uavcan.c
24.5 KB
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
/****************************************************************************
*
* Copyright (c) 2015 PX4 Development Team. All rights reserved.
* Author: Ben Dyer <ben_dyer@mac.com>
* Pavel Kirienko <pavel.kirienko@zubax.com>
* David Sidrane <david_s5@nscdg.com>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* 3. Neither the name PX4 nor the names of its contributors may be
* used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include "boot_config.h"
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include "timer.h"
#include "uavcan.h"
#include "can.h"
#include <lib/systemlib/crc.h>
#define CAN_REQUEST_TIMEOUT 1000
#define ANY_NODE_ID 0
#define THIS_NODE 1
#define FW_SERVER 2
#define REQ_NODE 3
typedef begin_packed_struct struct dsdl_t {
uavcan_protocol_t prototype;
uint16_t signature_crc16;
uint8_t intail;
uint8_t outtail;
uint8_t mailbox : 2;
uint8_t fifo : 2;
} end_packed_struct dsdl_t;
/* Values used in filter initialization */
typedef enum uavcan_transfer_stage_t {
Initialization,
OnStartOfTransfer
} uavcan_transfer_stage_t;
typedef enum uavcan_dsdl_ignore_t {
sizeDSDLTransfers = SizeDSDL - SizeDSDLComponents + 1
} uavcan_dsdl_ignore_t;
/* Forward declaration */
extern const dsdl_t dsdl_table[sizeDSDLTransfers];
uint8_t g_uavcan_priority = PriorityAllocation;
uint8_t g_this_node_id = 0;
uint8_t g_server_node_id = 0;
static inline uavcan_dsdl_t getDSDLOffset(uavcan_dsdl_t full) { return full - (SizeDSDLComponents + 1); }
/****************************************************************************
* Name: uavcan_init_comapare_masks
*
* Description:
* This function builds the masks needed for filtering Transfers
*
* Input Parameters:
* stage - Either Initialization, OnStartOfTransfer
* protocol - A pointer to a uavcan_protocol_t to configure the filters
* masks - A pointer to a uavcan_protocol_t return the filters
*
* Returned value:
* None
*
****************************************************************************/
static void uavcan_init_comapare_masks(uavcan_transfer_stage_t stage, uavcan_protocol_t *protocol,
uavcan_protocol_t *masks)
{
switch (stage) {
default:
break;
case OnStartOfTransfer:
masks->id.u32 |= uavcan_protocol_mask(UavCanMessageSourceNodeID);
masks->tail_init.u8 |= uavcan_protocol_mask(UavCanTransferID);
break;
case Initialization:
masks->tail_init.u8 = uavcan_protocol_mask(UavCanToggle)
| uavcan_protocol_mask(UavCanStartOfTransfer);
if (protocol->msg.service_not_message) {
/* Specific Filter initialization for a Services */
masks->id.u32 = uavcan_protocol_mask(UavCanServiceTypeID)
| uavcan_protocol_mask(UavCanServiceRequestNotResponse)
| uavcan_protocol_mask(UavCanServiceDestinationNodeID)
| uavcan_protocol_mask(UavCanServiceServiceNotMessage);
if (protocol->ser.source_node_id != ANY_NODE_ID) {
masks->id.u32 |= uavcan_protocol_mask(UavCanMessageSourceNodeID);
}
} else {
/* Specific Filter initialization for a Message */
/* Is it anonymous? */
if (protocol->msg.source_node_id == ANY_NODE_ID) {
/* Intentional use of UavCanMessageTypeID because the response
* to the anonymous message is a message and the discriminator
* will be 0
*/
masks->id.u32 = uavcan_protocol_mask(UavCanMessageTypeID)
| uavcan_protocol_mask(UavCanAnonMessageServiceNotMessage);
} else {
masks->id.u32 = uavcan_protocol_mask(UavCanMessageTypeID)
| uavcan_protocol_mask(UavCanMessageServiceNotMessage)
| uavcan_protocol_mask(UavCanMessageSourceNodeID);
}
}
break;
}
}
/****************************************************************************
* Name: load_dsdl_protocol
*
* Description:
* This function builds the protocol for a given dsdl
* N.B The value set for a service is request.
*
* Input Parameters:
* dsdl - An uavcan DSDL Identifier (Auto Generated)
* direction_in_not_out - in or out bound
* protocol - A pointer to a uavcan_protocol_t to configure the filters
* masks - A pointer to a uavcan_protocol_t return the filters
*
* Returned value:
* None
*
****************************************************************************/
static const dsdl_t *load_dsdl_protocol(uavcan_dsdl_t dsdl, uavcan_direction_t rx_not_tx, uavcan_protocol_t *protocol,
uint8_t that_node_id)
{
const dsdl_t *pdsdl = &dsdl_table[getDSDLOffset(dsdl)];
protocol->id.u32 = pdsdl->prototype.id.u32;
protocol->msg.priority = g_uavcan_priority;
/* Preserver the transfer_id */
protocol->tail_init.u8 &= uavcan_protocol_mask(UavCanTransferID);
if (rx_not_tx) {
/* Rx */
protocol->tail_init.u8 |= pdsdl->intail;
/* Service */
if (pdsdl->prototype.msg.service_not_message) {
protocol->ser.dest_node_id = g_this_node_id;
protocol->ser.source_node_id = that_node_id;
}
} else {
/*
* Tx
* All Transfers sent have .source_node_id set
* to this node's id
* During allocation this value will be
* 0
*/
protocol->tail_init.u8 |= pdsdl->outtail;
protocol->msg.source_node_id = g_this_node_id;
/*
* All Service Transfer sent have
* The ser.dest_node_id
*/
if (pdsdl->prototype.msg.service_not_message) {
protocol->ser.dest_node_id = that_node_id;
}
}
return pdsdl;
}
/****************************************************************************
* Name: uavcan_tx
*
* Description:
* This function sends a single uavcan protocol based frame applying
* the tail byte.
*
* Input Parameters:
* protocol - A pointer to a uavcan_protocol_t to configure the send
* frame_data - A pointer to 8 bytes of data to be sent (all 8 bytes will be
* loaded into the CAN transmitter but only length bytes will
* be sent.
* length - The number of bytes of the frame_date (DLC field)
* mailbox - A can_fifo_mailbox_t MBxxx value to choose the outgoing
* mailbox.
*
* Returned value:
* The UavcanOk of the data sent. Anything else indicates if a timeout
* occurred.
*
****************************************************************************/
CCASSERT((int)UavcanOk == (int)CAN_OK);
static uavcan_error_t uavcan_tx(uavcan_protocol_t *protocol, uint8_t *frame_data, size_t length, uint8_t mailbox)
{
frame_data[length++] = protocol->tail_init.u8;
return can_tx(protocol->id.u32, length, frame_data, mailbox);
}
/****************************************************************************
* Name: uavcan_tx_dsdl
*
* Description:
* This function sends a uavcan protocol transfer. For a Service
* The natural case for a Service Response is to send it to the Requestor
*
* Therefore, this function assumes that id this is a Service Transfer,
* the protocol object has the destination node id set in
* protocol->ser.source_node_id.
*
* Input Parameters:
* dsdl - An Uavcan DSDL Identifier (Auto Generated)
* protocol - A pointer to a uavcan_protocol_t to configure the send,
* For a service transfer the desination node id set in
* ser.source_node_id to that of the node we are sending to.
* transfer - A pointer to the packed data of the transfer to be sent.
* length - The number of bytes of data
*
* Returned value:
* The UavcanOk of the data sent. Anything else indicates if a timeout
* occurred.
*
****************************************************************************/
uavcan_error_t uavcan_tx_dsdl(uavcan_dsdl_t dsdl, uavcan_protocol_t *protocol, const uint8_t *transfer,
size_t transfer_length)
{
/*
* Since we do not discriminate between sending a Message or a
* Service (Request or Response)
* We assume this is a response from a rx request and msg.source_node_id
* is that of the requester and that will become the ser.dest_node_id
*/
const dsdl_t *pdsdl = load_dsdl_protocol(dsdl, OutBound, protocol, protocol->ser.source_node_id);
uint8_t payload[CanPayloadLength];
/*
* Only prepend CRC if the transfer will not fit within a single frame
*/
uint32_t m = 0;
if (transfer_length > MaxUserPayloadLength) {
uint16_t transfer_crc = crc16_signature(pdsdl->signature_crc16, transfer_length, transfer);
payload[PayloadOffsetCRClsb] = (uint8_t)transfer_crc;
payload[PayloadOffsetCRCmsb] = (uint8_t)(transfer_crc >> 8u);
m = PayloadOffsetCRCdata;
}
for (uint32_t i = 0; i < transfer_length; i++) {
payload[m++] = transfer[i];
/* Is this the last byte? */
protocol->tail.eot = (i == (transfer_length - 1));
/* Either end of user portion of payload or last byte */
if (m == MaxUserPayloadLength || protocol->tail.eot) {
uavcan_error_t rv = uavcan_tx(protocol, payload, m, pdsdl->mailbox);
if (rv != UavcanOk) {
return rv;
}
/* Increment 1 bit frame sequence number */
protocol->tail.toggle ^= true;
protocol->tail.sot = false;
m = 0;
}
}
return UavcanOk;
}
/****************************************************************************
* Name: uavcan_rx
*
* Description:
* This function is called to receive a single CAN frame from the supplied
* fifo. It does not block if there is not available, but returns 0
*
* Input Parameters:
* protocol - A pointer to a uavcan_protocol_t to return the CAN ID and
* Tail byte
* frame_data - A pointer to return 8 bytes of the frame's data
* (all 8 bytes will be read from the CAN fifo but
* only length bytes will valid.
* length - A pointer to return the number of bytes of the frame_data
* (DLC field)
* fifo A can_fifo_mailbox_t fifixxx value to choose the incoming fifo.
*
* Returned value:
* The length of the data read or 0 if the fifo was empty
*
****************************************************************************/
//#define DEBUG_DTID 1
#define DEBUG_DTID_TRIGGER 4
#ifdef DEBUG_DTID
int trigger = DEBUG_DTID_TRIGGER;
int id = DEBUG_DTID;
bool msg = true;
bool svc = false;
#endif
static uint8_t uavcan_rx(uavcan_protocol_t *protocol, uint8_t *frame_data, size_t *length, uint8_t fifo)
{
uint8_t rv = can_rx(&protocol->id.u32, length, frame_data, fifo);
if (rv) {
/* Remove the tail byte from length */
*length -= 1;
/* Save the tail byte from the last byte of frame*/
protocol->tail_init.u8 = frame_data[*length];
#ifdef DEBUG_DTID
#pragma message("!!!!!!! DEBUG_DTID is enabled !!!!")
static volatile int count = 0;
if ((msg && protocol->msg.type_id == id)
|| (svc && protocol->ser.type_id == id)
) {
if (count++ == trigger) {
count = 0;
static volatile int j = 0;
j++;
}
}
#endif
}
return rv;
}
/****************************************************************************
* Name: uavcan_rx_dsdl
*
* Description:
* This function receives a uavcan protocol transfer.
* For a Service the natural case for a Service Request is to receive from
* 1) Any Node
* 2) The established Server.
*
* Therefore, this function assumes that id this is a Service Transfer,
* the protocol object has the destination node id set in
* protocol->ser.source_node_id.
*
*
* Input Parameters:
* dsdl - An Uavcan DSDL Identifier (Auto Generated)
* protocol - A pointer to a uavcan_protocol_t to configure the receive,
* based the dsdl for the DTID Service.
* If the request must come from a specific server
* then protocol->ser.source_node_id, should be set
* to that node id;
*
* in_out_transfer_length - The number of bytes of data to receive and the
* number received.
* timeout_ms - The amount of time in mS to wait for the initial transfer
*
* Returned value:
* uavcan_error_t
*
****************************************************************************/
uavcan_error_t uavcan_rx_dsdl(uavcan_dsdl_t dsdl, uavcan_protocol_t *protocol,
uint8_t *transfer, size_t *in_out_transfer_length,
uint32_t timeout_ms)
{
const dsdl_t *pdsdl = load_dsdl_protocol(dsdl, InBound, protocol, protocol->msg.source_node_id);
bl_timer_id timer = timer_allocate(modeTimeout | modeStarted, timeout_ms, 0);
/*
* Set up comparison masks
* In the tail we care about the initial state sot, eot and toggle
* In the CAN ID We care about the Service Type ID, RequestNotResponse,
* ServiceNotMessage, and the destination id
* If the source id is not ANY_NODE_ID, that that must match too.
*/
uavcan_protocol_t masks;
uavcan_init_comapare_masks(Initialization, protocol, &masks);
uint8_t timeout = false;
uint16_t transfer_crc = 0;
size_t total_rx = 0;
uavcan_protocol_t rx_protocol;
do {
uint8_t payload[CanPayloadLength];
size_t rx_length;
if (!uavcan_rx(&rx_protocol, payload, &rx_length, pdsdl->fifo)
|| BadTailState == (rx_protocol.tail_init.u8 & BadTailState)
|| ((rx_protocol.id.u32 ^ protocol->id.u32) & masks.id.u32)
|| ((rx_protocol.tail_init.u8 ^ protocol->tail_init.u8) & masks.tail_init.u8)) {
continue;
}
timer_restart(timer, timeout_ms);
/*
If this is the first frame, capture the actual source node ID and
transfer ID for future comparisons
*/
size_t payload_index = 0;
/* Is this the start of transfer? */
if (rx_protocol.tail.sot) {
/*
* We expect only one Start Of Transfer per transfer
* So knock it down
*/
protocol->tail.sot = false;
/* Discard any data */
total_rx = 0;
/*
* Capture the source node id
* and the Transfer Id
*/
protocol->msg.source_node_id = rx_protocol.msg.source_node_id;
protocol->tail.transfer_id = rx_protocol.tail.transfer_id;
/*
* This is the start of transfer - update the
* masks for this phase or the transfer were
* source_node_id is known and transfer_id
* matters. From now on match source node and
* transfer ID too
*/
uavcan_init_comapare_masks(OnStartOfTransfer, protocol, &masks);
/* Is this a multi-frame transfer? */
if (rx_protocol.tail.eot == false) {
/* Capture the frame CRC */
transfer_crc = uavcan_make_uint16(payload[PayloadOffsetCRClsb], payload[PayloadOffsetCRCmsb]);
/*
* When the CRC is prepended to the payload
* the index of the data is past the CRC
*/
payload_index = PayloadOffsetCRCdata;
rx_length -= PayloadOffsetCRCdata;
}
}
if (rx_protocol.tail.transfer_id > protocol->tail.transfer_id
|| total_rx >= *in_out_transfer_length) {
uavcan_init_comapare_masks(Initialization, protocol, &masks);
protocol->tail.sot = true;
protocol->tail.toggle = false;
} else if (rx_protocol.tail.transfer_id < protocol->tail.transfer_id) {
continue;
}
/* Copy transfer bytes to the transfer */
if (total_rx + rx_length <= *in_out_transfer_length) {
memcpy(&transfer[total_rx], &payload[payload_index], rx_length);
total_rx += rx_length;
}
/* Increment 1 bit frame sequence number */
protocol->tail.toggle ^= true;
/* Is this the end of the transfer ?*/
if (rx_protocol.tail.eot) {
/* Return length of data received */
*in_out_transfer_length = total_rx;
break;
}
} while (!(timeout = timer_expired(timer)));
timer_free(timer);
return (!timeout && (rx_protocol.tail.sot
|| transfer_crc == crc16_signature(pdsdl->signature_crc16, total_rx, transfer))
? UavcanOk : UavcanError);
}
/****************************************************************************
* Name: uavcan_pack_GetNodeInfo_response
*
* Description:
* This function packs the data of a uavcan_NodeStatus_t into
* a uavcan_GetNodeInfo_response_t structure as array of bytes.
* Then it packs the uavcan_GetNodeInfo_response_t
*
* Input Parameters:
* response The uavcan_GetNodeInfo_response_t to be packed
* node_status - The uavcan_NodeStatus_t that is part of the composition
*
* Returned value:
* Number of bytes written.
*
****************************************************************************/
size_t uavcan_pack_GetNodeInfo_response(uavcan_GetNodeInfo_response_t *response)
{
size_t contiguous_length = FixedSizeGetNodeInfo + \
response->hardware_version.certificate_of_authenticity_length;
/*
* Move name so it's contiguous with the end of certificate_of_authenticity[length]
* which very well may be just after certificate_of_authenticity_length if the length
* of the certificate_of_authenticity is 0
*/
memcpy(&((uint8_t *)response)[contiguous_length], response->name, response->name_length);
return contiguous_length + response->name_length;
}
/****************************************************************************
* Name: uavcan_pack_LogMessage
*
* Description:
* This function formats the data of a uavcan_logmessage_t structure into
* an array of bytes.
*
* Input Parameters:
* external - The array of bytes to populate.
* internal - The uavcan_logmessage_t to pack into the data
*
* Returned value:
* Number of bytes written.
*
****************************************************************************/
static size_t uavcan_pack_LogMessage(uint8_t *external, const uavcan_LogMessage_t *internal)
{
/* Pack the 3 bit level in top bits followed by the length of source */
external[uavcan_byte_offset(LogMessage, level)] = uavcan_ppack(internal, LogMessage, level) \
| uavcan_pack(uavcan_byte_count(LogMessage, source), LogMessage, source_length);
memcpy(&external[uavcan_byte_offset(LogMessage, source)], internal->source,
PackedSizeMsgLogMessage - sizeof_member(uavcan_LogMessage_t, level));
return PackedSizeMsgLogMessage;
}
/****************************************************************************
* Name: uavcan_tx_log_message
*
* Description:
* This functions sends uavcan LogMessage type data. The Source will be
* taken from the application defined debug_log_source
*
* Input Parameters:
* level - Log Level of the LogMessage Constants DEBUG, INFO, WARN, ERROR
* stage - The Stage the application is at. see Aplication defined
* LOGMESSAGE_STAGE_x
* status - The status of that stage. See Application defined
* LOGMESSAGE_RESULT_x
*
* Returned Value:
* None
*
****************************************************************************/
void uavcan_tx_log_message(uavcan_LogMessageConsts_t level, uint8_t stage, uint8_t status)
{
static uint8_t transfer_id;
uavcan_LogMessage_t message;
uavcan_protocol_t protocol;
protocol.tail.transfer_id = transfer_id++;
const dsdl_t *dsdl = load_dsdl_protocol(DSDLMsgLogMessage, MessageOut, &protocol, 0);
message.level = level;
memcpy(&message.source, debug_log_source, sizeof(message.source));
message.text[0] = stage;
message.text[1] = status;
uint8_t payload[CanPayloadLength];
size_t frame_len = uavcan_pack_LogMessage(payload, &message);
uavcan_tx(&protocol, payload, frame_len, dsdl->mailbox);
}
/****************************************************************************
* Name: uavcan_tx_allocation_message
*
* Description:
* This function sends a uavcan allocation message.
*
* Input Parameters:
* requested_node_id - This node's preferred node id 0 for no preference.
* unique_id_length - This node's length of it's unique identifier.
* unique_id - A pointer to the bytes that represent unique
* identifier.
* unique_id_offset - The offset equal 0 or the number of bytes in the
* the last received message that matched the unique ID
* field.
* random - The value to use as the discriminator of the
* anonymous message
*
* Returned value:
* None
*
****************************************************************************/
void uavcan_tx_allocation_message(uint8_t requested_node_id, size_t unique_id_length, const uint8_t *unique_id,
uint8_t unique_id_offset, uint16_t random)
{
static uint8_t transfer_id;
uavcan_protocol_t protocol;
protocol.tail.transfer_id = transfer_id++;
const dsdl_t *dsdl = load_dsdl_protocol(DSDLMsgAllocation, MessageOut, &protocol, 0);
/* Override defaults */
protocol.ana.discriminator = random;
uint8_t payload[CanPayloadLength];
size_t max_copy = MAX_LENGTH_OF_UNIQUE_ID_IN_REQUEST;
size_t remaining = unique_id_length - unique_id_offset;
if (max_copy > remaining) {
max_copy = remaining;
}
payload[uavcan_byte_offset(Allocation, node_id)] = uavcan_pack(requested_node_id, Allocation, node_id) |
(unique_id_offset ? 0 : uavcan_bit_mask(Allocation, first_part_of_unique_id));
/*
* Copy in the remaining bytes of payload, either filling it
* or on the last chunk partially filling it
*/
memcpy(&payload[uavcan_byte_offset(Allocation, unique_id)], &unique_id[unique_id_offset], max_copy);
/* Account for the payload[0] */
max_copy++;
uavcan_tx(&protocol, payload, max_copy, dsdl->mailbox);
can_cancel_on_error(dsdl->mailbox);
}
/****************************************************************************
* Private Data - This table is positioned here to not mess up the line
* numbers for the debugger.
****************************************************************************/
#define NA 0
#define END_COMPONENTS
#define UAVCAN_DSDL_BIT_DEF(data_typ_name, field_name, lsb_pos, length, payload_offset, payload_length)
#define UAVCAN_DSDL_MESG_DEF(name, dtid, signature, packsize, mailbox, fifo, inbound, outbound) \
{ \
{\
.msg = \
{ \
.source_node_id = 0, \
.service_not_message = (false), \
.type_id = (dtid), \
.priority = 0, \
}, \
{ \
.tail_init = \
{ \
.u8 = (outbound), \
} \
} \
}, \
signature, \
inbound, \
outbound, \
mailbox, \
fifo, \
},
#define UAVCAN_DSDL_SREQ_DEF(name, dtid, signature, packsize, mailbox, fifo, inbound, outbound) \
{ \
{\
.ser = \
{ \
.source_node_id = 0, \
.service_not_message = (true), \
.dest_node_id = 0, \
.request_not_response = (true), \
.type_id = (dtid), \
.priority = 0, \
}, \
{ \
.tail_init = \
{ \
.u8 = (outbound), \
} \
} \
}, \
signature, \
inbound, \
outbound, \
mailbox, \
fifo, \
},
#define UAVCAN_DSDL_SRSP_DEF(name, dtid, signature, packsize, mailbox, fifo, inbound, outbound) \
{ \
{\
.ser = \
{ \
.source_node_id = 0, \
.service_not_message = (true), \
.dest_node_id = 0, \
.request_not_response = (false), \
.type_id = (dtid), \
.priority = 0, \
}, \
{ \
.tail_init = \
{ \
.u8 = (outbound), \
} \
} \
}, \
signature, \
inbound, \
outbound, \
mailbox, \
fifo, \
},
#define UAVCAN_DSDL_TYPE_DEF(name, dtid, signature, packsize, mailbox, fifo, inbound, outbound)
const dsdl_t dsdl_table[sizeDSDLTransfers] = {
#include "uavcan_dsdl_defs.h"
};
#undef UAVCAN_DSDL_TYPE_DEF
#undef UAVCAN_DSDL_SRSP_DEF
#undef UAVCAN_DSDL_SREQ_DEF
#undef UAVCAN_DSDL_MESG_DEF
#undef UAVCAN_DSDL_BIT_DEF
#undef FW_SERVER
#undef REQ_NODE
#undef THIS_NODE
#undef ANY_NODE_ID
#undef END_COMPONENTS
#undef NA