Problem about parallel port!

Problem about parallel port!

[º£¶«]

    How can I access the parallel port in cygwin under win2000 or win98? 
                                                                   y.h.d@263.net


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Re: Problem about parallel port!

[Peter J Eccles]

>    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@connexus.net.au
===============================================================================


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