Purpose: set/get extended parameters (20022, 20020C only)
Parameter:
IN: struct ARCNET_EXTND (declared in FARC.H)
OUT: struct ARCNET_EXTND
Comment:
Should be performed before doing a IOCTL_FARC_INIT !
The function returns the previously set values.
New values only take effect by performing a IOCTL_FARC_INIT
Possible errors (see also Error codes):
E_FARC_INVALID_HANDLE
E_FARC_BUFFER_TOO_SMALL
Example:
Note, that the following example is only a fragment. It is recommended,
that the driver is opened in asynchronous mode and a handle to the driver
is available.
OVERLAPPED overlapped;
DWORD read, err;
BOOL ret;
ARCNET_EXTND extnd_new, extnd_old;
overlapped.Offset = 0;
overlapped.OffsetHigh = 0;
overlapped.hEvent = CreateEvent(NULL,TRUE,FALSE,NULL);
...
// Set Clock multiplier of 20020C
// new baudrate: 5 Mpbs
extnd_new.z_ckup_0 = 1;
extnd_new.z_ckup_1 = 0;
extnd_new.z_receiveall = 0;
ret = DeviceIoControl(drvhandle,
IOCTL_FARC_EXTND_FUNCTIONS,
&extnd_new,
sizeof(extnd_new),
&extnd_old,
sizeof(extnd_old),
&read,
&overlapped);
if (!ret)
{
err = GetLastError();
if (err == E_FARC_PENDING)
{
ret
= GetOverlappedResult(drvhandle, &overlapped, &read, TRUE);
if
(!ret)
{
err = GetLastError();
// do errorhandling here
}
}
else
{
//
other error occured, perhaps wrong handle
}
}
// Now do DeviceIoControl(..., IOCTL_FARC_INIT,
...)
...