register
*
* Description:
* Enable TSC functionality. GPIO4-7 must be available. This function
* will register the touchsceen driver as /dev/inputN where N is the minor
* device number
*
* Input Parameters:
* handle - The handle previously returned by stmpe11_register
* minor - The input device minor number
*
* Returned Value:
* Zero is returned on success. Otherwise, a negated errno value is
* returned to indicate the nature of the failure.
*
****************************************************************************/
int stmpe11_register(STMPE11_HANDLE handle, int minor)
{
FAR struct stmpe11_dev_s *priv = (FAR struct stmpe11_dev_s *)handle;
char devname[DEV_NAMELEN];
int ret;
ivdbg("handle=%p minor=%d\n", handle, minor);
DEBUGASSERT(priv);
/* Get exclusive access to the device structure */
ret = sem_wait(&priv->exclsem);
if (ret < 0)
{
int errval = errno;
idbg("sem_wait failed: %d\n", errval);
return -errval;
}
/* Make sure that the pins (4-7) need by the TSC are not already in use */
if ((priv->inuse & TSC_PIN_SET) != 0)
{
idbg("TSC pins is already in-use: %02x\n", priv->inuse);
sem_post(&priv->exclsem);
return -EBUSY;
}
/* Initialize the TS structure to their default values */
priv->minor = minor;
priv->penchange = false;
priv->threshx = 0;
priv->threshy = 0;
/* Register the character driver */
snprintf(devname, DEV_NAMELEN, DEV_FORMAT, minor);
ret = register_driver(devname, &g_stmpe11fops, 0666, priv);
if (ret < 0)
{
idbg("Failed to register driver %s: %d\n", devname, ret);
sem_post(&priv->exclsem);
return ret;
}
/* Initialize the touchscreen controller */
stmpe11_tscinitialize(priv);
/* Inidicate that the touchscreen controller was successfully initialized */
priv->inuse |= TSC_PIN_SET; /* Pins 4-7 are now in-use */
priv->flags |= STMPE11_FLAGS_TSC_INITIALIZED; /* TSC function is initialized */
sem_post(&priv->exclsem);
return ret;
}
/****************************************************************************
* Name: stmpe11_tscworker
*
* Description:
* This function is called to handle a TSC interrupt. It is not really
* an interrupt handle because it is called from the STMPE11 "bottom half"
* logic that runs on the worker thread.
*
****************************************************************************/
void stmpe11_tscworker(FAR struct stmpe11_dev_s *priv, uint8_t intsta)
{
FAR struct stmpe11_config_s *config; /* Convenience pointer */
bool pendown; /* true: pend is down */
uint16_t xdiff; /* X difference used in thresholding */
uint16_t ydiff; /* Y difference used in thresholding */
uint16_t x; /* X position */
uint16_t y; /* Y position */
ASSERT(priv != NULL);
/* Get a pointer the callbacks for convenience (and so the code is not so
* ugly).
*/
config = priv->config;
DEBUGASSERT(config != NULL);
/* Check for pen up or down from the TSC_STA ibit n the STMPE11_TSC_CTRL register. */
pendown = (stmpe11_getreg8(priv, STMPE11_TSC_CTRL) & TSC_CTRL_TSC_STA) != 0;
/* Handle the change from pen down to pen up */
if (!pendown)
{
/* The pen is up.. reset thresholding variables. FIFOs will read zero if
* there is no data available (hence the choice of (0,0)
*/
priv->threshx = 0;
priv->threshy = 0;
/* Ignore the interrupt if the pen was already up (CONTACT_NONE == pen up and
* already reported; CONTACT_UP == pen up, but not reported)
*/
if (priv->sample.contact == CONTACT_NONE ||
priv->sample.contact == CONTACT_UP)
{
goto ignored;
}
/* A pen-down to up transition has been detected. CONTACT_UP indicates the
* initial loss of contzt. The state will be changed to CONTACT_NONE
* after the loss of contact is sampled.
*/
priv->sample.contact = CONTACT_UP;
}
/* The pen is down... check for data in the FIFO */
else if ((intsta & (INT_FIFO_TH|INT_FIFO_OFLOW)) != 0)
{
/* Read the next x and y positions from the FIFO. */
#ifdef CONFIG_STMPE11_SWAPXY
x = stmpe11_getreg16(priv, STMPE11_TSC_DATAX);
y = stmpe11_getreg16(priv, STMPE11_TSC_DATAY);
#else
x = stmpe11_getreg16(priv, STMPE11_TSC_DATAY);
y = stmpe11_getreg16(priv, STMPE11_TSC_DATAX);
#endif
/* If we have not yet processed the last pen up event, then we
* cannot handle this pen down event. We will have to discard it. That
* should be okay because there will be another FIFO event right behind
* this one. Other kinds of data overruns are not harmful.
*
* Hmm.. a better design might be to disable FIFO interrupts when we
* detect pen up. Then re-enable them when CONTACT_UP is reported.
* That would save processing interrupts just to discard the data.
*/
if (priv->sample.contact == CONTACT_UP)
{
/* We have not closed the loop on the last touch ... don't report
* anything.
*/
goto ignored;
}
/* Perform a thresholding operation so that the results will be more stable */
xdiff = x > priv->threshx ? (x - priv->threshx) : (priv->threshx - x);
ydiff = y > priv->threshy ? (y - priv->threshy) : (priv->threshy - y);
/* If the difference from the last sample is small, then ignore the event.
* REVISIT: Should a large change in pressure also generate a event?
*/
if (xdiff + ydiff < 6)
{
/* Little or no change in position ... don't report anything.
*/
goto ignored;
}
/* When we see a big difference, snap to the new x/y thresholds */
priv->threshx = x;
priv->threshy = y;
/* Update the x/y position in the sample data */
priv->sample.x = priv->threshx;
priv->sample.y = priv->threshy;
/* Update the Z pressure index */
priv->sample.z = stmpe11_getreg8(priv, STMPE11_TSC_DATAZ);
/* If this is the first (acknowledged) pen down report, then report
* this as the first contact. If contact == CONTACT_DOWN, it will be
* set to set to CONTACT_MOVE after the contact is first sampled.
*/
if (priv->sample.contact != CONTACT_MOVE)
{
/* First contact */
priv->sample.contact = CONTACT_DOWN;
}
}
/* Pen down, but no data in FIFO */
else
{
/* Ignore the interrupt... wait until there is data in the FIFO */
goto ignored;
}
/* We get here if (1) we just went from a pen down to a pen up state OR (2)
* We just get a measurement from the FIFO in a pen down state. Indicate
* the availability of new sample data for this ID.
*/
priv->sample.id = priv->id;
priv->penchange = true;
/* Notify any waiters that new STMPE11 data is available */
stmpe11_notify(priv);
/* Clear the interrupt pending bit and enable the FIFO again */
ignored:
stmpe11_putreg8(priv, STMPE11_FIFO_STA, 0x01);
stmpe11_putreg8(priv, STMPE11_FIFO_STA, 0x00);
}
#endif /* CONFIG_INPUT && CONFIG_INPUT_STMPE11 && !CONFIG_STMPE11_TSC_DISABLE */
|