-
Notifications
You must be signed in to change notification settings - Fork 1k
/
Copy pathRF24.cpp
1570 lines (1249 loc) · 46.2 KB
/
RF24.cpp
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
/*
Copyright (C) 2011 J. Coliz <maniacbug@ymail.com>
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
version 2 as published by the Free Software Foundation.
*/
#include "nRF24L01.h"
#include "RF24_config.h"
#include "RF24.h"
/****************************************************************************/
void RF24::csn(bool mode)
{
#if defined(RF24_TINY)
if (ce_pin != csn_pin) {
digitalWrite(csn_pin, mode);
}
else {
if (mode == HIGH) {
PORTB |= (1<<PINB2); // SCK->CSN HIGH
delayMicroseconds(100); // allow csn to settle.
}
else {
PORTB &= ~(1<<PINB2); // SCK->CSN LOW
delayMicroseconds(11); // allow csn to settle
}
}
// Return, CSN toggle complete
return;
#elif defined(ARDUINO) && !defined(RF24_SPI_TRANSACTIONS)
// Minimum ideal SPI bus speed is 2x data rate
// If we assume 2Mbs data rate and 16Mhz clock, a
// divider of 4 is the minimum we want.
// CLK:BUS 8Mhz:2Mhz, 16Mhz:4Mhz, or 20Mhz:5Mhz
#if !defined(SOFTSPI)
_SPI.setBitOrder(MSBFIRST);
_SPI.setDataMode(SPI_MODE0);
#if !defined(F_CPU) || F_CPU < 20000000
_SPI.setClockDivider(SPI_CLOCK_DIV2);
#elif F_CPU < 40000000
_SPI.setClockDivider(SPI_CLOCK_DIV4);
#elif F_CPU < 80000000
_SPI.setClockDivider(SPI_CLOCK_DIV8);
#elif F_CPU < 160000000
_SPI.setClockDivider(SPI_CLOCK_DIV16);
#elif F_CPU < 320000000
_SPI.setClockDivider(SPI_CLOCK_DIV32);
#elif F_CPU < 640000000
_SPI.setClockDivider(SPI_CLOCK_DIV64);
#elif F_CPU < 1280000000
_SPI.setClockDivider(SPI_CLOCK_DIV128);
#else
#error "Unsupported CPU frequency. Please set correct SPI divider."
#endif
#endif
#elif defined(RF24_RPi)
if(!mode)
_SPI.chipSelect(csn_pin);
#endif // defined(RF24_RPi)
#if !defined(RF24_LINUX)
digitalWrite(csn_pin, mode);
delayMicroseconds(csDelay);
#endif // !defined(RF24_LINUX)
}
/****************************************************************************/
void RF24::ce(bool level)
{
//Allow for 3-pin use on ATTiny
if (ce_pin != csn_pin) {
digitalWrite(ce_pin, level);
}
}
/****************************************************************************/
inline void RF24::beginTransaction()
{
#if defined(RF24_SPI_TRANSACTIONS)
_SPI.beginTransaction(SPISettings(spi_speed, MSBFIRST, SPI_MODE0));
#endif // defined(RF24_SPI_TRANSACTIONS)
csn(LOW);
}
/****************************************************************************/
inline void RF24::endTransaction()
{
csn(HIGH);
#if defined(RF24_SPI_TRANSACTIONS)
_SPI.endTransaction();
#endif // defined(RF24_SPI_TRANSACTIONS)
}
/****************************************************************************/
uint8_t RF24::read_register(uint8_t reg, uint8_t* buf, uint8_t len)
{
uint8_t status;
#if defined(RF24_LINUX)
beginTransaction(); //configures the spi settings for RPi, locks mutex and setting csn low
uint8_t * prx = spi_rxbuff;
uint8_t * ptx = spi_txbuff;
uint8_t size = len + 1; // Add register value to transmit buffer
*ptx++ = ( R_REGISTER | ( REGISTER_MASK & reg ) );
while (len--){ *ptx++ = RF24_NOP; } // Dummy operation, just for reading
_SPI.transfernb( (char *) spi_txbuff, (char *) spi_rxbuff, size);
status = *prx++; // status is 1st byte of receive buffer
// decrement before to skip status byte
while ( --size ){ *buf++ = *prx++; }
endTransaction(); //unlocks mutex and setting csn high
#else // !defined(RF24_LINUX)
beginTransaction();
status = _SPI.transfer(R_REGISTER | (REGISTER_MASK & reg));
while (len--) {
*buf++ = _SPI.transfer(0xff);
}
endTransaction();
#endif // !defined(RF24_LINUX)
return status;
}
/****************************************************************************/
uint8_t RF24::read_register(uint8_t reg)
{
uint8_t result;
#if defined(RF24_LINUX)
beginTransaction();
uint8_t * prx = spi_rxbuff;
uint8_t * ptx = spi_txbuff;
*ptx++ = ( R_REGISTER | ( REGISTER_MASK & reg ) );
*ptx++ = RF24_NOP ; // Dummy operation, just for reading
_SPI.transfernb( (char *) spi_txbuff, (char *) spi_rxbuff, 2);
result = *++prx; // result is 2nd byte of receive buffer
endTransaction();
#else // !defined(RF24_LINUX)
beginTransaction();
_SPI.transfer(R_REGISTER | (REGISTER_MASK & reg));
result = _SPI.transfer(0xff);
endTransaction();
#endif // !defined(RF24_LINUX)
return result;
}
/****************************************************************************/
uint8_t RF24::write_register(uint8_t reg, const uint8_t* buf, uint8_t len)
{
uint8_t status;
#if defined(RF24_LINUX)
beginTransaction();
uint8_t * prx = spi_rxbuff;
uint8_t * ptx = spi_txbuff;
uint8_t size = len + 1; // Add register value to transmit buffer
*ptx++ = ( W_REGISTER | ( REGISTER_MASK & reg ) );
while ( len-- )
*ptx++ = *buf++;
_SPI.transfernb( (char *) spi_txbuff, (char *) spi_rxbuff, size);
status = *prx; // status is 1st byte of receive buffer
endTransaction();
#else // !defined(RF24_LINUX)
beginTransaction();
status = _SPI.transfer(W_REGISTER | (REGISTER_MASK & reg));
while (len--) {
_SPI.transfer(*buf++);
}
endTransaction();
#endif // !defined(RF24_LINUX)
return status;
}
/****************************************************************************/
uint8_t RF24::write_register(uint8_t reg, uint8_t value)
{
uint8_t status;
IF_SERIAL_DEBUG(printf_P(PSTR("write_register(%02x,%02x)\r\n"), reg, value));
#if defined(RF24_LINUX)
beginTransaction();
uint8_t * prx = spi_rxbuff;
uint8_t * ptx = spi_txbuff;
*ptx++ = ( W_REGISTER | ( REGISTER_MASK & reg ) );
*ptx = value ;
_SPI.transfernb( (char *) spi_txbuff, (char *) spi_rxbuff, 2);
status = *prx++; // status is 1st byte of receive buffer
endTransaction();
#else // !defined(RF24_LINUX)
beginTransaction();
status = _SPI.transfer(W_REGISTER | (REGISTER_MASK & reg));
_SPI.transfer(value);
endTransaction();
#endif // !defined(RF24_LINUX)
return status;
}
/****************************************************************************/
uint8_t RF24::write_payload(const void* buf, uint8_t data_len, const uint8_t writeType)
{
uint8_t status;
const uint8_t* current = reinterpret_cast<const uint8_t*>(buf);
data_len = rf24_min(data_len, payload_size);
uint8_t blank_len = dynamic_payloads_enabled ? 0 : payload_size - data_len;
//printf("[Writing %u bytes %u blanks]",data_len,blank_len);
IF_SERIAL_DEBUG(printf("[Writing %u bytes %u blanks]\n", data_len, blank_len); );
#if defined(RF24_LINUX)
beginTransaction();
uint8_t * prx = spi_rxbuff;
uint8_t * ptx = spi_txbuff;
uint8_t size;
size = data_len + blank_len + 1 ; // Add register value to transmit buffer
*ptx++ = writeType;
while ( data_len-- )
*ptx++ = *current++;
while ( blank_len-- )
*ptx++ = 0;
_SPI.transfernb( (char *) spi_txbuff, (char *) spi_rxbuff, size);
status = *prx; // status is 1st byte of receive buffer
endTransaction();
#else // !defined(RF24_LINUX)
beginTransaction();
status = _SPI.transfer(writeType);
while (data_len--) {
_SPI.transfer(*current++);
}
while (blank_len--) {
_SPI.transfer(0);
}
endTransaction();
#endif // !defined(RF24_LINUX)
return status;
}
/****************************************************************************/
uint8_t RF24::read_payload(void* buf, uint8_t data_len)
{
uint8_t status;
uint8_t* current = reinterpret_cast<uint8_t*>(buf);
if (data_len > payload_size) {
data_len = payload_size;
}
uint8_t blank_len = dynamic_payloads_enabled ? 0 : payload_size - data_len;
//printf("[Reading %u bytes %u blanks]",data_len,blank_len);
IF_SERIAL_DEBUG(printf("[Reading %u bytes %u blanks]\n", data_len, blank_len); );
#if defined(RF24_LINUX)
beginTransaction();
uint8_t * prx = spi_rxbuff;
uint8_t * ptx = spi_txbuff;
uint8_t size;
size = data_len + blank_len + 1; // Add register value to transmit buffer
*ptx++ = R_RX_PAYLOAD;
while(--size)
*ptx++ = RF24_NOP;
size = data_len + blank_len + 1; // Size has been lost during while, re affect
_SPI.transfernb( (char *) spi_txbuff, (char *) spi_rxbuff, size);
status = *prx++; // 1st byte is status
if (data_len > 0) {
while ( --data_len ) // Decrement before to skip 1st status byte
*current++ = *prx++;
*current = *prx;
}
endTransaction();
#else // !defined(RF24_LINUX)
beginTransaction();
status = _SPI.transfer(R_RX_PAYLOAD);
while (data_len--) {
*current++ = _SPI.transfer(0xFF);
}
while (blank_len--) {
_SPI.transfer(0xff);
}
endTransaction();
#endif // !defined(RF24_LINUX)
return status;
}
/****************************************************************************/
uint8_t RF24::flush_rx(void)
{
return spiTrans(FLUSH_RX);
}
/****************************************************************************/
uint8_t RF24::flush_tx(void)
{
return spiTrans(FLUSH_TX);
}
/****************************************************************************/
uint8_t RF24::spiTrans(uint8_t cmd)
{
uint8_t status;
beginTransaction();
status = _SPI.transfer(cmd);
endTransaction();
return status;
}
/****************************************************************************/
uint8_t RF24::get_status(void)
{
return spiTrans(RF24_NOP);
}
/****************************************************************************/
#if !defined(MINIMAL)
void RF24::print_status(uint8_t status)
{
printf_P(PSTR("STATUS\t\t = 0x%02x RX_DR=%x TX_DS=%x MAX_RT=%x RX_P_NO=%x TX_FULL=%x\r\n"), status, (status & _BV(RX_DR)) ? 1 : 0,
(status & _BV(TX_DS)) ? 1 : 0, (status & _BV(MAX_RT)) ? 1 : 0, ((status >> RX_P_NO) & 0x07), (status & _BV(TX_FULL)) ? 1 : 0);
}
/****************************************************************************/
void RF24::print_observe_tx(uint8_t value)
{
printf_P(PSTR("OBSERVE_TX=%02x: POLS_CNT=%x ARC_CNT=%x\r\n"), value, (value >> PLOS_CNT) & 0x0F, (value >> ARC_CNT) & 0x0F);
}
/****************************************************************************/
void RF24::print_byte_register(const char* name, uint8_t reg, uint8_t qty)
{
//char extra_tab = strlen_P(name) < 8 ? '\t' : 0;
//printf_P(PSTR(PRIPSTR"\t%c ="),name,extra_tab);
#if defined(RF24_LINUX)
printf("%s\t =", name);
#else // !defined(RF24_LINUX)
printf_P(PSTR(PRIPSTR
"\t ="),name);
#endif // !defined(RF24_LINUX)
while (qty--) {
printf_P(PSTR(" 0x%02x"), read_register(reg++));
}
printf_P(PSTR("\r\n"));
}
/****************************************************************************/
void RF24::print_address_register(const char* name, uint8_t reg, uint8_t qty)
{
#if defined(RF24_LINUX)
printf("%s\t =",name);
#else // !defined(RF24_LINUX)
printf_P(PSTR(PRIPSTR"\t ="),name);
#endif // !defined(RF24_LINUX)
while (qty--) {
uint8_t buffer[addr_width];
read_register(reg++, buffer, sizeof buffer);
printf_P(PSTR(" 0x"));
uint8_t* bufptr = buffer + sizeof buffer;
while (--bufptr >= buffer) {
printf_P(PSTR("%02x"), *bufptr);
}
}
printf_P(PSTR("\r\n"));
}
#endif
/****************************************************************************/
RF24::RF24(uint16_t _cepin, uint16_t _cspin, uint32_t _spi_speed)
:ce_pin(_cepin), csn_pin(_cspin),spi_speed(_spi_speed), payload_size(32), dynamic_payloads_enabled(false), addr_width(5),
csDelay(5)//,pipe0_reading_address(0)
{
pipe0_reading_address[0] = 0;
if(spi_speed <= 35000){ //Handle old BCM2835 speed constants, default to RF24_SPI_SPEED
spi_speed = RF24_SPI_SPEED;
}
}
/****************************************************************************/
void RF24::setChannel(uint8_t channel)
{
const uint8_t max_channel = 125;
write_register(RF_CH, rf24_min(channel, max_channel));
}
uint8_t RF24::getChannel()
{
return read_register(RF_CH);
}
/****************************************************************************/
void RF24::setPayloadSize(uint8_t size)
{
payload_size = rf24_min(size, 32);
}
/****************************************************************************/
uint8_t RF24::getPayloadSize(void)
{
return payload_size;
}
/****************************************************************************/
#if !defined(MINIMAL)
static const PROGMEM char rf24_datarate_e_str_0[] = "1MBPS";
static const PROGMEM char rf24_datarate_e_str_1[] = "2MBPS";
static const PROGMEM char rf24_datarate_e_str_2[] = "250KBPS";
static const PROGMEM char * const rf24_datarate_e_str_P[] = {
rf24_datarate_e_str_0,
rf24_datarate_e_str_1,
rf24_datarate_e_str_2,
};
static const PROGMEM char rf24_model_e_str_0[] = "nRF24L01";
static const PROGMEM char rf24_model_e_str_1[] = "nRF24L01+";
static const PROGMEM char * const rf24_model_e_str_P[] = {
rf24_model_e_str_0,
rf24_model_e_str_1,
};
static const PROGMEM char rf24_crclength_e_str_0[] = "Disabled";
static const PROGMEM char rf24_crclength_e_str_1[] = "8 bits";
static const PROGMEM char rf24_crclength_e_str_2[] = "16 bits" ;
static const PROGMEM char * const rf24_crclength_e_str_P[] = {
rf24_crclength_e_str_0,
rf24_crclength_e_str_1,
rf24_crclength_e_str_2,
};
static const PROGMEM char rf24_pa_dbm_e_str_0[] = "PA_MIN";
static const PROGMEM char rf24_pa_dbm_e_str_1[] = "PA_LOW";
static const PROGMEM char rf24_pa_dbm_e_str_2[] = "PA_HIGH";
static const PROGMEM char rf24_pa_dbm_e_str_3[] = "PA_MAX";
static const PROGMEM char * const rf24_pa_dbm_e_str_P[] = {
rf24_pa_dbm_e_str_0,
rf24_pa_dbm_e_str_1,
rf24_pa_dbm_e_str_2,
rf24_pa_dbm_e_str_3,
};
#if defined(RF24_LINUX)
static const char rf24_csn_e_str_0[] = "CE0 (PI Hardware Driven)";
static const char rf24_csn_e_str_1[] = "CE1 (PI Hardware Driven)";
static const char rf24_csn_e_str_2[] = "CE2 (PI Hardware Driven)";
static const char rf24_csn_e_str_3[] = "Custom GPIO Software Driven";
static const char * const rf24_csn_e_str_P[] = {
rf24_csn_e_str_0,
rf24_csn_e_str_1,
rf24_csn_e_str_2,
rf24_csn_e_str_3,
};
#endif // defined(RF24_LINUX)
void RF24::printDetails(void)
{
#if defined(RF24_LINUX)
printf("================ SPI Configuration ================\n" );
printf("CSN Pin \t = %d\n", csn_pin);
printf("CE Pin \t = Custom GPIO%d\n", ce_pin );
#endif
printf_P(PSTR("SPI Speedz\t = %d Mhz\n"),(uint8_t)(spi_speed/1000000)); //Print the SPI speed on non-Linux devices
#if defined(RF24_LINUX)
printf("================ NRF Configuration ================\n");
#endif // defined(RF24_LINUX)
print_status(get_status());
print_address_register(PSTR("RX_ADDR_P0-1"), RX_ADDR_P0, 2);
print_byte_register(PSTR("RX_ADDR_P2-5"), RX_ADDR_P2, 4);
print_address_register(PSTR("TX_ADDR\t"), TX_ADDR);
print_byte_register(PSTR("RX_PW_P0-6"), RX_PW_P0, 6);
print_byte_register(PSTR("EN_AA\t"), EN_AA);
print_byte_register(PSTR("EN_RXADDR"), EN_RXADDR);
print_byte_register(PSTR("RF_CH\t"), RF_CH);
print_byte_register(PSTR("RF_SETUP"), RF_SETUP);
print_byte_register(PSTR("CONFIG\t"), NRF_CONFIG);
print_byte_register(PSTR("DYNPD/FEATURE"), DYNPD, 2);
printf_P(PSTR("Data Rate\t = "
PRIPSTR
"\r\n"),(char*)pgm_read_ptr(&rf24_datarate_e_str_P[getDataRate()]));
printf_P(PSTR("Model\t\t = "
PRIPSTR
"\r\n"),(char*)pgm_read_ptr(&rf24_model_e_str_P[isPVariant()]));
printf_P(PSTR("CRC Length\t = "
PRIPSTR
"\r\n"),(char*)pgm_read_ptr(&rf24_crclength_e_str_P[getCRCLength()]));
printf_P(PSTR("PA Power\t = "
PRIPSTR
"\r\n"),(char*)pgm_read_ptr(&rf24_pa_dbm_e_str_P[getPALevel()]));
printf_P(PSTR("ARC\t\t = %d\r\n"), getARC());
}
#endif // !defined(MINIMAL)
/****************************************************************************/
bool RF24::begin(void)
{
#if defined(RF24_LINUX)
#if defined(MRAA)
GPIO();
gpio.begin(ce_pin,csn_pin);
#endif
#if defined(RF24_RPi)
switch(csn_pin){ //Ensure valid hardware CS pin
case 0: break;
case 1: break;
// Allow BCM2835 enums for RPi
case 8: csn_pin = 0; break;
case 7: csn_pin = 1; break;
case 18: csn_pin = 10; break; //to make it work on SPI1
case 17: csn_pin = 11; break;
case 16: csn_pin = 12; break;
default: csn_pin = 0; break;
}
#endif // RF24_RPi
_SPI.begin(csn_pin,spi_speed);
pinMode(ce_pin,OUTPUT);
ce(LOW);
delay(100);
#elif defined(LITTLEWIRE)
pinMode(csn_pin,OUTPUT);
_SPI.begin();
csn(HIGH);
#elif defined(XMEGA_D3)
if (ce_pin != csn_pin) {
pinMode(ce_pin,OUTPUT);
};
_SPI.begin(csn_pin);
ce(LOW);
csn(HIGH);
delay(200);
#else
// Initialize pins
if (ce_pin != csn_pin) {
pinMode(ce_pin, OUTPUT);
pinMode(csn_pin, OUTPUT);
}
_SPI.begin();
ce(LOW);
csn(HIGH);
#if defined(__ARDUINO_X86__)
delay(100);
#endif
#endif //Linux
// Must allow the radio time to settle else configuration bits will not necessarily stick.
// This is actually only required following power up but some settling time also appears to
// be required after resets too. For full coverage, we'll always assume the worst.
// Enabling 16b CRC is by far the most obvious case if the wrong timing is used - or skipped.
// Technically we require 4.5ms + 14us as a worst case. We'll just call it 5ms for good measure.
// WARNING: Delay is based on P-variant whereby non-P *may* require different timing.
delay(5);
// Set 1500uS (minimum for 32B payload in ESB@250KBPS) timeouts, to make testing a little easier
// WARNING: If this is ever lowered, either 250KBS mode with AA is broken or maximum packet
// sizes must never be used. See documentation for a more complete explanation.
setRetries(5, 15);
// Then set the data rate to the slowest (and most reliable) speed supported by all
// hardware.
setDataRate(RF24_1MBPS);
// Disable dynamic payloads, to match dynamic_payloads_enabled setting - Reset value is 0
toggle_features();
write_register(FEATURE, 0);
write_register(DYNPD, 0);
dynamic_payloads_enabled = false;
ack_payloads_enabled = false;
// Reset current status
// Notice reset and flush is the last thing we do
write_register(NRF_STATUS, _BV(RX_DR) | _BV(TX_DS) | _BV(MAX_RT));
// Set up default configuration. Callers can always change it later.
// This channel should be universally safe and not bleed over into adjacent
// spectrum.
setChannel(76);
// Flush buffers
flush_rx();
flush_tx();
// Clear CONFIG register, Enable PTX, Power Up & 16-bit CRC
// Do not write CE high so radio will remain in standby I mode
// PTX should use only 22uA of power
write_register(NRF_CONFIG, (_BV(EN_CRC) | _BV(CRCO)) );
config_reg = read_register(NRF_CONFIG);
powerUp();
// if config is not set correctly then there was a bad response from module
return config_reg == (_BV(EN_CRC) | _BV(CRCO) | _BV(PWR_UP)) ? true : false;
}
/****************************************************************************/
bool RF24::isChipConnected()
{
uint8_t setup = read_register(SETUP_AW);
if (setup >= 1 && setup <= 3) {
return true;
}
return false;
}
/****************************************************************************/
void RF24::startListening(void)
{
#if !defined(RF24_TINY) && !defined(LITTLEWIRE)
powerUp();
#endif
/* Notes Once ready for next release
* 1. Can update stopListening() to use config_reg var and ack_payloads_enabled var instead of SPI rx/tx
* 2. Update txDelay defaults: 240 for 2MBPS, 280 for 1MBPS, 505 for 250KBPS per initial testing
* 3. Allows time for slower devices to update with the faster startListening() function prior to updating stopListening() & adjusting txDelay
*/
config_reg |= _BV(PRIM_RX);
write_register(NRF_CONFIG,config_reg);
write_register(NRF_STATUS, _BV(RX_DR) | _BV(TX_DS) | _BV(MAX_RT));
ce(HIGH);
// Restore the pipe0 adddress, if exists
if (pipe0_reading_address[0] > 0) {
write_register(RX_ADDR_P0, pipe0_reading_address, addr_width);
} else {
closeReadingPipe(0);
}
if(ack_payloads_enabled){
flush_tx();
}
}
/****************************************************************************/
static const PROGMEM uint8_t child_pipe_enable[] = {ERX_P0, ERX_P1, ERX_P2,
ERX_P3, ERX_P4, ERX_P5};
void RF24::stopListening(void)
{
ce(LOW);
delayMicroseconds(txDelay);
if (read_register(FEATURE) & _BV(EN_ACK_PAY)) {
delayMicroseconds(txDelay); //200
flush_tx();
}
//flush_rx();
config_reg &= ~_BV(PRIM_RX);
write_register(NRF_CONFIG, (read_register(NRF_CONFIG)) & ~_BV(PRIM_RX));
#if defined(RF24_TINY) || defined(LITTLEWIRE)
// for 3 pins solution TX mode is only left with additonal powerDown/powerUp cycle
if (ce_pin == csn_pin) {
powerDown();
powerUp();
}
#endif
write_register(EN_RXADDR, read_register(EN_RXADDR) | _BV(pgm_read_byte(&child_pipe_enable[0]))); // Enable RX on pipe0
//delayMicroseconds(100);
}
/****************************************************************************/
void RF24::powerDown(void)
{
ce(LOW); // Guarantee CE is low on powerDown
config_reg &= ~_BV(PWR_UP);
write_register(NRF_CONFIG,config_reg);
}
/****************************************************************************/
//Power up now. Radio will not power down unless instructed by MCU for config changes etc.
void RF24::powerUp(void)
{
// if not powered up then power up and wait for the radio to initialize
if (!(config_reg & _BV(PWR_UP))) {
config_reg |= _BV(PWR_UP);
write_register(NRF_CONFIG, config_reg);
// For nRF24L01+ to go from power down mode to TX or RX mode it must first pass through stand-by mode.
// There must be a delay of Tpd2stby (see Table 16.) after the nRF24L01+ leaves power down mode before
// the CEis set high. - Tpd2stby can be up to 5ms per the 1.0 datasheet
delay(5);
}
}
/******************************************************************/
#if defined(FAILURE_HANDLING) || defined(RF24_LINUX)
void RF24::errNotify()
{
#if defined(SERIAL_DEBUG) || defined(RF24_LINUX)
printf_P(PSTR("RF24 HARDWARE FAIL: Radio not responding, verify pin connections, wiring, etc.\r\n"));
#endif
#if defined(FAILURE_HANDLING)
failureDetected = 1;
#else
delay(5000);
#endif
}
#endif
/******************************************************************/
//Similar to the previous write, clears the interrupt flags
bool RF24::write(const void* buf, uint8_t len, const bool multicast)
{
//Start Writing
startFastWrite(buf, len, multicast);
//Wait until complete or failed
#if defined(FAILURE_HANDLING) || defined(RF24_LINUX)
uint32_t timer = millis();
#endif // defined(FAILURE_HANDLING) || defined(RF24_LINUX)
while (!(get_status() & (_BV(TX_DS) | _BV(MAX_RT)))) {
#if defined(FAILURE_HANDLING) || defined(RF24_LINUX)
if (millis() - timer > 95) {
errNotify();
#if defined(FAILURE_HANDLING)
return 0;
#else
delay(100);
#endif
}
#endif
}
ce(LOW);
uint8_t status = write_register(NRF_STATUS, _BV(RX_DR) | _BV(TX_DS) | _BV(MAX_RT));
//Max retries exceeded
if (status & _BV(MAX_RT)) {
flush_tx(); //Only going to be 1 packet int the FIFO at a time using this method, so just flush
return 0;
}
//TX OK 1 or 0
return 1;
}
bool RF24::write(const void* buf, uint8_t len)
{
return write(buf, len, 0);
}
/****************************************************************************/
//For general use, the interrupt flags are not important to clear
bool RF24::writeBlocking(const void* buf, uint8_t len, uint32_t timeout)
{
//Block until the FIFO is NOT full.
//Keep track of the MAX retries and set auto-retry if seeing failures
//This way the FIFO will fill up and allow blocking until packets go through
//The radio will auto-clear everything in the FIFO as long as CE remains high
uint32_t timer = millis(); //Get the time that the payload transmission started
while ((get_status()
& (_BV(TX_FULL)))) { //Blocking only if FIFO is full. This will loop and block until TX is successful or timeout
if (get_status() & _BV(MAX_RT)) { //If MAX Retries have been reached
reUseTX(); //Set re-transmit and clear the MAX_RT interrupt flag
if (millis() - timer > timeout) {
return 0;
} //If this payload has exceeded the user-defined timeout, exit and return 0
}
#if defined(FAILURE_HANDLING) || defined(RF24_LINUX)
if (millis() - timer > (timeout + 95)) {
errNotify();
#if defined(FAILURE_HANDLING)
return 0;
#endif
}
#endif
}
//Start Writing
startFastWrite(buf, len, 0); //Write the payload if a buffer is clear
return 1; //Return 1 to indicate successful transmission
}
/****************************************************************************/
void RF24::reUseTX()
{
write_register(NRF_STATUS, _BV(MAX_RT)); //Clear max retry flag
spiTrans(REUSE_TX_PL);
ce(LOW); //Re-Transfer packet
ce(HIGH);
}
/****************************************************************************/
bool RF24::writeFast(const void* buf, uint8_t len, const bool multicast)
{
//Block until the FIFO is NOT full.
//Keep track of the MAX retries and set auto-retry if seeing failures
//Return 0 so the user can control the retrys and set a timer or failure counter if required
//The radio will auto-clear everything in the FIFO as long as CE remains high
#if defined(FAILURE_HANDLING) || defined(RF24_LINUX)
uint32_t timer = millis();
#endif
//Blocking only if FIFO is full. This will loop and block until TX is successful or fail
while ((get_status() & (_BV(TX_FULL)))) {
if (get_status() & _BV(MAX_RT)) {
return 0; //Return 0. The previous payload has been retransmitted
// From the user perspective, if you get a 0, just keep trying to send the same payload
}
#if defined(FAILURE_HANDLING) || defined(RF24_LINUX)
if (millis() - timer > 95) {
errNotify();
#if defined(FAILURE_HANDLING)
return 0;
#endif // defined(FAILURE_HANDLING)
}
#endif
}
//Start Writing
startFastWrite(buf, len, multicast);
return 1;
}
bool RF24::writeFast(const void* buf, uint8_t len)
{
return writeFast(buf, len, 0);
}
/****************************************************************************/
//Per the documentation, we want to set PTX Mode when not listening. Then all we do is write data and set CE high
//In this mode, if we can keep the FIFO buffers loaded, packets will transmit immediately (no 130us delay)
//Otherwise we enter Standby-II mode, which is still faster than standby mode
//Also, we remove the need to keep writing the config register over and over and delaying for 150 us each time if sending a stream of data
void RF24::startFastWrite(const void* buf, uint8_t len, const bool multicast, bool startTx)
{ //TMRh20
//write_payload( buf,len);
write_payload(buf, len, multicast ? W_TX_PAYLOAD_NO_ACK : W_TX_PAYLOAD);
if (startTx) {
ce(HIGH);
}
}
/****************************************************************************/
//Added the original startWrite back in so users can still use interrupts, ack payloads, etc
//Allows the library to pass all tests
void RF24::startWrite(const void* buf, uint8_t len, const bool multicast)
{
// Send the payload
//write_payload( buf, len );
write_payload(buf, len, multicast ? W_TX_PAYLOAD_NO_ACK : W_TX_PAYLOAD);
ce(HIGH);
#if !defined(F_CPU) || F_CPU > 20000000
delayMicroseconds(10);
#endif
ce(LOW);
}
/****************************************************************************/
bool RF24::rxFifoFull()
{
return read_register(FIFO_STATUS) & _BV(RX_FULL);
}
/****************************************************************************/
bool RF24::txStandBy()
{
#if defined(FAILURE_HANDLING) || defined(RF24_LINUX)
uint32_t timeout = millis();
#endif
while (!(read_register(FIFO_STATUS) & _BV(TX_EMPTY))) {
if (get_status() & _BV(MAX_RT)) {
write_register(NRF_STATUS, _BV(MAX_RT));
ce(LOW);
flush_tx(); //Non blocking, flush the data
return 0;
}
#if defined(FAILURE_HANDLING) || defined(RF24_LINUX)
if (millis() - timeout > 95) {
errNotify();
#if defined(FAILURE_HANDLING)
return 0;
#endif
}
#endif
}
ce(LOW); //Set STANDBY-I mode
return 1;
}
/****************************************************************************/
bool RF24::txStandBy(uint32_t timeout, bool startTx)
{
if (startTx) {
stopListening();
ce(HIGH);
}
uint32_t start = millis();