无线传感器实验二报告.docx

浙江工业大学计算机学院实 验 报 告实验名称 无线传感网络实验之丢包率检测日 期 2014年12月30日 一、 实验内容 本次实验主要是通过代码的编写测试节点的发送功率和距离的远近对接收节点的丢包率的影响。对发送功率的设置是通过修改CC2420.h文件中的参数实现的。其中距离的远近的调节是容易实现的。而对丢包率的计算是由接收节点的主机B将收到的数据包打印到屏幕上，主机A烧写的节点则是实现每次发送100个数据包。二、程序源代码主机A（发送方） BlinkToRadio.h#ifndef BLINKTORADIO_H#define BLINKTORADIO_Henum AM_BLINKTORADIO = 6, TIMER_PERIOD_MILLI = 250;typedef nx_struct BlinkToRadioMsg nx_uint16_t nodeid; nx_uint16_t counter; BlinkToRadioMsg;#endif BlinkToRadioAppC.nc#include #include BlinkToRadio.hconfiguration BlinkToRadioAppC implementation components MainC; components LedsC; components BlinkToRadioC as App; components new TimerMilliC() as Timer0; components ActiveMessageC; components new AMSenderC(AM_BLINKTORADIO); components new AMReceiverC(AM_BLINKTORADIO); App.Boot - MainC; App.Leds - LedsC; App.Timer0 - Timer0; App.Packet - AMSenderC; App.AMPacket - AMSenderC; App.AMControl - ActiveMessageC; App.AMSend - AMSenderC; App.Receive - AMReceiverC; BlinkToRadioC.nc#include #include BlinkToRadio.hmodule BlinkToRadioC uses interface Boot; uses interface Leds; uses interface Timer 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+;/发送100个数据包 if(counter nodeid = 10; 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; MakefileCOMPONENT=BlinkToRadioAppCinclude $(MAKERULES)主机B（接收方） BlinkToRadio.h#ifndef BLINKTORADIO_H#define BLINKTORADIO_Henum AM_BLINKTORADIO = 6, TIMER_PERIOD_MILLI = 250;typedef nx_struct BlinkToRadioMsg nx_uint16_t nodeid; nx_uint16_t counter; BlinkToRadioMsg;#endif BlinkToRadioAppC.nc#include #include BlinkToRadio.hconfiguration BlinkToRadioAppC implementation components MainC; components LedsC; components BlinkToRadioC as App; components new TimerMilliC() as Timer0; components ActiveMessageC; components new AMSenderC(AM_BLINKTORADIO); components new AMReceiverC(AM_BLINKTORADIO); App.Boot - MainC; App.Leds - LedsC; App.Timer0 - Timer0; App.Packet - AMSenderC; App.AMPacket - AMSenderC; App.AMControl - ActiveMessageC; App.AMSend - AMSenderC; App.Receive - AMReceiverC; BlinkToRadioC.nc#include #include BlinkToRadio.h#include printf.hmodule BlinkToRadioC uses interface Boot; uses interface Leds; uses interface Timer as Timer0; uses interface Packet; uses interface AMPacket; uses interface AMSend; uses interface Receive; uses interface SplitControl as AMControl;implementation uint16_t counter; message_t pkt; bool busy = FALSE; uint32_t nowtime; uint16_t Number=0; event void Boot.booted() call AMControl.start(); event void AMControl.startDone(error_t err) if (err = SUCCESS) else call AMControl.start(); event void AMControl.stopDone(error_t err) event void Timer0.fired() printf(now is:%dn,(call Timer0.getNow();printfflush(); call Leds.led0Toggle(); event void AMSend.sendDone(message_t* msg, error_t err) if (&pkt = msg) busy = FALSE; event message_t* Receive.receive(message_t* msg, void* payload, uint8_t len) if (len = sizeof(BlinkToRadioMsg) BlinkToRadioMsg* btrpkt = (BlinkToRadioMsg*)payload; if(btrpkt-nodeid=10) /= if (!busy) call Leds.led2Toggle(); Number+; printf(No.%d pakage is received,the number:%dn,btrpkt-counter,Number); printfflush(); if (call AMSend.send(AM_BROADCAST_ADDR, &pkt, sizeof(BlinkToRadioMsg) = SUCCESS) busy = TRUE; return msg; MakefileCOMPONENT=BlinkToRadioAppCCFLAGS += -I$(TOSDIR)/lib/printfinclude $(MAKERULES)三、实验步骤1.在实验四的代码基础上，修改BlinkToRadioC.nc中的事件Timer0.fired()和事件Receive.receive中收到数据包后输出对应的信息。2. 在cygwin中进行编译并烧写节点，进行测试。3.开始时，设置发送节点的功率为3，不断拉大两个节点之间的距离，这时就算把接收节点拿到实验室最远的地方，大概有10米的距离还是能做到完全接收到所有发送节点发送的数据（这个截图忘了）。4.将发送节点的功率设为1，在近距离的时候，接收节点能做到完全接收到所有发送节点发送的数据。当距离在超过1米时，开始明显得丢包了。四、实验截图主机B（接收方）:功率为1，距离1米时，接收到了90个包，共发送了100个包，所以这个时候的丢包率为 90%功率为1，距离为3米左右的时候测得丢包率，这个时候可以看到只接收到了17个数据包，可以看出丢掉的数据包已经很多了。这个时候的丢包率为：17%五、实验总结 本次实验的关键还是在代码编写，在实验四的框架下，还是比较容易实现的。为了测试丢包率，就一定要知道发送方发送的节点数，和对应的接收方接收的节点数。这里我们为了方便计算，就让发送节点按照一秒发送4个数据包的速率一次性发