# CARD_WriteAndVerifyEepromAsync

## Syntax

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

## Arguments

dst | Transfer destination EEPROM address.
src | Transfer source memory address.
len | Byte length of data being written.
callback | Completion callback function. Specify `NULL` if this is unnecessary. This callback is called from within the interrupt handler.
arg | Arguments to pass to the completion callback function. This is simply ignored if `NULL` was specified for `callback`.

## Return Values

None.

## Description

Asynchronously writes data to an EEPROM device and compares the written data. This function immediately returns control. To use this function, you must first lock the access bus with the `CARD_LockBackup` function. Use the `CARD_WaitBackupAsync` function to wait for processing to end. To determine the processing result, call the `CARD_GetResultCode` function after processing is complete.
This function communicates with the ARM7 processor internally via PXI.
The process will not end if PXI interrupts are not enabled.

## Internal Operation

This function executes an asynchronous process using an internal thread. See the description of the `CARD_GetThreadPriority` function for more information on this thread.

## See Also

`CARD_IsBackupEeprom
CARD_WaitBackupAsync
CARD_GetResultCode
CARD_ReadEeprom
CARD_WriteEeprom
CARD_VerifyEeprom
CARD_WriteAndVerifyEeprom
CARD_GetThreadPriority`

## Revision History

2005/06/01 Added a statement indicating that callback is called from interrupt handler.
2004/12/09 Changed "IO processor" to "ARM7 processor".
2004/11/02 Revised links.
2004/08/18 Added description of PXI interrupts.
2004/07/28 Initial version.

CONFIDENTIAL