/*! \brief Write some bytes to the IEC bus
\param Pdx
Pointer to the device extension.
\param Buffer
Pointer to a buffer where the read bytes are written to.
\param Size
Maximum number of characters to read from the bus.
\param Written
Pointer to the variable which will hold the number of written bytes.
\return
If the routine succeeds, it returns STATUS_SUCCESS. Otherwise, it
returns one of the error status values.
ATN is released on return of this routine
*/
NTSTATUS
cbmiec_raw_write(IN PDEVICE_EXTENSION Pdx,
IN const PUCHAR Buffer, IN ULONG Size,
OUT ULONG *Written)
{
NTSTATUS ntStatus;
#if DBG
unsigned i;
#endif
FUNC_ENTER();
PERF_EVENT_VERBOSE(0x1000, 0);
FUNC_PARAM((DBG_PREFIX "Buffer = 0x%p, Size = 0x%04x", Buffer, Size));
#if DBG
for (i=0;i<Size;i++)
{
FUNC_PARAM((DBG_PREFIX " output %2u: 0x%02x '%c'", i, (unsigned int) Buffer[i], (UCHAR) Buffer[i]));
}
#endif
PERF_EVENT_VERBOSE(0x1001, 0);
ntStatus = cbmiec_i_raw_write(Pdx, Buffer, Size, Written, 0, 0);
PERF_EVENT_VERBOSE(0x1002, 0);
FUNC_LEAVE_NTSTATUS(ntStatus);
}
/*! \brief Send an UNLISTEN over the IEC bus
This function sends an UNLISTEN to the IEC bus.
\param Pdx
Pointer to the device extension.
\return
If the routine succeeds, it returns STATUS_SUCCESS. Otherwise, it
returns one of the error status values.
*/
NTSTATUS
cbmiec_unlisten(IN PDEVICE_EXTENSION Pdx)
{
NTSTATUS ntStatus;
ULONG sent;
UCHAR buffer;
FUNC_ENTER();
// send a 0x3F (unlisten) under control of ATN
buffer = 0x3f;
ntStatus = cbmiec_i_raw_write(Pdx, &buffer, 1, &sent, 1, 0);
Pdx->DoNotReleaseBus = FALSE;
FUNC_LEAVE_NTSTATUS(ntStatus);
}
/*! \brief Send a TALK over the IEC bus
This function sends a TALK to the IEC bus.
\param Pdx
Pointer to the device extension.
\param Device
Device (primary) address
\param Secaddr
Secondary address
\return
If the routine succeeds, it returns STATUS_SUCCESS. Otherwise, it
returns one of the error status values.
*/
NTSTATUS
cbmiec_talk(IN PDEVICE_EXTENSION Pdx, IN UCHAR Device, IN UCHAR Secaddr)
{
NTSTATUS ntStatus;
ULONG sent;
UCHAR buffer[2];
FUNC_ENTER();
FUNC_PARAM((DBG_PREFIX "Device = 0x%02x, Secaddr = 0x%02x", (int)Device, (int)Secaddr));
// send a 0x4x / 0x6y (talk device x, secaddr y) under control of ATN
buffer[0] = 0x40 | Device;
buffer[1] = 0x60 | Secaddr;
ntStatus = cbmiec_i_raw_write(Pdx, buffer, 2, &sent, 1, 1);
Pdx->DoNotReleaseBus = TRUE;
FUNC_LEAVE_NTSTATUS(ntStatus);
}
