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
|
/* -*- mode:c++; indent-tabs-mode: nil -*-
* Copyright (c) 2004, Technische Universitaet Berlin
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* - Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* - 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.
* - Neither the name of the Technische Universitaet Berlin 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.
*
* - Revision -------------------------------------------------------------
* $Revision: 1.9 $
* $Date: 2010-01-27 14:42:10 $
* ========================================================================
*/
#include "crc.h"
#include "message.h"
#include "radiopacketfunctions.h"
/**
* This module in conjunction with the UartPhyC turns byte streams
* into packtes.
*
* @see UartPhyC
*
* @author Kevin Klues <klues@tkn.tu-berlin.de>
* @author Philipp Huppertz <huppertz@tkn.tu-berlin.de>
*/
module PacketSerializerP {
provides {
interface PhySend;
interface PhyReceive;
interface Packet;
interface RadioTimeStamping;
}
uses {
interface RadioByteComm;
interface PhyPacketTx;
interface PhyPacketRx;
#ifdef PACKETSERIALIZER_DEBUG
interface SerialDebug;
#endif
}
}
implementation {
#ifdef PACKETSERIALIZER_DEBUG
void sdDebug(uint16_t p) {
call SerialDebug.putPlace(p);
}
#else
void sdDebug(uint16_t p) {};
#endif
/* Module Global Variables */
message_t rxMsg; // rx message buffer
message_t *rxBufPtr = &rxMsg; // pointer to rx buffer
message_t *txBufPtr = NULL; // pointer to tx buffer
uint16_t crc = 0; // CRC value of either the current incoming or outgoing packet
uint8_t byteCnt = 0; // index into current datapacket
/* Local Function Declarations */
void TransmitNextByte();
void ReceiveNextByte(uint8_t data);
typedef enum {
SFD_OFFSET = sizeof(message_header_t) - sizeof(message_radio_header_t) + 2
} pserializer_constants_t;
/*- Radio Send */
async command error_t PhySend.send(message_t* msg, uint8_t len) {
atomic {
crc = 0;
txBufPtr = msg;
// assume "right (LSB) aligned" unions -- highly compiler and platform specific
byteCnt = sizeof(message_header_t) - sizeof(message_radio_header_t);
getHeader(msg)->length = len;
sdDebug(4000 + getHeader(msg)->token);
}
call PhyPacketTx.sendHeader();
return SUCCESS;
}
async event void PhyPacketTx.sendHeaderDone() {
TransmitNextByte();
}
async event void RadioByteComm.txByteReady(error_t error) {
if(error == SUCCESS) {
TransmitNextByte();
} else {
signal PhySend.sendDone(txBufPtr, FAIL);
}
}
void TransmitNextByte() {
if(byteCnt < sizeof(message_header_t) + getHeader(txBufPtr)->length) {
// transmit the data part
uint8_t* buf = (uint8_t *)(txBufPtr);
crc = crcByte(crc, buf[byteCnt]);
call RadioByteComm.txByte(buf[byteCnt]);
byteCnt++;
if(byteCnt == SFD_OFFSET) {
signal RadioTimeStamping.transmittedSFD(0, txBufPtr);
}
}
else if(byteCnt == sizeof(message_header_t) + getHeader(txBufPtr)->length) {
call RadioByteComm.txByte(crc);
byteCnt++;
}
else if(byteCnt == sizeof(message_header_t) + getHeader(txBufPtr)->length + 1) {
call RadioByteComm.txByte(crc >> 8);
byteCnt++;
}
else {
call PhyPacketTx.sendFooter();
}
}
async event void PhyPacketTx.sendFooterDone() {
sdDebug(6000 + getHeader(txBufPtr)->token);
signal PhySend.sendDone((message_t*)txBufPtr, SUCCESS);
}
/* Radio Receive */
async event void PhyPacketRx.recvHeaderDone(error_t error) {
if(error == SUCCESS) {
byteCnt = sizeof(message_header_t) - sizeof(message_radio_header_t);
getHeader(rxBufPtr)->length = sizeof(message_radio_header_t);
crc = 0;
signal PhyReceive.receiveDetected();
}
}
async event void RadioByteComm.rxByteReady(uint8_t data) {
ReceiveNextByte(data);
}
async event void PhyPacketRx.recvFooterDone(error_t error) {
// we care about wrong crc in this layer
if(!getFooter(rxBufPtr)->crc) {
error = FAIL;
}
else {
}
byteCnt = 0;
rxBufPtr = signal PhyReceive.receiveDone(rxBufPtr, rxBufPtr->data, getHeader(rxBufPtr)->length, error);
}
/* Receive the next Byte from the USART */
void ReceiveNextByte(uint8_t data) {
uint8_t* buf = (uint8_t *)(rxBufPtr);
buf[byteCnt++] = data;
if(byteCnt <= sizeof(message_header_t) + getHeader(rxBufPtr)->length) {
crc = crcByte(crc, data);
if(byteCnt == SFD_OFFSET) {
signal RadioTimeStamping.receivedSFD(0);
}
else if(byteCnt == sizeof(message_header_t) + getHeader(rxBufPtr)->length) {
byteCnt = offsetof(message_t, footer) + offsetof(message_radio_footer_t, crc);
}
if(getHeader(rxBufPtr)->length > TOSH_DATA_LENGTH) {
getFooter(rxBufPtr)->crc = 0;
call PhyPacketRx.recvFooter();
}
}
else if(byteCnt >= offsetof(message_t, footer) + offsetof(message_radio_footer_t, crc) + sizeof(crc)) {
message_radio_footer_t* footer = getFooter(rxBufPtr);
footer->crc = (footer->crc == crc);
call PhyPacketRx.recvFooter();
sdDebug(5000 + getHeader(rxBufPtr)->token);
}
}
/* Packet interface */
command void Packet.clear(message_t* msg) {
memset(msg, 0, sizeof(message_t));
}
command uint8_t Packet.payloadLength(message_t* msg) {
return (getHeader(msg))->length;
}
command void Packet.setPayloadLength(message_t* msg, uint8_t len) {
getHeader(msg)->length = len;
}
command uint8_t Packet.maxPayloadLength() {
return TOSH_DATA_LENGTH;
}
command void* Packet.getPayload(message_t* msg, uint8_t len) {
if (len <= TOSH_DATA_LENGTH) {
return (void*)msg->data;
}
else {
return NULL;
}
}
// Default events for radio send/receive coordinators do nothing.
// Be very careful using these, or you'll break the stack.
default async event void RadioTimeStamping.transmittedSFD(uint16_t time, message_t* msgBuff) { }
default async event void RadioTimeStamping.receivedSFD(uint16_t time) { }
}
|
