Serial IO focusing

Fergus Henderson fjh@cs.mu.OZ.AU
Fri Aug 22 04:06:00 GMT 1997


mark koi, you wrote:
> I had a program under DOS which controlled a serial port using a polling
> 
> method.  Now I am trying to use gnu-win32, and I see no libraries for
> things like outp(), inp().

I think you probably just need to define these using inline assembler.

#define outb(value, port) \
  ({ __asm__ __volatile__ ("outb %b0,%w1"::"a" (value), "d" (port)); })

#define inb(port) \
  ({ char _v; \
      __asm__ __volatile__ ("inb %w1,%0":"=a" (_v):"d" (port)); \
      _v; \
  })

However, I haven't tried this...
I don't know if Windows allows direct access to I/O ports like this.
You might have to write a Windows device driver (VxD).

-- 
Fergus Henderson <fjh@cs.mu.oz.au>   |  "I have always known that the pursuit
WWW: < http://www.cs.mu.oz.au/~fjh >   |  of excellence is a lethal habit"
PGP: finger fjh@128.250.37.3         |     -- the last words of T. S. Garp.
-
For help on using this list (especially unsubscribing), send a message to
"gnu-win32-request@cygnus.com" with one line of text: "help".



More information about the Cygwin mailing list