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FT800 Embedded Video Engine Datasheet

Version 1.4

Document No.: BRT_000039 Clearance No.: BRT#001

that there are new commands in the FIFO, and the graphics engine updates REG_CMD_READ after

commands have been executed.

Main features supported are:



Drawing of widgets such as buttons, clock, keys, gauges, text displays, progress bars, sliders,

toggle switches, dials, gradients, etc.



JPEG decode (Only baseline is supported)



Inflate functionality (zlib inflate is supported)



Timed interrupt (generate an interrupt to host processor after a specified number of

milliseconds)



In built animated functionalities such as displaying logo, calibration, spinner, screen saver and

sketch



Snapshot feature to capture the current graphics display

For a complete list of graphics engine display commands and widgets refer to FT800 Series Programmers

Guide, Chapter 4.

4.3.2

ROM and RAM Fonts

The FT800 has built in ROM character bitmaps as font metrics. The graphics engine can use these metrics

when drawing text fonts. There are total 16 ROM fonts, numbered with font handle 16-31. 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 Table 4-6.

Address Offset

Size(byte)

Parameter Description

128

width of each font character, in pixels

128

font bitmap format, for example L1, L4 or L8

132

font line stride, in bytes

136

font width, in pixels

140

font height, in pixels

144

pointer to font image data in memory

Table 4-6 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 ROM font table for font index 16 is stored at ROM_FONT_ADDR, with other

font tables follow. The ROM font table and individual character width (in pixel) are listed in Table 4-7

through Table 4-9. 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 17

or 19 is fixed at 8 pixels for any of the Extended ASCII characters.

Font Index

16 17

18 19 20 21 22 23 24 25 26 27 28

29 30 31

Font format

Line stride

Font width

Font height

Image pointer

start address

(hex)

Table 4-7 ROM font table

Font Index =>

NULL

SOH

STX

ETX

EOT

ENQ

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