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- 30.3.2013/Kustaa Nyholm
- README.TXT for USB CDC ACM v 1.1 for PIC18F4550
- This is a self contained example code that implements
- a USB CDC ACM aka Virtual Serial Port.
- Brought up to date and improved thanks to Ron Musgrave's
- pestering, thank's Ron, I enjoyed the whole process.
- As delivered the main program reads characters sent
- to the virtual serial port (COMn on Windows, /dev/ttyACM0
- on Linux and /dev/tty.tty.usbmodem1411 on Mac OS X, exact names
- may vary) and sends back the decimal value of the ASCII
- character sent to the terminal. In other words if you do
- for example on Mac OS X Terminal:
- screen /dev/tty.tty.usbmodem1411
- and type 'hello' you should see on the screen:
- Wellcome!
- 104
- 101
- 108
- 108
- 111
- (The 'Wellcome' text will only appear the first time
- you try this after pluging in the device).
- This version (1.1) compiles with SDCC 3.2.0 and supports
- the optional GET_LINE_CODING CDC ACM message without
- which some overzealous Windows software things the
- COM port is not working.
- This version has been tested on Mac OS X 10.8.2 and
- Ubuntun 9.04 with 'screen' and on Windows XP (SP2)
- and Windows 7 Ultimate 32 bit with 'putty' 0.62,
- Tera Term Pro 2.3 and HyperTerminal Private Edition 7.0.
- The code works with PIC18F4550 with 4 MHz Xtal.
- The Makefile has some hardcoded paths that are specific
- to my installation because I need to maintain several
- parallel SDCC installations. You need to modify those
- to suit your installation.
- For standard SDCC installation it probably is enough to
- change SDCC setting to:
- SDCC = /usr/local/bin/sdcc
- and remove from the SDCCFLAGS setting this:
- -L /Users/nyholku/sdcc-3.2.0/share/sdcc/non-free/lib/pic16
- have not tested that though.
- The Makefile calls script 'load' which expects to find
- 'pk2cmd' on the PATH (augmented in the Makefile) and
- which of course assumes that a PICKit2 is available.
- The code was developed on Mac OS X so may need some
- tweaking to get the compiling to work on other operating
- systems.
- All Linux and Windows testing was performed under
- Parallels Desktop 7.0.15107.
- Thats all folks, Kusti
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