Ajith KP MediaTek Labs

How to develop advanced smart home applications using MediaTek LinkIt™ 7688

What’s there in the Box ?

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• LinkIt Smart 7688 Introduction • Hardware Development Kit • Software Development Tools

• Demo • Peripheral Programming

• Demo • Q & A

MediaTek Labs™ A Developer Centric Ecosystem

▪ Free global program

▪ One Stop Solution

▪ Supporting developers:

• Device creation

• App development

▪ labs.mediatek.com

Enabling Developer & Maker Success

labs.mediatek.com SDKs Technical docs HDKs

Discussion Forums, FAQ & Dev Support

Newsletter Solutions Catalog

Partner Connect

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What is MediaTek LinkIt™ Smart 7688 ?

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▪ Open source WiFi platform

▪ Runs Openwrt Linux

▪ Two versions of HDKs

▪ Multiple Programming Options

What you can do with 7688 ?

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MediaTek LinkIt™ Smart 7688 Platform

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SOC :MT7688AN Highly Integrated compact SOC for IoT Devices with WiFi connectivity

SDTs: LinkIt Smart 7688 • OpenWRT • Python & Node.JS • Board support package for Arduino IDE

HDKs : LinkIt Smart 7688 • LinkIt Smart 7688 with MT7688 MPU • LinkIt Smart 7688 Duo with MT7688 MPU + MCU

MEDIATEK LINKIT™ SMART 7688 PLATFORM : SOC 7688AN DETAILS

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LinkIt Smart 7688 : SOC MT7688AN

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▪ 1T1R 802.11 b/g/n Wi-Fi radio

▪ 580MHz MIPS 24KEc CPU

▪ RAM: 128MB DDR2

▪ Flash: 32MB

▪ USB2.0 host, SD-XC, I2S/PCM, I2C, PWM, UART, GPIO, SPI, SPI-slave

▪ eMMC, PCIe are also supported in MT7688 SoC

▪ Max RAM/Flash supported in MT7688 is

▪ RAM: 256MB

▪ Flash: 64MB

MEDIATEK

MT7688AN

MEDIATEK LINKIT™ SMART 7688 PLATFORM : Hardware Development Kit ( HDK)

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LinkIt Smart 7688 : HDK

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LinkIt Smart 7688 Duo LinkIt Smart 7688

Two type of HDKs : LinkIt Smart 7688 and LinkIt Smart 7688 Duo

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LinkIt Smart 7688

• MT7688

• 128MB DDR2

• 32MB Flash

• Chip Antenna (default)

• IPEX Ext Antenna

• microSD

• USB Host

• JTAG

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LinkIt Smart 7688 Duo

• MT7688 + ATmega32U4

• 128MB DDR2

• 32MB Flash

• Chip Antenna (default)

• IPEX Ext Antenna

• microSD

• USB Host

• JTAG

MEDIATEK LINKIT™ SMART 7688 PLATFORM : Software Development Tools ( SDT)

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LinkIt Smart 7688 SDTs

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LinkIt Smart 7688 Platform runs OpenWrt (Chaos Calmer) Linux OS & loaded with range of packages to enable the development of IoT device software

You can create applications using

Duo only

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▪ OpenWrt (Chaos Calmer) • Built-in OPKG

▪ SSH

▪ Python

▪ Node.js

▪ Firmata

▪ Bridge (from Arduino Yun)

▪ Libmraa (also UPM)

▪ OpenSSL (w/ TLS 1.2)

▪ mDNS

▪ AVRdude (Arduino ICSP)

▪ UVC Webcam support

▪ git

▪ Samba

Software Specification

• BSP related ▪ Ethernet, USB, I2C, UART, GPIO, SPI driver verification

▪ Pin configuration based on HW definition

▪ GPIO control for bypass Bootstrap-pin (LinkIt Smart 7688)

▪ Reset Button Behavior

▪ Wi-Fi Status indicator

▪ Linux Console on UART2

▪ Firmware upgrade by USB (in boot loader)

▪ PWM, I2S driver

▪ Mac80211 Wi-Fi Open source driver (under development)

▪ Will use WCN binary Wi-Fi driver currently

• Setups ▪ Web UI for Initial Setup (Customized UI)

▪ AP Configure File

▪ Pre-defined MenuConfig for required features

▪ Arduino IDE SSH flashing

OpenWrt

▪ Linux distribution focus on embedded devices

• Started from 2004

• Typically wireless router

• Full-featured, easily modifiable OS for routers

▪ A framework to build network applications

• Free from the restriction and configuration provided by the vendor

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Supported Programming Language

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Language Tools & Libraries Applications Host Platform

C/C++ Cross Compilation Tool Chain

• System Programming • OS X • Linux

Python Python runtime on Linkit Smart 7688

• Prototyping • Network • IoT application

• OS X • Linux • Windows

Node.js Node.js runtime on LinkIt Smart 7688

• Prototyping • Network • IoT application

• OS X • Linux • Windows

Demo

▪ Connect to LinkIt Smart 7688 AP

▪ Log in using WebUI

▪ Login using Putty

▪ Login & transfer file using SCP Tool

▪ Show Openwrt

▪ OPKG Packages

▪ Change to station mode to access Internet

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MEDIATEK LINKIT™ SMART 7688 PLATFORM : Peripheral Programming

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Wi-Fi

MT7688

Har

dw

are

Sensors

USB Device/SD

Peripheral Connections in LinkIt Smart 7688

OpenWrt

LinkIt Smart 7688 : Hardware Architecture

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Soft

war

e

libmraa

Python Node.js

UPM

App Logic

OpenWrt

Sensors

C

How can I access sensors from LinkIt Smart 7688 ?

libmraa: C/C++ library with bindings to JavaScript & Python for I/O interface in Linux

UPM : A set of sensor drivers written in libmraa

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Basic concepts of MRAA

In MRAA, hardware modules such as GPIO, UART, SPI, and PWM are represented as objects

Libmraa is a C/C++ library to interface with the peripheral on LinkIt Smart 7688

import mraa pin = mraa.Gpio(44) pin.dir(mraa.DIR_OUT) pin.write(1)

Import mraa pin = mraa.Pwm(18) pin.period_ms(2) pin.enable(True) pin.write(0.25) # set duty cycle

import mraa i2c = mraa.I2c(0) i2c.address(0x53) if 0xE5 == i2c.readReg(0x00): print "Grove - 3-Axis Digital Accelerometer found on I2C Bus" else: print "Grove - 3-Axis Digital Accelerometer not found"

GPIO PWM

I2C

Demo

▪ Login to 7688 using Putty

▪ Connect to LinkIt Smart 7688

▪ Code walk through mraa python examples • Simple blink using mraa

• Accelerometer eg using UPM

▪ Code walk through Node.js

▪ Control LED from MCS

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Peripheral Connections in LinkIt Smart 7688 Duo

MT7688 ATMega32U4

UART

USB Device/SD

Sensors

Wi-Fi

Har

dw

are

OpenWrt

Arduino

LinkIt Smart 7688 Duo : Hardware Architecture

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How can I access sensors from LinkIt Smart 7688 Duo ?

3 Programming Models for LinkIt Smart Duo

Primitive UART Connection

Firmata Protocol Arduino Yun Bridge

Library

Peripheral Programming : Option-1

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Soft

war

e

Python Node.js

UART port

Sensor Drivers

UART Library

App Logic

OpenWrt

Arduino

Sensors

C

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Soft

war

e Firmata

Python Node.js

Sensors

Firmata

App Logic

OpenWrt

Arduino

C

Peripheral Programming : Option-2

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Soft

war

e

Sensors

Bridge Library

Sensor Drivers

Bridge Library

App Logic

(MPU provides Wi-Fi & USB Host / SD)

OpenWrt

Arduino

Peripheral Programming : Option-3

Summary : LinkIt Smart 7688 Vs Duo

Python Node.js

Sensors

Firmata

Python Node.js

Sensors

UART port

Sensor Drivers

UART Library

App Logic App Logic

Sensors

Bridge Library

Sensor Drivers

Bridge Library

App Logic

(MPU provides Wi-Fi & USB Host)

libmraa

Python Node.j

s

upm

Sensors

App Logic

Sensors

USB Device/SD

LinkIt Smart 7688

Wi-Fi

MT7688 MT7688 ATMega32U4

UART

USB Device/SD

Sensors

LinkIt Smart 7688 Duo

OpenWrt OpenWrt OpenWrt

OpenWrt

Arduino Arduino Arduino

Har

dw

are

Wi-Fi

Soft

war

e

MPU (MT7688) with OpenWrt as Host MCU (ATmega32U4) with Arduino as Host

Linux Developers

Arduino Developers

(default)

C C C

Firmata

Demo

▪ Login to 7688 using Putty

▪ Start camera app

▪ Show 3 scenarios with Duo

▪ Upload Arduino Firmata Sketch

▪ Run python code in Linux side and communicate with Arduino

▪ Run Node.js and control lights using browser high/low

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580 Mhz CPU

128MB RAM

Bread Board

FF

Python Node.j

s

32MB FLASH

USB HOST & SD-

XC

RICH I/O

Interface Fully

Open source

LinkIt Smart 7688 Advantages

Target Audience

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IoT Gateway Device Developers

OpenWRT Community

Python Developers

Node.Js Developers

Robotics Community Arduino Yun Community

LinkIt Smart 7688 Testimonials

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“I have recently decided to learn embedded Linux, and have bought over 14 different development kits. Though they all run Linux, they all have their pros and cons. So far out of all of them I have liked the MediaTek LinkIt Smart 7688 the best,” Mike Moy, Sr. Design Engineer, Versamodule.com

How can I get it ?

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Online Order : http://www.seeed.cc/linkit_smart_7688/

Need more info ?

Documentation

• Get Started Guides

• Developer’s Guides

• Tutorials & Forums

• HDK information Datasheet

Schematic

Layout

Pin-out Diagram

Toolchains

Bootloader

• Source codes hosted on Labs’ repository

Firmware

• Source codes hosted on OpenWrt.org

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labs.mediatek.com

Questions?

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Download Resources:

labs.mediatek.com/7688

MediaTek Cloud Sandbox:

labs.mediatek.com/mcs

Check the Forum:

labs.mediatek.com/forums

Copyright © MediaTek Inc. All rights reserved. 38

QUESTIONS…?

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