[Tinyos-help] Error when receiving matrix values

Sindra Dk asma_192 at live.fr
Sat Apr 10 14:10:48 PDT 2010

thanks for your answer, i will try then i tell you if it works or not !!

From: sapojnik at gmail.com
Date: Sat, 10 Apr 2010 23:50:42 +0300
Subject: Re: [Tinyos-help] Error when receiving matrix values
To: asma_192 at live.fr
CC: tinyos-help at millennium.berkeley.edu

Although I still don't see the whole picture, I think that your problem is that you are using 8 bits for every element.
Now either it's 0:225 or -128 to +127.

So you probably have declared the struct that you send as int8_t[][] array.
Try to declare it as int16_t and don't forget that the default message payload size is 28 bytes.


On Sat, Apr 10, 2010 at 23:39, Sindra Dk <asma_192 at live.fr> wrote:

Hi all,im working on copression algorithm and i use TinyOS 2.xi send an image from PC to mote i decompressed it then when i resend it to PC

i get an error on its pixels value:

Original matrixuint8_t A[i][j]={{172,132,4,39},{23,127,5,4},{44,7,6,9},{77,211,19,5}};

$ java TestSerial -comm serial at com5:telosSending packet 0serial at com5:115200: resynchronisingSending packet 1Received packet sequence number 1l'affichage  est:-29  (wrong value)               

l'affichage  est:26l'affichage  est:-32l'affichage  est:-17l'affichage  est:-87  (wrong value)l'affichage  est:19l'affichage  est:-48

l'affichage  est:5l'affichage  est:77l'affichage  est:17l'affichage  est:72l'affichage  est:-18l'affichage  est:-118l'affichage  est:-4

l'affichage  est:85l'affichage  est:-8
***************************************Display matrix as C is: 227   (this is a true value)26

-32-17169.5  (this is a true value)19.5-48.55.5771772-18-118.5-4.585.5-8.5

i don't know why i can't display values higher than 127!!!can any one help me please? and thanks in advance.Ragards,Sindra 		 	   		  

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Arik Sapojnik

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