Rfid mfrc522

[metemoine]

There are cheap RFID modules that can read and write Mifare's tags and being sold at several web stores, like eBay and included with many "starter kits" nowadays. Simply search RFID-RC522 (MF-RC522).

[frankko]

hello metemoine,
thanks for the answer, as already' mentioned I would want a simple code in picbasic for the reading the kit's rfid mentioned here' above that it works with "spi."

[Demon]

Does anything here help?

http://melabs.com/samples/PBP-mixed/spimast.htm

I've never used SPI.

[frankko]

thanks for the indication Demon, I try to take a look.

[flotulopex]

Anyone did this?

[flotulopex]

Hi,

I might need a little help here - I'm stuck for hours now.

It's the first time for me to use this RFID module and it is giving me some headache.

For a test, I want to read the first three bytes of the tag's ID and print them serially out.

But up to now, I can't make the RFID module "read" something. I'm not sure about my connections and about the different timings and whatever I have to do to "start" the read process.

Does anyone have a good idea to get me started reading some data?

My test project:


The RFID module I'm using is this one for ARDUINO and the connections I used:


Here's is my current code:

' ====== FUSES =====================================================================================
' PIC 16F690 Fuses (MPASM)
@ __config _FCMEN_OFF &_IESO_OFF &_CPD_OFF &_WDT_OFF &_HS_OSC &_BOR_OFF &_CP_OFF &_PWRTE_OFF &_MCLRE_OFF

' ====== REGISTERS =================================================================================
'             76543210
OPTION_REG = %10000000 ' Pull-Ups OFF
OSCCON     = %00000000 ' Internal RC
ANSEL      = %00000000 ' Select analog inputs Channels 0 to 7
ANSELH     = %00000000 ' Select analog inputs Channels 8 to 11
WPUA       = %00000000 ' Select weak pull-ups
WPUB       = %00000000 ' Select weak pull-ups
ADCON0     = %00000000 ' Select the VP6 channel as ADC input bits5:2 (xx1101xx)
ADCON1     = %00000000 ' Set FRC
VRCON      = %00000000 ' VP6 reference
CM1CON0    = %00000000 ' Comparator1 Module
CM2CON0    = %00000000 ' Comparator2 Module
INTCON     = %00000000 ' INTerrupts CONtrol; GIE=1, T0IE=1
TRISA      = %00000000 ' Select Input/Output (0 to 5)
PORTA      = %00000000 ' Set High/Low (0 to 5)
TRISB      = %00000000 ' Select Input/Output (4 to 7)
PORTB      = %00100000 ' Set High/Low (4 to 7)
TRISC      = %00000000 ' Select Input/Output (0 to 7)
PORTC      = %00000000 ' Set High/Low (0 to 7)

' ====== DEFINES ===================================================================================
define OSC 4

' ====== VARIABLES & CONSTANTS =====================================================================
SPI_SCK     Var PORTB.4 ' SCK (SPI Clock)
SPI_MISO    Var PORTB.5 ' MISO (master In, Slave Out)
SPI_NSS     VAR PORTB.6 ' "NOT" Slave Select (SDA pin of module RC522)
LED         var PORTB.7
Serial_Out  VAR PORTC.7

SPI_Mode    var byte
RFIDData    Var byte(10)
Serial_Bdr  VAR word
Counter     var word

' ====== INITIALIZE ================================================================================
INIT:
Serial_Out  = 1 ' to avoid garbage serial data
Counter     = 0
SPI_NSS     = 1
SPI_Mode    = 0 ' MSBPRE
RFIDData    = 0
Serial_Bdr  = 84 '9600DTN

' ====== PROGRAM ===================================================================================
MAIN:
    ' Read RFID tag
    SPI_NSS = 0 ' select the RFID reader
    PAUSEus 50
    Shiftin SPI_MISO, SPI_SCK, SPI_Mode, [RFIDData(0),RFIDData(1),RFIDData(2)]
    SPI_NSS = 1 ' deselect the RFID reader
    
    ' Printout RFID data
    Counter = Counter + 1
    serout2 Serial_Out, Serial_Bdr,[DEC5(Counter), " ",DEC(RFIDData[0]),DEC(RFIDData[1]),DEC(RFIDData[2]),13,10]
    
    ' Alive witness
    TOGGLE LED 
    
    Pause 500
    Goto main:
 
End

'======= CIRCUITRY =================================================================================
'PORTA.0[19] ICSPDAT                  VDD >01-20< VSS/GND
'PORTA.1[18] ICSPCLK             OSC1/RA5 |02-19| RA0/AN0/DAT
'PORTA.2[17]                 AN3/OSC2/RA4 |03-18| RA1/AN1/CLK
'PORTA.3[04] MCLR                MCLR/RA3 >04-17| RA2/AN2
'PORTA.4[03] OSC2 - Xtal         CCP1/RC5 |05-16| RC0/AN4
'PORTA.5[02] OSC1 - Xtal          P1B/RC4 |06-15| RC1/AN5
'                             AN7/P1C/RC3 |07-14| RC2/AN6
'PORTB.4[13] SPI_SCK              AN8/RC6 |08-13| RB4/AN10
'PORTB.5[12] SPI_MISO             AN9/RC7 |09-12| RB5/AN11
'PORTB.6[11] SPI_NSS                  RB7 |10-11| RB6
'PORTB.7[10] LED
'
'PORTC.0[16]
'PORTC.1[15]
'PORTC.2[14]
'PORTC.3[07]
'PORTC.4[06]
'PORTC.5[05]
'PORTC.6[08]

[HenrikOlsson]

Hi Roger,
I'm confused, where do you see that shifiting in three bytes like that should give you the three first byte of a cards S/N number?

It looks to me as if the RFID reader chip implements a "proper" SPI slave meaning you have to shift data out at the same time as you shift data in. If that's the case SHIFTIN/SHIFTOUT won't work because it can only shift data out OR shift data in, it can't do it simultanously.

/Henrik.