# CARD_VerifyFlashAsync

## C Specification

  `#include <nitro/card.h>`
  `static inline void CARD_VerifyFlashAsync( u32 dst, const void *src, u32 len, MIDmaCallback callback, void *arg);`

## Arguments

dst | The FLASH address of the comparison target
src | Memory address of comparison source.
len | Byte length of data to be compared.
callback | Callback function for when the process completes. If the callback is not necessary, specify NULL. This callback is called from inside the interrupt handler.
arg | Argument passed to the callback function when the process completes. If NULL has been specified for the callback, this value is simply ignored.

## Return Values

None.

## Description

This function asynchronously compares the data of the FLASH device with the designated memory. This function immediately returns control. In order to use this function, you must first lock the access bus with the `CARD_LockBackup` function. To wait for the process to end, use the `CARD_WaitBackupAsync` function. To determine the result of the process, call the `CARD_GetResultCode` function after the process has ended.
This function communicates with the ARM7 processor internally via PXI.
The process will not end if PXI interrupts are not enabled.

## Internal Operation

`The function executes an asynchronous process using an internal thread. To learn more about this internal thread, see the explanation for the `CARD_GetThreadPriority` function.`

## See Also

`CARD_IsBackupFlash CARD_WaitBackupAsync, CARD_GetResultCode, CARD_ReadFlash, CARD_WriteFlash, CARD_VerifyFlash, CARD_WriteAndVerifyFlash, CARD_GetThreadPriority`

## Revision History

06/01/2005 Added a statement indicating that callback is called from interrupt handler.
12/09/2004 Changed "IO processor" to "ARM7 processor".
11/02/2004 Revised links.
08/23/2004 Revised links due to function changes.
08/18/2004 Initial version.

CONFIDENTIAL