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：

 1 #include "Timer.h"
 2 #include "sense.h"
 3 #include "printf.h"
 4 
 5 module senseC
 6 {
 7     uses{
 8         interface Boot;
 9         interface Timer<TMilli>;//??????
10         interface Read<uint16_t>;
11         interface SplitControl;
12         interface Packet;
13         interface AMSend;
14     }
15 }
16 implementation
17 {
18     bool busy=FALSE;
19     message_t pkt;
20 
21     event void Boot.booted()
22     {
23         call SplitControl.start();
24     }
25     event void SplitControl.startDone(error_t err)
26     {
27         if(SUCCESS==err)
28             call Timer.startPeriodic(500);
29         else
30             call SplitControl.start();
31     }
32     event void SplitControl.stopDone(error_t err){}
33 
34     event void Timer.fired()
35     {
36         call Read.read();
37     }
38     
39     event void Read.readDone(error_t err,uint16_t data)
40     {
41         if(SUCCESS==err)
42         {
43             if(!busy)
44             {
45                 SenseMsg* tspkt=(SenseMsg*)(call Packet.getPayload(&pkt,sizeof(SenseMsg)));
46                 if(NULL==tspkt)
47                     return;
48                 if (call Packet.maxPayloadLength() < sizeof(SenseMsg)) 
49                     return;
50                 tspkt->data=((float)data/4096*1.5-0.986)/0.0035;//(float)data*3/4096
51                 if(call AMSend.send(AM_BROADCAST_ADDR,&pkt,sizeof(SenseMsg))==SUCCESS)
52                     busy=TRUE;
53                 //java net.tinyos.tools.PrintfClient -comm serial@/dev/ttyUSB0:telosb
54                 printf("The current temperature is %u.\n",tspkt->data);
55                 printfflush();
56             }
57         }
58     }
59     event void AMSend.sendDone(message_t* msg,error_t err)
60     {
61         if(msg==&pkt)
62             busy=FALSE;
63     }
64 }

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