Hello all,
I am trying to read data directly from the serial port, using Matlab and the
Basestation tinyos program. When I use the "java net.tinyos.tools.Listen"
program, it appears that all my packet data is being received by the
basestation correctly. However, I would like to read the data directly into
matlab. I am attempting to use the following matlab code to read 10
packets.
********************************************************
s = serial('/dev/ttyUSB0','BaudRate',115200);
fopen(s);
counter = 0;
while(counter<10)
if (s.BytesAvailable > PACKETSIZE)
packet = fread(s,PACKETSIZE)
counter = counter+1;
end
end
*********************************************************
Now, the problem that I am having is that the alignment of each packet
coming in can be different. For example, if I know the 3rd byte is the node
ID, I try to read the 3rd byte. This shifts around though, so I can't parse
the data consistently. I think it is happening whenever a packet is
corrupted/dropped over the radio. Does the basestation program do something
to compensate for corrupted packets that I am not taking into account in my
matlab code?
Is there a better way to read the serial data directly into matlab without
having these parsing issues? Any help is appreciated. Thanks.
-Joey
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