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(500);
        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/4096*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.
",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