Mathscript Array -problem
Dear Friends,
I am reading the serial port data data , byte by byte..I used serial port vi and math-script in it ....
And these serial data are sent in a format like below........
format: HEADER , MSB , DATA , CHECKSUM..
I need to collect these bytes and plot it on the graph.. I have problem with saving these data in an array and processing it....
below is the code,which i had written to do the process
persistent ubIndex = 0
persistent bHeader = 0
ubTemp=input
if bHeader ==0
if ubTemp == 89
ubIndex= 0
bHeader = 1
end
else
ubIndex= ubIndex +1
ubReceivedata(ubIndex) = ubTemp
if ubIndex == 3
ubIndex = 0
bHeader = 0
end
end
ubChecksum = ubRecieveData(1) + ubRecieveData(2) + ubRecieveData(3)
if ubChecksum == 0
if ubRecieveData(1) == 76
duLen1 = ubRecieveData(2)
elseif ubRecieveData(1) == 69
duLen2 = ubRecieveData(2)
elseif ubRecieveData(1) == 78
duLen3 = ubRecieveData(2)
elseif ubRecieveData(1) == 71
duLen4 = ubRecieveData(2)
duLength = duLen1 * 16777216 + duLen2 * 65536 + uwLen3 * 256 + ubLen4
elseif ubRecieveData(1) == 80
uwTemp1 = ubRecieveData(2);
elseif ubRecieveData(1) == 66
ubTemp2 = ubRecieveData(2);
uwpackageSpeed = uwTemp1 * 256 + ubTemp2;
elseif ubRecieveData(1) == 68
uwTemp1 = ubRecieveData(2);
else ubRecieveData(1) == 65
ubTemp2 = ubRecieveData(2);
uwDrumSpeed = uwTemp1 * 256 + ubTemp2;
end
end
In the above program,i collected 2nd, 3rd,4th byte in the ubRecieveData array and i left the 1st byte(which is header)...
and I find the checksum by adding the 2nd,3rd,4th byte to find whether it is zero or not,
if it is zero ,then the received bytes are correct...and it will proceed to take only the data bytes...and i will plot it on the chart...
I have a doubt in the ubrecievedata array..whether it is collecting the 3 bytes data or not......whether array get's initliazed every time in the script..
since it doesn't get in to the if-loop checksum and loop further.....
I even removed the if-loop checksum ,to collect and process the data inside the loop below if-loop checksum..but it's not working ...
will the above script are correct..... .....?suggest some solutions to get working
i attached my program vi..for u to get feel of my problem...
regards
rajasekar
Attachments:
vjnewsamp.vi 319 KB
Hi Grant,
I did as u told u,still unable to process the data and plot it on the chart.....
I attached my program testing20.vi ....for finding the problem..
could u please see the vi..and suggest some solutions....
As u said the array should also be persistent.....and my doubt is the other variable like dulen1,dulen2,dulen3,dulen4,...should also be persistent...in order to calculate the parameter
duLength,.......similarly the parameter uwpackagespeed and uwdrumspeed should be persistent.(in my point of view....)
objective of the program is to read the serial port byte and byte ...and plotting it
And the byte are sent in format like
format: Header , MSB ,data,checksum..
Header, LSB ,data,checksum..
so i need to recogize this format in my mathscript node ...the main thing is ,...... in 4 bytes the data is only of 1byte....
In my program , i am plotting length(x-axis) versus packagespeed and drumspeed(y-axis)..
here the length parameter itself 4 byte of data.....i have to collect it byte by byte of data ,...from the 4 byte format(math script gets called 16 times to collect these 4 data bytes
from 4 byte format)... and packagespeed and drumspeed is of 2 byte.......
if u have any questions please ask me...
Eagerly awaiting for ur reply....
Regards
rajasekar
Attachments:
testing21.vi 442 KB
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sibojava
Message was edited by:
sibojavaDo you have several accounts?
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Attachments:
problem.vi 11 KBHi Christian,
here u are!
In the attached VI, just see how i am insertig new elements into an array
Use either Build array or insert into array
Use build arrays for large arrays with care, as it will load ur memory
Regards
Dev
Message Edited by devchander on 12-16-2005 03:24 AM
Message Edited by devchander on 12-16-2005 03:27 AM
Attachments:
problem[1].vi 31 KB
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