VM Labs SDK Sample Code |
\vmlabs\sample\File-Server\fileio |
Copyright © 2000-2001 VM Labs, Inc. All Rights Reserved |
March 2, 2001 |
This program demonstrates the use of the file server function of the MLOAD tool. It uses standard C library functions to open a file, read the contents, and then print a portion back to the host PC's console. Using similar techniques, your programs can also create files and write to them, and this will be a useful debugging technique.
Filename | Description |
fstest.c | Main program code for sample. |
makefile | MAKEFILE for building and running sample program. |
On the NUON development system, known as the "client", your programs calls functions in standard C library for performing file access. In the library, these calls are then translated into messages sent over the TCP/IP connection to your host PC.
On the PC side, the file server is one of two separate items:
The plan is that a future version of the PUFFIN debugger will also have the file server built into it.
When you run the file server on the PC side, it tells the client that the file server is available so that it knows what TCP/IP address to use when making requests.
When the file server receives a message from the client, it performs whatever file operation was requested and then sends the appropriate information back to the client.
The STDOUT and STDIN file streams are both directed to the PC console, so you can use it for character-based input and output.
Please note that while you might otherwise successfully use more than one PC to transfer data to your
NUON system, this will only confuse things when using the file server. Stick to one server per client.
Also remember that using standard C library functions to read data from your host PC is something that will only work on a development system. Final production code must use the Media Access Library
functions that are part of the BIOS. Therefore it is highly recommended that you encapsulate your data access routines into a few functions within a single module so that you may change things more easily when the time comes.
Before attempting to load or run any of the SDK samples, make sure you have first read the Hitchhiker's Guide To NUON document.
After that, if you're still having trouble getting this sample program to work, click here to request assistance from developer support.