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The ISO 15693-2 specifies in section 7.2 that a VCD (reader) shall determine the data coding mode by appropriately encoding the Start-of-Frame (SOF).

How does one determine which of the two modes ("1 out of 256" and "1 out of 4") is used and how this can be changed?

PS: A pointer to Android source where this is done would be highly appreciated.

Michael Roland
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qwer1304
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1 Answers1

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The NFC hardware in the Google Nexus devices does not support both modes, so you cannot configure this. It can actually only detect one card at a time.

NFC guy
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  • I hear that the Nexus starts with "1 out of 256" and after detecting a 15693 device switches to "1 out of 4". Is this true? If so - how is it done? – qwer1304 Oct 16 '12 at 18:04
  • The Nexus S (and other Android NFC-enabled phones) uses an NXP PN544 controller, which DS says supports both the "1 out of 256" and the "1 out of 4" data coding modes. Question: How does one select them programmatically? – qwer1304 Oct 17 '12 at 10:01
  • You are right: the DS states that it supports both modes. I cannot find anything relating to this in the UM, though. I think you have to contact Customer Application Support to find out more. – NFC guy Oct 17 '12 at 20:55