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Direct Drive LCD Design Guide
4.1.10 LCDSetLineSource
Defines the source regions of the active display window.
Format
sI16 LCDSetLineSource
(sI16 Region, sI16 LineCount, uI16 *pSource, sI16 LineStep);
Parameters
Region
Region of display (horizontal strip). Ranging from 0 to MAX_FRAME_REGIONS (defined in
DirectLCD_CNF.h). Normally, region 0 starts at the bottom of the screen. However; when
V_LINES_INVERT is defined to change line presentation on the screen, region 0 will start at the top
of the screen. MAX_FRAME_REGIONS should be set to 1 if multiple regions are not used (this will
eliminate any associated runtime overhead).
LineCount
Is the number of lines associated with this region. This value can vary from 1 to V_LINES_PANEL.
pSource
Address of the first pixel of the first line within the region. The entire memory space of the region
must be within the “LCD_Frames” section, or the request will not be accepted.
LineStep
Distance (in pixels/uI16’s) from first pixel of first line to first pixel of second line (source regions can
be wider than the panel).
Return Values
0 on success, non-0 on failure
Properties
Prototyped in file ”DirectLCD.h”
Implemented in file “DirectLCD_SBF.c” for H8S family or “DirectLCD_XBCFT.c” for H8SX family.
Description
LCDSetLineSource defines the source regions of the active display window.
Note that LCDSetActiveRaster, LCDSetRasterOffset and LCDSetLineSource are similar in function and
interact.
Example
#pragma section LCD_Frames
// SRAM allocated for GUI display
uI16 GUI_buffer[50 * H_DOT_DISPLAY];
// allocate panning buffer 4x panel
uI16 Image_buffer[2* V_LINES_PANEL * 2 * H_DOT_DISPLAY];
#pragma section
……
(void)LCDSetLineSource (0,50,GUI_buffer, H_DOT_DISPLAY); //GUI Region
(void)LCDSetLineSource (1,V_LINES_PANEL-50,
&Image_buffer[ offset], 2*H_DOT_DISPLAY); //Pan Region
……
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