The following is tinyos-2.x/apps/tutorials/BlinkToRadio/BlinkToRadioC.nc from tinyos-2_0_devel-BRANCH. I found that it declares to use both AMPacket and Packet interfaces and actually it uses only Packet in the implementation. So is AMPacket redundant there?
Regards,
Haibin
// $Id: BlinkToRadioC.nc,v 1.1.2.2 2006/02/09 17:17:48 idgay Exp $
/*
* "Copyright (c) 2000-2006 The Regents of the University of California.
* All rights reserved.
*
* Permission to use, copy, modify, and distribute this software and its
* documentation for any purpose, without fee, and without written agreement is
* hereby granted, provided that the above copyright notice, the following
* two paragraphs and the author appear in all copies of this software.
*
* IN NO EVENT SHALL THE UNIVERSITY OF CALIFORNIA BE LIABLE TO ANY PARTY FOR
* DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES ARISING OUT
* OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF THE UNIVERSITY OF
* CALIFORNIA HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* THE UNIVERSITY OF CALIFORNIA SPECIFICALLY DISCLAIMS ANY WARRANTIES,
* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
* AND FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
* ON AN "AS IS" BASIS, AND THE UNIVERSITY OF CALIFORNIA HAS NO OBLIGATION TO
* PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS."
*
*/
/**
* Implementation of the BlinkToRadio application. A counter is
* incremented and a radio message is sent whenever a timer fires.
* Whenever a radio message is received, the three least significant
* bits of the counter in the message payload are displayed on the
* LEDs. Program two motes with this application. As long as they
* are both within range of each other, the LEDs on both will keep
* changing. If the LEDs on one (or both) of the nodes stops changing
* and hold steady, then that node is no longer receiving any messages
* from the other node.
*
* @author Prabal Dutta
* @date Feb 1, 2006
*/
#include <Timer.h>
#include "BlinkToRadio.h"
module BlinkToRadioC {
uses interface Boot;
uses interface Leds;
uses interface Timer<TMilli> as Timer0;
uses interface Packet;
uses interface AMPacket;
uses interface AMSend;
uses interface Receive;
uses interface SplitControl as AMControl;
}
implementation {
uint16_t counter;
message_t pkt;
bool busy = FALSE;
void setLeds(uint16_t val) {
if (val & 0x01)
call Leds.led0On();
else
call Leds.led0Off();
if (val & 0x02)
call Leds.led1On();
else
call Leds.led1Off ();
if (val & 0x04)
call Leds.led2On();
else
call Leds.led2Off();
}
event void Boot.booted() {
call AMControl.start();
}
event void AMControl.startDone (error_t err) {
if (err == SUCCESS) {
call Timer0.startPeriodic(TIMER_PERIOD_MILLI);
}
else {
call AMControl.start();
}
}
event void AMControl.stopDone(error_t err) {
}
event void Timer0.fired() {
counter++;
if (!busy) {
BlinkToRadioMsg* btrpkt =
(BlinkToRadioMsg*)(call Packet.getPayload(&pkt, NULL));
btrpkt->nodeid = TOS_NODE_ID;
btrpkt->counter = counter;
if (call AMSend.send(AM_BROADCAST_ADDR,
&pkt, sizeof(BlinkToRadioMsg)) == SUCCESS) {
busy = TRUE;
}
}
}
event void AMSend.sendDone(message_t* msg, error_t err) {
if (&pkt == msg) {
busy = FALSE;
}
}
event message_t* Receive.receive(message_t* msg, void* payload, uint8_t len){
if (len == sizeof(BlinkToRadioMsg)) {
BlinkToRadioMsg* btrpkt = (BlinkToRadioMsg*)payload;
setLeds(btrpkt->counter);
}
return msg;
}
}
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