Listen.py PN532v1.6 at /dev/ttyAMA0 timeout waiting for ACK

Asked by Pacific Redwood on 2015-11-17

Greetings.
Many thanks for this tool. A couple issues on RPi B+ running a Sunfounder with PN532 chip (nfcpy v10.2)

Success:
pi@raspberrypi ~/nfcpy/trunk/examples $ python tagtool.py --device tty:AMA0:pn532
[nfc.clf] searching for reader on path tty:AMA0:pn532
[nfc.clf] using PN532v1.6 at /dev/ttyAMA0
** waiting for a tag **
Type2Tag 'NXP NTAG216' ID=04FDE39A793280

Fail:
pi@raspberrypi ~/nfcpy/trunk/examples $ python listen.py tt2 --device tty:AMA0:pn532
687 ms [nfc.clf] searching for reader on path tty:AMA0:pn532
1407 ms [nfc.clf] using PN532v1.6 at /dev/ttyAMA0
4081 ms [nfc.clf.pn532] input/output error while waiting for ack

Fail:
pi@raspberrypi ~/nfcpy/trunk/examples $ python listen.py tt2 --device tty:AMA0:pn53x
859 ms [nfc.clf] searching for reader on path tty:AMA0:pn53x
1031 ms [nfc.clf.pn53x] pn53x is not a driver module, use pn531, pn532, or pn533
no device found on path 'tty:AMA0:pn53x'

Question information

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Answered
For:
nfcpy Edit question
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Last query:
2015-11-17
Last reply:
2015-11-25

Thanks for the report. I could reproduce this with a USB converter and fixed by a one millisecond delay when cancelling the timed-out pn53x listen command. Would be nice if you could verify with your setup (the tty:AMA0 typically runs at 115.2 kbps compared to tty:USB at 922.6 kbps). The fix appeared on trunk revision 267, just grab latest.

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