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FT813Q-R Scheda tecnica(PDF) 23 Page - Bridgetek Pte Ltd.

Il numero della parte FT813Q-R
Spiegazioni elettronici  Advanced Embedded Video Engine
PDF  63 Pages
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Copyright © Bridgetek Pte Ltd
23
FT81X Embedded Video Engine Datasheet
Version 1.4
Document No.: BRT_000002 Clearance No.: BRT#004
For
a
complete
list
of
graphics
engine
display
commands
and
widgets
refer
to
FT81x_Series_Programmer_Guide, Chapter 4.
4.3.2
ROM and RAM Fonts
The FT81x has built in ROM character bitmaps as font metrics. The graphics engine can use these metrics
when drawing text fonts. There are a total of 19 ROM fonts, numbered with font handle 16-34. The user
can define and load customized font metrics into RAM_G, which can be used by display command with
handle 0-15.
Each font metric block has a 148 byte font table which defines the parameters of the font and the pointer
of font image. The font table format is shown in Error! Reference source not found..
Address Offset
Size(byte)
Parameter Description
0
128
width of each font character, in pixels
128
4
font bitmap format, for example L1, L4 or L8
132
4
font line stride, in bytes
136
4
font width, in pixels
140
4
font height, in pixels
144
4
pointer to font image data in memory
Table 4-7 Font table format
The ROM fonts are stored in the memory space ROM_FONT. The ROM font table is also stored in the
ROM. The starting address of the ROM font table for font index 16 is stored at ROM_FONT_ADDR, with
other font tables following. The ROM font table and individual character width (in pixel) are listed in
Error! Reference source not found. through Error! Reference source not found.. Font index 16, 18
and 20-31 are for basic ASCII characters (code 0-127), while font index 17 and 19 are for Extended
ASCII characters (code 128-255). The character width for font index 16 through 19 is fixed at 8 pixels for
any of the ASCII characters.
Font Index
1
6
1
7
1
8
1
9
2
0
2
1
2
2
2
3
2
4
2
5
2
6
2
7
2
8
2
9
3
0
3
1
3
2
3
3
3
4
Font format
L
1
L
1
L
1
L
1
L
1
L
1
L
1
L
1
L
1
L
1
L
4
L
4
L
4
L
4
L
4
L
4
L
4
L
4
L
4
Line stride
1
1
1
1
2
2
2
3
3
4
7
8
9
1
1
1
4
1
8
2
3
3
0
3
9
Font width
(max)
8
8
8
8
1
1
1
3
1
7
1
8
2
5
3
4
1
3
1
5
1
9
2
1
2
8
3
7
4
9
6
3
8
2
Font height
8
8
1
6
1
6
1
3
1
7
2
0
2
2
2
9
3
8
1
6
2
0
2
5
2
8
3
6
4
9
6
3
8
3
1
0
8
Image
pointer start
address
(hex)
Table 4-8 ROM font table
Font Index
=>
16/
18
2
0
2
1
2
2
2
3
2
4
2
5
2
6
2
7
2
8
2
9
3
0
3
1
3
2
3
3
3
4
0
NULL
8
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
SOH
8
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
2
STX
8
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
3
ETX
8
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
4
EOT
8
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
5
ENQ
8
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
6
ACK
8
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
7
BEL
8
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
8
BS
8
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0



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