PN532 -> systematic Not ready, timeout

[Franklin62120]

Hi !!

I'm trying the pn532.py example : https://github.com/eclipse/upm/blob/master/examples/python/pn532.py

I've just changed line 31
myNFC = upmPn532.PN532(3, 2)
to this one to match Respeaker specifications (https://github.com/respeaker/mraa/blob/master/docs/axolotl.md )
myNFC = upmPn532.PN532(0, 0, 0, 0x24)

But got systematically this error :

respeaker@v2:~$ python3 pn532.py
sendCommandCheckAck: Not ready, timeout
Could not identify PN532
Exiting

I'm using a Respeaker Core V2 :
http://wiki.seeedstudio.com/ReSpeaker_Core_v2.0/#hardware-overview
and this NFC card :
http://wiki.seeedstudio.com/Grove_NFC/#grove-nfc-v11

I tried with LibNfc, got no problem to read a tag. What could be the error when using UPM lib ?