Libnfc:FAQ

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No NFC device found error

with a UART-based reader

Since v1.7.0, your PN532 UART device needs some configuration in newly introduced configuration file (eg. /etc/nfc/libnfc.conf).
Please read NEWS file, then copy libnfc.conf.sample to the right place.
Make sure to put the file in SYSCONFDIR/nfc/libnfc.conf
If you don't want SYSCONFDIR to be /usr/local/etc, use ./configure --sysconfdir=/etc

with an ACR122U under Windows

Remove ACR122U drivers from ACS

Too small reply error

With Touchatag or ACR122U

Avoid using pcscd and libnfc with acr122_usb driver all together.
You can stop pcscd or disable support of that reader by pcscd by changing the libccid list of supported readers.

How do I change the libccid list of supported readers?

  • Get the libccid source code;
  • edit the file readers/supported_readers.txt;
  • remove the line with the VID/PID of the reader you want to disable;
  • reinstall the libccid driver, or just the regenerated src/Info.plist.
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