RFID read write doc

' Status/error return codes

ERR_OK CON $01 ' No errors

ERR_LIW CON $02 ' Did not find a listen window

ERR_NAK CON $03 ' Received a NAK, could be invalid command

ERR_NAK_OLDPW CON $04 ' Received a NAK sending old password (RFID_SetPass),

' could be incorrect password

ERR_NAK_NEWPW CON $05 ' Received a NAK sending new password (RFID_SetPass)

ERR_LIW_NEWPW CON $06 ' Did not find a listen window after sending

' old password (RFID_SetPass)

ERR_PARITY CON $07 ' Parity error when reading data

' -----[ Variables ]------------------------------------------------------------------

buf VAR Byte(12) ' data buffer

idx VAR Byte ' index

idy VAR Byte

' -----[ EEPROM Data ]----------------------------------------------------------------

' -----[ Initialization ]-------------------------------------------------------------

Initialize:

PAUSE 250 ' let DEBUG open

DEBUG CLS ' clear the screen

DEBUG "Parallax RFID Read/Write Module Test Application", CR,

"------------------------------------------------", CR, CR

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

Main:

DEBUG "Reading tag's unique serial number..."

Read_Tag:

SEROUT RFID_TX, Baud, ["!RW", RFID_Read, ADDR_Serial] ' Read tag's serial number

SERIN RFID_RX, Baud, [STR buf\5] ' Get status byte and data bytes

IF buf(0) <> ERR_OK THEN Read_Tag ' If we get an error, keep trying

' until the read is successful

FOR idx = 1 TO 4 ' Print data

DEBUG HEX2 buf(idx)

DEBUG CR

DEBUG "Writing and verifying data to tag..."

Write_Tag:

SEROUT RFID_TX, Baud, ["!RW", RFID_Write, 3, $FE, $ED, $BE, $EF] ' Write $FEEDBEEF

' into address 4 (user EEPROM area)

SERIN RFID_RX, Baud, [buf(0)] ' Wait for status byte

IF buf(0) <> ERR_OK THEN Write_Tag ' If we get an error, keep trying

' until the write is successful

DEBUG "Success!", CR

DEBUG "End of test.", CR

END

' -----[ End of File ]----------------------------------------------------