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W321/341 Linux Software Manual

Eleventh Edition, May 3 201

www.moxa.com/product

W321/341 Linux Software Manual

The software described in this manual is furnished under a license agreement and may be used only in accordance with

the terms of that agreement.

Trademarks

The MOXA logo is a registered trademark of Moxa Inc.

All other trademarks or registered marks in this manual belong to their respective manufacturers.

Disclaimer

Information in this document is subject to change without notice and does not represent a commitment on the part of

Moxa.

Moxa provides this document as is, without warranty of any kind, either expressed or implied, including, but not limited

to, its particular purpose. Moxa reserves the right to make improvements and/or changes to this manual, or to the

products and/or the programs described in this manual, at any time.

Information provided in this manual is intended to be accurate and reliable. However, Moxa assumes no responsibility for

its use, or for any infringements on the rights of third parties that may result from its use.

This product might include unintentional technical or typographical errors. Changes are periodically made to the

information herein to correct such errors, and these changes are incorporated into new editions of the publication.

Technical Support Contact Information

www.moxa.com/support

Moxa Americas

Toll

- 1- - - free: 888 669 2872

Tel:

- - -+1 714 528 6777

Fax:

- - -+1 714 528 6778

Moxa China (Shanghai office)

Toll

- - - free: 800 820 5036

Tel:

- - - +86 21 5258 9955

Fax:

- - -+86 21 5258 5505

Moxa Europe

Tel:

- - -0 +49 89 3 70 03 99

Fax:

- - -+49 89 3 70 03 99 99

Moxa Asia

-Pacific

Tel:

-2- - +886 8919 1230

Fax:

-2- -+886 8919 1231

Table of Contents

1. Introduction ...................................................................................................................................... 1-1

Overview ........................................................................................................................................... 1-2

Software Architecture .......................................................................................................................... 1-2

Journaling Flash File System (JFFS2) ............................................................................................. 1-3

Software Package ........................................................................................................................ 1-4

2. Getting Started.................................................................................................................................. 2-1

Accessing the W321/341 Using a PC ..................................................................................................... 2-2

Serial Console ............................................................................................................................. 2-2

SSH Console ............................................................................................................................... 2-2

Configuring the Ethernet Interface ........................................................................................................ 2-3

Modifying Network Settings with the Serial Console ......................................................................... 2-3

Temporarily Modifying Networking Configurations ............................................................................ 2-4

Configuring the WLAN ......................................................................................................................... 2-4

Using WPA_SUPPLICANT to configure WPA2 ................................................................................... 2-5

SD Slot and USB for Storage Expansion ............................................................................................... 2-11

Test Program Developing Hello.c— ....................................................................................................... 2-13

Installing the Tool Chain (Linux) .................................................................................................. 2-13

Checking the Flash Memory Space ............................................................................................... 2-13

Compiling Hello.c ...................................................................................................................... 2-14

Uploading and Running the “Hello” Program ................................................................................. 2-14

Developing Your First Application ........................................................................................................ 2-15

Testing Environment .................................................................................................................. 2-15

Compiling tcps2.c ...................................................................................................................... 2-15

Uploading and Running the “tcps2-release” Program ...................................................................... 2-16

Testing Procedure Summary ....................................................................................................... 2-17

3. Managing Embedded Linux ................................................................................................................ 3-1

System Version Information ................................................................................................................. 3-2

System Image Backup ......................................................................................................................... 3-2

Upgrading the Firmware ............................................................................................................... 3-2

Loading Factory Defaults .............................................................................................................. 3-5

Enabling and Disabling Daemons .......................................................................................................... 3-5

Setting the Run- Level.......................................................................................................................... 3-7

Adjusting the System Time .................................................................................................................. 3-8

Setting the Time Manually ............................................................................................................ 3-8

NTP Client .................................................................................................................................. 3-8

Updating the Time Automatically ................................................................................................... 3-9

Cron— Daemon to Execute Scheduled Commands ................................................................................. 3-10

Connecting Storage Peripherals .......................................................................................................... 3-11

4. Managing Communications 4-1...............................................................................................................

FTP ................................................................................................................................................... 4-2

SFTP ................................................................................................................................................. 4-2

DNS .................................................................................................................................................. 4-2

IPTABLES 4-3..........................................................................................................................................

NAT .................................................................................................................................................. 4-7

NAT Example .............................................................................................................................. 4-8

Enabling NAT at Bootup ............................................................................................................... 4-8

Dial PPP-up Service— ........................................................................................................................... 4-9

PPPoE .............................................................................................................................................. 4-12

NFS (Network File System) ................................................................................................................ 4-14

Setting up the W321/341 as an NFS Client ................................................................................... 4-14

SNMP .............................................................................................................................................. 4-14

OpenVPN ......................................................................................................................................... 4-16

5. Tool Chains for Application Development .......................................................................................... 5-1

Linux Tool Chain ................................................................................................................................. 5-2

Steps for Installing the Linux Tool Chain ........................................................................................ 5-2

Compilation for Applications .......................................................................................................... 5-2

6. Programmer's Guide 6-1.........................................................................................................................

Flash Memory Map .............................................................................................................................. 6-2

Device API ......................................................................................................................................... 6-2

RTC (Real Time Clock) ......................................................................................................................... 6-2

Buzzer ............................................................................................................................................... 6-2

WDT (Watch Dog Timer) ...................................................................................................................... 6-3

Digital Input/Output(W321 only) .......................................................................................................... 6-6

Application Programming Interface ................................................................................................ 6-6

DI/DO Program Makefile Example ................................................................................................ 6-10

UART 6-.............................................................................................................................................. 11