How do I compare value in memory to a string value

mre_rob

I have in memory, values loaded and I need to compare to a string. The line in purple never is true. Any help would be appreciated.....

<code>
dat
' THIS MUST BE HERE IN FRONT FOR ABSOLUTE ADDRESSING TO WORK!!!!!
SensorDatum
SensorData··· file "memorymap.txt"' padding used by the memory map
SensorDataPad byte 0,0,0,0
GPRMC········ byte "GPRMC",0
OBJ
· objVGA······· :"VGA_Text"
· objSerial···· :"SerialReceive"
· objMem······· :"GPSSensors_Lib"
CON
· _clkmode··············· = xtal1 + pll16x
· _xinfreq··············· = 5_000_000
· _crlf·················· = $0D
· _rxPin················· = 0
· _baud·················· = 4800
· _serMode··············· = 0
· _vgaPin················ = 16
con
· _sentenceSize = 256
· _serialBuffer = 256·································
VAR
· byte NmeaSentence[noparse][[/noparse]_sentenceSize]
· byte serialBuffer[noparse][[/noparse]_serialBuffer]
· long bootest
PUB Start
· 'bytefill(objMem#SensorDataAddress, 0, objMem#LastVar)
· objVGA.start(_vgaPin)
· objSerial.start(_rxPin,_baud,_serMode)
· repeat 4
··· GetSentence(@NmeaSentence)
··· GetHeader(@NmeaSentence)
··· if (long[noparse][[/noparse]constant(objMem#SensorDataAddress + objMem#head)]==GPRMC)
····· ParseGPRMC
··
PUB Stop
· objVGA.stop
· objSerial.stop
Pri ParseGPRMC
· objVGA.str(string("test: "))
· objVGA.out(_crlf)
Pri GetHeader(ptrSentence)
· byteMove(long[noparse][[/noparse]constant(objMem#SensorDataAddress + objMem#head)],ptrSentence,5)
·
Pri GetSentence(strPtr) | ptr, haveFoundDelimiter, rxChar, delimiter
· delimiter:="$"
· ptr:=0
· haveFoundDelimiter~
· bytefill(@serialBuffer,0,256)
· repeat while !haveFoundDelimiter
··· if (rxChar:=objSerial.rxcheck)=>0
····· if(rxChar==delimiter)···························
······· serialBuffer[noparse][[/noparse]ptr] :=· objSerial.rx······
······· ptr++·················································
······· repeat while ((serialBuffer[noparse][[/noparse]ptr-1] <> 13) and (serialBuffer[noparse][[/noparse]ptr-1] <> delimiter)) and (ptr < 255)·······
········· serialBuffer[noparse][[/noparse]ptr] :=· objSerial.rx··
········· ptr++
······· haveFoundDelimiter~~·····
· serialBuffer[noparse][[/noparse]ptr-1]:=0·······································
· byteMove(strPtr,@serialBuffer,256)·
</code>

Mike Green

There is a string compare built-in function in Spin. Look at the description of STRCOMP. This will compare two strings for equality. You pass it the starting addresses of two byte arrays (strings) that contain zero-terminated strings. They must be of the same length and contain the same byte values for the function to return TRUE.

mre_rob

Thanks Mike... I'll look at this method of comparing strings... I'm having the ptr vs var symbol issue again.....

M. K. Borri

Since you're comparing a small string that doesn't end where you want it to, what you could do is just check for "R" then "M" then "C" byte wise...

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http://forums.parallax.com/showthread.php?p=650217

meow, i have my own topic now? (sorta)

mre_rob

M. K. Borri said...
Since you're comparing a small string that doesn't end where you want it to, what you could do is just check for "R" then "M" then "C" byte wise...

Thanks.... Got your PM and implementing as we speak....