Help. Can´t get Anticollsion loop with two PICCs.

patricio — Tue, 06 Oct 2020 09:30:27 GMT

Hello,

I´m working with RC522 and I´m dealing with the anticolision loop when two tags are shown in the antenna. The two tags I am working with have the following UIDs:

PICC #1: 86 A0 83 EE

PICC #2: 16 9A 0A 3B

When PCD sends SEL + NVB (0x93 + 0x20), both PICC answer and the information I get from the registers is the following:

ComIrqReg: 0x66.

Bit TxIRq = 1.

Bit RxIRq = 1. (The end of a valid stream detected)

Bit ErrIRq = 1. (Error bit in ErrorReg is set)

ErrorReg: 0x08.

Bit CollErr = 1. (A collision detected)

CollErr: 0x05.

Bit CollPosNotValid = 0

Bit CollPos[4..0] = 05. (Collision in the fifth bit.)

Let´s confirm the collision is in the fifth bit:

PICC #1 UID0 = 0x86 = 1000 0110

PICC #2 UID0 = 0x16 = 0001 0110

However my doubts are about the information PCD has to send back to the PICC and the value of BitFrammingReg Register:

BitFrammingReg=0x55 and SEL (0x93) + NVD (0x25)+ 10110 ?????

Or BitFrammingReg=0x55 and SEL (0x93) + NVD (0x25)+ 01101 ?????

I tried different options but I'm not able to succeed. Please find attached the code file in case somebody could have a look and give me a clue.

Any help will be apreciated. Thank you.

Re: Help. Can´t get Anticollsion loop with two PICCs.

stephanie_m — Wed, 14 Oct 2020 00:54:18 GMT

Hello,

Could you please help me with more information of the MCU you are using as a host ? firmware you are using, if you can provide a link it would be helpful. ?

Regards,
Estephania

Re: Help. Can´t get Anticollsion loop with two PICCs.

patricio — Wed, 21 Oct 2020 06:00:17 GMT

Hello Estephania,

Thank you for your reply. It is solved already.

BR.

NFCのトピックRe: Help. Can´t get Anticollsion loop with two PICCs.

Help. Can´t get Anticollsion loop with two PICCs.

Re: Help. Can´t get Anticollsion loop with two PICCs.

Re: Help. Can´t get Anticollsion loop with two PICCs.