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