Moxa Technologies 331 User Manual download pdf (Page 61)

Moxa C Programmable RTU Controllers Tool Chains for Application Development

5-3

Moxa provides cross compiler tools for the following native compilers. Simply add the “arm-linux-” prefix.

ar Manages archives (static libraries)

as Assembler

c++, g++ C++ compiler

cpp C preprocessor

gcc C compiler

gdb Debugger

ld Linker

nm Lists symbols from object files

objcopy Copies and translates object files

objdump Displays information about object files

ranlib Generates indexes to archives(static libraries)

readelf Displays information about ELF files

size Lists object file section sizes

strings Prints strings of printable characters from files (usually object files)

strip Removes symbols and sections from object files (usually debugging information)

On-Line Debugging with GDB

The tool chain also provides an on-line debugging mechanism to help you develop your program. Before

starting a debugging session, add the option -ggdb when you compile the program. A debugging session runs

on a client-server architecture on which the server gdbserver is installed on the target system and the client

ddd is installed on the host computer. In the following instructions, we assume that you have uploaded a

program named hello-debug to the target system and wish to debug this program.

1. Log on to the target system and run the debugging server program.

#gdbserver 192.168.4.142:2000 hello-debug

Process hello-debug created; pid=38

This tells the debugging server to listen for connections on network port 2000 of the network interface

192.168.4.142 of the target system. The name of the program to be debugged is indicated after the

network port. Additional arguments can be added after the program name as needed.

2. In the host computer, switch to the directory that contains the program source.

cd /my_work_directory/myfilesystem/testprograms

3. Execute the client program.

#ddd --debugger arm-linux-gdb hello-debug &

4. Enter the following command at the GDB, ddd command prompt.

>> target remote 192.168.4.142:2000

The command produces a line of output on the target system console, similar to the following.

Remote debugging using 192.168.4.99:2000

192.168.4.99 is the host PC’s IP address, and 2000 is the port number. You can now begin debugging in the

host environment using the interface provided by ddd.

5. Set a break point in the main function by double clicking or entering b main on the command line.

6. Click the cont button.

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Moxa Technologies 331 User Manual Page 61