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Moxa IA3341-LX [53/72] Chapter 5 development tool chains

Chapter 5 Development Tool Chains

This chapter describes how to install a tool chain in the host computer that you use to develop your

applications. In addition, the process of performing cross-platform development and debugging are

also introduced. For clarity, the IA3341 embedded computer is called a target computer.

The following functions are covered in this chapter:

 Linux Tool Chain

¾ Steps for Installing the Linux Tool Chain

¾ Compilation for Applications

¾ On-Line Debugging with GDB

Содержание

First edition may 2010 1
Ia3341 linux user s manual 1
Www moxa com product 1
Copyright notice 2
Disclaimer 2
Ia3341 linux user s manual 2
Technical support contact information www moxa com support 2
Trademarks 2
Table of contents 3
Chapter 1 introduction 5
Introduction 5
Overview 6
Software architecture 6
Journaling flash file system jffs2 7
Software specifications 8
Chapter 2 getting started 9
Getting started 9
Connecting the ia3341 to a pc 10
Powering on the ia3341 10
Serial console 10
Ssh console 11
Windows users 11
Configuring the ethernet interface 12
Linux users 12
Modifying network settings with the serial console 13
Modifying network settings over the network 14
Sd socket and usb for storage expansion 14
Test program developing hello c 14
Checking the flash memory space 15
Installing the tool chain linux 15
Compiling hello c 16
Uploading and running the hello program 16
Compiling tcps2 c 17
Developing your first application 17
Ia3341 17
Pc1 pc2 17
Rs 232 lan 17
Testing environment 17
Uploading and running the tcps2 release program 18
11 2 11 19
Command to check if the tcps2 program is actually running in the background 19
From the ia3341 type 19
Ia3341 linux user s manual getting started 19
The program should start running in the background use the 19
Summary of the testing procedure 20
Chapter 3 managing embedded linux 21
Managing embedded linux 21
System image backup 22
System version information 22
Upgrading the firmware 22
Ia3341 linux user s manual managing embedded linux 23
The following instructions give the steps required to save the firmware file to the ia3341 s ram disk and how to upgrade the firmware 23
Type the following commands to enable the ram disk 23
Type the following commands to use the ia3341 s built in ftp client to transfer the firmware file ia3341 x x frm from the pc to the ia3341 23
Loading factory defaults 24
Backing up the user directory 25
Create a backup file first type the following command to enable the ram disk upramdisk next use the file system backup utility provided by moxa backupuf mnt ramdisk usrfs backup 25
Deploying the user directory to additional ia3341 units 25
For some applications you may need to ghost one ia3341 user file system to other ia3341 units back up the user file system to a pc refer to the previous subsection backing up the user file system for instructions and then type the following commands to copy the backup to additional ia3341 units 25
Ia3341 linux user s manual managing embedded linux 25
Once the file system is backed up use ftp to transfer the file usrfs backup to your pc 25
Upramdisk cd mnt ramdisk upfirm usrfs backup 25
Cd etc rc d vi rc local 26
Enabling and disabling daemons 26
Ia3341 linux user s manual managing embedded linux 26
Inetd internet daemons ftpd ftp server client daemon sshd secure shell server daemon mbat modbus daemon 26
Next use vi to open your application program we use the example program tcps2 release and set it to run in the background 26
Starting a program automatically at run level 26
The following daemons are enabled when the ia3341 boots up for the first time 26
To set a private daemon to run at run level you can edit the file rc local as follows 26
Type the command ps ef to list all processes currently running 26
Cd etc rc d init d 27
Cd etc rc d rc3 d ln s etc rc d init d tcps2 s60tcps2 27
Edit a shell script to execute root tcps2 release and save to tcps2 as an example 27
Ia3341 linux user s manual managing embedded linux 27
In this section we outline the steps you should take to set the linux run level and execute requests use the following command to enable or disable settings 27
Setting the run level 27
Sxxrunfile stands for s start the run file while linux boots up xx a number between 00 99 the smaller number has a higher priority runfile the file name 27
You will find that the following daemons are enabled after you reboot the system 27
Adjusting the system time 28
Ntp client 28
Setting the time manually 28
Cron daemon to execute scheduled commands 29
Updating the time automatically 29
Chapter 4 managing communications 31
Managing communications 31
Web service apache 32
Ia3341 linux user s manual managing communications 34
Install php for apache web server 34
Note the cgi function is enabled by default if you want to disable the function modify the file etc apache conf httpd conf when you develop your own cgi application make sure your cgi file is executable 34
Step 1 check that you have enough free space the following figure illustrates how to check that the dev mtdblock3 has more than 3 mb of free space 34
Step 2 type upramdisk to get the free space ram disk to save the package 34
This embedded computer supports the php option however since the php file is 3 mb it is not installed by default to install it yourself first make sure there is enough free space at least 3 mb on your embedded flash rom 34
Ia3341 linux user s manual managing communications 35
Step 3 download the php package from the cd rom you can find the package in cd rom target php php tgz 35
Step 4 untar the package to do this type the command tar xvzf php tgz 35
Iptables 36
Define policy for chain rules 39
Observe and erase chain rules 39
Append or delete rules 40
Nat area private ip 41
Nat example 41
12 4 12 42
Dial up service ppp 42
Enabling nat at bootup 42
Ia3341 linux user s manual managing communications 42
In most real world situations you will want to use a simple shell script to enable nat when the ia3341 boots up the following script is an example 42
Modem ppp access is almost identical to connecting directly to a network through the ia3341 s ethernet port since ppp is a peer to peer system the ia3341 can also use ppp to link two networks or a local network to the internet to create a wide area network wan 42
Note click on the following links for more information about ppp http tldp org howto ppp howto index html http axion physics ubc ca ppp linux html 42
Ppp point to point protocol is used to run ip internet protocol and other network protocols over a serial link ppp can be used for direct serial connections using a null modem cable over a telnet link and links established using a modem over a telephone line 42
The pppd daemon is used to connect to a ppp server from a linux system for detailed information about pppd see the man page 42
Example 1 connecting to a ppp server over a simple dial up connection 43
Example 2 connecting to a ppp server over a hard wired link 44
How to check the connection 44
Setting up a machine for incoming ppp connections 45
Nfs network file system 47
Setting up the ia3341 as an nfs client 48
Installing net snmp 49
20 4 20 50
Ia3341 linux user s manual managing communications 50
Step 4 type command tar xvzf net snmp tgz to untar the package 50
Step 5 run install sh and select to install the snmp daemon 50
21 4 21 51
Ia3341 linux user s manual managing communications 51
Step 6 run the command snmpd c etc snmpd snmpd conf to wake up snmp daemon 51
Step 7 use snmp client to query from target for testing 51
The following simple example allows you to use an snmpwalk program on the host site to query the ia3341 which is the snmp agent the ia3341 will respond 51
Uage like snmpwalk v 1 c public target ip 51
22 4 22 52
Ia3341 linux user s manual managing communications 52
Note click on the following links for more information about mib ii and rs 232 like groups http www faqs org rfcs rfc1213 html http www faqs org rfcs rfc1317 html the ia3341 does not support snmp trap 52
Chapter 5 development tool chains 53
Development tool chains 53
Compilation for applications 54
Linux tool chain 54
Steps for installing the linux tool chain 54
On line debugging with gdb 55
Chapter 6 programmer s guide 56
Programmer s guide 56
Before programming your embedded system 57
Caution required when using file systems 57
Device api 57
Flash memory map 57
Using a ram file system instead of a flash file system 57
Buzzer 58
Rtc real time clock 58
Wdt watch dog timer 58
Example 1 60
Example 2 60
Ia3341 linux user s manual programmer s guide 60
Special note 60
The makefile is shown below 60
User application example 60
When you kill the application with 9 or kill without option or ctrl c the kernel will change to auto ack the swatchdog 60
When your application enables the swatchdog and does not ack your application may have a logical error or your application has made a core dump the kernel will not change to auto ack this can cause a serious problem causing your system to reboot again and again 60
Description set the interface mode argument 3 mode will pass to the uart device driver and change it 61
Function moxa_set_op_mode 61
Ia3341 linux user s manual programmer s guide 61
Include moxadevice h 61
The ia3341 supports linux standard termial control the moxa uart device api allows you to configure ttym0 to ttym3 as rs 232 rs 422 4 wire rs 485 or 2 wire rs 485 ia3341 supports rs 232 rs 422 2 wire rs 485 and 4 wire rs 485 61
The makefile is shown below 61
The normal tty device node is located at 61
You must 61
Baudrate error 62
Example to get the baudrate 62
Example to set the baudrate 62
Special note 62
Application programming interface 63
Digital i o 63
1 from high to low 65
10 6 10 65
3600000 milliseconds 65
Description the program indicates to connect do1 to di1 change the digital output state to high or low by manual input then detect and count the state changed events from di1 65
Din_event_clear 1 clear this event 65
Din_event_low_to_high 0 from low to high 65
Dio program source code file example 65
Don t forget to link the library libmoxalib for di do programming and also include the header file moxadevice h the di do library only can be used by one program at a time 65
Duration the value of duration should be 0 or 40 duration 65
Examples 65
File name tdio c 65
Ia3341 linux user s manual programmer s guide 65
Output mode din_event_high_to_low 65
Return reference the error code 65
Return to the current duration value of diport 65
Special note 65
Unsigned long duration the duration of the din port is kept in high or low state 65
11 6 11 66
Ia3341 linux user s manual programmer s guide 66
12 6 12 67
Ia3341 linux user s manual programmer s guide 67
Modbus 68

Moxa IA3341-LX [53/72] Chapter 5 development tool chains

Содержание

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