MT6762平台NXP NFC代码移植要点

本文主要是介绍MT6762平台NXP NFC代码移植要点，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！

１找到官网，获取源码包
NXP　NFC移植源码
https://github.com/NXPNFCProject
固件
https://github.com/NXP/nfc-NXPNFCC_FW/tags

2 主要介绍源码移植
打开https://github.com/NXPNFCProject
下载对于源码包放到工程对于目录
nfcandroid_nfc_hidlimpl-master -->hardware/nxp/nfc目录下
nfcandroid_secureelement-master -->hardware/nxp/secure_element目录下
NFC_NCIHAL_libnfc-nci-master-->system/nfc目录下
NXPNFC_Reference-master-->vendor/nxp目录下
NFC_NCIHAL_base-master-->frameworks/base目录下,这个目录的代码移植完毕，需要删除对于obj（或用make clean）再重新编译.

i2c节点驱动代码
NXPNFC_I2CDriver-master-->kernel-4.9/drivers/misc/mediatek/nfc/
修改对应的makeFile，添加编译进去

3 其它注意点
DWS,配置i2c速率，Ven,DWL,IRQ等GPIO的读中断．
dts配置．配置i2c地址，速率，Ven,DWL,IRQ等GPIO　的dts

如果使用外部系统提供的CLK,需要接CLR_REQ脚，CLR_REQ时钟请求脚，由NXP固件控制，当需要外部时钟时（读NFC标签才需要），CLK_REQ拉高,不接时，用NFC参考电路模块使用的时钟．

DWL是需要升级固件时的控制脚．有些NFC模块一定要拉低才能正常工作，否则认为进入升级状态．

移植完毕后，开机完成就有NFC设备初始化，通过打印LOG确定i2c是否初始化成功，固件是否初始化成功．

４　LOG 分析
I2C总线通信成功LOG
03-21 09:39:52.101 399 1691 D NxpTml : PN54X - Tml Reader Thread Started................
03-21 09:39:52.101 399 1692 D NxpTml : PN54X - Tml Writer Thread Started................
03-21 09:39:52.101 399 1692 D NxpTml : PN54X - Tml Writer Thread Running................
03-21 09:39:52.101 399 1694 D NxpHal : thread started
03-21 09:39:52.101 399 1691 D NxpTml : PN54X - Read requested.....
03-21 09:39:52.101 399 399 D : sem_timedwait() succeeded
03-21 09:39:52.101 399 1691 D NxpTml : PN54X - Invoking I2C Read.....
03-21 09:39:52.102 399 1692 D NxpTml : PN54X - Write requested.....
03-21 09:39:52.102 399 1692 D NxpTml : PN54X - Invoking I2C Write.....
03-21 09:39:52.102 399 1692 D NxpTml : PN54X - Invoking I2C Write.....
03-21 09:39:52.102 399 1692 D NxpNciX : len = 4 => 20000100
03-21 09:39:52.102 399 1692 D NxpTml : PN54X - I2C Write successful.....
03-21 09:39:52.102 399 1692 D NxpTml : PN54X - Posting Fresh Write message.....
03-21 09:39:52.102 399 1692 D NxpTml : PN54X - Tml Writer Thread
....
....
....
03-21 09:39:52.107 399 1691 D NxpTml : PN54X - Read requested.....
03-21 09:39:52.107 399 1691 D NxpTml : PN54X - Invoking I2C Read.....
03-21 09:39:52.108 399 1692 D NxpTml : PN54X - Write requested.....
03-21 09:39:52.108 399 1692 D NxpTml : PN54X - Invoking I2C Write.....
03-21 09:39:52.108 399 1692 D NxpTml : PN54X - Invoking I2C Write.....
03-21 09:39:52.108 399 1692 D NxpNciX : len = 5 => 2001020000
03-21 09:39:52.108 399 1692 D NxpTml : PN54X - I2C Write successful.....
03-21 09:39:52.108 399 1692 D NxpTml : PN54X - Posting Fresh Write message.....
03-21 09:39:52.108 399 1692 D NxpTml : PN54X - Tml Writer Thread Running................
03-21 09:39:52.108 399 1694 D NxpHal : write successful status = 0x0
03-21 09:39:52.108 399 399 D NxpHal : Response timer started
03-21 09:39:52.108 399 399 D NxpHal : Waiting after ext cmd sent
03-21 09:39:52.109 399 1691 D NxpTml : PN54X - I2C Read successful.....len = 39
03-21 09:39:52.109 1627 1627 V MediaProvider: test album art path: /storage/emulated/0/Android/data/com.android.providers.media/albumthumbs
03-21 09:39:52.109 399 1691 D NxpTml : PN54X - Posting read message.....