PI8042_SYNCH_WRITE_PORT - NtDoc
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headers
// ntdd8042.h
PI8042_SYNCH_WRITE_PORT Pi8042SynchWritePort;
NTSTATUS Pi8042SynchWritePort(
[in] PVOID Context,
[in] UCHAR Value,
[in] BOOLEAN WaitForACK
)
{...}
View the official Windows Driver Kit DDI referenceNo description available.
The PI8042_SYNCH_READ_PORT-typed callback routine does a synchronized write to an i8042 port. I8042prt supplies this routine.
Context [in]Pointer to a context supplied by I8042prt.
Value [in]Specifies the UCHAR value to write to an i8042 port.
WaitForACK [in]Specifies, if TRUE, that the routine waits until the write is acknowledged by the i8042 port. Otherwise, the routine returns without waiting for an acknowledgment from the port.
The PI8042_SYNCH_WRITE_PORT callback returns one of the following status values:
| Return code | Description |
|---|---|
| STATUS_SUCCESS | The routine successfully wrote a byte to an i8042 port. |
| STATUS_IO_TIMEOUT | The hardware was not ready for a write access. |
The PI8042_SYNCH_READ_PORT callback can only be used in a PI8042_KEYBOARD_INITIALIZATION_ROUTINE callback. I8042prt specifies the write port callback in the WritePort parameter that I8042prt inputs to a keyboard initialization routine.
The routine polls the hardware until a read is returned by the hardware or an internal time-out occurs.
PI8042_KEYBOARD_INITIALIZATION_ROUTINE