RtecatRegisterCallbackOnTransmit

RtecatRegisterCallbackOnTransmit registers a function to be called every cycle when the output data is about to be sent. The function runs on the selected processor core.

Syntax

Copy

RTECAT_ERROR RtecatRegisterCallbackOnTransmit(
  [in]    RTECAT_HANDLE MainDevice,
  [in]    APP_CALLBACK UserCallback,
  [in]    VOID* pContext,
  [in]    ULONG IdealProcessor,
  [in]    ULONG Priority
);

Parameters

[in] MainDevice

A handle to a MainDevice. To retrieve the corresponding handle, use RtecatOpenMainDevice.

[in] UserCallback

A pointer to a callback function of type APP_CALLBACK to be called every cycle. APP_CALLBACK is defined in RtecatApi.h:

typedef int(*APP_CALLBACK)(PVOID Context);

Parameter:

Context: A pointer to the user data.

[in] pContext

A pointer that passes data to a callback function.

[in] IdealProcessor

The index of the RTSS core to run a callback function thread.

[in] Priority

The priority of a callback function thread. The valid range is 0-124.

Return Values

The function returns an RTECAT_ERROR value. If the function succeeds, it returns ecatErrNoError. If the function fails, it returns a different value.

Possible return values:

Return value	Meaning
ecatErrNoError	The function succeeded.
ecatErrNullParameter	Parameter UserCallback is NULL.
ecatErrWrongParameter	One of the following conditions occurred: Parameter MainDevice or IdealProcessor is invalid. The value of parameter Priority is greater than 124.
ecatErrMainDeviceNotReady	The MainDevice instance does not exist.
ecatErrWrongEnvironment	The MainDevice is switching to the Offline state.

Remarks

RtecatRegisterCallbackOnTransmit is only available for real-time interfaces.

RtecatRegisterCallbackOnTransmit is a synchronous function that executes immediately and returns a result upon completion.

wRTOS Runtime stops calling the callback function if it returns a non-zero return code.

Requirements

Minimum supported version	Header	Library
wRTOS 1.0 SDK	RtecatApi.h	RtecatApi.lib (RTSS)