• Registered: 2013-11-04
  • Posts: 2

Topic: nfc shield v 2.0 TgInitAsTarget response problem

Hello! I try to emulate mifare classic using nfc shield v 2.0 + Arduino UNO

Nfc shield include PN 532. Data transfer  is realized on SPI. When I try to send command TgInitAsTarget I don't receive nothing answers from PN532:-(  I used some code from libnfc.  Can you help me?

Logs:

Start Arduino UNO R3
>> 0 FF 4 FC D4 6 63 3D 86 0
<< 0 FF 3 FD D5 7 0 24 0 0
>> 0 FF 5 FB D4 8 63 3D 0 84 0
<< 0 FF 2 FE D5 9 22 0 0
>> 0 FF 4 FC D4 6 63 2 C1 0
<< 0 FF 3 FD D5 7 80 A4 0 0
>> 0 FF 5 FB D4 8 63 2 80 3F 0
<< 0 FF 2 FE D5 9 22 0 0
>> 0 FF 4 FC D4 6 63 3 C0 0
<< 0 FF 3 FD D5 7 80 A4 0 0
>> 0 FF 5 FB D4 8 63 3 80 3E 0
<< 0 FF 2 FE D5 9 22 0 0
>> 0 FF 4 FC D4 6 63 D B6 0
<< 0 FF 3 FD D5 7 0 24 0 0
>> 0 FF 5 FB D4 8 63 D 0 B4 0
<< 0 FF 2 FE D5 9 22 0 0
>> 0 FF 4 FC D4 6 63 38 8B 0
<< 0 FF 3 FD D5 7 5 1F 0 0
>> 0 FF 5 FB D4 8 63 38 5 84 0
<< 0 FF 2 FE D5 9 22 0 0
>> 0 FF 3 FD D4 12 14 6 0
<< 0 FF 2 FE D5 13 18 0 0
>> 0 FF 4 FC D4 6 63 3 C0 0
<< 0 FF 3 FD D5 7 80 A4 0 0
>> 0 FF 5 FB D4 8 63 3 80 3E 0
<< 0 FF 2 FE D5 9 22 0 0
>> 0 FF 4 FC D4 6 63 3 C0 0
<< 0 FF 3 FD D5 7 80 A4 0 0
>> 0 FF 5 FB D4 8 63 3 80 3E 0
<< 0 FF 2 FE D5 9 22 0 0
>> 0 FF 2 FE D4 2 2A 0
<< 0 FF 6 FA D5 3 32 1 6 7 E8 0 0
PN532 v1.6 (0x7)
>> 0 FF 4 FC D4 6 63 2 C1 0
<< 0 FF 3 FD D5 7 80 A4 0 0
>> 0 FF 5 FB D4 8 63 2 80 3F 0
<< 0 FF 2 FE D5 9 22 0 0
>> 0 FF 4 FC D4 6 63 3 C0 0
<< 0 FF 3 FD D5 7 80 A4 0 0
>> 0 FF 5 FB D4 8 63 3 80 3E 0
<< 0 FF 2 FE D5 9 22 0 0
>> 0 FF 4 FC D4 6 63 D B6 0
<< 0 FF 3 FD D5 7 0 24 0 0
>> 0 FF 5 FB D4 8 63 D 0 B4 0
<< 0 FF 2 FE D5 9 22 0 0
>> 0 FF 3 FD D4 12 20 FA 0
<< 0 FF 2 FE D5 13 18 0 0
>> 0 FF 4 FC D4 6 63 5 BE 0
<< 0 FF 3 FD D5 7 20 4 0 0
>> 0 FF 5 FB D4 8 63 5 24 98 0
<< 0 FF 2 FE D5 9 22 0 0
>> 0 FF 27 D9 D4 8C 5 8 0 12 34 56 40 1 FE A2 A3 A4 A5 A6 A7 C0 C1 C2 C3 C4 C5 C6 C7 FF FF AA 99 88 77 66 55 44 33 22 11 0 0 1C 0
nothing response

  • yobibe
  • Administrator
  • Offline
  • Registered: 2011-04-08
  • Posts: 142

Re: nfc shield v 2.0 TgInitAsTarget response problem

Try to compare your trace against one from libnfc (use LIBNFC_LOG_LEVEL=3 to see the raw frames)
There might be some differences in the initialization of the chip.
Right now I don't have a reader with me so I cannot do it myself.

Other tips:
TgInitAsTarget sends its result only once a target has been acquired or after timeout if you did configure a timeout.
Try at lower SPI speed. The last frame is much longer and maybe more sensible to timing.
And obviously you implemented the SPI handshake properly, did you?

Good luck
Phil

yobibe's Website

3 Reply by alexeybar2008 (edited by alexeybar2008 2013-11-06 18:24:38)

  • Registered: 2013-11-04
  • Posts: 2

Re: nfc shield v 2.0 TgInitAsTarget response problem

I have tried lower SPI speed but also got no response from pn 532. I used some code from libnfc 1.3.9 with changes of version 1.7. Unfortunately I can not make full use of spi, because IRQ pin pn532 not used in nfc shield. If I use a delay of 5/15/50ms after sending the command is also not getting a response of pn532.

Example  “PtoPTarge”  (Adafruits PN532 Library) does not work  also.(Other examples are working normally)