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- Kernel driver for the NXP Semiconductors PN544 Near Field
- Communication chip
- General
- -------
- The PN544 is an integrated transmission module for contactless
- communication. The driver goes under drives/nfc/ and is compiled as a
- module named "pn544".
- Host Interfaces: I2C, SPI and HSU, this driver supports currently only I2C.
- Protocols
- ---------
- In the normal (HCI) mode and in the firmware update mode read and
- write functions behave a bit differently because the message formats
- or the protocols are different.
- In the normal (HCI) mode the protocol used is derived from the ETSI
- HCI specification. The firmware is updated using a specific protocol,
- which is different from HCI.
- HCI messages consist of an eight bit header and the message body. The
- header contains the message length. Maximum size for an HCI message is
- 33. In HCI mode sent messages are tested for a correct
- checksum. Firmware update messages have the length in the second (MSB)
- and third (LSB) bytes of the message. The maximum FW message length is
- 1024 bytes.
- For the ETSI HCI specification see
- http://www.etsi.org/WebSite/Technologies/ProtocolSpecification.aspx
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