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@@ -37,6 +37,40 @@ Expect random error, but seem to stay stable and working. ² Polling is stopped at detection but no tag is exposed. +# UDev rules + +You may want to add some UDev's rule for nfc device to make things easier. +You can put those lines into /etc/udev/rules.d/99-nfc.rules +```Shell +ACTION!="add", GOTO="nfc_pn53x_end" + +# Advanced Card Systems, Ltd ACR122U +ATTRS{idVendor}=="072f", ATTRS{idProduct}=="2200", MODE="0666", SYMLINK+="nfc%n" + +# SCM Microsystems, Inc. SCL3711-NFC&RW +ATTRS{idVendor}=="04e6", ATTRS{idProduct}=="5591", MODE="0666", SYMLINK+="nfc%n" + +LABEL="nfc_pn53x_end" +``` + +# Kernel module +The SCL3711 is supported by the kernel and neard, so it takes the device and prevent the libnfc to use it. +If you have an error saying that the device is busy, it's probably the reason why. + +You have to unload nfc kernel modules to get it work using libnfc. +```ShellSession +root@localhost# rmmod pn533_usb +root@localhost# rmmod pn533 +root@localhost# rmmod nfc +``` + +To make it permanent you can add this file: /etc/modprobe.d/blacklist-nfc.conf +``` +blacklist nfc +blacklist pn533 +blacklist pn533_usb +``` + # Compilation option * USE_LIBNFC - Enable or disable the 'libnfc' usage. Default is ON. |