TI NFC 產(chǎn)品在智能電視中的應(yīng)用設(shè)計(jì)
3系統(tǒng)軟件設(shè)計(jì)
本文引用地址:http://www.ex-cimer.com/article/268083.htm系統(tǒng)軟件設(shè)計(jì)主要包括智能電視應(yīng)用中的各項(xiàng)功能的實(shí)現(xiàn):有對TAG的讀取以獲取特定電視或者網(wǎng)絡(luò)節(jié)目的權(quán)限,有對藍(lán)牙配對WIFI配對的需求實(shí)現(xiàn)快速建立藍(lán)牙與WIFI的連接,另外電視可以通過P2P功能獲取手機(jī)相關(guān)圖片,鏈接信息,實(shí)現(xiàn)信息的快速切換。也可以通過NFC對Firmware進(jìn)行無線升級。
3.1標(biāo)簽讀取
TRF7970A可支持ISO15693,ISO14443A/B等標(biāo)簽的讀取(如圖6所示)。
圖6 TRF7970A支持的卡片標(biāo)準(zhǔn)
3.2藍(lán)牙配對
根據(jù)NFC論壇與藍(lán)牙SIG聯(lián)盟定義的安全簡易配對Bluetooth secure simple paring using NFC(NFCForum-AD-BTSSP)規(guī)范,將藍(lán)牙配對信息(如下數(shù)組)通過MCU寫RF430CL330H的NDEF區(qū)域,當(dāng)任何具有NFC功能的設(shè)備,讀取到該內(nèi)容后將自動進(jìn)行藍(lán)牙配對的連接過程。
藍(lán)牙的OOB數(shù)據(jù)格式如圖7所示。包括OOB數(shù)據(jù)長度,藍(lán)牙設(shè)備地址與名稱,設(shè)備種類以及UUID.
圖7 NDEF中的藍(lán)牙OOB數(shù)據(jù)格式
藍(lán)牙的NDEF寫入信息數(shù)據(jù)結(jié)構(gòu)如下:
Unsigned char NDEF_Application_Data[]=
{
//NDEF Tag Application Name
0xD2,0x76,0x00,0x00,0x85,0x01,0x01,
//Capability Container ID
0xE1,0x03,
//Capability Container
0x00,0x0F,//CCLEN
0x20,//Mapping version 2.0
0x00,0x3B,//MLe(49 bytes); Maximum R-APDU data size
0x00,0x34,//MLc(52 bytes); Maximum C-APDU data size
0x04,//Tag,F(xiàn)ile Control TLV(4 = NDEF file)
0x06,//Length,F(xiàn)ile Control TLV(6 = 6 bytes of data for this tag)
0xE1,0x04,//File Identifier
0x0C,0x02,//Max NDEF size(3072 bytes)
0x00,//NDEF file read access condition,read access without any security
0x00,//NDEF file write access condition; write access without any security
//NDEF File ID
0xE1,0x04,
0x00,0x44,//NLEN; NDEF length(68 byte long message)
0xD2,//MB=1b,ME=1b,CF=0b,SR=1b,IL=0b,TNF=010b
0x20,//Record Type Length:32 octets
0x21,//payload length:33 octets;
0x61,0x70,0x70,0x6C,0x69,0x63,0x61,0x74,0x69,0x6F,0x6E,0x2F,0x76,
0x6E,0x64,0x2E,0x62,0x6C,0x75,0x65,0x74,0x6F,0x6F,0x74,0x68,0x2E,
0x65,0x70,0x2E,0x6F,0x6F,0x62,//Record Type Name:application/vnd.blue
//tooth.ep.oob
0x21,0x00,//OOB optional data length:33 octets
0x06,0x05,0x04,0x03,0x02,0x01,//bluetooth device address:
//01:02:03:04:05:06(example address only)
0x0D,//EIR Data Length:13 octets
0x09,//EIR Data Type:Complete Local Name
0x48,0x65,0x61,0x64,0x53,0x65,0x74,0x20,0x4E,0x61,0x6D,0x65,//
//Bluetooth Local Name:HeadSet Name
0x04,//EIR Data Length:4 octets
0x0D,//EIR Data Type:Class of device
0x04,0x04,0x20,//Class of Device:0x20:Service Class=
//Audio,0x04:Major Device Class=Audio/Video,0x04:Minor Device Class=Wearable //Headset Device
0x05,//EIR Data Length:5 octets
0x03,//EIR Data type:16-bit Service Class UUID list(complete)
0x1E,0x11,0x0B,0x11 //16-bit Service Class UUID list(complete);0x111E–
//HFP-HF,0x011B?A2DP-SNK
};
3.3 Peer to Peer
P2P是基于NFC論壇定義的Simple NDEF Exchange Protocol(NFCForum-TS-SNEP)規(guī)范,其主要流程如下。手機(jī)可以通過P2P的功能將相關(guān)的信息例如圖片,鏈接等與電視進(jìn)行快速交互。
圖8 P2P的軟件操作流程
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