How can I make read_passive_target wait indefinitely until a tag becomes available?

[xetum]

Other libraries have this possibility. I don't see how in this one. Thanks

[FoamyGuy]

You can put it inside of a loop such as in the simpletest example here: https://github.com/adafruit/Adafruit_CircuitPython_PN532/blob/master/examples/pn532_simpletest.py

If if it does not find a card it will just keep retrying until one is in range.

The relavent code in that example is at the bottom:

print("Waiting for RFID/NFC card...")
while True:
    # Check if a card is available to read
    uid = pn532.read_passive_target(timeout=0.5)
    print(".", end="")
    # Try again if no card is available.
    if uid is None:
        continue
    print("Found card with UID:", [hex(i) for i in uid])

[xetum]

Yes I know, I was trying to do it without the polling loop, as with other libraries El dom., 4 oct. 2020 20:01, foamyguy <[email protected]> escribió:

…

You can put it inside of a loop such as in the simpletest example here: https://github.com/adafruit/Adafruit_CircuitPython_PN532/blob/master/examples/pn532_simpletest.py If if it does not find a card it will just keep retrying until one is in range. The relavent code in that example is at the bottom: print("Waiting for RFID/NFC card...")while True: # Check if a card is available to read uid = pn532.read_passive_target(timeout=0.5) print(".", end="") # Try again if no card is available. if uid is None: continue print("Found card with UID:", [hex(i) for i in uid]) — You are receiving this because you authored the thread. Reply to this email directly, view it on GitHub <#43 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AB3DJB6L5J2JY465JWYNZ4DSJCZ7BANCNFSM4SD2SLHA> .

[FoamyGuy]

https://github.com/adafruit/Adafruit-PN532/blob/d988fb4a28e54efe4de638883ce00858064ddf5f/Adafruit_PN532.h#L173

In the arduino library there is a comment that mentions using a timeout of 0 will make it wait forever.

Did you try setting timeout=0 in the CircuitPython one? Maybe it will work the same.

[xetum]

Ok, I'll try El dom., 4 oct. 2020 21:05, foamyguy <[email protected]> escribió:

…

https://github.com/adafruit/Adafruit-PN532/blob/d988fb4a28e54efe4de638883ce00858064ddf5f/Adafruit_PN532.h#L173 In the arduino library there is a comment that mentions using a timeout of 0 will make it wait forever. Did you try setting timeout=0 in the CircuitPython one? Maybe it will work the same. — You are receiving this because you authored the thread. Reply to this email directly, view it on GitHub <#43 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AB3DJBZ65AZ76XRA6OYEEGLSJDBQBANCNFSM4SD2SLHA> .

[xetum]

No, timeout=0 does polling. I think it could be added to the library, even more so the arduino version does blocking. Regards, Francesc El dom., 4 oct. 2020 21:12, Francesc Oller Teijon <[email protected]> escribió:

…

Ok, I'll try El dom., 4 oct. 2020 21:05, foamyguy ***@***.***> escribió: > > https://github.com/adafruit/Adafruit-PN532/blob/d988fb4a28e54efe4de638883ce00858064ddf5f/Adafruit_PN532.h#L173 > > In the arduino library there is a comment that mentions using a timeout > of 0 will make it wait forever. > > Did you try setting timeout=0 in the CircuitPython one? Maybe it will > work the same. > > — > You are receiving this because you authored the thread. > Reply to this email directly, view it on GitHub > <#43 (comment)>, > or unsubscribe > <https://github.com/notifications/unsubscribe-auth/AB3DJBZ65AZ76XRA6OYEEGLSJDBQBANCNFSM4SD2SLHA> > . >