ThinkCore W311/321/341 Linux User’s Manual Getting Started

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Test Program—Developing Hello.c
In this section, we use the standard “Hello” programming example to illustrate how to develop a
program for the W311/321/341. In general, program development involves the following seven
steps.
Step 1:
Connect the W311/321/341 to a Linux PC.
Step 2:
Install Tool Chain (GNU Cross Compiler & glibc).
Step 3:
Set the cross compiler and glibc environment variables.
Step 4:
Code and compile the program.
Step 5:
Download the program to the W311/321/341 using FTP
or NFS.
Step 6:
Debug the program
Æ If bugs are found, return to Step 4.
Æ If no bugs are found, continue with Step 7.
Step 7:
Back up the user directory (distribute the program to
additional W311/321/341 units if needed).
x86
Cross
Compiler

Installing the Tool Chain (Linux)

The Linux Operating System must be pre-installed in the PC before installing the W311/321/341
GNU Tool Chain. Fedora core or compatible versions are recommended. The Tool Chain requires
approximately 100 MB of hard disk space on your PC. The W311/321/341 Tool Chain software is
located on the W311/321/341 CD. To install the Tool Chain, insert the CD into your PC and then
issue the following commands:
#mount /dev/cdrom /mnt/cdrom
#sh /mnt/cdrom/tool-chain/linux/install.sh
The Tool Chain will be installed automatically on your Linux PC within a few minutes. Before
compiling the program, be sure to set the following path first, since the Tool Chain files, including
the compiler, link, library, and include files are located in this directory.
PATH=/usr/local/arm-linux/bin:$PATH
Setting the path allows you to run the compiler from any directory.
NOTE Refer to Appendix B for an introduction to the Windows Tool Chain. In this chapter, we use the
Linux tool chain to illustrate the cross compiling process.

Checking the Flash Memory Space

If the flash memory is full, you will not be able to save data to the Flash ROM. Use the following
command to calculate the amount of “Available” flash memory:
/>df –h