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Direct Drive LCD Design Guide

4.1.8 LCDGetActiveFrame

Request which memory frame is currently displayed

Format

uI16 LCDGetActiveFrame(void);

Parameters

none

Return Values

Index of active frame raster.

Properties

Prototyped in file ”DirectLCD.h”

Implemented in file “DirectLCD_SBF.c” for H8S family or “DirectLCD_XBCFT.c” for H8SX family.

Description

Request which memory frame is currently displayed. Note that this function only returns valid information

when LCDSetActiveRaster is used to control the display content (as opposed to LCDSetLineSource).

Note that LCDSetActiveRaster, LCDSetRasterOffset and LCDSetLineSource are similar in function and

interact.

Example

uI16 frame_request;

……

frame_request = LCDGetActiveFrame(); /* switch buffers */

if (frame_request == 0)

LCDSetActiveRaster(1);

else

LCDSetActiveRaster(0);

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