1 ============================================== 1 ============================================================================
2 Kernel driver for the NXP Semiconductors PN544 2 Kernel driver for the NXP Semiconductors PN544 Near Field Communication chip
3 ============================================== 3 ============================================================================
4 4
5 5
6 General 6 General
7 ------- 7 -------
8 8
9 The PN544 is an integrated transmission module 9 The PN544 is an integrated transmission module for contactless
10 communication. The driver goes under drives/nf 10 communication. The driver goes under drives/nfc/ and is compiled as a
11 module named "pn544". 11 module named "pn544".
12 12
13 Host Interfaces: I2C, SPI and HSU, this driver 13 Host Interfaces: I2C, SPI and HSU, this driver supports currently only I2C.
14 14
15 Protocols 15 Protocols
16 --------- 16 ---------
17 17
18 In the normal (HCI) mode and in the firmware u 18 In the normal (HCI) mode and in the firmware update mode read and
19 write functions behave a bit differently becau 19 write functions behave a bit differently because the message formats
20 or the protocols are different. 20 or the protocols are different.
21 21
22 In the normal (HCI) mode the protocol used is 22 In the normal (HCI) mode the protocol used is derived from the ETSI
23 HCI specification. The firmware is updated usi 23 HCI specification. The firmware is updated using a specific protocol,
24 which is different from HCI. 24 which is different from HCI.
25 25
26 HCI messages consist of an eight bit header an 26 HCI messages consist of an eight bit header and the message body. The
27 header contains the message length. Maximum si 27 header contains the message length. Maximum size for an HCI message is
28 33. In HCI mode sent messages are tested for a 28 33. In HCI mode sent messages are tested for a correct
29 checksum. Firmware update messages have the le 29 checksum. Firmware update messages have the length in the second (MSB)
30 and third (LSB) bytes of the message. The maxi 30 and third (LSB) bytes of the message. The maximum FW message length is
31 1024 bytes. 31 1024 bytes.
32 32
33 For the ETSI HCI specification see 33 For the ETSI HCI specification see
34 http://www.etsi.org/WebSite/Technologies/Proto 34 http://www.etsi.org/WebSite/Technologies/ProtocolSpecification.aspx
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