Mail Archives: cygwin/2000/09/28/22:40:12
> How can I access the parallel port in cygwin under win2000 or win98?
Under win98 (aka DOS), anyone can get unrestricted access the the IO ports of
the board using code such as:
static inline int win9x_inportb( int port )
{
unsigned char value;
__asm__ volatile ("inb %1,%0"
: "=a" (value)
: "d" ((unsigned short)port));
return value;
}
static inline void win9x_outportb( unsigned short int port, unsigned char val )
{
__asm__ volatile (
"outb %0,%1\n"
:
: "a" (val), "d" (port)
);
}
Under Win2k (aka WinNT), it is more involved, you need to use a device
driver to do the work, and you just use function calls to this device driver
to do the actual port IO. I have used the MMP library (which gives access to
the entire IO space and memory, and therefore is not really secure).
MMP lives at: http://www.einev.ch/references/mondada/mmp/
There is many others though which are perhaps a bit safer, try:
http://www.lvr.com/
for links to a few other libraries (under the parallel port section)
===============================================================================
Peter Eccles
Computer Systems Engineering (4th year)
RMIT Melbourne Australia
email: petere AT connexus DOT net DOT au
===============================================================================
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