Limitations; Examples - Epson S1D13505F00A Technical Manual

8.4 Limitations

The following limitations apply to SwivelView
• Only 8 bpp and 16 bpp modes are supported - 1/2/4 bpp modes are not supported.
• Cursor and ink images are not rotated - software rotation must be used. SwivelView
turned off when the programmer is accessing the Cursor or the ink layer.
• Split screen images appear side-by-side, i.e. the portrait display is split vertically.
• Pixel panning works vertically.
Note: Drawing into the hardware cursor/ink layer with rotation enabled does not work without some form of
address manipulation. The easiest way to ensure correct cursor/ink images is to disable Swivel-
TM
View , draw in the cursor/ink memory, then re-enable SwivelView
memory each pixel must be transformed to its rotated position.

8.5 Examples

Example 7
Enable portrait mode for a 640x480 display at 8 bpp.
Before switching to portrait mode, display memory should be cleared to make the transition
smoother. Currently displayed images can not be simply rotated by hardware.
1. The first step toward enabling portrait mode is to set the line offset to 1024 pixels. The Line Off-
set register is the offset in words.
Write 0x200 to registers [17h]:[16h]. That is write 0x02 to register [17h] and 0x00 to register
[16h].
2. The second step to enabling portrait mode is to set the Display 1 Start Address. The Display Start
Address registers form a pointer to a word, therefore the value to set the start.
Write 0xC0 (192 or (1024 - 480)/2) to registers [10h], [11h] and [12h]. That is write 0xC) to reg-
ister [10h], 0x00 to register [11h] and 0x00 to register [12h].
3. Enable display rotation by setting bit 7 of register [0Dh].
4. The display is now configured for portrait mode use. Offset zero into display memory will
correspond to the upper left corner of the display. The only difference seen by the programmer
will be in acknowledging that the display offset is now 1024 pixels regardless of the physical
dimensions of the display surface.
S1D13505 PROGRAMMING NOTES
AND EXAMPLES (X23A-G-003-05)
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8: HARDWARE ROTATION
TM :
TM
. While writing the cursor/ink
EPSON
TM
must be
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