87 00 response from CR95HF reader most of the times

[uma]

Posted on November 18, 2015 at 05:25

I have to integrate NFC into STM32 series controller.

I am able to successfully detect the tag by sending following commands. After successful completion of Select2 process.I send PWD_AUTH commnd as my tag is read and write protected. I get response as 87 00(Frame wait time or no Tag) But my PWD_AUTH command internally it is success and i can get access to read and write into the tag.PWD given is accurate and correct in ascii values. Can you let me know why instead of PACK response i get 87 00 </colgroup>

0x02 0x02 0x00 0x00

PCD Field OFF

0x09 0x04 0x68 0x01 0x07 0x00 Reset RF

0x09 0x04 0x68 0x01 0x07 0x10

Set RF

0x02 0x07 0x02 0x00 0x00 0x00 0x00 0x02 0x02

Protocol Select

0x09 0x04 0x3A 0x00 0x58 0x04 PCD WR REG Gain:0x58

0x09 0x04 0x68 0x01 0x01 0xD3 PCD WR REG Gain:0xD3

0x04 0x02 0x26 0x07

REQA

0x04 0x03 0x93 0x20 0x08

AntiCol1

0x04 0x08 0x93 0x70 0x88 0x04 0xBF 0x66 0x55 0x28

Select1

0x04 0x03 0x95 0x20 0x08 AntiCol2

0x04 0x03 0x95 0x20 0x08 0x04 0x08 0x95 0x70 0x88 0x04 0x0E 0x90 0x77

0x28 Select2

0x04 0x06 0x1B 0x52 0x6F 0x61 0x64 0x28

PWD_AUTH

UID: 0x04 0xBF 0x66

0x04 0x0E 0x90 0x77 #ntag213

[Nickname5101_O · Accepted solution]

Posted on November 18, 2015 at 09:46

Dear,

if your command PWD_Auth is correct and if your tag responds , (you can check it with a scope and a loop to spy the communication) , CR95HF probably miss the reply because it is out of  Max frame delay time , play with PP MM DD parameter to enlarge CR95HF  duration of detection window . Regards