-
Notifications
You must be signed in to change notification settings - Fork 314
/
Copy pathptt.c
1601 lines (1278 loc) · 44.4 KB
/
ptt.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
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
//
// This file is part of Dire Wolf, an amateur radio packet TNC.
//
// Copyright (C) 2011, 2013, 2014, 2015, 2016, 2017 John Langner, WB2OSZ
//
// 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 2 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/>.
/*------------------------------------------------------------------
*
* Module: ptt.c
*
* Purpose: Activate the output control lines for push to talk (PTT) and other purposes.
*
* Description: Traditionally this is done with the RTS signal of the serial port.
*
* If we have two radio channels and only one serial port, DTR
* can be used for the second channel.
*
* If __WIN32__ is defined, we use the Windows interface.
* Otherwise we use the Linux interface.
*
* Version 0.9: Add ability to use GPIO pins on Linux.
*
* Version 1.1: Add parallel printer port for x86 Linux only.
*
* This is hardcoded to use the primary motherboard parallel
* printer port at I/O address 0x378. This might work with
* a PCI card configured to use the same address if the
* motherboard does not have a built in parallel port.
* It won't work with a USB-to-parallel-printer-port adapter.
*
* Version 1.2: More than two radio channels.
* Generalize for additional signals besides PTT.
*
* Version 1.3: HAMLIB support.
*
* Version 1.4: The spare "future" indicator is now used when connected to another station.
*
* Take advantage of the new 'gpio' group and new /sys/class/gpio protections in Raspbian Jessie.
*
* Handle more complicated gpio node names for CubieBoard, etc.
*
* Version 1.5: Ability to use GPIO pins of CM108/CM119 for PTT signal.
*
*
* References: http://www.robbayer.com/files/serial-win.pdf
*
* https://www.kernel.org/doc/Documentation/gpio.txt
*
*---------------------------------------------------------------*/
/*
A growing number of people have been asking about support for the DMK URI,
RB-USB RIM, etc.
These use a C-Media CM108/CM119 with an interesting addition, a GPIO
pin is used to drive PTT. Here is some related information.
DMK URI:
http://www.dmkeng.com/URI_Order_Page.htm
http://dmkeng.com/images/URI%20Schematic.pdf
RB-USB RIM:
http://www.repeater-builder.com/products/usb-rim-lite.html
http://www.repeater-builder.com/voip/pdf/cm119-datasheet.pdf
RA-35:
http://www.masterscommunications.com/products/radio-adapter/ra35.html
DINAH:
https://hamprojects.info/dinah/
Homebrew versions of the same idea:
http://images.ohnosec.org/usbfob.pdf
http://www.qsl.net/kb9mwr/projects/voip/usbfob-119.pdf
http://rtpdir.weebly.com/uploads/1/6/8/7/1687703/usbfob.pdf
http://www.repeater-builder.com/projects/fob/USB-Fob-Construction.pdf
Applications that have support for this:
http://docs.allstarlink.org/drupal/
http://soundmodem.sourcearchive.com/documentation/0.16-1/ptt_8c_source.html
https://github.com/N0NB/hamlib/blob/master/src/cm108.c#L190
http://permalink.gmane.org/gmane.linux.hams.hamlib.devel/3420
Information about the "hidraw" device:
http://unix.stackexchange.com/questions/85379/dev-hidraw-read-permissions
http://www.signal11.us/oss/udev/
http://www.signal11.us/oss/hidapi/
https://github.com/signal11/hidapi/blob/master/libusb/hid.c
http://stackoverflow.com/questions/899008/howto-write-to-the-gpio-pin-of-the-cm108-chip-in-linux
https://www.kernel.org/doc/Documentation/hid/hidraw.txt
https://github.com/torvalds/linux/blob/master/samples/hidraw/hid-example.c
Similar chips: SSS1621, SSS1623
https://irongarment.wordpress.com/2011/03/29/cm108-compatible-chips-with-gpio/
Here is an attempt to add direct CM108 support.
Seems to be hardcoded for only a single USB audio adapter.
https://github.com/donothingloop/direwolf_cm108
In version 1.3, we add HAMLIB support which should be able to do this in a roundabout way.
(Linux only at this point.)
This is documented in the User Guide, section called,
"Hamlib PTT Example 2: Use GPIO of USB audio adapter. (e.g. DMK URI)"
It's rather involved and the explantion doesn't cover the case of multiple
USB-Audio adapters. It would be nice to have a little script which lists all
of the USB-Audio adapters and the corresponding /dev/hidraw device.
( We now have it. The included "cm108" application. )
In version 1.5 we have a flexible, easy to use implementation for Linux.
Windows would be a lot of extra work because USB devices are nothing like Linux.
We'd be starting from scratch to figure out how to do it.
*/
#include "direwolf.h" // should be first. This includes windows.h.
#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <assert.h>
#include <string.h>
#include <time.h>
#if __WIN32__
#else
#include <sys/termios.h>
#include <sys/ioctl.h>
#include <fcntl.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <errno.h>
#include <grp.h>
#include <dirent.h>
#ifdef USE_HAMLIB
#include <hamlib/rig.h>
#endif
#ifdef USE_CM108
#include "cm108.h"
#endif
/* So we can have more common code for fd. */
typedef int HANDLE;
#define INVALID_HANDLE_VALUE (-1)
#endif
#include "textcolor.h"
#include "audio.h"
#include "ptt.h"
#include "dlq.h"
#if __WIN32__
#define RTS_ON(fd) EscapeCommFunction(fd,SETRTS);
#define RTS_OFF(fd) EscapeCommFunction(fd,CLRRTS);
#define DTR_ON(fd) EscapeCommFunction(fd,SETDTR);
#define DTR_OFF(fd) EscapeCommFunction(fd,CLRDTR);
#else
#define RTS_ON(fd) { int stuff; ioctl (fd, TIOCMGET, &stuff); stuff |= TIOCM_RTS; ioctl (fd, TIOCMSET, &stuff); }
#define RTS_OFF(fd) { int stuff; ioctl (fd, TIOCMGET, &stuff); stuff &= ~TIOCM_RTS; ioctl (fd, TIOCMSET, &stuff); }
#define DTR_ON(fd) { int stuff; ioctl (fd, TIOCMGET, &stuff); stuff |= TIOCM_DTR; ioctl (fd, TIOCMSET, &stuff); }
#define DTR_OFF(fd) { int stuff; ioctl (fd, TIOCMGET, &stuff); stuff &= ~TIOCM_DTR; ioctl (fd, TIOCMSET, &stuff); }
#define LPT_IO_ADDR 0x378
#endif
static struct audio_s *save_audio_config_p; /* Save config information for later use. */
static int ptt_debug_level = 0;
void ptt_set_debug(int debug)
{
ptt_debug_level = debug;
}
/*-------------------------------------------------------------------
*
* Name: get_access_to_gpio
*
* Purpose: Try to get access to the GPIO device.
*
* Inputs: path - Path to device node.
* /sys/class/gpio/export
* /sys/class/gpio/unexport
* /sys/class/gpio/gpio??/direction
* /sys/class/gpio/gpio??/value
*
* Description: First see if we have access thru the usual uid/gid/mode method.
* If that fails, we try a hack where we use "sudo chmod ..." to open up access.
* That requires that sudo be configured to work without a password.
* That's the case for 'pi' user in Raspbian but not not be for other boards / operating systems.
*
* Debug: Use the "-doo" command line option.
*
*------------------------------------------------------------------*/
#ifndef __WIN32__
#define MAX_GROUPS 50
static void get_access_to_gpio (const char *path)
{
static int my_uid = -1;
static int my_gid = -1;
static gid_t my_groups[MAX_GROUPS];
static int num_groups = 0;
static int first_time = 1;
struct stat finfo;
int i;
char cmd[80];
int err;
/*
* Does path even exist?
*/
if (stat(path, &finfo) < 0) {
text_color_set(DW_COLOR_ERROR);
dw_printf ("Can't get properties of %s.\n", path);
dw_printf ("This system is not configured with the GPIO user interface.\n");
dw_printf ("Use a different method for PTT control.\n");
exit (1);
}
if (first_time) {
// No need to fetch same information each time. Cache it.
my_uid = geteuid();
my_gid = getegid();
num_groups = getgroups (MAX_GROUPS, my_groups);
if (num_groups < 0) {
text_color_set(DW_COLOR_ERROR);
dw_printf ("getgroups() failed to get supplementary groups, errno=%d\n", errno);
num_groups = 0;
}
first_time = 0;
}
if (ptt_debug_level >= 2) {
text_color_set(DW_COLOR_DEBUG);
dw_printf ("%s: uid=%d, gid=%d, mode=o%o\n", path, finfo.st_uid, finfo.st_gid, finfo.st_mode);
dw_printf ("my uid=%d, gid=%d, supplementary groups=", my_uid, my_gid);
for (i = 0; i < num_groups; i++) {
dw_printf (" %d", my_groups[i]);
}
dw_printf ("\n");
}
/*
* Do we have permission to access it?
*
* On Debian 7 (Wheezy) we see this:
*
* $ ls -l /sys/class/gpio/export
* --w------- 1 root root 4096 Feb 27 12:31 /sys/class/gpio/export
*
*
* Only root can write to it.
* Our work-around is change the protection so that everyone can write.
* This requires that the current user can use sudo without a password.
* This has been the case for the predefined "pi" user but can be a problem
* when people add new user names.
* Other operating systems could have different default configurations.
*
* A better solution is available in Debian 8 (Jessie). The group is now "gpio"
* so anyone in that group can now write to it.
*
* $ ls -l /sys/class/gpio/export
* -rwxrwx--- 1 root gpio 4096 Mar 4 21:12 /sys/class/gpio/export
*
*
* First see if we can access it by the usual file protection rules.
* If not, we will try the "sudo chmod go+rw ..." hack.
*
*/
/*
* Do I have access?
* We could just try to open for write but this gives us more debugging information.
*/
if ((my_uid == finfo.st_uid) && (finfo.st_mode & S_IWUSR)) { // user write 00200
if (ptt_debug_level >= 2) {
text_color_set(DW_COLOR_DEBUG);
dw_printf ("My uid matches and we have user write permission.\n");
}
return;
}
if ((my_gid == finfo.st_gid) && (finfo.st_mode & S_IWGRP)) { // group write 00020
if (ptt_debug_level >= 2) {
text_color_set(DW_COLOR_DEBUG);
dw_printf ("My primary gid matches and we have group write permission.\n");
}
return;
}
for (i = 0; i < num_groups; i++) {
if ((my_groups[i] == finfo.st_gid) && (finfo.st_mode & S_IWGRP)) { // group write 00020
if (ptt_debug_level >= 2) {
text_color_set(DW_COLOR_DEBUG);
dw_printf ("My supplemental group %d matches and we have group write permission.\n", my_groups[i]);
}
return;
}
}
if (finfo.st_mode & S_IWOTH) { // other write 00002
if (ptt_debug_level >= 2) {
text_color_set(DW_COLOR_DEBUG);
dw_printf ("We have other write permission.\n");
}
return;
}
/*
* We don't have permission.
* Try a hack which requires that the user be set up to use sudo without a password.
*/
if (ptt_debug_level >= 2) {
text_color_set(DW_COLOR_ERROR); // debug message but different color so it stands out.
dw_printf ("Trying 'sudo chmod go+rw %s' hack.\n", path);
}
snprintf (cmd, sizeof(cmd), "sudo chmod go+rw %s", path);
err = system (cmd);
(void)err; // suppress warning about not using result.
/*
* I don't trust status coming back from system() so we will check the mode again.
*/
if (stat(path, &finfo) < 0) {
/* Unexpected because we could do it before. */
text_color_set(DW_COLOR_ERROR);
dw_printf ("This system is not configured with the GPIO user interface.\n");
dw_printf ("Use a different method for PTT control.\n");
exit (1);
}
/* Did we succeed in changing the protection? */
if ( (finfo.st_mode & 0266) != 0266) {
text_color_set(DW_COLOR_ERROR);
dw_printf ("You don't have the necessary permission to access GPIO.\n");
dw_printf ("There are three different solutions: \n");
dw_printf (" 1. Run as root. (not recommended)\n");
dw_printf (" 2. If operating system has 'gpio' group, add your user id to it.\n");
dw_printf (" 3. Configure your user id for sudo without a password.\n");
dw_printf ("\n");
dw_printf ("Read the documentation and try -doo command line option for debugging details.\n");
exit (1);
}
}
#endif
/*-------------------------------------------------------------------
*
* Name: export_gpio
*
* Purpose: Tell the GPIO subsystem to export a GPIO line for
* us to use, and set the initial state of the GPIO.
*
* Inputs: ch - Radio Channel.
* ot - Output type.
* invert: - Is the GPIO active low?
* direction: - 0 for input, 1 for output
*
* Outputs: out_gpio_name - in the audio configuration structure.
* in_gpio_name
*
*------------------------------------------------------------------*/
#ifndef __WIN32__
void export_gpio(int ch, int ot, int invert, int direction)
{
HANDLE fd;
const char gpio_export_path[] = "/sys/class/gpio/export";
char gpio_direction_path[80];
char gpio_value_path[80];
char stemp[16];
int gpio_num;
char *gpio_name;
// Raspberry Pi was easy. GPIO 24 has the name gpio24.
// Others, such as the Cubieboard, take a little more effort.
// The name might be gpio24_ph11 meaning connector H, pin 11.
// When we "export" GPIO number, we will store the corresponding
// device name for future use when we want to access it.
if (direction) {
gpio_num = save_audio_config_p->achan[ch].octrl[ot].out_gpio_num;
gpio_name = save_audio_config_p->achan[ch].octrl[ot].out_gpio_name;
}
else {
gpio_num = save_audio_config_p->achan[ch].ictrl[ot].in_gpio_num;
gpio_name = save_audio_config_p->achan[ch].ictrl[ot].in_gpio_name;
}
get_access_to_gpio (gpio_export_path);
fd = open(gpio_export_path, O_WRONLY);
if (fd < 0) {
// Not expected. Above should have obtained permission or exited.
text_color_set(DW_COLOR_ERROR);
dw_printf ("Permissions do not allow access to GPIO.\n");
exit (1);
}
snprintf (stemp, sizeof(stemp), "%d", gpio_num);
if (write (fd, stemp, strlen(stemp)) != strlen(stemp)) {
int e = errno;
/* Ignore EBUSY error which seems to mean */
/* the device node already exists. */
if (e != EBUSY) {
text_color_set(DW_COLOR_ERROR);
dw_printf ("Error writing \"%s\" to %s, errno=%d\n", stemp, gpio_export_path, e);
dw_printf ("%s\n", strerror(e));
exit (1);
}
}
/* Wait for udev to adjust permissions after enabling GPIO. */
/* https://github.com/wb2osz/direwolf/issues/176 */
SLEEP_MS(250);
close (fd);
/*
* Added in release 1.4.
*
* On the RPi, the device path for GPIO number XX is simply /sys/class/gpio/gpioXX.
*
* There was a report that it is different for the CubieBoard. For instance
* GPIO 61 has gpio61_pi13 in the path. This indicates connector "i" pin 13.
* https://github.com/cubieplayer/Cubian/wiki/GPIO-Introduction
*
* For another similar single board computer, we find the same thing:
* https://www.olimex.com/wiki/A20-OLinuXino-LIME#GPIO_under_Linux
*
* How should we deal with this? Some possibilities:
*
* (1) The user might explicitly mention the name in direwolf.conf.
* (2) We might be able to find the names in some system device config file.
* (3) Get a directory listing of /sys/class/gpio then search for a
* matching name. Suppose we wanted GPIO 61. First look for an exact
* match to "gpio61". If that is not found, look for something
* matching the pattern "gpio61_*".
*
* We are finally implementing the third choice.
*/
struct dirent **file_list;
int num_files;
int i;
int ok = 0;
if (ptt_debug_level >= 2) {
text_color_set(DW_COLOR_DEBUG);
dw_printf ("Contents of /sys/class/gpio:\n");
}
num_files = scandir ("/sys/class/gpio", &file_list, NULL, alphasort);
if (num_files < 0) {
// Something went wrong. Fill in the simple expected name and keep going.
text_color_set(DW_COLOR_ERROR);
dw_printf ("ERROR! Could not get directory listing for /sys/class/gpio\n");
snprintf (gpio_name, MAX_GPIO_NAME_LEN, "gpio%d", gpio_num);
num_files = 0;
ok = 1;
}
else {
if (ptt_debug_level >= 2) {
text_color_set(DW_COLOR_DEBUG);
for (i = 0; i < num_files; i++) {
dw_printf("\t%s\n", file_list[i]->d_name);
}
}
// Look for exact name gpioNN
char lookfor[16];
snprintf (lookfor, sizeof(lookfor), "gpio%d", gpio_num);
for (i = 0; i < num_files && ! ok; i++) {
if (strcmp(lookfor, file_list[i]->d_name) == 0) {
strlcpy (gpio_name, file_list[i]->d_name, MAX_GPIO_NAME_LEN);
ok = 1;
}
}
// If not found, Look for gpioNN_*
snprintf (lookfor, sizeof(lookfor), "gpio%d_", gpio_num);
for (i = 0; i < num_files && ! ok; i++) {
if (strncmp(lookfor, file_list[i]->d_name, strlen(lookfor)) == 0) {
strlcpy (gpio_name, file_list[i]->d_name, MAX_GPIO_NAME_LEN);
ok = 1;
}
}
// Free the storage allocated by scandir().
for (i = 0; i < num_files; i++) {
free (file_list[i]);
}
free (file_list);
}
/*
* We should now have the corresponding node name.
*/
if (ok) {
if (ptt_debug_level >= 2) {
text_color_set(DW_COLOR_DEBUG);
dw_printf ("Path for gpio number %d is /sys/class/gpio/%s\n", gpio_num, gpio_name);
}
}
else {
text_color_set(DW_COLOR_ERROR);
dw_printf ("ERROR! Could not find Path for gpio number %d.n", gpio_num);
exit (1);
}
/*
* Set output direction and initial state
*/
snprintf (gpio_direction_path, sizeof(gpio_direction_path), "/sys/class/gpio/%s/direction", gpio_name);
get_access_to_gpio (gpio_direction_path);
fd = open(gpio_direction_path, O_WRONLY);
if (fd < 0) {
int e = errno;
text_color_set(DW_COLOR_ERROR);
dw_printf ("Error opening %s\n", stemp);
dw_printf ("%s\n", strerror(e));
exit (1);
}
char gpio_val[8];
if (direction) {
if (invert) {
strlcpy (gpio_val, "high", sizeof(gpio_val));
}
else {
strlcpy (gpio_val, "low", sizeof(gpio_val));
}
}
else {
strlcpy (gpio_val, "in", sizeof(gpio_val));
}
if (write (fd, gpio_val, strlen(gpio_val)) != strlen(gpio_val)) {
int e = errno;
text_color_set(DW_COLOR_ERROR);
dw_printf ("Error writing initial state to %s\n", stemp);
dw_printf ("%s\n", strerror(e));
exit (1);
}
close (fd);
/*
* Make sure that we have access to 'value'.
* Do it once here, rather than each time we want to use it.
*/
snprintf (gpio_value_path, sizeof(gpio_value_path), "/sys/class/gpio/%s/value", gpio_name);
get_access_to_gpio (gpio_value_path);
}
#endif /* not __WIN32__ */
/*-------------------------------------------------------------------
*
* Name: ptt_init
*
* Purpose: Open serial port(s) used for PTT signals and set to proper state.
*
* Inputs: audio_config_p - Structure with communication parameters.
*
* for each channel we have:
*
* ptt_method Method for PTT signal.
* PTT_METHOD_NONE - not configured. Could be using VOX.
* PTT_METHOD_SERIAL - serial (com) port.
* PTT_METHOD_GPIO - general purpose I/O.
* PTT_METHOD_LPT - Parallel printer port.
* PTT_METHOD_HAMLIB - HAMLib rig control.
* PTT_METHOD_CM108 - GPIO pins of CM108 etc. USB Audio.
*
* ptt_device Name of serial port device.
* e.g. COM1 or /dev/ttyS0.
* HAMLIB can also use hostaddr:port.
* Like /dev/hidraw1 for CM108.
*
* ptt_line RTS or DTR when using serial port.
*
* out_gpio_num GPIO number. Only used for Linux.
* Valid only when ptt_method is PTT_METHOD_GPIO.
*
* ptt_lpt_bit Bit number for parallel printer port.
* Bit 0 = pin 2, ..., bit 7 = pin 9.
* Valid only when ptt_method is PTT_METHOD_LPT.
*
* ptt_invert Invert the signal.
* Normally higher voltage means transmit or LED on.
*
* ptt_model Only for HAMLIB.
* 2 to communicate with rigctld.
* >= 3 for specific radio model.
* -1 guess at what is out there. (AUTO option in config file.)
*
* Outputs: Remember required information for future use.
*
* Description:
*
*--------------------------------------------------------------------*/
static HANDLE ptt_fd[MAX_CHANS][NUM_OCTYPES];
/* Serial port handle or fd. */
/* Could be the same for two channels */
/* if using both RTS and DTR. */
#if USE_HAMLIB
static RIG *rig[MAX_CHANS][NUM_OCTYPES];
#endif
static char otnames[NUM_OCTYPES][8];
void ptt_init (struct audio_s *audio_config_p)
{
int ch;
HANDLE fd = INVALID_HANDLE_VALUE;
#if __WIN32__
#else
int using_gpio;
#endif
#if DEBUG
text_color_set(DW_COLOR_DEBUG);
dw_printf ("ptt_init ( ... )\n");
#endif
save_audio_config_p = audio_config_p;
strlcpy (otnames[OCTYPE_PTT], "PTT", sizeof(otnames[OCTYPE_PTT]));
strlcpy (otnames[OCTYPE_DCD], "DCD", sizeof(otnames[OCTYPE_DCD]));
strlcpy (otnames[OCTYPE_CON], "CON", sizeof(otnames[OCTYPE_CON]));
for (ch = 0; ch < MAX_CHANS; ch++) {
int ot;
for (ot = 0; ot < NUM_OCTYPES; ot++) {
ptt_fd[ch][ot] = INVALID_HANDLE_VALUE;
#if USE_HAMLIB
rig[ch][ot] = NULL;
#endif
if (ptt_debug_level >= 2) {
text_color_set(DW_COLOR_DEBUG);
dw_printf ("ch=%d, %s method=%d, device=%s, line=%d, gpio=%d, lpt_bit=%d, invert=%d\n",
ch,
otnames[ot],
audio_config_p->achan[ch].octrl[ot].ptt_method,
audio_config_p->achan[ch].octrl[ot].ptt_device,
audio_config_p->achan[ch].octrl[ot].ptt_line,
audio_config_p->achan[ch].octrl[ot].out_gpio_num,
audio_config_p->achan[ch].octrl[ot].ptt_lpt_bit,
audio_config_p->achan[ch].octrl[ot].ptt_invert);
}
}
}
/*
* Set up serial ports.
*/
for (ch = 0; ch < MAX_CHANS; ch++) {
if (audio_config_p->achan[ch].medium == MEDIUM_RADIO) {
int ot;
for (ot = 0; ot < NUM_OCTYPES; ot++) {
if (audio_config_p->achan[ch].octrl[ot].ptt_method == PTT_METHOD_SERIAL) {
#if __WIN32__
#else
/* Translate Windows device name into Linux name. */
/* COM1 -> /dev/ttyS0, etc. */
if (strncasecmp(audio_config_p->achan[ch].octrl[ot].ptt_device, "COM", 3) == 0) {
int n = atoi (audio_config_p->achan[ch].octrl[ot].ptt_device + 3);
text_color_set(DW_COLOR_INFO);
dw_printf ("Converted %s device '%s'", audio_config_p->achan[ch].octrl[ot].ptt_device, otnames[ot]);
if (n < 1) n = 1;
snprintf (audio_config_p->achan[ch].octrl[ot].ptt_device, sizeof(audio_config_p->achan[ch].octrl[ot].ptt_device), "/dev/ttyS%d", n-1);
dw_printf (" to Linux equivalent '%s'\n", audio_config_p->achan[ch].octrl[ot].ptt_device);
}
#endif
/* Can't open the same device more than once so we */
/* need more logic to look for the case of multiple radio */
/* channels using different pins of the same COM port. */
/* Did some earlier channel use the same device name? */
int same_device_used = 0;
int j, k;
for (j = ch; j >= 0; j--) {
if (audio_config_p->achan[j].medium == MEDIUM_RADIO) {
for (k = ((j==ch) ? (ot - 1) : (NUM_OCTYPES-1)); k >= 0; k--) {
if (strcmp(audio_config_p->achan[ch].octrl[ot].ptt_device,audio_config_p->achan[j].octrl[k].ptt_device) == 0) {
fd = ptt_fd[j][k];
same_device_used = 1;
}
}
}
}
if ( ! same_device_used) {
#if __WIN32__
char bettername[50];
// Bug fix in release 1.1 - Need to munge name for COM10 and up.
// http://support.microsoft.com/kb/115831
strlcpy (bettername, audio_config_p->achan[ch].octrl[ot].ptt_device, sizeof(bettername));
if (strncasecmp(bettername, "COM", 3) == 0) {
int n;
n = atoi(bettername+3);
if (n >= 10) {
strlcpy (bettername, "\\\\.\\", sizeof(bettername));
strlcat (bettername, audio_config_p->achan[ch].octrl[ot].ptt_device, sizeof(bettername));
}
}
fd = CreateFile(bettername,
GENERIC_READ, 0, 0, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, 0);
#else
/* O_NONBLOCK added in version 0.9. */
/* Was hanging with some USB-serial adapters. */
/* https://bugs.launchpad.net/ubuntu/+source/linux/+bug/661321/comments/12 */
fd = open (audio_config_p->achan[ch].octrl[ot].ptt_device, O_RDONLY | O_NONBLOCK);
#endif
}
if (fd != INVALID_HANDLE_VALUE) {
ptt_fd[ch][ot] = fd;
}
else {
#if __WIN32__
#else
int e = errno;
#endif
text_color_set(DW_COLOR_ERROR);
dw_printf ("ERROR can't open device %s for channel %d PTT control.\n",
audio_config_p->achan[ch].octrl[ot].ptt_device, ch);
#if __WIN32__
#else
dw_printf ("%s\n", strerror(e));
#endif
/* Don't try using it later if device open failed. */
audio_config_p->achan[ch].octrl[ot].ptt_method = PTT_METHOD_NONE;
}
/*
* Set initial state off.
* ptt_set will invert output signal if appropriate.
*/
ptt_set (ot, ch, 0);
} /* if serial method. */
} /* for each output type. */
} /* if channel valid. */
} /* For each channel. */
/*
* Set up GPIO - for Linux only.
*/
#if __WIN32__
#else
/*
* Does any of them use GPIO?
*/
using_gpio = 0;
for (ch=0; ch<MAX_CHANS; ch++) {
if (save_audio_config_p->achan[ch].medium == MEDIUM_RADIO) {
int ot;
for (ot = 0; ot < NUM_OCTYPES; ot++) {
if (audio_config_p->achan[ch].octrl[ot].ptt_method == PTT_METHOD_GPIO) {
using_gpio = 1;
}
}
for (ot = 0; ot < NUM_ICTYPES; ot++) {
if (audio_config_p->achan[ch].ictrl[ot].method == PTT_METHOD_GPIO) {
using_gpio = 1;
}
}
}
}
if (using_gpio) {
get_access_to_gpio ("/sys/class/gpio/export");
}
/*
* We should now be able to create the device nodes for
* the pins we want to use.
*/
for (ch = 0; ch < MAX_CHANS; ch++) {
if (save_audio_config_p->achan[ch].medium == MEDIUM_RADIO) {
int ot; // output control type, PTT, DCD, CON, ...
int it; // input control type
for (ot = 0; ot < NUM_OCTYPES; ot++) {
if (audio_config_p->achan[ch].octrl[ot].ptt_method == PTT_METHOD_GPIO) {
export_gpio(ch, ot, audio_config_p->achan[ch].octrl[ot].ptt_invert, 1);
}
}
for (it = 0; it < NUM_ICTYPES; it++) {
if (audio_config_p->achan[ch].ictrl[it].method == PTT_METHOD_GPIO) {
export_gpio(ch, it, audio_config_p->achan[ch].ictrl[it].invert, 0);
}
}
}
}
#endif
/*
* Set up parallel printer port.
*
* Restrictions:
* Only the primary printer port.
* For x86 Linux only.
*/
#if ( defined(__i386__) || defined(__x86_64__) ) && ( defined(__linux__) || defined(__unix__) )
for (ch = 0; ch < MAX_CHANS; ch++) {
if (save_audio_config_p->achan[ch].medium == MEDIUM_RADIO) {
int ot;
for (ot = 0; ot < NUM_OCTYPES; ot++) {
if (audio_config_p->achan[ch].octrl[ot].ptt_method == PTT_METHOD_LPT) {
/* Can't open the same device more than once so we */
/* need more logic to look for the case of mutiple radio */
/* channels using different pins of the LPT port. */
/* Did some earlier channel use the same ptt device name? */
int same_device_used = 0;
int j, k;
for (j = ch; j >= 0; j--) {
if (audio_config_p->achan[j].medium == MEDIUM_RADIO) {
for (k = ((j==ch) ? (ot - 1) : (NUM_OCTYPES-1)); k >= 0; k--) {
if (strcmp(audio_config_p->achan[ch].octrl[ot].ptt_device,audio_config_p->achan[j].octrl[k].ptt_device) == 0) {
fd = ptt_fd[j][k];
same_device_used = 1;
}
}
}
}
if ( ! same_device_used) {
fd = open ("/dev/port", O_RDWR | O_NDELAY);
}
if (fd != INVALID_HANDLE_VALUE) {
ptt_fd[ch][ot] = fd;
}
else {
int e = errno;
text_color_set(DW_COLOR_ERROR);
dw_printf ("ERROR - Can't open /dev/port for parallel printer port PTT control.\n");
dw_printf ("%s\n", strerror(e));
dw_printf ("You probably don't have adequate permissions to access I/O ports.\n");
dw_printf ("Either run direwolf as root or change these permissions:\n");
dw_printf (" sudo chmod go+rw /dev/port\n");
dw_printf (" sudo setcap cap_sys_rawio=ep `which direwolf`\n");
/* Don't try using it later if device open failed. */
audio_config_p->achan[ch].octrl[ot].ptt_method = PTT_METHOD_NONE;
}
/*
* Set initial state off.
* ptt_set will invert output signal if appropriate.
*/
ptt_set (ot, ch, 0);
} /* if parallel printer port method. */
} /* for each output type */
} /* if valid channel. */
} /* For each channel. */
#endif /* x86 Linux */
#ifdef USE_HAMLIB
for (ch = 0; ch < MAX_CHANS; ch++) {
if (save_audio_config_p->achan[ch].medium == MEDIUM_RADIO) {
int ot;
for (ot = 0; ot < NUM_OCTYPES; ot++) {
if (audio_config_p->achan[ch].octrl[ot].ptt_method == PTT_METHOD_HAMLIB) {
if (ot == OCTYPE_PTT) {
/* For "AUTO" model, try to guess what is out there. */
if (audio_config_p->achan[ch].octrl[ot].ptt_model == -1) {
hamlib_port_t hport;
memset (&hport, 0, sizeof(hport));
strlcpy (hport.pathname, audio_config_p->achan[ch].octrl[ot].ptt_device, sizeof(hport.pathname));
rig_load_all_backends();
audio_config_p->achan[ch].octrl[ot].ptt_model = rig_probe(&hport);
if (audio_config_p->achan[ch].octrl[ot].ptt_model == RIG_MODEL_NONE) {
text_color_set(DW_COLOR_ERROR);
dw_printf ("Hamlib Error: Couldn't guess rig model number for AUTO option. Run \"rigctl --list\" for a list of model numbers.\n");
continue;
}
text_color_set(DW_COLOR_INFO);