AS3955 datasheet(88/111 Pages) AMSCO

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[v1-01] 2015-Apr-29

AS3955 − Application Information

break;

case 0x30: // T2T read

case 0xA2: // T2T write

case 0xC2: // T2T sector select

case 0x60: // AS3955 GET_VERSION

break;

default:

//unexpected frame, send the tag to SLEEP/SENSE state

err = as3955DirectCommand(0xD2);

break;

}

Further, the MCU should implement the ISO14443A-4 block

transmission protocol; Select, ReadBinary and UpdateBinary

commands from ISO/IEC 7816-4.

ISO14443A-4 block transmission protocol

#define ISO14443_4_PCB_I

0x02

/*!< ISO14443_4 Data Link Layer Head-er I-block. */

#define ISO14443_4_PCB_I_MASK

0xC6

/*!< ISO14443_4 I-block Header Mask, NAD not supported. */

// added the RFU for the EMVco tests

#define ISO14443_4_PCB_I_CHAINING

0x10

/*!< ISO14443_4 I-block chaining bit. */

#define ISO14443_4_PCB_R

0xa2

/*!< ISO14443_4 Data Link Layer Head-er R-block. */

#define ISO14443_4_PCB_RACK

ISO14443_4_PCB_R

/*!< ISO14443_4 Data Link Layer R(ACK) */

#define ISO14443_4_PCB_R_MASK

0xe6

/*!< ISO14443_4 R-block Header Mask */

#define ISO14443_4_PCB_R_NAK_BIT

0x10

/*!< ISO14443_4 R-block NAK bit */

#define ISO14443_4_PCB_S

0xc0

/*!< ISO14443_4 Data Link Layer Head-er S-block. */

#define ISO14443_4_PCB_S_WTX_MASK 0xf2

/*!< ISO14443_4 S-block Header Mask */

#define ISO14443_4_PCB_S_MASK

0xc2

/*!< ISO14443_4 S-block Header Mask */

s8 handleL4Cmd()

{

s8 err = ERR_NONE;

u8 pcb;

/* read the current frame from the HF-interface */

err = as3955RxNBytes(rxBuffer.data, AS3955_RX_TX_BUFFER_SIZE, &rxBuffer.size);

if (rxBuffer.data[0] & ISO14443_4_PCB_CID_BIT)

{

if (l4Config.cid != rxBuffer.data[1])

{

//Wrong CID;

return ERR_NONE;

}

else

{

/* Reply with CID */

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