RFID Reader documentation v2.1

' -----[ I/O Definitions ]-------------------------------------------------

SYMBOL Enable = 0 ' low = reader on

SYMBOL RX = 1 ' serial from reader

SYMBOL Spkr = 2 ' speaker output

SYMBOL Latch = 3 ' lock/latch control

' -----[ Constants ]-------------------------------------------------------

SYMBOL LastTag = 2 ' 3 tags; 0 to 2

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

SYMBOL tag0 = B0 ' RFID bytes buffer

SYMBOL tag1 = B1

SYMBOL tag2 = B2

SYMBOL tag3 = B3

SYMBOL tag4 = B4

SYMBOL tag5 = B5

SYMBOL tag6 = B6

SYMBOL tag7 = B7

SYMBOL tag8 = B8

SYMBOL tag9 = B9

SYMBOL tagNum = B10 ' from EEPROM table

SYMBOL pntr = B11 ' pointer to char in table

SYMBOL char = B12 ' character from table

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

Tags:

EEPROM ("0F0184F20B") ' valid tags

EEPROM ("0F01D9D263")

EEPROM ("04129C1B43")

EEPROM ("0000000000") ' space for other tags

EEPROM ("0000000000")

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

Reset:

HIGH Enable ' turn of RFID reader

LOW Latch ' lock the door!

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

Main:

LOW Enable ' activate the reader

SERIN RX, T2400, ($0A) ' wait for header

SERIN RX, T2400, tag0, tag1, tag2, tag3, tag4 ' get tag bytes

SERIN RX, T2400, tag5, tag6, tag7, tag8, tag9

HIGH Enable ' deactivate reader

Check_List:

FOR tagNum = 0 TO LastTag ' scan through known tags

pntr = tagNum * 10 + 0 : READ pntr, char ' read char from DB

IF char <> tag0 THEN Bad_Char ' compare with tag data