User`s manual

UC-7402 User’s Manual Getting Started
2-13
RTSThreshold—Sets the RTS threshold
Setting
1 to 2347
FragThreshold—Sets the fragment threshold
Setting
256 to 2346
Test Program—Developing Hello.c
In this section, we use the standard “Hello” programming example to illustrate how to develop a
program for UC-7402. In general, program development involves the following seven steps.
Step 1:
Connect UC-7402 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 UC-7402 Via 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 UC-7402 units if needed).
x86
Cross
Compiler
Installing the Tool Chain (Linux)
The PC must have the Linux Operating System pre-installed before installing the UC-7402 GNU
Tool Chain. Redhat 7.3/8.0, Fedora core, and compatible versions are recommended. The Tool
Chain requires about 100 MB of hard disk space on your PC. The UC-7402 Tool Chain software is
located on the UC-7402 CD. To install the Tool Chain, insert the CD into your PC and then issue
the following commands:
#mount /dev/cdrom /mnt/cdrom
#rpm –ivh /mnt/cdrom/tool-chain/Linux/mxscaleb-x.x.x-x.i386.rpm
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 ToolChain files, including
the compiler, link, library, and include files are located in this directory.
PATH=/usr/local/mxscaleb/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.