sed1355 ETC-unknow, sed1355 Datasheet - Page 210

• Manufacturer Part Number: sed1355
• Description: Sed1355 Embedded Ramdac Lcd/crt Controller
• Manufacturer: ETC-unknow

Page 54
SED1355
X23A-G-003-05
Note
Note
int seSplitScreen(int DevID, int WhichScreen, long VisibleScanlines)
Description:
Parameters:
Return Value: ERR_OK
int seVirtInit(int DevID, DWORD VirtX, DWORD * VirtY)
Description:
Parameter:
Return Value: ERR_OK
seSplitInit() must be called before calling seSplitScreen()
Changing the number of lines for one screen will also change the number of lines in the other
screen (e.g. increasing screen 1 lines by 5 will reduce screen 2 lines by 5).
The system must have been properly initialized prior to calling seVirtInit()
Changes the relevant registers to adjust the split screen according to the number of
visible lines requested. WhichScreen determines which screen, screen 1 or screen 2,
to change.
The smallest screen 1 can be set to is one line. This is due to the way the register
values are used internally on the SED1355. Setting the line compare register to zero
results in one line of screen 1 being displayed followed by screen 2.
DevID
WhichScreen- must be set to 1 or 2, or use the constants SCREEN1 or SCREEN2,
VisibleScanlines- number of lines to show for the selected screen
ERR_HAL_BAD_ARG- argument VisibleScanlines is negative or is greater than
This function prepares the system for virtual screen operation. The programmer
passes the desired virtual width, in pixels, as VirtX. When the routine returns, VirtY
will contain the maximum number of lines that can be displayed at the requested
virtual width.
DevID
VirtX
VirtY
ERR_HAL_BAD_ARG - returned in three situations
- registered device ID
to identify which screen to base calculations on
- operation completed with no problems
vertical panel size or WhichScreen is not SCREEN1 or SCREEN 2.
- registered device ID
- horizontal size of virtual display in pixels.
(Must be greater or equal to physical size of display)
- a return placeholder for the maximum number of lines available
given VirtX
- operation completed with no problems
1) the virtual width (VirtX) is greater than the largest attainable width
The maximum allowable xVirt is 7FFh * (16 / bpp))
2) the virtual width is less than the physical width, or
3) the maximum number of lines is less than the physical number of
lines
Epson Research and Development
Programming Notes and Examples
Vancouver Design Center
Issue Date: 99/04/27