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BT818Q-R Scheda tecnica(PDF) 20 Page - Bridgetek Pte Ltd.

Il numero della parte BT818Q-R
Spiegazioni elettronici  Advanced Embedded Video Engine Datasheet
PDF  59 Pages
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Homepage  https://brtchip.com/
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BT817/8 Advanced Embedded Video Engine Datasheet
Version 1.1
Document No.: BRT_000302 Clearance No.: BRT#154
Block footprint sizes are not confined to powers-of-two, and are also not confined to be square. For 2D
formats the block dimensions range from 4 to 12 texels.
Using ASTC for the large ROM fonts can save considerable space. Encoding the four largest fonts in
ASTC 8x8 formats gives no noticeable loss in quality and reduces the ROM size from 1 Mbytes to
about 640 Kbytes.
4.3.3
ROM and RAM Fonts
The BT817/8 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. Fonts 31-34 are large ROM fonts encoded in ASTC 8x8 format. The user can define and load
customized font metrics into RAM_G or external flash, making it possible to support a full range of
Unicode characters with UTF-8 coding points.
Each ROM 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 Table 4-7.
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 Table 4-8, Table 4-9 and Table 4-10. 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
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
9
HT
8
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0



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