[Tinyos-help] Transmisison delay 32khz Timer precision in telosb mote
Dear everybody,
1. I'm implementing MAC protocol on tinyOS 2.1 and telosb mote. I use
AMSend/ActiveMessageC interface to send and receive messages. There is no
collision because only one node sends message to another node. I also
disable initial backoff by calling command call
SubBackoff.setCongestionBackoff(0) in async event void
SubBackoff.requestCongestionBackoff(message_t *msg) in CC2420CsmaP.nc
I measure the total transmission delay by calculating the time passed from
call send.send event to Send.senddone event (with ACK enable). The delay is
constant about 12 ms.
But my packet length is about 100 byte, so the delay may be about 100*8 /
250 kbps = 3.2 ms (plus ACK transmission delay). Why is the delay time so
long in my case? it might be CCA enabled. What is the delay time of CCA?
2. To disable CCA, I use setCca(FALSE) in CC2420CsmaP.nc as the Tep126
instruction
async event void SubBackoff.requestCca(message_t *msg) {
// Lower layers than this do not configure the CCA settings
RadioBackoff.setCca(FALSE)
signal RadioBackoff.requestCca(msg);
}
Is it correct or not?
3. I want to use CSMA with one kind of message and don't use CSMA with
another type of message. How can I do like this?
4. For timers, I see that TinyOS provides TMilli timer by default, but I
don't know how to use Timer with 32kHz precision. I can use LocalTime32kHz)
to get the current time with 32kHz precision.
// HilTimerMilliC component
configuration HilTimerMilliC
{
provides interface Init;
provides interface TimerTMilli as TimerMilli[ uint8_t num ];
provides interface LocalTimeTMilli;
}
How can I use Timer with 32kHz precision?
Thank you for any reply. I'm looking forward to your comments!
Best regards,
Bin
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Re: [Tinyos-help] help lesson 4 - The java class is not found: TestSerial
Hello everyone Thanks a lot to Michael, Varun, Janos, Andris and Prasanth for their quick responses. I finally get it.In fact, there were two problems. 1) My JNI files were not correctly installed. This was because : A) I had to modify the tos-install-jni file to change the uname and the group. * I obtained uname by typing $ uname in cygwin. For me it is CYGWIN_NT-6.1-WOW64. So at line 13 : [`uname` = Darwin] became [ `uname` = CYGWIN_NT-6.1-WOW64 ] * I obtained the group by typing $ id in cygwin. For me the gid is 513. So at line 16 and 29 : install --group=SYSTEM became install --group=513 B) tos-install-jni tried to access the directory C:\Program Files (x86)\Java\jdk1.7.0_03\jre\bin to install getenv.dll and toscomm.dll. However, in windows the directory were read-only. So, I changed permissions and tos-install-jni ran correctly. 2) I had to use the command java -classpath `cygpath -wp .:/cygdrive/c/cygwin/opt/tinyos-2.x/support/sdk/java/tinyos.jar` TestSerial to launch the application. Without the . it wasn't looking in the current directory even if I were in the directory. Best regards, Tifenn Prasanth P prasanthh...@gmail.com a écrit : Hi, I have faced the same problem and solved. One thing is you might not have compiled your java files. Go inside /tinyos-x.x/support/sdk/java folder and give command make. If that itself is not working try following (a) Download java tar file from the Tiny OS CVS repository: http://tinyos.cvs.sourceforge.net/viewvc/tinyos/tinyos-2.x/support/sdk/java/ (b) Untar and keep it in /opt/tinyos-2.1.0/support/sdk instead of existing java folder there. (c) Go inside the java folder in terminal and give make command. This is how i solved the issue. May be this will help you. On Tue, Mar 27, 2012 at 11:28 PM, Bíró, András andras.b...@unicomp.huwrote: Hi, I think the windows CLASSPATH format is different: It uses ; (semicolon) instead of : (colon), and \ (backslash) instead of / (slash). Andris On Tue, Mar 27, 2012 at 4:35 PM, tifenn.ra...@etu.utc.fr wrote: Dear all, I try to follow the tinyos-2.x tutorial in lesson 4: Mote-PC serial Communication. I successfully compiled and installed the TestSerial application on telosb mote. However, when I type in the TestSerial directory: java TestSerial I get: The java class is not found: TestSerial The current directory and the tinyos.jar are included in the CLASSPATH as it points to: .:C:/cygwin/opt/tinyos-2.x/support/sdk/java/tinyos.jar:C:/cygwin/opt/tinyos-2.x/support/sdk/java The TestSerial.class and TestSerialMsg.class were generated in the TestSerial directory. I am using Cygwin on Windows 7. I hope someone can help me. Thanks a lot in advance. Tifenn This message was sent using IMP, the Internet Messaging Program. ___ Tinyos-help mailing list Tinyos-help@millennium.berkeley.edu https://www.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help ___ Tinyos-help mailing list Tinyos-help@millennium.berkeley.edu https://www.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help -- Regards Prasanth.P This message was sent using IMP, the Internet Messaging Program. ___ Tinyos-help mailing list Tinyos-help@millennium.berkeley.edu https://www.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help
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Re: [Tinyos-help] Information about how to use Hash functions in NesC
nesC is a superset of C. So if you know how to work with hash functions in C then you should be golden. If that still doesn't make sense then you are out of luck and your question is beyond the scope of this list (its too basic, it's like how do I program such and such a function in C). On Fri, Apr 6, 2012 at 5:16 PM, abel freijo abel.fre...@gmail.com wrote: Hello, I'm new here, my name is Abel and I am a final year student of Computer Engineering, and my final degree project is related to sensor networks, so lately I'm looking for information about this issue. I am writing to you because I have a problem, I need to know how to apply Hash functions programming in nesC? I have read about the MessageDigest, HASH and MessageDigestInfo interfaces, but can not find information of their implementation. I'll be so thankful if you can help me with any information on the subject. Thank you in advance. Regards ___ Tinyos-help mailing list Tinyos-help@millennium.berkeley.edu https://www.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help -- Eric B. Decker Senior (over 50 :-) Researcher ___ Tinyos-help mailing list Tinyos-help@millennium.berkeley.edu https://www.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help
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