CLCR663 code for DESELECT function

K_Salewicz — Thu, 27 Apr 2023 15:06:18 GMT

Can you evaluate why the following code for DESELECT function does not work ?

/* Deselect and switch off NFC RF field according

ISO/IEC 14443-4 B.2.3 Scenario 3 DESELECT

Comment Block No. (0) PCD PICC Block No. (1) Comment

1. rule 1 I(0)0 ===> 0 rule D

2. rule B 1 <=== I(0)0 rule 10

3. S(DESELECT) request ===>

4. <=== S(DESELECT) response rule 3

i-block is decoded in respnse trailer (sw1 sw2)

export void NXP_NFC_Deselect()

{

/* I-Block */

NFC_WriteRegister3(NXP_REG_FIFODATA, 0x43, 0x00); // I(chaining 0) block=0, SW1+SW2: 01000011

NFC_ReadRegister3(NXP_REG_FIFODATA, 0x01, 0x00); // (00xxxxxx)b (not (00xxx101)b

/* S-Block(DESELECT) request, PCB 11000010b (CID 0), CID & NAD (optional fields), EDC (2 bytes, switched off) no INF field */

NFC_WriteRegister2(NXP_REG_FIFODATA, 0xc2);

/* ~4,8 ms max deactivation frame waiting time */

delay_ms(2);

/* S-Block(DESELECT) response */

if (!NFC_ReadRegister1(NXP_REG_FIFODATA, 0xc2)) // TODO supervisory 0001b

{

/* ~4,8 ms max deactivation frame waiting time */

delay_ms(2);

/* FIXMP Rule 8. If the S(DESELECT) request is not answered by an error-free S(DESELECT) response the S(DESELECT) request may be re-transmitted or the PICC may be ignored. */

NFC_ReadRegister1(NXP_REG_FIFODATA, 0xc2)

}

/* Disable NFC RF field */

NXP_NFC_RF_FIELD_OFF();

}

export void NXP_NFC_RF_FIELD_OFF()

{

/* switch RF field OFF */

NFC_Array_Write[0] = 0x86U;

NXP_NFC_WriteRegister(NXP_REG_DRVMODE, NFC_Array_Write, 0x01);

}

u8 NXP_NFC_ATQA()

{

/* Receive 16 bit ATQA */

if(2 != NFC_Array_Read[0U])

{

return NFC_APDU_ATQA_SIZE_ERROR;

}

/* bit 6, 13-16 is 0 */

if ((0x00 != (NFC_Array_Read[1U] && 0x20)) ||

(0x00 != (NFC_Array_Read[1U] && 0xF0)))

{

return NFC_APDU_ATQA_RFU_ERROR;

}

// FIXMP check further parameters

return TRUE;

}

Re: CLCR663 code for DESELECT function

KaiLi — Fri, 05 May 2023 03:06:11 GMT

Hello @K_Salewicz

Please refer to sw6693 to implement your application. sw6693 is an open source routine, please go to the NXP website to download.

Best Regards,

kelly

Re: CLCR663 code for DESELECT function

K_Salewicz — Fri, 05 May 2023 08:29:25 GMT

Thank you very much, Kelly !

topic CLCR663 code for DESELECT function in Processor Expert Software

CLCR663 code for DESELECT function

Re: CLCR663 code for DESELECT function

Re: CLCR663 code for DESELECT function