# CAMERA_I2CFrameRate*

## Syntax

  `#include <twl/camera.h>`
  `CAMERAResult CAMERA_I2CFrameRate(CAMERASelect camera, CAMERAFrameRate rate);`
  `CAMERAResult CAMERA_I2CFrameRateAsync(CAMERASelect camera, CAMERAFrameRate rate, CAMERACallback callback, void *arg);`

## Arguments

camera | Camera to configure (`CAMERA_SELECT_IN`, `CAMERA_SELECT_OUT`, or `CAMERA_SELECT_BOTH`).
rate | Frame rate.
callback | Function that is called when asynchronous processing has completed.
arg | Arguments when the callback function is invoked.

## Return Values

Returns `CAMERA_RESULT_SUCCESS` if configuration was successful.

## Description

Changes the camera's frame rate.
Unlike `CAMERA_I2CFrameRate`, the `CAMERA_I2CFrameRateAsync` function returns control immediately and runs asynchronously. Use callback to confirm that processing has completed.
Do not set `CAMERA_FRAME_RATE_30_TO_10`, `CAMERA_FRAME_RATE_30_TO_5`, or `CAMERA_FRAME_RATE_30` with this function while either `CAMERA_SIZE_VGA` or `CAMERA_SIZE_DS_LCDx4` is specified with the `CAMERA_I2CSize*` functions. Capture data becomes impossible to receive if these settings are used at the same time.
Note: If camera settings are changed using any of the `CAMERA_I2C*` functions, the changes may be delayed for approximately one frame before they are applied. Consequently, note that if camera settings are changed while capturing, the application may not be able to get an updated image (an image with changes applied) at the time the application intended.

## See Also

`CAMERASelect`
`CAMERACallback`
`CAMERAResult`
`CAMERAFrameRate`
`CAMERA_I2CSize*`

## Revision History

2009/07/03 Updated information related to usage conditions.
2009/03/25 Added a note on changes to camera settings during capture operations.
2008/10/30 Noted that `CAMERA_SELECT_BOTH` can also be specified.
2008/03/17 Explained that images cannot be captured at 30 fps for the DS_LCDx4 size.
2008/01/23 Explained that images cannot be captured at 30 fps for the VGA size.
2007/11/12 Initial version.

CONFIDENTIAL