linux/Documentation/nfc/nfc-pn544.txt
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   1Kernel driver for the NXP Semiconductors PN544 Near Field
   2Communication chip
   3
   4General
   5-------
   6
   7The PN544 is an integrated transmission module for contactless
   8communication. The driver goes under drives/nfc/ and is compiled as a
   9module named "pn544".
  10
  11Host Interfaces: I2C, SPI and HSU, this driver supports currently only I2C.
  12
  13Protocols
  14---------
  15
  16In the normal (HCI) mode and in the firmware update mode read and
  17write functions behave a bit differently because the message formats
  18or the protocols are different.
  19
  20In the normal (HCI) mode the protocol used is derived from the ETSI
  21HCI specification. The firmware is updated using a specific protocol,
  22which is different from HCI.
  23
  24HCI messages consist of an eight bit header and the message body. The
  25header contains the message length. Maximum size for an HCI message is
  2633. In HCI mode sent messages are tested for a correct
  27checksum. Firmware update messages have the length in the second (MSB)
  28and third (LSB) bytes of the message. The maximum FW message length is
  291024 bytes.
  30
  31For the ETSI HCI specification see
  32http://www.etsi.org/WebSite/Technologies/ProtocolSpecification.aspx
  33
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