topic Re: MFRC522 in NFC

MFRC522

nedarj — Sun, 08 Apr 2018 07:06:42 GMT

hello

I have MFRC522 . I read datasheet and could Communicate with its registers with SPI interface in Atmel Studio but when I enable antenna and approach the tag No register changes, I checked it with Status2Reg register but just show IDLE.

I think that I must set correct frequency but I don't know how.

I put part of my programm .

status = PcdRequest( PICC_REQALL, buffer ) ;
       _delay_ms(100) ;
       str = MFRC522_read( Status2Reg ) ;
       if ( (str & 0x08) == 0x08 )
       {
           Lcd4_Clear() ;
           Lcd4_Write_String( "sMFCR" ) ;
           _delay_ms(100);
       }
       if ( (str & 0x01) == 0x01 )
       {
           Lcd4_Clear() ;
           Lcd4_Write_String( "startsend" ) ;
           _delay_ms(100);
       }
       if ((str & 0x02) == 0x02 )
       {
           Lcd4_Clear() ;
           Lcd4_Write_String( "Txwait") ;
           _delay_ms(100);
       }
       if ((str & 0x03) == 0x03)
       {
           Lcd4_Clear() ;
           Lcd4_Write_String( "Transmitting" ) ;
           _delay_ms(100);
       }
       if ((str & 0x06) == 0x06)
       {
           Lcd4_Clear() ;
           Lcd4_Write_String( "Recieving" ) ;
           _delay_ms(100);
       }
       if ((str & 0x07) == 0x00)
       {
           Lcd4_Clear();
           Lcd4_Write_String( "idle" ) ;
           _delay_ms(100);
       }

I don't know what must I do.

How can I correct it ?

Re: MFRC522

Kan_Li — Mon, 16 Apr 2018 01:30:29 GMT

Providing you want to read a Mifare Classic card, there are also other steps to do, for example, anticollision and select the card, and authentication so on, please kindly refer to https://www.nxp.com/docs/en/data-sheet/MF1S50YYX_V1.pdf for more details.

Hope that helps,

Have a great day,
Kan

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Re: MFRC522

nedarj — Mon, 30 Apr 2018 06:10:14 GMT

thank you but I read all of this datasheet but I can't Communicate with card.I changed my program but it didn't work .I attach my program please help me .

   MFRC522_HardReset ;
   _delay_ms(5) ;
   MFRC522_SoftReset();

    _delay_ms(5) ;

   // Reset baud rates
   MFRC522_write(TxModeReg, 0x00);
   MFRC522_write(RxModeReg, 0x00);
   // Reset ModWidthReg
   MFRC522_write(ModWidthReg, 0x26);

   MFRC522_write( TModeReg, 0x8D ) ;
   MFRC522_write( TPrescalerReg, 0x3E ) ;
   MFRC522_write( TReloadReg_H, 0x00 ) ;
   MFRC522_write( TReloadReg_L, 0x30 ) ;
   MFRC522_write( TxASKReg, 0x40 ) ;
   MFRC522_write( ModeReg, 0x3D ) ;

   SetBitMask( TxControlReg, 0x03 ) ;

    ClearBitMask( CollReg, 0x80 ) ;
   MFRC522_write( CommandReg, Idle_CMD) ;

     MFRC522_write( ComIrqReg, 0x7F) ;
   MFRC522_write( FIFOLevelReg, 0x80 ) ;
   MFRC522_write( FIFODataReg, PICC_REQALL ) ;

MFRC522_write( CommandReg, Transceive_CMD) ;
SetBitMask( BitFramingReg, 0x80 ) ;

     i = 600 ;
       do
       {
           n = MFRC522_read( ComIrqReg ) ;
           i-- ;
       }
       while ( (i!=0) && !(n&0x01) && !(n&0x30) ) ;

        ENABLE_CHIP() ;
       spi_masterInit() ;
       spi_masterTransmit( (( FIFODataReg<<1 ) & 0x7E) | 0x80 ) ;
       spi_slaveInit() ;
       for ( j = 0 ; j < 16 ; j++)
       {
           read[j] = spi_slaveRecieve() ;
       }
       DISABLE_CHIP() ;


       for ( a = 0 ; a < 4 ; a++)
       {
           USART_Transmit(read[a]) ;
       }