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##

# 2.91.7 QEIx_CallbackRegister Function

## C

    /* x = QEI instance number */

    void QEIx_CallbackRegister ( QEI_CALLBACK callback, uintptr_t context )

## Summary

Registers the function to be called from interrupt.

## Description

This function registers the callback function to be called from interrupt

## Precondition

QEIx_Initialize must have been called first.

## Parameters

Param | Description
--- | ---
callback | Callback function pointer
context | Value provided back to the caller by the callback (usually a pointer to the caller's context for multi-instance clients)

## Returns

None.

## Example

    void QEI_CallbackFn(QEI__STATUS status, uintptr_t context);

    QEI_Initialize();
    QEI_CallbackRegister(QEI_CallbackFn, NULL);

## Remarks

Context value can be set to NULL if not required. To disable callback function, pass NULL for the callback parameter.