Digital I/O Wildcard User Guide

#include <allqed.h>		// Include QED header files
#define DIRECTION_REGISTER	0xC005
#define NIBBLE_0	1	// Lines 0-3
#define NIBBLE_1	2	// Lines 4-7
#define NIBBLE_2	4	// Lines 8-11
#define NIBBLE_3	8	// Lines 12-15
#define OUTPUT	1
#define INPUT	0
void Init_IO_Direction ( uchar module_number, uchar nibble, uchar direction )
// Valid module numbers are 0-7. Valid nibbles are NIBBLE_0 to NIBBLE_3
// Valid directions are INPUT or OUTPUT.
// ------------------------------------------------------------------------
// The module number depends on the module select jumpers. See Table 1 for
// the jumper settings and associated addresses.
// ------------------------------------------------------------------------
// No error checking is done on the input parameters!
// ------------------------------------------------------------------------
// This routine initializes the direction of a nibble of I/O lines on the
// Digital I/O Wildcard.
{
EXTENDED_ADDR module_addr;
module_addr.sixteen_bit.page16 = module_number;
module_addr.sixteen_bit.addr16 = DIRECTION_REGISTER;
if(direction)
{
SetBits( nibble, module_addr.addr32 ); // set nibble as output
}
else
{
ClearBits( nibble, module_addr.addr32 ); // set nibble as input
}
}