swh:1:snp:c2847dfd741eae21606027cf29250d1ebcd63fb4
- v5.9-rc8
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- v5.0
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Tip revision: 64291f7db5bd8150a74ad2036f1037e6a0428df2 authored by Linus Torvalds on 30 August 2015, 18:34:09 UTC
Linux 4.2
Linux 4.2
Tip revision: 64291f7
nfc-pn544.txt
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