Rfid mfrc522

[frankko]

Hello everyone, there is' someone who has used the RFID reader with mfrc522 13.56 MHz in "spi" type electrodragon? I can not find an example in picbasic. There 's no one who can' help me with a simple example? Thanks!

[jrprogrammer]

Why don't you check out the Raspberry Pi forum or Google RFID with a Raspberry Pi. I have a Raspberry Pi working on SPI with several of the cheap readers. Note that all these readers are not created equal: some are poor clones (in respect to the antenna tuning) and the working range is 1/2 of others. The python files will show you the setup procedures.

[frankko]

Thanks for the reply. I would have liked to use a pic 16f688 or 18F452 series that already 'possess and maybe use as the basic language. the reader is 'model MF522-ED-AN module uses Philips MFRC522 original chip, purchased on electrodragon, link http://www.electrodragon.com/product/mifare-rc522-rfid-card-readerdetector-ic-card/ .

[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.8474

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

My test project:
8470

The RFID module (https://www.nxp.com/docs/en/data-sheet/MFRC522.pdf) I'm using is this one for ARDUINO and the connections I used:
8471

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]

8473

8472

[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.

[flotulopex]

Henrik,


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?

That's the point; I'm maybe even more confused than you are :biggrin:

Honestly, I don't know how to handle the card reader so I need some "theory" on how it works so I will be able to start thinking the right way.

[richard]

Here's a start. it reads and writes to the mfrc522.registers using the ssp module
I have made a demo for a 16f690 that loads up the regs [settings like in the Arduino demos ]
and reads them back. that bit is easy
I have not discovered how to read a card yet, the Arduino and python libs I have tried to
digest have code that's so obscure it leave me cold .

Arduino seems to poll CommIrqReg looking for a value of 0x45 [I think] but I have same regs set
but the card seems to be ignored , I'm just guessing how it works the reg never changes for me

reg printout for regs 1 to 3f


01,20 02,80 03,00 04,15 05,00 06,00 07,21 08,00
09,00 0A,00 0B,08 0C,10 0D,00 0E,A0 0F,00
10,00 11,3D 12,00 13,00 14,83 15,40 16,10
17,84 18,84 19,4D 1A,00 1B,00 1C,62 1D,00
1E,00 1F,EB 20,00 21,FF 22,FF 23,88 24,26
25,87 26,48 27,88 28,20 29,20 2A,8D 2B,A9
2C,00 2D,E8 2E,00 2F,00 30,00 31,00 32,00
33,80 34,00 35,00 36,40 37,92 38,00 39,00
3A,00 3B,88 3C,FF 3D,00 3E,03 3F,00

[HenrikOlsson]

Yeah, what we're dealing with here is not the interface to a "RFID-reader" but to the complete "RFID-radio". I have not looked at any example code for other platforms but I would expect it to be a fairly complicated setup procedure, configuring all the registers etc - and even more so KNOWING what to configure them with. And when Richard says HE cringes when looking at the code for it I don't think I'll even bother :-)

There are readers available implementing both the "radio" and a microcontroller giving you an interface to "just" the card and not the complete "radio" tranceiver - much easier but a bit more expensive. One example is the OEM/MIFARE ICODE board from IBTechnology (datasheet (http://www.ibtechnology.co.uk/wp-content/uploads/2016/06/OEM-MICODE-090811.pdf)) which I've personally used with success.

[flotulopex]

Here's a start.Thanks a lot Richard. But as you say, this is only a part of the problem...

Since I don't need nor want to go for rocket science, I'll take Henrik's advice and find a "plug'n play" reader ;)

[flotulopex]

...the OEM/MIFARE ICODE board from IBTechnology which I've personally used with success.

Hi Henrik,

I received my reader from IBTechnology a few days ago and I'm still stuck with even reading a tag. I must be overseeing something basic :frown:

Would you have snippet of code or even just some serial commands as a start for me please?

[HenrikOlsson]

I got payed to do that project so I'm afraid I can't just give the code away here.

What have you tried? Post some code, I or someone else might see what you're doing wrong.

As with any project, start small, get the basics going and build on it but try to think ahead.
If you think you're going to do this without reading the datasheet back to front a couple of times - think again.

I used SEROUT2/SERIN2 to communicate with the reader and HSEROUT/HSERIN to communicate with the PC.

You need to poll the CTS signal of the board to know when it's able to receive commands. So these are the very basics:
1) Wait for the CTS signal to high (board busy looking for a card)
2) Wait for the CTS signal to go low (board ready to receive serial data from the PIC)
3) Send the "return card status command" ($53)
4) Receive the card status byte from the reader.

Each bit in the Status byte indicates different things. See the datasheet!
If, for example, bit 2 is set then there's a card "on" the reader and you can then read the Unique Identifier

5) Wait for the CTS signal to high (board busy looking for a card)
6) Wait for the CTS signal to go low (board ready to receive serial data from the PIC)
7) Send the "read UID command" ($55)
8) Recieve 8 bytes depending on card type. First byte is status then comes the UID.

That's the basics. I highly recommend you get the first part going first. Make sure you can poll the reader and output the Status byte to the PC so you can SEE what it's doing - then move on.

/Henrik.

[flotulopex]

Thanks Henrik,


You need to poll the CTS signal of the board to know when it's able to receive commands. So these are the very basics:
1) Wait for the CTS signal to high (board busy looking for a card)
2) Wait for the CTS signal to go low (board ready to receive serial data from the PIC)
3) Send the "return card status command" ($53)
4) Receive the card status byte from the reader.
...

Up to now, I didn't made any code for a PIC. I'm trying to make it work via the Serial Communicator from MCS before I go THE step further on.

Since I bought the USB version of the board, I was assuming I would be able to, at least, read a Tag without any other connexion to the board. I'll have a look again what I need to do to get the CTS status.

[HenrikOlsson]

OK. I'm not 100% sure how the "PC interface" works on either the RS232 board (which is the one I have) or the USB board. But I suspect the interface is the same as the UART interface and if that's the case using the serial terminal might not be the right tool since you want to send and receive "raw" data while a terminal program such as the serial terminal is designed to send/receive ASCII. You CAN send "raw" data with it but when whatever it receives it tries to interpret as ASCII which probably won't work.

I know there auxillary data outputs which can be re-directed to various interfaces. Perhaps you need to reconfigure those in order to get it to output data to the "PC interface".

/Henrik.

[Dave]

Try using something like "LOOK232" as it can send ASCII or HEX data to your device as a packet.

[ShoKre]

Hi dear hobbyist and pros,
i ordered few cheap rfid boards with mfrc522 and first i try to communicate trough PC using UART
i found that if you want to use UART as first choice communication, you need to cut one line
on pcb and resolder it to gnd I2C and EA pin 1 and 32, actually just one other is already at gnd.

so if modified, it should be able to communicate with rs232 so i found Rc52xPcSerial.2.1.exe utility
very difficult to find, and it give something out, but not clear what is going on because utility is
complex, but already done for testing. I don't have time right now but my idea was to test it
in VB6 as all (old players) us who work on PBP are familiar with VB6, and there is a bit faster to
experiment an get live feedback then writing pic hundred times... once when it work on pc i can
rewrite code to PBP using 2 USART on 18f and that's solution for problem that i was planing, but
i have interrupt problem on my job, they never let me out from ISR so i have not time to play :(


edit:
as i read from few people which using it with arduino, it seams that initialization is needed
it has to activate RF section, and initialize communication RF parameters because at
boot time is disabled to not waste energy. that's reason why you don't read changed buffer when
you approach with card/badge