NCR RealPOS 70 - Page 262

12-22 Chapter 12: Cash Drawer Interface
g_hPortDrvr, // Handle to device
(LPSTR) &gpioport,
(DWORD) 4, // Length of buffer in bytes
&DataRead, // bytes read
NULL ) == FALSE ) ) // NULL means wait till I/O completes.
{
gpioport = 0; //Read failed
DWORD hr = GetLastError();
result = FALSE;
return result;
}
} // end if WriteFile(...)
gpioport &= 0x0FFC0; // strip resource indicator
m_nIOPort_select = (WORD)gpioport+uc_gpsel_offset; // GP Sel Base
address from GPIO Base Register
m_nIOPort = (WORD)gpioport+uc_gp_offset; // GPO Base address from GPIO
Base Register
nUsePort = (WORD)gpioport+uc_gpuse_offset;
} // m_bPortDrvr
} //NT
// End Read Configuration Register
if ( result )
{
if ( (m_nIOPort == 0) || (m_nIOPort_select == 0) )
{
result = FALSE;
}
else
{
DWORD sBytes =0;
// Read USE select register
if ( ReadIOPort(&sBytes, nUsePort) )
{
sBytes = sBytes | CD7402USE_GPIO; //35:32 bits as GPIO
// write new USE
result = WriteIOPort( sBytes, nUsePort );
}
else
result = FALSE;
// Read select register
if (( ReadIOPort(&sBytes, m_nIOPort_select) ) && result)
{