A/D conversion problem with 18F2455

[abdy37]

So what you're saying is that you want your PC to talk to your PIC, bidirectionally.
What port do you want to use on the PC to do this? The speaker/microphone port?
You know there's fully functional serial port on the PIC18F2455, as well as most others, that is easily used to communicate with a PC, with a little bit of extra hardware. See the PBP book for more details...

I am looking forward to use USB communication for that. Because the main part of the project is USB.

[skimask]

I am looking forward to use USB communication for that. Because the main part of the project is USB.

But why do you need to use the ADC of the PIC to talk to the PC?
Do a search on 'USBDemo'