Tinyos学习笔记（三）

读取Telosb内部传感器数据，并在计算机上显示。

senseC.nc代码如下：

 #include "Timer.h"
 #include "sense.h"
 #include "printf.h"

 module senseC
 {
     uses{
         interface Boot;
         interface Timer<TMilli>;//??????
         interface Read<uint16_t>;
         interface SplitControl;
         interface Packet;
         interface AMSend;
     }
 }
 implementation
 {
     bool busy=FALSE;
     message_t pkt;

     event void Boot.booted()
     {
         call SplitControl.start();
     }
     event void SplitControl.startDone(error_t err)
     {
         if(SUCCESS==err)
             call Timer.startPeriodic();
         else
             call SplitControl.start();
     }
     event void SplitControl.stopDone(error_t err){}

     event void Timer.fired()
     {
         call Read.read();
     }

     event void Read.readDone(error_t err,uint16_t data)
     {
         if(SUCCESS==err)
         {
             if(!busy)
             {
                 SenseMsg* tspkt=(SenseMsg*)(call Packet.getPayload(&pkt,sizeof(SenseMsg)));
                 if(NULL==tspkt)
                     return;
                 if (call Packet.maxPayloadLength() < sizeof(SenseMsg))
                     return;
                 tspkt->data=((float)data/*1.5-0.986)/0.0035;//(float)data*3/4096
                 if(call AMSend.send(AM_BROADCAST_ADDR,&pkt,sizeof(SenseMsg))==SUCCESS)
                     busy=TRUE;
                 //java net.tinyos.tools.PrintfClient -comm serial@/dev/ttyUSB0:telosb
                 printf("The current temperature is %u.\n",tspkt->data);
                 printfflush();
             }
         }
     }
     event void AMSend.sendDone(message_t* msg,error_t err)
     {
         if(msg==&pkt)
             busy=FALSE;
     }
 }

注意事项：

• 使用printf()须在Makefile中添加代码：CFLAGS += -I$(TOSDIR)/lib/printf
• 可用的内部传感器组件可在$(TOSDIR)/chips/msp430/sensors/中找到
• 由Read.readDone()得到的数据还需进一步的计算

下面我们由Java tools输出程序的结果：

1、java net.tinyos.tools.Listen -comm serial@/dev/ttyUSB0:telosb

2、java net.tinyos.tools.MsgReader -comm serial@/dev/ttyUSB0:telosb SenseMsg

3、java net.tinyos.tools.PrintfClient -comm serial@/dev/ttyUSB0:telosb

4、java net.tinyos.sf.SerialForwarder -comm serial@/dev/ttyUSB0:telosb