RFID MF522 – AN and PIC 18F4550

[Everson]

Hi friends, 

 

I’m trying to create a project that can read the RFID card. 

 

I’m using this RFID module: MF522-AN that is connected like this.

 

 

PINS that I’m using on PIC:

 

SS – PIN_B2 (Just to send high or low)

SCK – PIN_B1

MISO – PIN_C7

MOSI – PIN_B0

 

Today I have connected using serial, just to send de computer information. The serial is OK, function normally. 

But when I get the card and approach the RFID module does not nothing. ( The thing strange is that when I approach the hand on wire, PIC read something but just crazy characters.

 

This is my code that I’m using in CCS compiler.

 

#include <18F4550.h>

#device adc=8

 

#define SPI_MODE_0  (SPI_L_TO_H | SPI_XMIT_L_TO_H) 

#define SPI_MODE_1  (SPI_L_TO_H) 

#define SPI_MODE_2  (SPI_H_TO_L) 

#define SPI_MODE_3  (SPI_H_TO_L | SPI_XMIT_L_TO_H) 

 

#define CS   PIN_B2  

#define SCK  PIN_B1  

#define SDO  PIN_C7  

#define SDI  PIN_B0   

 

#use delay (clock=48000000) 

#use rs232(baud=9600,xmit=PIN_C6,rcv=PIN_C7,stop=1,parity=N, bits =  

 

#use SPI(SLAVE, BITS=8, BAUD=9600, DO = SDI, DI = SDO, CLK = SCK, ENABLE=CS, MSB_FIRST, stream = RFID, ENABLE_ACTIVE=1)

 

#FUSES HSPLL ,PLL5, CPUDIV1, USBDIV VREGEN, ICPRT, NOWDT, NOBROWNOUT, NOPROTECT 

 

void main()

{

setup_comparator(NC_NC_NC_NC);

int i=0;

char value[8]=”n”;

char x0;

int16 result;

int8 res;

 

printf(“Iniciando…”);

 

while(TRUE)

{

 

output_high(pin_C2);

delay_ms(100);

 

output_low(pin_B2);

 

for(i=0;i<8;i++){

value=SPI_XFER(RFID, 0x32);

 

printf(“Informacao: %cnr”,value); 

 

//value = spi_xfer(RFID, 0b10000000); 

}

 

printf(“Geral: %cnr”,value); 

 

output_high(pin_B2);

 

output_low(pin_C2); 

delay_ms(300);

 

}

 

}

 

I tried a lot of BAUD RATE, change the pins of MISO and MOSI. I did all things but nothing happen.

 

Can someone help me? It is a final project.

 

[AJISH ALFRED]

Hi,

 

“Today I have connected using serial, just to send de computer information”, How you did this exactly?

[Everson]

Hi.

 

I´m using the MAX232 to send information to PC.

 

I  have already had hardware implemented on my protoboard, and I just used it to communicate. I know that I could use the USB of 18F4550.

 

Like you see on my code, there is a directive to using the serial.

#use rs232(baud=9600,xmit=PIN_C6,rcv=PIN_C7,stop=1,parity=N, bits =

 

What I would like is communicate the MF522 using SPI. But nothing happen.

 

Thanks for now.

[Everson]

Hi Friends.

 

Is there anyone that can help me?

 

I don’t know if can be the module that uses 3.3v or the PIC that use 5v.

Maybe I need to put the MISO of module in RX of MAX232 to do the conversion of 3.3v to 5v.

Anyone has some idea to do it?

 

Thanks.

[AJISH ALFRED]

Ya, that voltage difference need to be taken care of. The max232 is no the right device for this. There are 3v – 5v bidirectional level shifter ics and modules available.

[AJISH ALFRED]

This project 

http://www.engineersgarage.com/embedded/avr-microcontroller-projects/sd-card-interfacing-project

mention such a device.

[Author]

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