-
Notifications
You must be signed in to change notification settings - Fork 49
/
Copy pathrx888.c
1245 lines (1125 loc) · 42.3 KB
/
rx888.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
// linked-in module for rx888 Mk ii for ka9q-radio's radiod
// Accept control commands from UDP socket
//
// Copyright (c) 2021 Ruslan Migirov <[email protected]>
// Credit: https://github.com/rhgndf/rx888_stream
// Copyright (c) 2023 Franco Venturi K4VZ
// Copyright (c) 2023 Phil Karn KA9Q
// VHF tuner support by K4VZ July 2024
// Note: VHF tuner does not work yet -- KA9Q, 17 Aug 2024
#define _GNU_SOURCE 1
#include <assert.h>
#include <pthread.h>
#include <libusb-1.0/libusb.h>
#include <iniparser/iniparser.h>
#if defined(linux)
#include <bsd/string.h>
#endif
#include <sysexits.h>
#include <unistd.h>
#include <strings.h>
#include "misc.h"
#include "status.h"
#include "config.h"
#include "radio.h"
#include "rx888.h"
#include "ezusb.h"
#define INPUT_PRIORITY 95
static int const Min_samprate = 1000000; // 1 MHz, in ltc2208 spec
static int const Max_samprate = 130000000; // 130 MHz, in ltc2208 spec
static int const Default_samprate = 64800000; // Synthesizes cleanly from 27 MHz reference
static float const Nyquist = 0.47; // Upper end of usable bandwidth, relative to 1/2 sample rate
static float const AGC_upper_limit = -15.0; // Reduce RF gain if A/D level exceeds this in dBFS
static float const AGC_lower_limit = -22.0; // Increase RF gain if level is below this in dBFS
static int const AGC_interval = 10; // Seconds between runs of AGC loop
static float const Start_gain = 10.0; // Initial VGA gain, dB
static float Power_smooth; // Arbitrary exponential smoothing factor for front end power estimate
// Reference frequency for Si5351 clock generator
static double const Min_reference = 10e6; // 10 MHz
static double const Max_reference = 100e6; // 100 MHz
static double const Default_reference = 27e6;
// Max allowable error on reference; 1e-4 = 100 ppm. Mainly to catch entry scaling errors
static double const Max_calibrate = 1e-4;
#if 0
// Min and Max frequency for VHF/UHF tuner
static double const Min_frequency = 50e6; // 50 MHz ?
static double const Max_frequency = 2000e6; // 2000 MHz
static uint32_t const R828D_FREQ = 16000000; // R820T reference frequency
static double const R828D_IF_CARRIER = 4570000;
#endif
int Ezusb_verbose = 0; // Used by ezusb.c
// Global variables set by config file options in main.c
extern int Verbose;
extern volatile bool Stop_transfers; // Flag to stop receive thread upcalls
// Hardware-specific stuff.
// Anything generic should be moved to 'struct frontend' under sdr in radio.h
struct sdrstate {
struct frontend *frontend; // Avoid references to external globals
// USB stuff
struct libusb_device_handle *dev_handle;
uint64_t serial; // Device serial number
struct libusb_config_descriptor *config;
unsigned int pktsize;
unsigned int transfer_size; // Size of data transfers performed so far (unused)
unsigned int transfer_index; // Write index into the transfer_size array (unused)
struct libusb_transfer **transfers; // List of transfer structures.
unsigned char **databuffers; // List of data buffers.
long long last_callback_time;
// USB transfer
int xfers_in_progress;
unsigned int queuedepth; // Number of requests to queue
unsigned int reqsize; // Request size in number of packets
unsigned long success_count; // Number of successful transfers
unsigned long failure_count; // Number of failed transfers
// RF Hardware
double reference;
bool randomizer;
bool dither;
uint32_t gpios;
uint64_t last_sample_count; // Used to verify sample rate
int64_t last_count_time;
bool message_posted; // Clock rate error posted last time around
float scale; // Scale samples for #bits and front end gain
int undersample; // Use undersample aliasing on baseband input for VHF/UHF. n = 1 => no undersampling
pthread_t cmd_thread;
pthread_t proc_thread;
pthread_t agc_thread;
};
static void rx_callback(struct libusb_transfer *transfer);
static int rx888_usb_init(struct sdrstate *sdr,const char *firmware,unsigned int queuedepth,unsigned int reqsize);
static void rx888_set_dither_and_randomizer(struct sdrstate *sdr,bool dither,bool randomizer);
static void rx888_set_att(struct sdrstate *sdr,float att,bool vhf);
static void rx888_set_gain(struct sdrstate *sdr,float gain,bool vhf);
static double rx888_set_samprate(struct sdrstate *sdr,double reference,unsigned int samprate);
static void rx888_set_hf_mode(struct sdrstate *sdr);
#if 0
static double rx888_set_tuner_frequency(struct sdrstate *sdr,double frequency);
#endif
static int rx888_start_rx(struct sdrstate *sdr,libusb_transfer_cb_fn callback);
static void rx888_stop_rx(struct sdrstate *sdr);
static void rx888_close(struct sdrstate *sdr);
static void free_transfer_buffers(unsigned char **databuffers,struct libusb_transfer **transfers,unsigned int queuedepth);
static double val2gain(int g);
static int gain2val(double gain);
static void *proc_rx888(void *arg);
static void *agc_rx888(void *arg);
#if 0
static double actual_freq(double frequency);
#endif
static void rational_approximation(double value, uint32_t max_denominator, uint32_t *a, uint32_t *b, uint32_t *c);
#define N_USB_SPEEDS 6
static char const *usb_speeds[N_USB_SPEEDS] = {
"unknown",
"Low (1.5 Mb/s)",
"Full (12 Mb/s)",
"High (480 Mb/s)",
"Super (5 Gb/s)",
"Super+ (10Gb/s)"
};
static char const *Rx888_keys[] = {
"library",
"device",
"firmware",
"serial",
"queuedepth",
"reqsize",
"dither",
"rand",
"gaincal",
"att",
"atten",
"featten",
"rfatten",
"gainmode",
"gain",
"rxgain",
"fegain",
"reference",
"calibrate",
"samprate",
"undersample",
"description",
"frequency",
NULL
};
int rx888_setup(struct frontend * const frontend,dictionary const * const dictionary,char const * const section){
assert(dictionary != NULL);
// Hardware-dependent setup
{
char const *device = config_getstring(dictionary,section,"device",section);
if(strcasecmp(device,"rx888") != 0)
return -1; // Not for us
}
config_validate_section(stdout,dictionary,section,Rx888_keys,NULL);
struct sdrstate * const sdr = calloc(1,sizeof(struct sdrstate));
assert(sdr != NULL);
// Cross-link generic and hardware-specific control structures
sdr->frontend = frontend;
frontend->context = sdr;
frontend->isreal = true; // Make sure the right kind of filter gets created!
frontend->bitspersample = 16; // For gain scaling
frontend->rf_agc = true; // On by default unless gain or atten is specified
{
char const *p = config_getstring(dictionary,section,"serial",NULL); // is serial specified?
if(p != NULL){
sdr->serial = strtoll(p,NULL,16);
}
}
// Firmware file
char const *firmware = config_getstring(dictionary,section,"firmware","SDDC_FX3.img");
// Queue depth, default 16; 32 sometimes overflows
int queuedepth = config_getint(dictionary,section,"queuedepth",16);
if(queuedepth < 1 || queuedepth > 64) {
fprintf(stdout,"Invalid queue depth %d, using 16\n",queuedepth);
queuedepth = 16;
}
// Packets per transfer request, default 32
int reqsize = config_getint(dictionary,section,"reqsize",32);
if(reqsize < 1 || reqsize > 64) {
fprintf(stdout,"Invalid request size %d, using 32\n",reqsize);
reqsize = 32;
}
{
int ret;
if((ret = rx888_usb_init(sdr,firmware,queuedepth,reqsize)) != 0){
fprintf(stdout,"rx888_usb_init() failed\n");
return -1;
}
}
// GPIOs
sdr->gpios = 0;
// Enable/disable dithering
sdr->dither = config_getboolean(dictionary,section,"dither",false);
// Enable/output output randomization
sdr->randomizer = config_getboolean(dictionary,section,"rand",false);
rx888_set_dither_and_randomizer(sdr,sdr->dither,sdr->randomizer);
// RF Gain calibration
// WA2ZKD measured several rx888s with very consistent results
// e.g., -90 dBm gives -91.4 dBFS with 0 dB VGA gain and 0 dB attenuation
// If you use a preamp or converter, add its gain to gaincal
frontend->rf_level_cal = config_getfloat(dictionary,section,"gaincal",-1.4);
// Attenuation, default 0
float att = fabsf(config_getfloat(dictionary,section,"att",9999));
att = fabsf(config_getfloat(dictionary,section,"atten",att));
att = fabsf(config_getfloat(dictionary,section,"featten",att));
att = fabsf(config_getfloat(dictionary,section,"rfatten",att));
if(att == 9999){
att = 0; // AGC still on, default attenuation 0 dB (not very useful anyway)
} else {
// Explicitly specified, turn off AGC
if(att > 31.5)
att = 31.5;
frontend->rf_agc = false;
}
rx888_set_att(sdr,att,false);
// Gain Mode now automatically set by gain; gain < 0 dB -> low, gain >= 0 dB -> high
char const *gainmode = config_getstring(dictionary,section,"gainmode",NULL);
if(gainmode != NULL)
fprintf(stdout,"gainmode parameter is obsolete, now set automatically\n");
// Gain value
float gain = config_getfloat(dictionary,section,"gain",9999);
gain = config_getfloat(dictionary,section,"rxgain",gain);
gain = config_getfloat(dictionary,section,"fegain",gain);
if(gain == 9999){
gain = Start_gain; // Default
} else {
// Explicitly specifed, turn off AGC
// should there be limits?
frontend->rf_agc = false;
}
rx888_set_gain(sdr,gain,false);
double reference = Default_reference;
{
char const *p = config_getstring(dictionary,section,"reference",NULL);
if(p != NULL)
reference = parse_frequency(p,false);
}
if(reference < Min_reference || reference > Max_reference){
fprintf(stdout,"Invalid reference frequency %'lf, forcing %'lf\n",reference,Default_reference);
reference = Default_reference;
}
double calibrate = config_getdouble(dictionary,section,"calibrate",0);
if(fabsl(calibrate) >= Max_calibrate){
fprintf(stdout,"Unreasonable frequency calibration %.3g, setting to 0\n",calibrate);
calibrate = 0;
}
int samprate = Default_samprate;
{
char const *p = config_getstring(dictionary,section,"samprate",NULL);
if(p != NULL)
samprate = parse_frequency(p,false);
}
if(samprate < Min_samprate){
fprintf(stdout,"Invalid sample rate %'d, forcing %'d\n",samprate,Min_samprate);
samprate = Min_samprate;
}
if(samprate > Max_samprate){
fprintf(stdout,"Invalid sample rate %'d, forcing %'d\n",samprate,Max_samprate);
samprate = Max_samprate;
}
sdr->reference = reference * (1 + calibrate);
usleep(5000);
double actual = rx888_set_samprate(sdr,sdr->reference,samprate);
frontend->samprate = samprate;
sdr->undersample = config_getint(dictionary,section,"undersample",1);
if(sdr->undersample < 1){
fprintf(stdout,"rx888 undersample must be >= 1, ignoring\n");
sdr->undersample = 1;
}
int mult = sdr->undersample / 2;
frontend->frequency = frontend->samprate * mult;
if(sdr->undersample & 1){
// Somewhat arbitrary. See https://ka7oei.blogspot.com/2024/12/frequency-response-of-rx-888-sdr-at.html
frontend->min_IF = 15000;
frontend->max_IF = Nyquist * samprate;
} else {
frontend->min_IF = -Nyquist * samprate;
frontend->max_IF = -15000;
}
// start clock
control_send_byte(sdr->dev_handle,I2CWFX3,SI5351_ADDR,SI5351_REGISTER_PLL_RESET,SI5351_VALUE_PLLA_RESET);
// power on clock 0
// uint8_t const clock_control = SI5351_VALUE_MS_INT | SI5351_VALUE_CLK_SRC_MS | SI5351_VALUE_CLK_DRV_8MA | SI5351_VALUE_MS_SRC_PLLA;
uint8_t const clock_control = SI5351_VALUE_CLK_SRC_MS | SI5351_VALUE_CLK_DRV_8MA | SI5351_VALUE_MS_SRC_PLLA;
control_send_byte(sdr->dev_handle,I2CWFX3,SI5351_ADDR,SI5351_REGISTER_CLK_BASE+0,clock_control);
{
char const *p = config_getstring(dictionary,section,"description","rx888");
if(p != NULL)
strlcpy(frontend->description,p,sizeof(frontend->description));
}
double ferror = actual - samprate;
float xfer_time = (float)(sdr->reqsize * sdr->pktsize) / (sizeof(int16_t) * frontend->samprate);
// Compute exponential smoothing constant
// value is 1 - exp(-blocktime/tc), but use expm1() function to save precision
float const tc = 1.0; // 1 second
Power_smooth = -expm1f(-xfer_time/tc);
fprintf(stdout,"rx888 reference %'.1lf Hz, nominal sample rate %'d Hz, actual %'.3lf Hz (synth err %.3lf Hz; %.3lf ppm), AGC %s, nominal gain %.1f dB, actual gain %.1f dB, atten %.1f dB, gain cal %.1f dB, dither %d, randomizer %d, USB queue depth %d, USB request size %'d * pktsize %'d = %'d bytes (%g sec)\n",
sdr->reference,samprate,actual,ferror, 1e6 * ferror / samprate,
frontend->rf_agc ? "on" : "off",
gain,frontend->rf_gain,frontend->rf_atten,frontend->rf_level_cal,
sdr->dither,sdr->randomizer,sdr->queuedepth,sdr->reqsize,sdr->pktsize,sdr->reqsize * sdr->pktsize,
xfer_time);
#if 0
// VHF-UHF tuning
{
char const *p = config_getstring(dictionary,section,"frequency",NULL);
if(p != NULL){
if(sdr->undersample > 1){
fprintf(stdout,"frequency = ignored in undersample mode\n");
} else {
double frequency = parse_frequency(p,false);
if(frequency < Min_frequency || frequency > Max_frequency){
fprintf(stdout,"Invalid VHF/UHF frequency %'lf, ignoring\n",frequency);
} else {
// VHF/UHF mode
double actual_frequency = rx888_set_tuner_frequency(sdr,frequency);
fprintf(stdout,"Actual VHF/UHF tuner frequency %'lf\n",actual_frequency);
frontend->frequency = actual_frequency;
rx888_set_att(sdr,att,true);
rx888_set_gain(sdr,gain,true);
frontend->lock = true;
}
}
}
}
#else
frontend->frequency = 0;
#endif
if(frontend->frequency == 0)
rx888_set_hf_mode(sdr);
usleep(1000000); // 1s - see SDDC_FX3 firmware
return 0;
}
// Come back here after common stuff has been set up (filters, etc)
int rx888_startup(struct frontend * const frontend){
struct sdrstate * const sdr = (struct sdrstate *)frontend->context;
// Start processing A/D data
sdr->scale = scale_AD(frontend); // set scaling now that we know the forward FFT size
pthread_create(&sdr->proc_thread,NULL,proc_rx888,sdr);
pthread_create(&sdr->agc_thread,NULL,agc_rx888,sdr);
fprintf(stdout,"rx888 running\n");
return 0;
}
// command to set analog gain. Turn off AGC if it was on
float rx888_gain(struct frontend * const frontend, float gain){
struct sdrstate * const sdr = (struct sdrstate *)frontend->context;
if(frontend->rf_agc)
fprintf(stdout,"manual gain setting, turning off AGC\n");
frontend->rf_agc = false;
rx888_set_gain(sdr,gain,sdr->undersample == 1 && frontend->frequency != 0);
return frontend->rf_gain;
}
// command to set analog attenuation. Turn off AGC if it was on
float rx888_atten(struct frontend * const frontend, float atten){
struct sdrstate * const sdr = (struct sdrstate *)frontend->context;
if(frontend->rf_agc)
fprintf(stdout,"manual atten setting, turning off AGC\n");
frontend->rf_agc = false;
rx888_set_att(sdr,atten,sdr->undersample == 1 && frontend->frequency != 0);
return frontend->rf_atten;
}
// Process incoming A/D samples
static void *proc_rx888(void *arg){
struct sdrstate * const sdr = (struct sdrstate *)arg;
assert(sdr != NULL);
pthread_setname("proc_rx888");
realtime(INPUT_PRIORITY);
{
int64_t const now = gps_time_ns();
sdr->last_callback_time = now;
sdr->last_count_time = now;
int ret __attribute__ ((unused));
ret = rx888_start_rx(sdr,rx_callback);
assert(ret == 0);
}
do {
// If the USB cable is pulled, libusb_handle_events() simply hangs
// so use libusb_handle_events_timeout_completed() instead
// Unfortunately it doesn't give any indication that it has timed out
// so we check more directly how long it's been since we last got data
// sdr->last_callback_time is set in rx_callback()
int const maxtime = 5;
if(gps_time_ns() > sdr->last_callback_time + maxtime * BILLION){
Stop_transfers = true;
fprintf(stderr,"No rx888 data for %d seconds, quitting\n",maxtime);
break;
}
struct timeval tv;
tv.tv_sec = 1;
tv.tv_usec = 0;
int const ret = libusb_handle_events_timeout_completed(NULL,&tv,NULL);
if(ret != 0){
// Apparent failure
fprintf(stderr,"handle_events returned %d\n",ret);
Stop_transfers = true;
}
} while (!Stop_transfers);
rx888_stop_rx(sdr);
rx888_close(sdr);
// Can't do anything without the front end; quit entirely
fprintf(stdout,"rx888 has aborted, exiting radiod\n");
exit(EX_NOINPUT);
}
// Monitor power levels, record new watermarks, adjust AGC if enabled
// Also perform coarse check on sample rate, compared to system clock
static void *agc_rx888(void *arg){
struct sdrstate * const sdr = (struct sdrstate *)arg;
assert(sdr != NULL);
pthread_setname("agc_rx888");
struct frontend *frontend = sdr->frontend;
while(1){
sleep(AGC_interval);
int64_t now = gps_time_ns();
if(now >= sdr->last_count_time + 60 * BILLION){
// Verify approximate sample rate once per minute
int64_t const sampcount = frontend->samples - sdr->last_sample_count;
double const rate = BILLION * (double)sampcount / (now - sdr->last_count_time);
double const error = fabs((rate - frontend->samprate) / (double)frontend->samprate);
if(error > 0.01 || sdr->message_posted){
// Post message every time the clock is off by 1% or more, or if it has just returned to nominal
fprintf(stdout,"RX888 measured sample rate error: %'.1lf Hz vs nominal %'d Hz\n",
rate,frontend->samprate);
sdr->message_posted = (error > 0.01);
}
}
float scaled_new_power = frontend->if_power * scale_ADpower2FS(frontend);
float new_dBFS = power2dB(scaled_new_power);
if(frontend->if_power > frontend->if_power_max){
if(Verbose){
// Don't print a message unless the increase is > 0.1 dB, the precision of the printf
float scaled_old_power = frontend->if_power_max * scale_ADpower2FS(frontend);
float old_dBFS = power2dB(scaled_old_power);
if(new_dBFS >= old_dBFS + 0.1)
fprintf(stdout,"New input power high watermark: %.1f dBFS\n",new_dBFS);
}
frontend->if_power_max = frontend->if_power;
}
if(frontend->rf_agc && (new_dBFS > AGC_upper_limit || new_dBFS < AGC_lower_limit)){
float const target_level = (AGC_upper_limit + AGC_lower_limit)/2;
float new_gain = frontend->rf_gain - (new_dBFS - target_level);
if(new_gain > 34)
new_gain = 34;
if(new_gain != frontend->rf_gain){
if(Verbose)
fprintf(stdout,"Front end gain change from %.1f dB to %.1f dB\n",frontend->rf_gain,new_gain);
rx888_set_gain(sdr,new_gain,false);
// Change averaged value to speed convergence
frontend->if_power *= dB2power(target_level - new_dBFS);
// Unlatch high water mark
frontend->if_power_max = 0;
}
}
}
return NULL;
}
// Callback called with incoming receiver data from A/D
static void rx_callback(struct libusb_transfer * const transfer){
assert(transfer != NULL);
struct sdrstate * const sdr = (struct sdrstate *)transfer->user_data;
struct frontend * const frontend = sdr->frontend;
int64_t const now = gps_time_ns();
sdr->xfers_in_progress--;
sdr->last_callback_time = now;
if(transfer->status != LIBUSB_TRANSFER_COMPLETED) {
sdr->failure_count++;
if(Verbose > 1)
fprintf(stdout,"Transfer %p callback status %s received %d bytes.\n",transfer,
libusb_error_name(transfer->status), transfer->actual_length);
if(!Stop_transfers) {
if(libusb_submit_transfer(transfer) == 0)
sdr->xfers_in_progress++;
}
return;
}
// successful USB transfer
int const size = transfer->actual_length;
sdr->success_count++;
// Feed directly into FFT input buffer, accumulate energy
float in_energy = 0; // A/D energy accumulator
int16_t const * const samples = (int16_t *)transfer->buffer;
float * const wptr = frontend->in.input_write_pointer.r;
int const sampcount = size / sizeof(int16_t);
if(sdr->randomizer){
for(int i=0; i < sampcount; i++){
int32_t s = samples[i];
s ^= (s << 31) >> 30; // Put LSB in sign bit, then shift back by one less bit to make ..ffffe or 0
if(s == 32767 || s <= -32767){
frontend->overranges++;
frontend->samp_since_over = 0;
} else {
frontend->samp_since_over++;
}
in_energy += s * s;
wptr[i] = s * sdr->scale;
}
} else {
for(int i=0; i < sampcount; i++){
if(samples[i] == 32767 || samples[i] <= -32767){
frontend->overranges++;
frontend->samp_since_over = 0;
} else {
frontend->samp_since_over++;
}
in_energy += (int)samples[i] * samples[i];
wptr[i] = sdr->scale * samples[i];
}
}
frontend->timestamp = now;
// These blocks are kinda small, so exponentially smooth the power readings
frontend->if_power += Power_smooth * (in_energy / sampcount - frontend->if_power);
frontend->samples += sampcount; // Count original samples
if(!Stop_transfers) {
if(libusb_submit_transfer(transfer) == 0)
sdr->xfers_in_progress++;
}
write_rfilter(&frontend->in,NULL,sampcount); // Update write pointer, invoke FFT if block is complete
}
static int rx888_usb_init(struct sdrstate *const sdr,const char * const firmware,unsigned int const queuedepth,unsigned int const reqsize){
if(firmware == NULL){
fprintf(stdout,"Firmware not loaded and not available\n");
return -1;
}
char full_firmware_file[PATH_MAX];
memset(full_firmware_file,0,sizeof(full_firmware_file));
dist_path(full_firmware_file,sizeof(full_firmware_file),firmware);
{
int ret = libusb_init(NULL);
if(ret != 0){
fprintf(stdout,"Error initializing libusb: %s\n",
libusb_error_name(ret));
return -1;
}
}
uint16_t const vendor_id = 0x04b4;
uint16_t const unloaded_product_id = 0x00f3;
uint16_t const loaded_product_id = 0x00f1;
if(sdr->serial != 0)
fprintf(stdout,"Looking for rx888 serial %016llx\n",(long long)sdr->serial);
// Search for unloaded rx888s (0x04b4:0x00f3) with the desired serial, or all such devices if no serial specified
// and load with firmware
libusb_device **device_list;
int dev_count = libusb_get_device_list(NULL,&device_list);
for(int i=0; i < dev_count; i++){
libusb_device *device = device_list[i];
if(device == NULL)
break; // End of list
struct libusb_device_descriptor desc = {0};
int rc = libusb_get_device_descriptor(device,&desc);
if(rc != 0){
fprintf(stdout," libusb_get_device_descriptor() failed: %s\n",libusb_strerror(rc));
continue;
}
if(desc.idVendor != vendor_id || desc.idProduct != unloaded_product_id)
continue;
fprintf(stdout,"found rx888 vendor %04x, device %04x",desc.idVendor,desc.idProduct);
libusb_device_handle *handle = NULL;
rc = libusb_open(device,&handle);
if(rc != 0 || handle == NULL){
fprintf(stdout,", libusb_open() failed: %s\n",libusb_strerror(rc));
continue;
}
if(desc.iManufacturer){
char manufacturer[100];
memset(manufacturer,0,sizeof(manufacturer));
int ret = libusb_get_string_descriptor_ascii(handle,desc.iManufacturer,(unsigned char *)manufacturer,sizeof(manufacturer));
if(ret > 0)
fprintf(stdout,", manufacturer '%s'",manufacturer);
}
if(desc.iProduct){
char product[100];
memset(product,0,sizeof(product));
int ret = libusb_get_string_descriptor_ascii(handle,desc.iProduct,(unsigned char *)product,sizeof(product));
if(ret > 0)
fprintf(stdout,", product '%s'",product);
}
char serial[100];
memset(serial,0,sizeof(serial));
if(desc.iSerialNumber){
int ret = libusb_get_string_descriptor_ascii(handle,desc.iSerialNumber,(unsigned char *)serial,sizeof(serial));
if(ret > 0){
fprintf(stdout,", serial '%s'",serial);
}
}
// The proper serial number doesn't appear until the device is loaded with firmware, so load all we find
fprintf(stdout,", loading rx888 firmware file %s",full_firmware_file);
if(ezusb_load_ram(handle,full_firmware_file,FX_TYPE_FX3,IMG_TYPE_IMG,1) == 0){
fprintf(stdout,", done\n");
sleep(1); // how long should this be?
} else {
fprintf(stdout,", failed for device %d.%d (logical)\n",
libusb_get_bus_number(device),libusb_get_device_address(device));
}
libusb_close(handle);
handle = NULL;
}
libusb_free_device_list(device_list,1);
device_list = NULL;
// Scan list again, looking for a loaded device
libusb_device *device = NULL;
dev_count = libusb_get_device_list(NULL,&device_list);
for(int i=0; i < dev_count; i++){
device = device_list[i];
if(device == NULL)
break; // End of list
struct libusb_device_descriptor desc = {0};
int rc = libusb_get_device_descriptor(device,&desc);
if(rc != 0){
fprintf(stdout," libusb_get_device_descriptor() failed: %s\n",libusb_strerror(rc));
continue;
}
if(desc.idVendor != vendor_id || desc.idProduct != loaded_product_id)
continue;
fprintf(stdout,"found rx888 vendor %04x, device %04x",desc.idVendor,desc.idProduct);
libusb_device_handle *handle = NULL;
rc = libusb_open(device,&handle);
if(rc != 0 || handle == NULL){
fprintf(stdout," libusb_open() failed: %s\n",libusb_strerror(rc));
continue;
}
if(desc.iManufacturer){
char manufacturer[100];
memset(manufacturer,0,sizeof(manufacturer));
int ret = libusb_get_string_descriptor_ascii(handle,desc.iManufacturer,(unsigned char *)manufacturer,sizeof(manufacturer));
if(ret > 0)
fprintf(stdout,", manufacturer '%s'",manufacturer);
}
if(desc.iProduct){
char product[100];
memset(product,0,sizeof(product));
int ret = libusb_get_string_descriptor_ascii(handle,desc.iProduct,(unsigned char *)product,sizeof(product));
if(ret > 0)
fprintf(stdout,", product '%s'",product);
}
char serial[100];
memset(serial,0,sizeof(serial));
if(desc.iSerialNumber){
int ret = libusb_get_string_descriptor_ascii(handle,desc.iSerialNumber,(unsigned char *)serial,sizeof(serial));
if(ret > 0){
fprintf(stdout,", serial '%s'",serial);
}
}
// Is this the droid we're looking for?
uint64_t serialnum = strtoll(serial,NULL,16);
if(sdr->serial == 0 || sdr->serial == serialnum){
// Either the user didn't specify a serial, or this is the one he did; use it
fprintf(stdout,", selected\n");
sdr->dev_handle = handle;
break;
}
fprintf(stdout,"\n"); // Not selected; close and keep looking
libusb_close(handle);
handle = NULL;
}
libusb_free_device_list(device_list,1);
device_list = NULL;
// If a device has been found, device and dev_handle will be non-NULL
if(device == NULL || sdr->dev_handle == NULL){
fprintf(stdout,"Error or device could not be found\n");
goto end;
}
enum libusb_speed usb_speed = libusb_get_device_speed(device);
if(usb_speed < N_USB_SPEEDS)
fprintf(stdout,"rx888 USB speed: %s\n",usb_speeds[usb_speed]);
else
fprintf(stdout,"Unknown rx888 USB speed index %d\n",usb_speed);
if(usb_speed < LIBUSB_SPEED_SUPER){
fprintf(stdout,"rx888 USB device is not at least SuperSpeed; is it plugged into a blue USB jack?\n");
goto end;
}
// Stop and reopen in case it was left running - KA9Q
usleep(5000);
command_send(sdr->dev_handle,STOPFX3,0);
{
int r = libusb_reset_device(sdr->dev_handle);
if(r != 0){
fprintf(stdout,"reset failed, %d\n",r);
}
}
{
int ret = libusb_kernel_driver_active(sdr->dev_handle,0);
if(ret != 0){
fprintf(stdout,"Kernel driver active. Trying to detach kernel driver\n");
ret = libusb_detach_kernel_driver(sdr->dev_handle,0);
if(ret != 0){
fprintf(stdout,"Could not detach kernel driver from an interface\n");
goto end;
}
}
}
libusb_get_config_descriptor(device, 0, &sdr->config);
{
int const ret = libusb_claim_interface(sdr->dev_handle, 0);
if(ret != 0){
fprintf(stderr, "Error claiming USB interface\n");
goto end;
}
}
{
// All this just to get sdr->pktsize?
struct libusb_interface_descriptor const *interfaceDesc = &(sdr->config->interface[0].altsetting[0]);
assert(interfaceDesc != NULL);
struct libusb_endpoint_descriptor const *endpointDesc = &interfaceDesc->endpoint[0];
assert(endpointDesc != NULL);
struct libusb_ss_endpoint_companion_descriptor *ep_comp = NULL;
int const rc = libusb_get_ss_endpoint_companion_descriptor(NULL,endpointDesc,&ep_comp);
if(rc != 0){
fprintf(stdout,"libusb_get_ss_endpoint_companion_descriptor returned: %s (%d)\n",libusb_error_name(rc),rc);
goto end;
}
assert(ep_comp != NULL);
sdr->pktsize = endpointDesc->wMaxPacketSize * (ep_comp->bMaxBurst + 1);
libusb_free_ss_endpoint_companion_descriptor(ep_comp);
}
sdr->databuffers = (u_char **)calloc(queuedepth,sizeof(u_char *));
if(sdr->databuffers == NULL){
fprintf(stdout,"Failed to allocate data buffers\n");
goto end;
}
sdr->transfers = (struct libusb_transfer **)calloc(queuedepth,sizeof(struct libusb_transfer *));
if(sdr->transfers == NULL){
fprintf(stdout,"Failed to allocate transfer buffers\n");
goto end;
}
for(unsigned int i = 0; i < queuedepth; i++){
sdr->databuffers[i] = (u_char *)malloc(reqsize * sdr->pktsize);
if(sdr->databuffers[i] == NULL)
goto end;
sdr->transfers[i] = libusb_alloc_transfer(0);
}
sdr->queuedepth = queuedepth;
sdr->reqsize = reqsize;
return 0;
end:;
free_transfer_buffers(sdr->databuffers,sdr->transfers,sdr->queuedepth);
FREE(sdr->transfers);
FREE(sdr->databuffers);
if(sdr->dev_handle != NULL)
libusb_release_interface(sdr->dev_handle,0);
sdr->dev_handle = NULL;
if(sdr->config)
libusb_free_config_descriptor(sdr->config);
sdr->config = NULL;
if(sdr->dev_handle)
libusb_close(sdr->dev_handle);
sdr->dev_handle = NULL;
libusb_exit(NULL);
return -1;
}
static void rx888_set_dither_and_randomizer(struct sdrstate *sdr,bool dither,bool randomizer){
assert(sdr != NULL);
if(dither)
sdr->gpios |= DITH;
if(randomizer)
sdr->gpios |= RANDO;
usleep(5000);
command_send(sdr->dev_handle,GPIOFX3,sdr->gpios);
sdr->dither = dither;
sdr->randomizer = randomizer;
}
static void rx888_set_att(struct sdrstate *sdr,float att,bool vhf){
assert(sdr != NULL);
struct frontend *frontend = sdr->frontend;
assert(frontend != NULL);
usleep(5000);
frontend->rf_atten = att;
sdr->scale = scale_AD(frontend);
if(!vhf){
int const arg = (int)(att * 2);
argument_send(sdr->dev_handle,DAT31_ATT,arg);
} else {
int const arg = (int)att;
argument_send(sdr->dev_handle,R82XX_ATTENUATOR,arg);
}
}
static void rx888_set_gain(struct sdrstate *sdr,float gain,bool vhf){
assert(sdr != NULL);
struct frontend *frontend = sdr->frontend;
assert(frontend != NULL);
usleep(5000);
if(!vhf){
int const arg = gain2val(gain);
argument_send(sdr->dev_handle,AD8340_VGA,arg);
frontend->rf_gain = val2gain(arg); // Store actual nearest value
} else {
int const arg = (int)gain;
argument_send(sdr->dev_handle,R82XX_VGA,arg);
}
sdr->scale = scale_AD(frontend);
}
// see: SiLabs Application Note AN619 - Manually Generating an Si5351 Register Map (https://www.silabs.com/documents/public/application-notes/AN619.pdf)
static double rx888_set_samprate(struct sdrstate *sdr,double const reference,unsigned int const samprate){
assert(sdr != NULL);
#if 0
// Should we always do it ourselves?
if(reference == Default_reference){
// Use firmware to set sample rate
command_send(sdr->dev_handle,STARTADC,samprate);
return actual_freq((double)samprate);
}
if(samprate == 0){
// power off clock 0
control_send_byte(sdr->dev_handle,I2CWFX3,SI5351_ADDR,SI5351_REGISTER_CLK_BASE+0,SI5351_VALUE_CLK_PDN);
return 0;
}
#endif
// if the requested sample rate is below 1MHz, use an R divider right before the output pin
double r_samprate = samprate;
uint8_t rdiv = 0;
while (r_samprate < 1e6 && rdiv <= 7) {
r_samprate *= 2.0;
rdiv += 1;
}
if (r_samprate < 1e6) {
fprintf(stdout,"ERROR - requested sample rate is too low: %'d\n",samprate);
return 0;
}
/* choose an even integer for the output MS */
// if this is ever changed from an integer, make sure SI5351_VALUE_MS_INT isn't set later on
uint32_t output_ms = ((uint32_t)(SI5351_MAX_VCO_FREQ / r_samprate));
output_ms -= output_ms % 2;
if (output_ms < 4 || output_ms > 900) {
fprintf(stdout,"ERROR - invalid output MS: %d (samprate=%'d)\n",output_ms,samprate);
return 0;
}
// This sets the VCO frequency
double const vco_frequency = r_samprate * output_ms;
// Now pick a fractional divisor for the VCO synthesizer feedback loop to give us this VCO frequency from the reference
double const feedback_ms = vco_frequency / reference;
/* find a good rational approximation for feedback_ms */
uint32_t a,b,c;
rational_approximation(feedback_ms,SI5351_MAX_DENOMINATOR,&a,&b,&c);
double const pll_ratio = a + (double)b / (double)c;
double const vco = reference * pll_ratio;
double output_samprate = vco / (output_ms * (1 << rdiv));
fprintf(stdout,"Nominal samprate %'d, reference %'lf, feedback divisor %d + %d/%d, VCO %'lf, integer divisor %d * %d, output = %'lf\n",
samprate,
reference,
a,b,c,
vco,
output_ms,
1<<rdiv,
output_samprate);
// Now fine-tune the output divider to get closer
double output_divider = vco / (samprate * (1 << rdiv));
uint32_t d,e,f;
rational_approximation(output_divider,SI5351_MAX_DENOMINATOR,&d,&e,&f);
output_divider = d + (double)e/f;
output_samprate = vco / (output_divider * (1 << rdiv));
fprintf(stdout,"Output divider %d + %d/%d, rdiv %d, actual samprate = %'lf\n",d,e,f,(1<<rdiv),output_samprate);
/* configure clock input and PLL */
uint32_t const b_over_c = 128 * b / c;
uint32_t const msn_p1 = 128 * a + b_over_c - 512;
uint32_t const msn_p2 = 128 * b - c * b_over_c;
uint32_t const msn_p3 = c;
uint8_t data_clkin[] = {
(msn_p3 & 0x0000ff00) >> 8,
(msn_p3 & 0x000000ff) >> 0,
(msn_p1 & 0x00030000) >> 16,
(msn_p1 & 0x0000ff00) >> 8,
(msn_p1 & 0x000000ff) >> 0,
(msn_p3 & 0x000f0000) >> 12 | (msn_p2 & 0x000f0000) >> 16,
(msn_p2 & 0x0000ff00) >> 8,
(msn_p2 & 0x000000ff) >> 0
};
control_send(sdr->dev_handle,I2CWFX3,SI5351_ADDR,SI5351_REGISTER_MSNA_BASE,data_clkin,sizeof(data_clkin));
/* configure clock output */
/* since the output divider is an even integer a = output_ms, b = 0, c = 1 */
uint32_t const e_over_f = 128 * e / f;
uint32_t const ms_p1 = 128 * d + e_over_f - 512;
uint32_t const ms_p2 = 128 * e - f * e_over_f;
uint32_t const ms_p3 = f;
uint8_t data_clkout[] = {
(ms_p3 & 0x0000ff00) >> 8,
(ms_p3 & 0x000000ff) >> 0,
rdiv << 5 | (ms_p1 & 0x00030000) >> 16,
(ms_p1 & 0x0000ff00) >> 8,
(ms_p1 & 0x000000ff) >> 0,
(ms_p3 & 0x000f0000) >> 12 | (ms_p2 & 0x000f0000) >> 16,
(ms_p2 & 0x0000ff00) >> 8,
(ms_p2 & 0x000000ff) >> 0
};
control_send(sdr->dev_handle,I2CWFX3,SI5351_ADDR,SI5351_REGISTER_MS0_BASE,data_clkout,sizeof(data_clkout));
return output_samprate;
}
static void rx888_set_hf_mode(struct sdrstate *sdr){
command_send(sdr->dev_handle,TUNERSTDBY,0); // Stop Tuner
// switch to HF Antenna
usleep(5000);
sdr->gpios &= ~VHF_EN;
command_send(sdr->dev_handle,GPIOFX3,sdr->gpios);
}
#if 0
// Pretty sure this is broken
static double rx888_set_tuner_frequency(struct sdrstate *sdr,double frequency){
assert(sdr != NULL);
struct frontend *frontend = sdr->frontend;
if(frequency == frontend->frequency)
return frequency;
if(frequency != 0.0){
// disable HF by set max ATT
rx888_set_att(sdr,31.5,false); // max att 31.5 dB
// switch to VHF Antenna
usleep(5000);
sdr->gpios |= VHF_EN;
command_send(sdr->dev_handle,GPIOFX3,sdr->gpios);
// high gain, 0db
uint8_t gain = 0x80 | 3;
argument_send(sdr->dev_handle,AD8340_VGA,gain);
// Enable Tuner reference clock
uint32_t ref = R828D_FREQ;
command_send(sdr->dev_handle,TUNERINIT,ref); // Initialize Tuner
command_send(sdr->dev_handle,TUNERTUNE,(uint64_t)frequency);
} else {
rx888_set_hf_mode(sdr);