Epson S1D13705 - Manual (Page 150)

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S1D13705 Programming Notes and Examples
X27A-G-002-03 Issue Date: 02/01/22
int seSplitInit(WORD Scrn1Addr, WORD Scrn2Addr)
Description: This function prepares the system for split screen operation. In order for split screen
to function the starting address in the display buffer for the upper portion(screen 1)
and the lower portion (screen 2) must be specified. Screen 1 is always displayed
above screen 2 on the display regardless of the location of their start addresses.
Parameters: Scrn1Addr - offset, in bytes, to the start of screen 1
Scrn2Addr - offset, in bytes, to the start of screen 2
Return Value: ERR_OK - operation completed with no problems
Note
It is assumed that the system has been initialized prior to calling seSplitInit().
int seSplitScreen(int Screen, int VisibleScanlines)
Description: Changes the relevant registers to adjust the split screen according to the number of
visible lines requested. 'WhichScreen' determines which screen, 1 or 2, to base the
changes on.
The smallest surface screen 1 can display is one line. This is due to the way the
S1D13705 operates. Setting Screen 1 Vertical Size to zero results in one line of
screen 1 being displayed. The remainder of the display will be screen 2 image.
Parameters: Screen - must be set to 1 or 2 (or use the constants SCREEN1 or SCREEN2)
VisibleScanlines- number of lines to display for the selected screen
Return Value: ERR_OK - operation completed with no problems
ERR_HAL_BAD_ARG- argument VisibleScanlines is negative or is greater than
vertical panel size or WhichScreen is not SCREEN1 or SCREEN 2.
Note
Changing the number of lines for one screen will also change the number of lines for the
other screen.
seSplitInit() must be called before calling seSplitScreen().