![]() While USB standard is realy not that bad once you get into grips with the basics, it can be very intimidating. Most come only with USB and Etherner connections. One of the hurdless that faces anyone who wants to interface a modern PC with the real physical world is the fact that most new computers have neither a serial port nor a parallel port that could be utilized to interface with external world. ![]() The code size is less than 2500 bytes and it requires about 230 bytes of RAM memory and it is capable of transferring almost 1 MB/sec (if only the PIC could generate any data at that speed!). The code has been optimized to use minimal amout of memory (both Flash and RAM) and tuned to work well with the Free SDCC C-compiler. This page introduces a minimal firmware that implements a USB Virtual Serial Port for Microchip PIC18F4550 processor. Updated and improved thanks to Ron Musgrave's pestering, thank's Ron, I enjoyed the whole process.ĭon't forget to README.txt file for further details. Helps overzealous Windows programs like Hyperterm to work with it. I've updated the project for SDCC 3.2.0 and included support for GET_LINE_CODING which Thomas Missonier provided attached Makefile to compile the code under Windows/Cygwin and 'pic-config.h' file for use with 20 MHz crystal.
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