Hi . with the help of radio message_t you can send 128 bytes of data at a time . But out of that 128 byte ..some bytes are reserved for some extra data which is not accessible to us. So around 117 bytes can be sent at a time . Initially that maximum limit is 28 as u said. You have to increase it . in message_t and your platform specific radio chip header file. As in my case (telosb) cc2240.h . There you will find TOSH_DATA_LENGTH . Change that field to whatever you want below 117 bytes . One more thing always compare length of data you are sending to maximum limit . Which can be found from call Send.maxPayloadLength() ;
cheers .. > > Date: Sun, 16 Aug 2009 21:30:25 -0400 > From: Akankshu Dhawan <[email protected]> > Subject: [Tinyos-help] message structure , large buffers ? > To: [email protected] > Message-ID: > <[email protected]> > Content-Type: text/plain; charset="iso-8859-1" > > Hi All > I am having some problem with the message_t structure. I am creating a > buffer size 1000 and as readStream.read(10) gets done in 0.01 sec. The > message_t TEP has informed me that the message payload can be of size 28 > bytes. But if my buffer size is 1000 I cannot send it through this message > structure. > 1. Will I have to break this buffer into small packets while sending ? In > case I have to do this will I need multiple buffers so that I do not loose > out on audio signals while I am busing sending ? How long does transmission > take on MICA2 motes ? > > > 2. Is there any other way to transmit large buffers ? > > I am looking at Anti Theft application as well since it is using ReadStream > for the acceleration components and that has been really useful but even > that application has used buffer size of 10 which was similar to > Oscilloscope. 2 bytes per buffer element means I can have a maximum of 14 > elements in my buffer. Is my judgement true ? > > > > Looking forward to hearing from you. > > > Thanks > Akankshu > > -- > First they ignore you, then they laugh at you, then they fight you, then > you > win. > - Mahatma Gandhi > -------------- next part -------------- > An HTML attachment was scrubbed... > URL: > https://www.millennium.berkeley.edu/pipermail/tinyos-help/attachments/20090816/ae77124a/attachment-0001.htm > > ------------------------------ > -- With Best Regards Himanshu Barve M.Tech Electrical Engineering (Power System) IIT Kharagpur , West Bengal , India Ph: - +91 9775201181
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