RFID read write doc

' ====================================================================================

' File...... rfid_rw_test.bs2

' Purpose... System-level test code for the Parallax RFID Read/Write Module

' Author.... Joe Grand, Grand Idea Studio, Inc. [www.grandideastudio.com]

' E-mail.... support@parallax.com

' Updated... 15 Dec 2009

' {$STAMP BS2}

' {$PBASIC 2.5}

' ====================================================================================

' -----[ Program Description ]--------------------------------------------------------

' This program performs a system-level test of the Parallax RFID Read/

' Write Module by:

' 1) Reading tag's unique ID

' 2) Writing and verifying a block of data to the tag

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

RFID_TX PIN 0 ' Connects to RFID R/W Module SIN

RFID_RX PIN 1 ' Connects to RFID R/W Module SOUT

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

#SELECT $STAMP

#CASE BS2, BS2E, BS2PE

T9600 CON 84

#CASE BS2SX, BS2P

T9600 CON 240

#ENDSELECT

Baud CON T9600

' RFID R/W Module Commands

' Number of bytes returned in ()

RFID_Read CON $01 ' Read data from specified address,

' valid locations 1 to 33 (5)

RFID_Write CON $02 ' Write data to specified address,

' valid locations 3 to 31 (1)

RFID_Login CON $03 ' Login to tag with password (1)

RFID_SetPass CON $04 ' Change tag's password from old to new (1)

RFID_Protect CON $05 ' Enable/disable password protection (1)

RFID_Reset CON $06 ' Reset tag (1)

RFID_ReadLegacy CON $0F ' Read unique ID from EM4102 read-only tag

' (for backwards compatibility with Parallax

' RFID Card Reader, #28140 and #28340) (12)

' Memory map/address locations for EM4x50 tag

' Each address holds/returns a 32-bit (4 byte) value

ADDR_Password CON 0 ' Password (not readable)

ADDR_Protect CON 1 ' Protection Word

ADDR_Control CON 2 ' Control Word

' ADDR 3-31 are User EEPROM area

ADDR_Serial CON 32 ' Device Serial Number

ADDR_DeviceID CON 33 ' Device Identification