CAMERA_I2CExposure*

Syntax

#include <twl/camera.h>

CAMERAResult CAMERA_I2CExposure(CAMERASelect camera, int exposure);
CAMERAResult CAMERA_I2CExposureAsync(CAMERASelect camera, int exposure, CAMERACallback callback, void *arg);

Arguments

camera Camera to configure (CAMERA_SELECT_IN, CAMERA_SELECT_OUT, or CAMERA_SELECT_BOTH).
exposure Amount of exposure to set.
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

Sets the camera exposure (illumination time). The exposure argument must be specified between -5 and 5.

Unlike CAMERA_I2CExposure, the CAMERA_I2CExposureAsync function returns control immediately and runs asynchronously. Use callback to confirm that processing has completed.

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. If camera settings are changed during image capture, therefore, an application's timing may make it impossible to get an image with the changes applied.

Although this function enables automatic exposure, it is reenabled if a CAMERA_I2CAutoExposure* function is called.

Occasional Shifting of Captured Images
The captured image may shift if this function is called during image capture.
Before calling this function, first stop the image capture with CAMERA_StopCapture. Then call this function. After this function completes execution, restart the image capture with CAMERA_StartCapture.

See Also

CAMERASelect
CAMERACallback
CAMERAResult CAMERA_I2CAutoExposure*

Revision History

2009/11/11 Explained occasional shifting of captured images.
2009/10/14 Added a description of operations when automatic exposure has been disabled.
2009/03/25 Added information about changing camera settings during capture operations.
2008/10/30 Added that CAMERA_SELECT_BOTH can also be specified.
2007/10/12 Initial version.


CONFIDENTIAL