There are several parallel port monitor-type programs available on the Internet (I know because I was just doing some research on them). A good place to start might www.lvr.com. This might save you the effort of building an entire project... Douglas Wood Software Engineer dbwood@kc.rr.com Home of the EPICIS Development System for the PIC and SX http://epicis.piclist.com ----- Original Message ----- From: "Wojciech Zabolotny" To: Sent: Friday, August 10, 2001 6:06 AM Subject: [EE]: [PIC]: PIC based EPP protocol monitor... > Hi All, > > I need to reverse engineer the communication protocol used > by a LPT connected scanner (the firm refuses to release > the documentation necessary for writing a Linux driver :-( ). > Therefore I need to build a SPP/EPP/ECP monitor, to be connected > paralelly with the scanner, which will send the acquired data to the > another PC (via USB or EPP) > I think that it can be done with (maybe slightly overclocked) PIC > (16F877 or 16C745 with USB?). > > I'd be glad to hear some suggestions: > 1) Is it possible to overclock 16F877 2 times? Has anybody the experiences > with such configuration? > 2) Is it possible to build a SIMPLE circuit detecting the "transmitting" > and "receiving" side of the LPT link? (Yes I know that it should be > possible to determine it from the control lines, but I suspect that > the protocol may be slightly different from the IEEE1284 specs). > 3) Maybe someone know about a PIC/other projects which could be adapted > for that purpose. (I even considered writing the VHDL code for > implementation of such monitor on FPGA...) > -- > > TIA & Regards, > Wojciech Zabolotny > wzab@ise.pw.edu.pl > > -- > http://www.piclist.com hint: PICList Posts must start with ONE topic: > [PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads > > -- http://www.piclist.com hint: PICList Posts must start with ONE topic: [PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads