ICP DAS USA PCI-P16C16 - Manual (Page 29)

4 . I/O Control Register
The First 16 double words of a PCI device's configuration space is referred
to as the device's configuration region. Within these the 16 (0-15) double words,
the 04, 05, 06, 07, 08 and 09 double words are referred to as Base Address0,
Base Address1, Base Address2, Base Address3, Base Address4 and Base
Address5. For more detailed information for about these 16 double words,
please referring the book titled PLUG AND PLAY SYSTEM
ARCHITECTURE(written by Tom Shanley, Addison-Wesley Publish Company,
1995). These base addresses are utilized as control register and/or I/O register
for many data acquisition boards. On PCI-P16R16 and PCI-P8R8 boards, the
base address2 is utilized as the base address of digital in and digital out. So the
Digital I/O functions for PCI-P16R16 and PCI-P8R8 are coded as follows:
#define WORD unsigned int
#define UCHAR unsigned char
void P16R16_DO(WORD BaseAddr, WORD wOutData)
{
outport(BaseAddr,wOutData);
}
WORD P16R16_DI(WORD BaseAddr)
{
WORD
DigitalIn;
DigitalIn=inport(BaseAddr);
return DigitalIn;
}
void P8R8_DO(WORD BaseAddr, WORD wOutData)
{
outportb(BaseAddr,wOutData);
}
UCHAR P8R8_DI(WORD BaseAddr)
{
UCHAR DigitalIn;
DigitalIn=inportb(BaseAddr);
return DigitalIn;
}
PCI-P8R8/P16R16/P16C16/P16POR16 User’s Manual (Ver.2.2, 2005/5/5) … 29