How to compare strings/array? RFID Project

[dan-tron]

No luck. I replaced the T2400 with 396 and it made no difference. I don't believe that the serial input is the problem because I can debug with a serial LCD and I can get it to print the actual RFID tag numbers on the LCD. The problem seems to lie under Check_List:. Specifically the line...
READ (tagNum - 1 * 10 + idx), char ' get tag data from table

I've never saved anything to EEPROM before. Maybe its not reading it correctly? Or saving it?

[Robson]

Can you post your complete code?
I have to understand what are you´re trying to do.

regards Rob

[dhouston]

You might try using WRITE to store the data. That might isolate the problem to your DATA or READ statements.

[Robson]

Maybe this one will help you.
I don´t try before working with SERIN2 but give it a try. You can change this part with storing data to eeprom too. It´s only to see how to realize that, if i´m not wrong.
To store data on eeprom use
DATA @$00,$D7,$7C,$4B,$02,$2D,$C9,$80,$3A,$C4,$72

Loop      VAR BYTE
ReadTag   VAR BYTE[2]
ConvTag   VAR WORD
Tag       VAR WORD[5]

Tag(1) = $D77C
Tag(2) = $4B02
Tag(3) = $2DC9
Tag(4) = $803A
Tag(5) = $C472

' -----[ Program Code ]----------------------------------------------------
Main:

LOW PORTB.3 ' activate the reader
SERIN2 PORTB.2, T2400, [WAIT($0A,"100050"), STR ReadTag\2]
HIGH PORTB.3 ' deactivate reader

Check_List:
ConvTag = ReadTag(0)*$100 + ReadTag(1)
FOR Loop = 1 to 5
    IF ConvTag = Tag(Loop) THEN Tag_found
NEXT Loop 
GOTO Bad_Char

Bad_Char: ' try next tag
'....
'....
GOTO main

Tag_Found:

[Bruce]

Are you sure you're programming your tag numbers in EEPROM at burn time? You should be
able to read back the .hex after programming to check.

[Robson]

Are you sure you're programming your tag numbers in EEPROM at burn time? You should be
able to read back the .hex after programming to check.

I don´t wrote the code before for storing on eeprom.

But maybe this could work

DATA @$00, $D7, $7C, $4B, $02, $2D, $C9, $80, $3A, $C4, $72

Loop    VAR BYTE
ReadTag VAR BYTE[2]
Tag     VAR WORD[5]
TmpTag  VAR BYTE[10]
ConvTag VAR WORD

' -----[ Program Code ]----------------------------------------------------

FOR Loop= 0 TO 9           ' Reading Data from EEprom Adr: $00 -$09
    READ Loop,TmpTag(Loop)
NEXT Loop

Main:

LOW PORTB.3 ' activate the reader
SERIN2 PORTB.2, T2400, [WAIT($0A,"100050"), STR ReadTag\2]
HIGH PORTB.3 ' deactivate reader

Check_List:

FOR Loop = 0 TO 8 STEP 2    ' Calculate Word from HighByte + LowByte
    Tag(Loop/2) = TmpTag(Loop)*$100+TmpTag(Loop+1)
NEXT Loop

ConvTag = ReadTag(0)*$100+ReadTag(1) ' Conversion of ReadTag to WORD

FOR Loop = 0 TO 4           ' Compare if ReadTag compares to Database in Eeprom
    IF ConvTag = Tag(Loop) THEN Tag_found
NEXT Loop
GOTO Bad_Char

Bad_Char: ' try next tag
'....
'....
GOTO main

Tag_Found:

Error corrected... Sorry

[dan-tron]

I have simplified my program to isolate the issue. I believe it lies with the READ command. This is my simplified code.

CMCON = 7   
DEFINE OSC 20

char            VAR     Byte                    ' character from table

' - LCD Stuff -
i con 254
clrlcd con 1
cgram con 64
ddram con 128
n96n con $4054
pause 1000
serout2 portb.7,n96n,[i,clrlcd]
pause 1

Tag1 DATA @$00,$10,$2A,$54,$FF,$7C

Main:

READ $02, char        ' get tag data from table

'Debug to LCD
serout2 portb.7,n96n,[i,clrlcd]
pause 500
serout2 portb.7,n96n,[i,ddram+0]
serout2 portb.7,n96n,[HEX char]
serout2 portb.7,n96n,[i,ddram+6]
serout2 portb.7,n96n,[DEC char]
pause 1000

end

At this point I am just trying to read a byte form the EEPROM and display it on the LCD just to prove it is being read. I see the EEPROM data in the EEPROM data window on my EPICWin programming software. So I guess it is writing the EEPROM data at burn time. However all I can debug on the LCD so far is just 0. This leads me to think that the problem is with the READ command. With the above example I would think that the LCD would display 2A or at least something other than just 0's.