Dear All, I am engaged in creating a progran to test the embeded linux system during production. Now my problem is how can test the parallel port without other device (printer, pc ,etc). I hope to have a simple circuit connected to the port and build a user program to send some data and recieve it by iteself.
Somebody is expexried with this and help with that?
Bill Zhao
Check out a book by Craig Hollabaugh called, "Embedded Linux; Hardware, Software and Interfacing". It's also covered in a number of O'Reilly books on Linux programming.
Google might be worth a try also...
found this...
Hallo Bill,
Bill Zhao schrieb:
You can build a small testsocket with a microprocessor which takes all
256 bit combinations as testpattern and replys by acking or e.g raising "out of paper". This would be a 10-20$ device, not including development :-).Regards, Kurt
Kurt Harders ??:
there some materials about this kind of device? I never seen it.
Its not an existing device. Depending on the quantity you have to check it may be a reasonable device to build. If you want me to do that please ask.
Regards, Kurt
Kurt Harders pravi:
You probably wanna also print like /dev/null but faster to make a quicktest. Here is a description and a schema of testing dummy I used ten years ago on (now dumped) Am286. It was made from connector, wire and a LED. This was somehow tested on prehistoric 286 and it may fit for your needs.
Leave all unused lines in the air (=not connected, i.e. undefined) to leave them on defaults. You may connect other lines together if you wish
- but you test your PC then. You might want to put a LED (4.7V LED) on anyone of data lines between GND to have lightshow for better interpretation. You might also want to connect to ground through a small capacitor of 10nF or a resistor of 4KE which was not originally used.
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