FT800 datasheet(21/55 Pages) FTDI

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Document No.: FT_000792

FT800

Embedded Video Engine

Datasheet Version 1.1

Clearance No.: FTDI# 334



The primitive objects supported by the graphics processor are: lines, points, rectangles,

bitmaps (comprehensive set of formats), text display, plotting bar graph, edge strips,

and line strips, etc.



Operations such as stencil test, alpha blending and masking are useful for creating a

rich set of effects such as shadows, transitions, reveals, fades and wipes.



Anti-aliasing of the primitive objects (except bitmaps) gives a smoothing effect to the

viewer.



Bitmap transformations enable operations such as translate, scale and rotate.



Display pixels are plotted with 1/16th pixel precision.



Four levels of graphics states



Tag buffer detection

The graphics engine also supports customized build-in widgets and functionalities such as jpeg

decode, screen saver, calibration etc. The graphics engine interprets commands from the MPU

host via a 4 Kbyte FIFO in FT800 memory at RAM_CMD. The MPU/MCU writes commands into

the FIFO, and the graphics engine reads and executes the commands. The MPU/MCU updates

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

Programmer Guide [FTDI Document FT_000793], 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.

Table 4-6 Font table format

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

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.

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