联发科7688开发者指南_MT7688(中文版).pdf_widora

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MediaTek LinkIt Smart 7688

开发者指南（中文版）

版本：1.1

发布日期：2016 年 2 月 22 日

译者序 ····················································································································· 1

1.概述 ······················································································································ 2

1.1 什么是 MediaTek Linklt ····················································································· 2

1.2 什么是 MidiaTek LinkIt Smart 7688 开发平台 ··························································· 2

1.3 硬件开发包 ···································································································· 2

1.4 程序设计环境 ································································································· 2

1.5 软件开发工具 ································································································· 3

1.6 开始向导 ······································································································· 3

1.7 更多信息 ······································································································· 4

1.8 加入我们 ······································································································· 4

2.硬件开发包 ············································································································· 5

2.1 MediaTek MT7688AN 芯片规格概述 ······································································ 5

2.2 LinkIt Smart 7688 ······························································································ 6

2.3 LinkIt Smart 7688 Duo ·······················································································14

2.4 FCC,CE 和 NCC 认证 ·······················································································21

3.程序设计环境向导 ···································································································22

3.1 平台操作系统 ································································································22

3.2 程序设计环境概述 ··························································································22

3.3 不同开发板的程序设计模型 ··············································································23

3.4 网络环境 ······································································································24

3.5 使用 C/C++编程 ·····························································································25

3.6 使用 Python 编程 ····························································································26

3.7 使用 Node.js 编程 ···························································································28

4.软件和工具 ············································································································30

4.1 软件和工具 ···································································································30

4.2 支持的主机环境 ·····························································································30

4.3 默认的 OpenWrt 包 ··························································································31

4.4 OPKG 包管理器 ······························································································31

4.5 系统配置 ······································································································32

4.6 系统配置工作 ································································································41

4.7 文件编辑器和传输 ··························································································48

5.LinkIt Smart 7688 的外设编程 ·····················································································54

5.1 如何使用 MRAA 访问 LinkIt Smart 7688 的外设 ······················································54

5.2 如何使用 UPM 访问传感器和外设·······································································61

6.LinkIt Smart 7688 Duo 的外设编程················································································62

6.1 安装 Arduino IDE ····························································································62

6.2 安装硬件支持包 ·····························································································62

6.3 安装 LinkIt Smart 7688 Duo 串口驱动 ···································································66

6.4 LinkIt Smart 7688 的编程模式 ·············································································67

6.5 使用简易的 UART 接口编程 ··············································································70

6.6 使用 Firmata 协议编程 ·····················································································72

6.7 使用 Arduino Yun Bridge 库编程 ··········································································84

7.如何编译生成固件和启动引导程序 ··············································································86

7.1 编译固件 ······································································································86

7.2 编译启动引导程序（Bootloader） ·······································································87

8.疑难解答 ···············································································································89

8.1 无法启动固件升级或者升级失败，为什么？ ··························································89

8.2 无法用浏览器打开 mylinkit.local，为什么？ ··························································89

8.2 虚拟机无法用 mylinkit.local 检测到开发板，为什么？ ··············································90

8.4 无法使用 SSH 方式访问，出现一个错误“Host Identification Has Changed”。 ·················90

8.5 附近有多个 LinkIt Smart 7688 热点时，如何确定哪一块是我的？ ································92

8.6 开发板上的 flash 非常慢，似乎损坏了，为什么？ ···················································93

8.7 为什么我的开发板由于文件系统损坏而无法启动？ ·················································93

8.8 如果开发板上的 flash 满了，如何处理？ ······························································93

8.9 为什么 I2C 设备无法运行？ ··············································································93

8.10 为什么我的开发板在驱动伺服系统时不断重启？ ··················································93

III

图表目录

表 1 MT7688AN 芯片规格 ······················································································· 5

表 2 LinkIt Smart 7688 开发板的按钮 ·········································································· 7

表 3 LinkIt Smart 7688 的 Wi-Fi LED 闪烁模式 ······························································ 7

表 4 各种情景下的典型功耗 ···················································································· 9

表 5 LinkIt Smart 7688 开发板规格参数 ······································································12

表 6 LinkIt Smart 7688 开发板的按钮 ·········································································15

表 7 典型功耗 ····································································································16

表 8 LinkIt Smart 7688 Duo 开发板规格参数 ································································19

表 9 LinkIt Smart 7688 程序设计环境概览 ···································································23

表 10 操作系统支持 ·····························································································30

表 11 Linkle Smart 7688 开发平台内含的软件包 ···························································31

表 12 Web UI 和系统控制台的配置功能 ·····································································33

表 13 LinkIt Smart 7688 UART 引脚 ···········································································38

表 14 Wi-Fi 热点加密方式 ······················································································46

表 15 文件传输工具 ·····························································································48

表 16 LinkIt Smart 7688 GPIO 引脚映射 ······································································55

表 17 MCU 和 MPU 通讯接口 ·················································································70

表 18 MPU 和 MCU 的串口引脚···············································································73

图 1 LinkIt Smart 7688 开发板（仅 MPU） ··································································· 6

图 2 拆除电阻才能使用 I-PEX 接口 ··········································································· 8

图 3 USB OTG 线 ·································································································· 9

图 4 LinkIt Smart 7688 开发板背面的 JTAG 电阻···························································10

图 5 移动电阻以范围 JTAG 模式 ·············································································10

图 6 LinkIt Smart 7688 引脚图 ··················································································13

图 7 LinkIt Smart 7688 Duo 开发板（MPU+MCU） ·······················································14

图 8 LinkIt Smart 7688 Duo 开发板背面的 JTAG 电阻 ·····················································17

图 9 移动电阻以范围 JTAG 模式 ·············································································17

图 10 LinkIt Smart 7688 Duo 引脚图 ··········································································20

图 11 LinkIt Smart 7688 开发平台的程序设计模型 ·························································23

图 12 LinkIt Smart 7688 运行在 AP 模式 ·····································································24

图 13 LinkIt Smart 7688 运行在 STA 模式····································································25

图 14 连接 Linkle Smart 7688 开发板和计算机 ·····························································33

图 15 Wi-Fi LED 状态····························································································34

图 16 连接到 LinkIt_Smart_7688 AP ··········································································34

图 17 LinkIt Smart 7688 工作在 AP 模式 ·····································································35

图 18 LinkIt Smart 7688 Web UI 登录 ·········································································35

图 19 使用 Windows PuTTY 的 SSH ··········································································36

图 20 PuTTY 安全警告 ··························································································37

图 21 系统控制台 ································································································37

图 22 使用 USB 转串口线的 LinkIt Smart 7688 端口号 ···················································38

图 23 使用 USB 转串口线和 Windows 终端访问系统控制台 ············································39

图 24 固件升级按钮 ·····························································································41

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