nfcpy

No reader found (ACR122U, OS X Yosemite)

Asked by Alexandre Cisneiros

Hello. I'm trying to setup nfcpy on my machine (Mac OS X Yosemite).

I've connected an ACR122U reader via USB. The red LED is On and, if I touch a card, the reader beeps and the LED turns yellow. I, however, cannot get nfcpy to work with it.

$ python examples/tagtool.py -d nfc.dev
[main] enable debug output for module 'nfc.dev'
[nfc.clf] searching for reader with path 'usb'
[nfc.dev.transport] using pyusb version 1.x
[nfc.dev.transport] path matches '^(usb|)$'
[nfc.dev] trying usb:072f:2200
[nfc.dev] import nfc.dev.acr122
[nfc.clf] no reader found at 'usb'
[main] no contactless reader found

I have installed libusb and pyusb. I've tried using the default drivers as well as installing the ones from ACS website.
I've tried searching all over the internet, but cannot find a solution to get me past this point.

Thanks in advance to anyone who can help me!
Alexandre.

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Stephen Tiedemann (stephen-tiedemann) said : 		#1

It could that some other process is using the reader, for example the PC/SC daemon. Or that the hardware is not accessible from an ordinary user account - try as superuser to find out. If it is a permission problem, then you could check if the note in https://nfcpy.readthedocs.org/en/latest/topics/get-started.html#installation can be applied on OS X.

Generally speaking, nfcpy does not require any specific driver for the ACR122, it just talks directly with the contacless chip through the USB-CCID interface that an ACR122 presents.

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Alexandre Cisneiros (alexandre-6) said : 		#2

I've tried super user as well. The fact that the light on the reader is on and that if I touch a tag it beeps makes me think there is some process using the reader.

I tried killing the pcsc process, but nothing changes. Is there a way of knowing which process may be using the reader? I have no idea how to find that out on OS X.

On a side note: `pcsctest` works. Don't know if that is relevant.

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Stephen Tiedemann (stephen-tiedemann) said : 		#3

If pcsctest works then almost certainly there is pcscd running. What works on my Ubuntu is to learn which processes use USB device files by "sudo lsof | grep "/dev/bus/usb/". Maybe that also works on OS X but I can't proof.

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