Configuring nfcpy with PN532 via UART on AML-S905X-CC - "No such device" Error

Software
, ,
1

Hello Community,

I’m trying to integrate a PN532 NFC reader with nfcpy via UART on the AML-S905X-CC with Raspbian 12. Although the reader works flawlessly with libnfc, I’m encountering issues when switching to nfcpy (my goal is to have a python solution to controlling the PN532).

Successful libnfc Setup:

  • Device: PN532, connected via UART at /dev/ttyAML6
  • System: Linux Ubuntu 20.04
  • Configured using:
    ./configure --with-drivers=pn532_uart --sysconfdir=/etc
sudo make install
  • Established udev rules for device permissions.
  • Merged the uart-a overlay and ensured correct pin connections:
    • VCC to Pin 2 (7J1)
    • GND to Pin 6 (7J1)
    • SCL (TX) to Pin 8 (7J1)
    • SDA (RX) to Pin 10 (7J1)

Current nfcpy Issue:
Attempting to initialize with:

import nfc

def main():
    clf = nfc.ContactlessFrontend('tty:AML6:pn532')
    if clf:
        print("Device is connected")
        clf.close()
    else:
        print("Failed to connect to the device")

if __name__ == "__main__":
    main()

Results in:

OSError: [Errno 19] No such device

Device permissions and path are verified correct, and I am in the dialout group.

Questions:

  1. Has anyone successfully used PN532 via UART with nfcpy?
  2. Are there specific nfcpy configurations or versions that are required?
  3. Do I need to adjust any Linux settings further to enable this communication?

I would greatly appreciate any insights or guidance on how to get nfcpy to recognize my PN532 device connected via UART.

Thank you!

2
  1. Did you run your script with root permissions or via sudo?
  2. OSError: [Errno 19] No such device indicates your script is trying to attach to something that doesn’t exist. How does the NFC library convert tty:AML6 to the proper virtual device in /dev? Use strace to see what file it’s trying to access and returning -19.