EVT_SERCX2_CUSTOM_TRANSMIT_TRANSACTION_CLEANUP callback function (sercx.h)

Article
10/21/2021

The EvtSerCx2CustomTransmitTransactionCleanup event callback function is called by version 2 of the serial framework extension (SerCx2) to clean up the serial controller's hardware state after a custom-transmit transaction ends.

Syntax

EVT_SERCX2_CUSTOM_TRANSMIT_TRANSACTION_CLEANUP EvtSercx2CustomTransmitTransactionCleanup;

void EvtSercx2CustomTransmitTransactionCleanup(
  [in] SERCX2CUSTOMTRANSMITTRANSACTION CustomTransmitTransaction
)
{...}

Parameters

[in] CustomTransmitTransaction

A SERCX2CUSTOMTRANSMITTRANSACTION handle to a custom-transmit object. The serial controller driver previously called the SerCx2CustomTransmitTransactionCreate method to create this object.

Return value

None

Remarks

Your serial controller driver can, as an option, implement this function. If implemented, the driver registers the function in the SerCx2CustomTransmitTransactionCreate call that creates the custom-transmit object.

Your serial controller driver should implement an EvtSerCx2CustomTransmitTransactionCleanup function if it needs to clean up the serial controller state at the end of a custom-transmit transaction. SerCx2 calls this function, if it is implemented, after a custom-transmit transaction ends. In response to the EvtSerCx2CustomTransmitTransactionCleanup call, the serial controller driver must call the SerCx2CustomTransmitTransactionCleanupComplete method to notify SerCx2 after the clean-up work is done.

For more information, see SerCx2 Custom-Transmit Transactions.

Examples

To define an EvtSerCx2CustomTransmitTransactionCleanup callback function, you must first provide a function declaration that identifies the type of callback function you're defining. Windows provides a set of callback function types for drivers. Declaring a function using the callback function types helps Code Analysis for Drivers, Static Driver Verifier (SDV), and other verification tools find errors, and it's a requirement for writing drivers for the Windows operating system.

For example, to define an EvtSerCx2CustomTransmitTransactionCleanup callback function that is named MyCustomTransmitTransactionCleanup, use the EVT_SERCX2_CUSTOM_TRANSMIT_TRANSACTION_CLEANUP function type, as shown in this code example:

EVT_SERCX2_CUSTOM_TRANSMIT_TRANSACTION_CLEANUP  MyCustomTransmitTransactionCleanup;

Then, implement your callback function as follows:

_Use_decl_annotations_
VOID
  MyCustomTransmitTransactionCleanup(
    SERCX2CUSTOMTRANSMITTRANSACTION  CustomTransmitTransaction
    )
  {...}

The EVT_SERCX2_CUSTOM_TRANSMIT_TRANSACTION_CLEANUP function type is defined in the Sercx.h header file. To more accurately identify errors when you run the code analysis tools, be sure to add the Use_decl_annotations annotation to your function definition. The Use_decl_annotations annotation ensures that the annotations that are applied to the EVT_SERCX2_CUSTOM_TRANSMIT_TRANSACTION_CLEANUP function type in the header file are used. For more information about the requirements for function declarations, see Declaring Functions by Using Function Role Types for KMDF Drivers. For more information about Use_decl_annotations, see Annotating Function Behavior.

Requirements

Requirement	Value
Minimum supported client	Available starting with Windows 8.1.
Target Platform	Desktop
Header	sercx.h
IRQL	Called at IRQL <= DISPATCH_LEVEL.

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