SPI slowdown ntag2xx read requested page

[mikeysklar]

Existing code works over I2C. SPI needs a 1ms slowdown as well.

PR# 125 addressed this, but had a commit fail that I am unable to override.

Forum issue

Test on Feather M0 Basic and Adafruit PN532 breakout with NTAG213 Bracelet. Existing code would detect tag, but fail to read pages:

Hello!
Found chip PN532
Firmware ver. 1.6
Waiting for an ISO14443A Card ...
Found an ISO14443A card
  UID Length: 7 bytes
  UID Value: 0x04 0x0D 0xE1 0xAA 0xA2 0x1C 0x91

Seems to be an NTAG2xx tag (7 byte UID)
PAGE 00: Unable to read the requested page!
PAGE 01: Unable to read the requested page!
PAGE 02: Unable to read the requested page!
PAGE 03: Unable to read the requested page!
PAGE 04: Unable to read the requested page!
PAGE 05: Unable to read the requested page!
PAGE 06: Unable to read the requested page!
PAGE 07: Unable to read the requested page!
PAGE 08: Unable to read the requested page!
PAGE 09: Unable to read the requested page!
PAGE 10: Unable to read the requested page!
[...]

Behavior change after 1ms delay:

Hello!
Found chip PN532
Firmware ver. 1.6
Waiting for an ISO14443A Card ...
Found an ISO14443A card
  UID Length: 7 bytes
  UID Value: 0x04 0x0D 0xE1 0xAA 0xA2 0x1C 0x91

Seems to be an NTAG2xx tag (7 byte UID)
PAGE 00: 04 0D E1 60  ..�`
PAGE 01: AA A2 1C 91  ��.�
PAGE 02: 85 48 00 00  �H..
PAGE 03: E1 10 12 00  �...
PAGE 04: 01 03 A0 0C  ..�.
PAGE 05: 34 03 00 FE  4..�
PAGE 06: 00 00 00 00  ....
PAGE 07: 00 00 00 00  ....
PAGE 08: 00 00 00 00  ....
PAGE 09: 00 00 00 00  ....
PAGE 10: 00 00 00 00  ....
PAGE 11: 00 00 00 00  ....
PAGE 12: 00 00 00 00  ....
PAGE 13: 00 00 00 00  ....
PAGE 14: 00 00 00 00  ....
PAGE 15: 00 00 00 00  ....
PAGE 16: 00 00 00 00  ....
PAGE 17: 00 00 00 00  ....
PAGE 18: 00 00 00 00  ....
PAGE 19: 00 00 00 00  ....
PAGE 20: 00 00 00 00  ....
PAGE 21: 00 00 00 00  ....
PAGE 22: 00 00 00 00  ....
PAGE 23: 00 00 00 00  ....
PAGE 24: 00 00 00 00  ....
PAGE 25: 00 00 00 00  ....
PAGE 26: 00 00 00 00  ....
PAGE 27: 00 00 00 00  ....
PAGE 28: 00 00 00 00  ....
PAGE 29: 00 00 00 00  ....
PAGE 30: 00 00 00 00  ....
PAGE 31: 00 00 00 00  ....
PAGE 32: 00 00 00 00  ....
PAGE 33: 00 00 00 00  ....
PAGE 34: 00 00 00 00  ....
PAGE 35: 00 00 00 00  ....
PAGE 36: 00 00 00 00  ....
PAGE 37: 00 00 00 00  ....
PAGE 38: 00 00 00 00  ....
PAGE 39: 00 00 00 00  ....
PAGE 40: 00 00 00 BD  ...�
PAGE 41: 04 00 00 FF  ...�

[mikeysklar]

@ladyada