PDETERMINE_IEEE_MODES callback function (parallel.h)

Article
02/22/2024

The PDETERMINE_IEEE_MODES-typed callback routine determines which IEEE 1284 protocols a parallel device supports. The system-supplied bus driver for parallel ports supplies this routine.

Syntax

PDETERMINE_IEEE_MODES PdetermineIeeeModes;

USHORT PdetermineIeeeModes(
  [in] PVOID Context
)
{...}

Parameters

[in] Context

Pointer to a device extension of a parallel device's physical device object (PDO).

Return value

The return value indicates which protocols a parallel device supports. The return value is a bitwise OR of one or more of the following constants that represent the protocols that are supported by the system-supplied bus driver for parallel ports. The protocol constants are listed in order of decreasing data transfer rate.

BOUNDED_ECP

ECP_HW_NOIRQ

EPP_HW

EPP_SW

ECP_SW

IEEE_COMPATIBILITY

CENTRONICS

NONE

Remarks

To obtain a pointer to the system-supplied PDETERMINE_IEEE_MODES callback, a kernel-mode driver uses an IOCTL_INTERNAL_PARCLASS_CONNECT request, which returns a PARCLASS_INFORMATION structure. The DetermineIeeeModes member of the PARCLASS_INFORMATION structure is a pointer to this callback.

The PDETERMINE_IEEE_MODES callback runs in the caller's thread at the IRQL of the caller.

Requirements

Requirement	Value
Target Platform	Desktop
Header	parallel.h (include Parallel.h)

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