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oleoarruda
Joined: 07 Jan 2021
Posts: 1
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| I need a help |
 Posted: Thu Jan 07, 2021 12:28 pm |
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Hello everyone.
I'm having trouble reading MIFARE cards using the MFRC522 module.
I know where the problem is, but I don't know how to fix it.
I am able to communicate with the module via SPI. When I call the function to identify if there is a card, it transmits the 0x26 byte to the antenna and waits to receive a byte from the card. However, she is not receiving anything, even with the card next to the antenna.
Attached is the code for a part of the main. I didn't put the configuration pins, because I think everything is ok.
| Code: |
MFRC522_Init();
/*--------------- Loop embarcado ---------------*/
while (1)
{
UART_Write(0x11);
{
if( MFRC522_isCard( TagType ) )
UART_Write(0xCC);
if( MFRC522_ReadCardSerial( &UID ) )
{
//sprintf(texto,"%lu",codigo_rfid);// lo pasa a unsigned long
//LongIntToHex(codigo_rfid,texto);
UART_Write(0xAA);
}
}
|
Attached is the library code:
(The problem is in the MFRC522_ToCard function. After executing the command, it loops, counting 25 ms, waiting for a bit from the COMMIRQREG register to be set, indicating that a data has been received.
But even with the card, it receives nothing (the loop ends without setting the bit in the register)).
| Code: |
//conecci�n de modulo RFID usando SPI pot software
#include "SPI-Flash.h"
//MF522 Command word
#define PCD_IDLE 0x00 //NO action; Cancel the current command
#define PCD_AUTHENT 0x0E //Authentication Key
#define PCD_RECEIVE 0x08 //Receive Data
#define PCD_TRANSMIT 0x04 //Transmit data
#define PCD_TRANSCEIVE 0x0C //Transmit and receive data,
#define PCD_RESETPHASE 0x0F //Reset
#define PCD_CALCCRC 0x03 //CRC Calculate
// Mifare_One card command word
#define PICC_REQIDL 0x26 // find the antenna area does not enter hibernation
#define PICC_REQALL 0x52 // find all the cards antenna area
#define PICC_ANTICOLL 0x93 // anti-collision
#define PICC_SElECTTAG 0x93 // election card
#define PICC_AUTHENT1A 0x60 // authentication key A
#define PICC_AUTHENT1B 0x61 // authentication key B
#define PICC_READ 0x30 // Read Block
#define PICC_WRITE 0xA0 // write block
#define PICC_DECREMENT 0xC0 // debit
#define PICC_INCREMENT 0xC1 // recharge
#define PICC_RESTORE 0xC2 // transfer block data to the buffer
#define PICC_TRANSFER 0xB0 // save the data in the buffer
#define PICC_HALT 0x50 // Sleep
//And MF522 The error code is returned when communication
#define MI_OK 0
#define MI_NOTAGERR 1
#define MI_ERR 2
//------------------MFRC522 Register---------------
//Page 0:Command and Status
#define RESERVED00 0x00
#define COMMANDREG 0x01
#define COMMIENREG 0x02
#define DIVLENREG 0x03
#define COMMIRQREG 0x04
#define DIVIRQREG 0x05
#define ERRORREG 0x06
#define STATUS1REG 0x07
#define STATUS2REG 0x08
#define FIFODATAREG 0x09
#define FIFOLEVELREG 0x0A
#define WATERLEVELREG 0x0B
#define CONTROLREG 0x0C
#define BITFRAMINGREG 0x0D
#define COLLREG 0x0E
#define RESERVED01 0x0F
//PAGE 1:Command
#define RESERVED10 0x10
#define MODEREG 0x11
#define TXMODEREG 0x12
#define RXMODEREG 0x13
#define TXCONTROLREG 0x14
#define TXAUTOREG 0x15
#define TXSELREG 0x16
#define RXSELREG 0x17
#define RXTHRESHOLDREG 0x18
#define DEMODREG 0x19
#define RESERVED11 0x1A
#define RESERVED12 0x1B
#define MIFAREREG 0x1C
#define RESERVED13 0x1D
#define RESERVED14 0x1E
#define SERIALSPEEDREG 0x1F
//PAGE 2:CFG
#define RESERVED20 0x20
#define CRCRESULTREGM 0x21
#define CRCRESULTREGL 0x22
#define RESERVED21 0x23
#define MODWIDTHREG 0x24
#define RESERVED22 0x25
#define RFCFGREG 0x26
#define GSNREG 0x27
#define CWGSPREG 0x28
#define MODGSPREG 0x29
#define TMODEREG 0x2A
#define TPRESCALERREG 0x2B
#define TRELOADREGH 0x2C
#define TRELOADREGL 0x2D
#define TCOUNTERVALUEREGH 0x2E
#define TCOUNTERVALUEREGL 0x2F
//PAGE 3:TEST REGISTER
#define RESERVED30 0x30
#define TESTSEL1REG 0x31
#define TESTSEL2REG 0x32
#define TESTPINENREG 0x33
#define TESTPINVALUEREG 0x34
#define TESTBUSREG 0x35
#define AUTOTESTREG 0x36
#define VERSIONREG 0x37
#define ANALOGTESTREG 0x38
#define TESTDAC1REG 0x39
#define TESTDAC2REG 0x3A
#define TESTADCREG 0x3B
#define RESERVED31 0x3C
#define RESERVED32 0x3D
#define RESERVED33 0x3E
#define RESERVED34 0x3F
static void MFRC522_Wr( char addr, char value )
{
MFRC522_CS = 0;
SPI_Write( ( addr << 1 ) & 0x7E );
SPI_Write( value );
MFRC522_CS = 1;
}
static uint8_t MFRC522_Rd( char addr )
{
uint8_t value;
MFRC522_CS = 0;
SPI_Write( (( addr << 1 ) & 0x7E) | 0x80 );
value = SPI_Read();
MFRC522_CS = 1;
return value;
}
static void MFRC522_Clear_Bit( char addr, char mask )
{
MFRC522_Wr( addr, MFRC522_Rd( addr ) & (~mask) );
}
static void MFRC522_Set_Bit( char addr, char mask )
{
MFRC522_Wr( addr, MFRC522_Rd( addr ) | mask );
}
void MFRC522_Reset()
{
MFRC522_Wr( COMMANDREG, PCD_RESETPHASE );
}
void MFRC522_AntennaOn()
{
MFRC522_Set_Bit( TXCONTROLREG, 0x03 );
}
void MFRC522_AntennaOff()
{
MFRC522_Clear_Bit( TXCONTROLREG, 0x03 );
}
void MFRC522_Init()
{
MFRC522_CS_Direction = 0;
MFRC522_Rst_Direction = 0;
MFRC522_CS = 1;
MFRC522_Rst = 1;
MFRC522_Reset();
MFRC522_Wr( TMODEREG, 0x8D ); //Tauto=1; f(Timer) = 6.78MHz/TPreScaler
MFRC522_Wr( TPRESCALERREG, 0x3E ); //TModeReg[3..0] + TPrescalerReg
MFRC522_Wr( TRELOADREGL, 30 );
MFRC522_Wr( TRELOADREGH, 0 );
MFRC522_Wr( TXAUTOREG, 0x40 );
MFRC522_Wr( MODEREG, 0x3D );
// MFRC522_Wr( TMODEREG, 0x8D ); //Tauto=1; f(Timer) = 6.78MHz/TPreScaler
// MFRC522_Wr( TPRESCALERREG, 0x3E ); //TModeReg[3..0] + TPrescalerReg
// MFRC522_Wr( TRELOADREGL, 30 );
// MFRC522_Wr( TRELOADREGH, 0 );
// MFRC522_Wr( TXAUTOREG, 0x40 ); //100%ASK
// MFRC522_Wr( MODEREG, 0x3D ); // CRC valor inicial de 0x6363
//MFRC522_Clear_Bit( STATUS2REG, 0x08 );//MFCrypto1On=0
//MFRC522_Wr( RXSELREG, 0x86 ); //RxWait = RxSelReg[5..0]
//MFRC522_Wr( RFCFGREG, 0x7F ); //RxGain = 48dB
UART_Write(0x99);
MFRC522_AntennaOn();
MFRC522_Wr( RFCFGREG, 0x50 );
}
char MFRC522_ToCard( char command, char *sendData, char sendLen, char *backData, unsigned *backLen )
{
char _status = MI_ERR;
char irqEn = 0x00;
char waitIRq = 0x00;
char lastBits;
char n;
unsigned i;
switch (command)
{
case PCD_AUTHENT: //Certification cards close
{
irqEn = 0x12;
waitIRq = 0x10;
break;
}
case PCD_TRANSCEIVE: //Transmit FIFO data
{
irqEn = 0x77;
waitIRq = 0x30;
break;
}
default:
break;
}
MFRC522_Wr( COMMIENREG, irqEn | 0x80 );
MFRC522_Clear_Bit( COMMIRQREG, 0x80 );
MFRC522_Set_Bit( FIFOLEVELREG, 0x80 );
MFRC522_Wr( COMMANDREG, PCD_IDLE );
//Writing data to the FIFO
for ( i=0; i < sendLen; i++ )
{
MFRC522_Wr( FIFODATAREG, sendData[i] );
}
//Execute the command
MFRC522_Wr( COMMANDREG, command );
if (command == PCD_TRANSCEIVE )
{
MFRC522_Set_Bit( BITFRAMINGREG, 0x80 ); //StartSend=1,transmission of data starts
}
//UART_Write(MFRC522_Rd(FIFODATAREG));
//Waiting to receive data to complete
//i according to the clock frequency adjustment, the operator M1 card maximum waiting time 25ms???
i = 25;
do
{
__delay_ms(1);
//CommIrqReg[7..0]
//Set1 TxIRq RxIRq IdleIRq HiAlerIRq LoAlertIRq ErrIRq TimerIRq
n = MFRC522_Rd( COMMIRQREG );
i--;
}
while ( i && !(n & 0x01) && !( n & waitIRq ) );
MFRC522_Clear_Bit( BITFRAMINGREG, 0x80 ); //StartSend=0
UART_Write(MFRC522_Rd(RFCFGREG));
UART_Write(0x78);
UART_Write(MFRC522_Rd(STATUS2REG));
UART_Write(0x22);
UART_Write(i);
UART_Write(0x33);
UART_Write(n);
if (i != 0)
{
if (!(MFRC522_Rd(ERRORREG) & 0x1B)) //BufferOvfl Collerr CRCErr ProtecolErr
{
_status = MI_OK;
if (n & irqEn & 0x01)
{
_status = MI_NOTAGERR; //??
}
if (command == PCD_TRANSCEIVE)
{
n = MFRC522_Rd(FIFOLEVELREG);
lastBits = MFRC522_Rd(CONTROLREG) & 0x07;
if (lastBits)
{
*backLen = (n - 1) * 8 + lastBits;
}
else
{
*backLen = n * 8;
}
if (n == 0)
{
n = 1;
}
if (n > 16)
{
n = 16;
}
//Reading the received data in FIFO
for (i = 0; i < n; i++)
{
backData[i] = MFRC522_Rd(FIFODATAREG);
}
backData[i] = 0;
}
}
else
{
_status = MI_ERR;
}
}
//MFRC522_Set_Bit( CONTROLREG, 0x80 );
//MFRC522_Wr( COMMANDREG, PCD_IDLE );
return _status;
}
char MFRC522_Request(char reqMode, char *TagType)
{
char _status;
unsigned backBits; //The received data bits
MFRC522_Wr(BITFRAMINGREG, 0x07); //TxLastBists = BitFramingReg[2..0] ???
TagType[0] = reqMode;
_status = MFRC522_ToCard(PCD_TRANSCEIVE, TagType, 1, TagType, &backBits);
if ((_status != MI_OK) || (backBits != 0x10))
{
_status = MI_ERR;
}
return _status;
}
void MFRC522_CRC(char *dataIn, char length, char *dataOut)
{
char i, n;
MFRC522_Clear_Bit(DIVIRQREG, 0x04);
MFRC522_Set_Bit(FIFOLEVELREG, 0x80);
//Escreve dados no FIFO
for (i = 0; i < length; i++)
{
MFRC522_Wr(FIFODATAREG, *dataIn++);
}
MFRC522_Wr(COMMANDREG, PCD_CALCCRC);
i = 0xFF;
//Espera a finaliza��o do Calculo do CRC
do
{
n = MFRC522_Rd(DIVIRQREG);
i--;
} while (i && !(n & 0x04)); //CRCIrq = 1
dataOut[0] = MFRC522_Rd(CRCRESULTREGL);
dataOut[1] = MFRC522_Rd(CRCRESULTREGM);
}
char MFRC522_SelectTag(char *serNum)
{
char i;
char _status;
char size;
unsigned recvBits;
char buffer[9];
//MFRC522_Clear_Bit( STATUS2REG, 0x08 ); //MFCrypto1On=0
buffer[0] = PICC_SElECTTAG;
buffer[1] = 0x70;
for (i = 2; i < 7; i++)
{
buffer[i] = *serNum++;
}
MFRC522_CRC(buffer, 7, &buffer[7]);
_status = MFRC522_ToCard(PCD_TRANSCEIVE, buffer, 9, buffer, &recvBits);
if ((_status == MI_OK) && (recvBits == 0x18))
{
size = buffer[0];
}
else
{
size = 0;
}
return size;
}
//hibernation
void MFRC522_Halt()
{
unsigned unLen;
char buff[4];
buff[0] = PICC_HALT;
buff[1] = 0;
MFRC522_CRC( buff, 2, &buff[2] );
MFRC522_Clear_Bit( STATUS2REG, 0x80 );
MFRC522_ToCard( PCD_TRANSCEIVE, buff, 4, buff, &unLen );
MFRC522_Clear_Bit( STATUS2REG, 0x08 );
}
char MFRC522_Auth( char authMode, char BlockAddr, char *Sectorkey, char *serNum )
{
char _status;
unsigned recvBits;
char i;
char buff[12];
//Verify the command block address + sector + password + card serial number
buff[0] = authMode;
buff[1] = BlockAddr;
for ( i = 2; i < 8; i++ )
{
buff[i] = Sectorkey[i-2];
}
for ( i = 8; i < 12; i++ )
{
buff[i] = serNum[i-8];
}
_status = MFRC522_ToCard( PCD_AUTHENT, buff, 12, buff, &recvBits );
if ( ( _status != MI_OK ) || !( MFRC522_Rd( STATUS2REG ) & 0x08 ) )
{
_status = MI_ERR;
}
return _status;
}
char MFRC522_Write( char blockAddr, char *writeData )
{
char _status;
unsigned recvBits;
char i;
char buff[18];
buff[0] = PICC_WRITE;
buff[1] = blockAddr;
MFRC522_CRC( buff, 2, &buff[2] );
_status = MFRC522_ToCard( PCD_TRANSCEIVE, buff, 4, buff, &recvBits );
if ( (_status != MI_OK) || (recvBits != 4) || ( (buff[0] & 0x0F) != 0x0A) )
{
_status = MI_ERR;
}
if (_status == MI_OK)
{
for ( i = 0; i < 16; i++ ) //Data to the FIFO write 16Byte
{
buff[i] = writeData[i];
}
MFRC522_CRC( buff, 16, &buff[16] );
_status = MFRC522_ToCard( PCD_TRANSCEIVE, buff, 18, buff, &recvBits );
if ( (_status != MI_OK) || (recvBits != 4) || ( (buff[0] & 0x0F) != 0x0A ) )
{
_status = MI_ERR;
}
}
return _status;
}
char MFRC522_Read( char blockAddr, char *recvData )
{
char _status;
unsigned unLen;
recvData[0] = PICC_READ;
recvData[1] = blockAddr;
MFRC522_CRC( recvData, 2, &recvData[2] );
_status = MFRC522_ToCard( PCD_TRANSCEIVE, recvData, 4, recvData, &unLen );
if ( (_status != MI_OK) || (unLen != 0x90) )
{
_status = MI_ERR;
}
return _status;
}
char MFRC522_AntiColl( char *serNum )
{
char _status;
char i;
char serNumCheck = 0;
unsigned unLen;
MFRC522_Wr( BITFRAMINGREG, 0x00 ); //TxLastBists = BitFramingReg[2..0]
serNum[0] = PICC_ANTICOLL;
serNum[1] = 0x20;
MFRC522_Clear_Bit( STATUS2REG, 0x08 );
_status = MFRC522_ToCard( PCD_TRANSCEIVE, serNum, 2, serNum, &unLen );
if (_status == MI_OK)
{
for ( i=0; i < 4; i++ )
{
serNumCheck ^= serNum[i];
}
if ( serNumCheck != serNum[4] )
{
_status = MI_ERR;
}
}
return _status;
}
//0x0044 = Mifare_UltraLight
//0x0004 = Mifare_One (S50)
//0x0002 = Mifare_One (S70)
//0x0008 = Mifare_Pro (X)
//0x0344 = Mifare_DESFire
char MFRC522_isCard( char *TagType )
{
if (MFRC522_Request( PICC_REQALL, TagType ) == MI_OK)
return 1;
else
return 0;
}
char MFRC522_ReadCardSerial( char *str )
{
char _status;
_status = MFRC522_AntiColl( str );
str[5] = 0;
if (_status == MI_OK)
return 1;
else
return 0;
}
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umbertomori
Joined: 25 Feb 2021
Posts: 2
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| Verify presence tag |
| Posted: Thu Feb 25, 2021 4:28 am |
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Hi, i use RC522, but i have a problem for verify when there is presence of a tag on the antenna....
For verify the presence on the rfid, i use:
| Code: | unsigned char MFRC522_Request(unsigned char reqMode,unsigned char *TagType)
{
unsigned char status;
unsigned int16 backBits; //the data bits that received
Write_MFRC522(BitFramingReg,0x07); //TxLastBists = BitFramingReg[2..0]
TagType[0]=reqMode;
status=MFRC522_ToCard(PCD_TRANSCEIVE,TagType,1,TagType,&backBits);
if((status != MI_OK) || (backBits != 0x10)){status=MI_ERR;}
return status;
}
|
But the answer is 02,00,02,00,02,00 ecc.
When the tag is present, the answer must be always 02.
There is another mode for read the presence of the tag in rfid?
Thanks |
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Ttelmah
Joined: 11 Mar 2010
Posts: 19496
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| Posted: Thu Feb 25, 2021 8:51 am |
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Toggling like this is the standard response. You'll find lots of threads
online reporting this.
The way to test for a card is to do a read. If this returns an error, then
the card is not present. |
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umbertomori
Joined: 25 Feb 2021
Posts: 2
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| Posted: Fri Feb 26, 2021 6:40 am |
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| Ttelmah wrote: | Toggling like this is the standard response. You'll find lots of threads
online reporting this.
The way to test for a card is to do a read. If this returns an error, then
the card is not present. |
I have to be very quick in polling to understand if there is a card in the radio field ...
Can you help me for sequence of the command for verify the presence of the card? |
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vasiliok
Joined: 17 May 2011
Posts: 19
Location: Kaunas, Lithuania
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| Posted: Mon May 10, 2021 7:32 am |
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I have an interesting situation.
When I continiously reading RFID TAG it reads successfully every second time.
Anyone faced the same thing?
Or your reader reads TAG every time? Sure if TAG is near reader. |
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Ttelmah
Joined: 11 Mar 2010
Posts: 19496
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| Posted: Mon May 10, 2021 8:01 am |
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As I said: | Quote: |
Toggling like this is the standard response. You'll find lots of threads
online reporting this.
|
Alternate responses is what you do see if you repeatedly poll. |
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vasiliok
Joined: 17 May 2011
Posts: 19
Location: Kaunas, Lithuania
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| Posted: Mon May 10, 2021 8:24 am |
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| Ttelmah, ok! |
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Ttelmah
Joined: 11 Mar 2010
Posts: 19496
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| Posted: Mon May 10, 2021 11:42 pm |
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I think what happens is reading the poll, clears the bit, and it then takes a
'scan time' to re-trigger.
Personally if I want to find a tag is present, I always use the interrupt
output to know when a tag has entered the field. |
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vasiliok
Joined: 17 May 2011
Posts: 19
Location: Kaunas, Lithuania
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| Posted: Tue May 11, 2021 9:35 am |
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Thanks for reply and good ideas!
| Ttelmah wrote: | I think what happens is reading the poll, clears the bit, and it then takes a
'scan time' to re-trigger.
Personally if I want to find a tag is present, I always use the interrupt
output to know when a tag has entered the field. |
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