Application Notes
AN_390
FT80x to FT81x Migration Guide
Version 1.0
Issue Date: 2015-09-30
This document highlights the enhanced features in the FT81x Series of
graphics controller ICs and the changes required to migrate from FT80x to
FT81x.
Use of FTDI devices in life support and/or safety applications is entirely at the user’s risk, and the
user agrees to defend, indemnify and hold FTDI harmless from any and all damages, claims, suits
or expense resulting from such use.
Future Technology Devices International Limited (FTDI)
Unit 1, 2 Seaward Place, Glasgow G41 1HH, United Kingdom
Tel.: +44 (0) 141 429 2777 Fax: + 44 (0) 141 429 2758
Web Site: http://ftdichip.com
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Table of Contents
1 Introduction .............................................................. 4
2 FT81x vs FT80x - Features Comparison ..................... 5
3 Application Migration from FT80x to FT81x ............... 6
3.1 Memory map addresses for RAM/ROM/Registers ................6
3.2 SPI packet structure ...........................................................8
3.3 Display settings parameters ................................................8
3.4 Default system clock ...........................................................8
3.5 Extension instructions for GPU primitives ...........................8
3.6 PALETTED8 Bitmap ..............................................................9
4 FTDI HAL based Migration - FT80x to FT81x ............ 11
5 Recommendations for better performance .............. 12
5.1 Auxiliary registers for command FIFO ............................... 12
5.2 Media FIFO for image decompression................................ 12
5.3 VERTEX_FORMAT for pixel / subpixel vertex instructions .13
5.4 VERTEX_TRANSLATE_X and VERTEX_TRANSLATE_Y .........14
5.5 CMD_SETFONT2 to facilitate easy calculation of address...15
5.6 CMD_SETBITMAP co-processor command ......................... 16
5.7 DXT1 Usage .......................................................................16
6 Contact Information ................................................ 17
Appendix A – References ............................................. 18
Document References ............................................................... 18
Acronyms and Abbreviations..................................................... 18
Appendix B – List of Tables & Figures .......................... 19
List of Tables............................................................................. 19
List of Figures ........................................................................... 19
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Appendix C – Revision History ..................................... 20
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1 Introduction
Building on the success of the first generation of FT80x Embedded Video Engine (EVE) devices with
integrated touch and audio functions, the series has now been extended to include a further four
devices which offer a plethora of improvements and extended capabilities, the FT81x series. The
FT810, FT811, FT812 and FT813 provide increased pixel resolution for sharper imagery, portrait
orientation capabilities, increased speed for faster data transfer and image/video loading, and
larger memory capacity.
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2 FT81x vs FT80x - Features Comparison
This section lists some of the enhanced features available in the FT81x compared to the FT80x
series.
Maximum screen resolution 800x600 pixels (increased from 512 x 512 on FT80x)
Colour signalling options of 18-bit (262K Colours) or 24-bit RGB (1.6 Million)
Object memory 1Mbyte (increased from 256kByte on FT80x)
MCU transfer with SPI or Dual SPI or QSPI interface option
Available in QFN-48 / QFN-56 package (RoHS compliant)
Extra-large ROM fonts added
Orientation switching support added with REG ROTATE and CMD SETROTATE (allows Portrait operation)
Master clock frequency improvement - REG PCLK can now be 1
Smooth playback - motion JPG encoded AVI video playback
Multiple 16/32 bit colour palettes supported with transparency
L2 format supported for efficient DXT1-style bitmaps
CMD MEDIAFIFO specifies an area of main memory to use as a FIFO for JPG, AVI and PNG loading
Multiple numeric formats supported including binary, octal, decimal and hex (FT80x was decimal only)
Simplified font loading with CMD SETFONT2
500-1000 times faster JPG loading
Pixel clock drawing increased from 4 to 16 pixels per clock
Quicker Firmware memory operations (e.g. copy, fill, CRC) due to tuned inner loops
CMD SNAPSHOT hundreds of times faster than FT80x
Auxiliary registers for cmd fifo for ease of command buffer management.
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3 Application Migration from FT80x to FT81x
3.1 Memory map addresses for RAM/ROM/Registers
The register map has changed between the FT80x and FT81x to accommodate the extra
object RAM and new registers. The Memory Map addresses for FT80x vs FT81x are given
in Table 1 - FT81x Memory map
and Table 2 - FT80x Memory Map
. For details of the full register map, refer to the programmers guide for the FT80x and FT81x
families.
Header files containing the register address definitions can also be found within the project zip files
for the sample projects. These can be included in other software projects to provide definitions for
the register map. Please refer to the EVE2 compatible samples on the project samples web page,
denoted by (+EVE2).
http://www.ftdichip.com/Support/SoftwareExamples/FT800_Projects.htm
Note that the EVE2 compatible headers have both FT80x and FT81x definitions, with a #define
used to select the required set.
Start
Address
End
Address
Size
NAME
00 0000h
0F FFFFh
1024 kB
0C0000h
0C0003h
4B
1E 0000h
2F FFFBh
1152 kB
2F FFFCh
2F FFFFh
30 0000h
Description
RAM_G
General purpose graphics RAM
ROM_CHIPID
FTDI chip identification and revision
information:
0C0000h: 08h
0C0001h: 10h (FT810), 11h(FT811),
12h(FT812), 13h(FT813)
0C0002h: 01h
0C0003h: 00h
ROM_FONT
Font table and bitmap
4B
ROM_FONT_ADDR
Font table pointer address
30 1FFFh
8 kB
RAM_DL
Display List RAM
30 2000h
30 2FFFh
4 kB
RAM_REG
Registers
30 8000 h
30 8FFFh
4 kB
RAM_CMD
Co-processor command circular buffer
Notes:
The addresses beyond this table are reserved and shall not be read or written unless otherwise specified.
Palette now uses an area within RAM_G instead of the dedicated area in FT80x.
ROM_CHIPID is within the RAM_G memory. These are the reset values. The values can be overwritten and so it is
recommended to read them before the application writes to these locations.
Table 1 - FT81x Memory map
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Start
Address
End
Address
Size
NAME
00 0000h
03 FFFFh
256 kB
0C 0000h
0C 0003h
4B
0B B23Ch
0F FFFBh
275 kB
0F FFFCh
0F FFFFh
10 0000h
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Description
RAM_G
Main graphics RAM
ROM_CHIPID
FT800/801 chip identification and revision
information:
0C0000h: 08h
0C0001h: 00h (FT800) 01h (FT801)
0C0002h: 01h
0C0003h: 00h
ROM_FONT
Font table and bitmap
4B
ROM_FONT_ADDR
Font table pointer address
10 1FFFh
8 kB
RAM_DL
Display List RAM
10 2000h
10 23FFh
1 kB
RAM_PAL
Palette RAM
10 2400h
10 257Fh
380 B
REG_*
Registers
10 8000 h
10 8FFFh
4 kB
RAM_CMD
Graphics Engine Command Buffer
1C 2000 h
1C 27FFh
2 kB
RAM_SCREENSHOT
Screenshot readout buffer
Note:
The addresses beyond this table are reserved and shall not be read or written unless otherwise specified.
Table 2 - FT80x Memory Map
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3.2 SPI packet structure
Since the FT81x supports SPI packet structures for dual and quad SPI modes, an extra dummy
byte needs to be added. Single channels for the FT81x are similar to the FT80x. For SPI memory
read transactions, the host sends two zero bits, followed by the 22-bit address. This is followed by
a dummy byte. After the dummy byte, the FT81x responds to each host byte with read data bytes.
3.3 Display settings parameters
Display scan-out parameters may need to be changed to meet the LCD panel requirements. Please
refer to the guide below that explains the factors to consider when selecting a display panel and
configuring the FT8xx registers accordingly.
Selecting an LCD Display
3.4 Default system clock
The default system clock for the FT80x is 48MHz, and for the FT81x it is 60MHz
By default the FT81x system clock is 60MHz when the input clock is 12MHz. The host is allowed to
switch the system clock to other frequencies (48MHz, 36MHz, and 24MHz) via the host command
“CLKSEL”. The clock switching command shall be sent in SLEEP mode only.
3.5 Extension instructions for GPU primitives
The maximum resolution for FT80x is 512 x 512 pixels, whereas for FT81x the maximum
resolution is enhanced to 800 x 600 pixels. Additional registers with a _H notation accommodate
the upper bits of the values (e.g. the higher bits of the stride / width / height).
Like the FT80x, the graphics engine in the FT81x takes the instructions from display list memory
RAM_DL in the form of commands. Each command is 4 bytes long and one display list can be filled
with up to 2048 commands as the size of RAM_DL is 8K bytes. The graphics engine performs the
respective operation according to the definition of commands.
The following set of commands allows setting of the Graphics State –
BITMAP_SIZE_H
Specify the 2 most significant bits of bitmaps dimension for the current handle.
Encoding
31
24
0x29
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4
reserved
3
2
width
1
0
height
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Parameters
Width:
2 most significant bits of bitmap width. The initial value is zero.
Height:
2 most significant bits of bitmap height. The initial value is zero.
Description
This command is the extension command of BITMAP_SIZE for bitmap larger than
511 x 511 pixels.
Graphics context
None
BITMAP_SIZE_H
Specify the 2 most significant bits of the source bitmap memory format and layout for the current
handle.
Encoding
31
24
23
4
0x28
reserved
3
2
linestride
1
0
height
Parameters
Linestride:
The 2 most significant bits of the 12-bit linestride parameter value
specified to BITMAP_LAYOUT.
Height:
The 2 most significant bits of the 11-bit height parameter value
specified to BITMAP_LAYOUT.
Description
This command is an extension of BITMAP_LAYOUT for large bitmaps. This command is not
needed if the specified linestride parameter value to BITMAP_LAYOUT is less than 1024
and the height parameter value is less than 512.
3.6 PALETTED8 Bitmap
The FT80x supports Paletted bitmaps. The new FT81x uses the Paletted8 format instead, which
requires some additional display list items in order to display the Paletted8 bitmap in colour. The
format can be set as follows:
BITMAP_LAYOUT
Encoding
31
24
0x07
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22
21
format
20
19
18
9
linestride
8
0
height
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The table below shows the format options for the FT81x including PALETTED8.
Name
Value
Bits/pixel
Alpha bits
Red bits
Green
bits
Blue bits
ARGB1555
0
16
1
5
5
5
L1
1
1
1
0
0
0
L4
2
4
4
0
0
0
L8
3
8
8
0
0
0
RGB332
4
8
0
3
3
2
ARGB2
5
8
2
2
2
2
ARGB4
6
16
4
4
4
4
RGB565
7
16
0
5
6
5
TEXT8X8
9
-
-
-
-
-
TEXTVGA
10
-
-
-
-
-
BARGRAPH
11
-
-
-
-
-
PALETTED565
14
8
0
5
6
5
PALETTED4444
15
8
4
4
4
4
PALETTED8
16
8
8
8
8
8
L2
17
2
2
0
0
0
Table 3 - BITMAP_LAYOUT Format List
An example of the PALETTED8 format is shown below
Figure 1 - PALLETED8 Format
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4 FTDI HAL based Migration - FT80x to FT81x
The migration recommendations mentioned in Section 3 are intended for users who are developing
their own source files.
The FTDI website has a range of examples which have been updated to support the FT81x in
addition to the original support for FT80x. Please refer to the samples with the (+EVE2) note.
http://www.ftdichip.com/Support/SoftwareExamples/FT800_Projects.htm
These examples use the #defines FT_80X_ENABLE and FT_81X_ENABLE in order to support both
families in the same source files. These defines are used throughout the main application code and
supporting c and header files.
To simplify the selection, these defines can be controlled from a single file called platform.h which
is present in each of the demo code projects. This file contains a high-level set of defines to select
the type of demo board, screen size and host platform. These in turn enable the associated defines
throughout the rest of the code.
Please refer to the sample projects from the link above and also the accompanying platform guide
for further details.
EVE Platform Guide
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5 Recommendations for better performance
The following sections show some of the ways in which the FT81x’s features can be used to
improve performance and/or reduce workload on the host MCU.
5.1 Auxiliary registers for command FIFO
To offload work from the MCU for checking the free space in the circular buffer, the FT81x offers
two auxiliary registers “REG_CMDB_SPACE” and “REG_CMDB_WRITE” for bulk transfers. It
enables the MCU to write commands and data to the co-processor in a bulk transfer, without
computing the free space in the circular buffer and increasing the address. As long as the amount
of data to be transferred is less than the value in the register “REG_CMDB_SPACE”, the MCU is
able to safely write all the data to “REG_CMDB_WRITE” in one write transfer.
5.2 Media FIFO for image decompression
The CMD_MEDIAFIFO command is used to set up a streaming media FIFO in RAM_G.
C prototype
void cmd_mediafifo ( uint32_t ptr,
uint32_t size );
Parameters
Ptr:
starting address of memory block
size:
number of bytes in the source memory block
Command layout
+0
CMD_MEDIAFIFO (0xffffff39)
+4
Ptr
+8
Size
Examples
To set up a 64-Kbyte FIFO at the top of RAM_G
and report the initial values of the read and write pointers:
for
JPEG
streaming,
cmd_mediafifo(0x100000 - 65536, 65536);//0x100000 is the top of RAM_G
printf("R=%08xW=%08x\n",rd32(REG_MEDIAFIFO_READ),rd32(REG_MEDIAFIFO_W
RITE));
prints:
000f000
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5.3 VERTEX_FORMAT for pixel / subpixel vertex instructions
The FT81x has support for configuring the vertex format. The purpose of using vertex_format is to
set the precision of VERTEX2F coordinates. Precisions of 1, 1/2, 1/4, 1/8 and 1/16 can be selected.
Encoding
31 30 29 28 27 26 25 24
23 22 21 20 19 18 17 16 15 13 12 11 10 9 8
76543
0x27
210
RESERVED
Frac
Parameters
Frac:
Number of fractional bits in X, Y coordinates. Valid range is from 0 to 4.
The initial value is 4.
Description
VERTEX2F uses 15 bit signed numbers for its (X, Y) coordinates. This command controls
the interpretation of these numbers by specifying the number of fractional bits.
By varying the format, an application can trade range against precision.
frac
Units in pixel precision
VERTEX2F range in pixels
0
1
-16384 to 16383
1
1/2
-8192 to 8191
2
1/4
-4096 to 4095
3
1/8
-2048 to 2047
4
1/16
-1024 to 1023
Table 4 - VERTEX_FORMAT and pixel precision
Graphics context
The value of frac is part of the graphics context
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5.4 VERTEX_TRANSLATE_X and VERTEX_TRANSLATE_Y
The VERTEX_TRANSLATE commands are added to ease the movement of a set of objects. These
commands allow translation of whole sets of primitives/widgets.
The VERTEX_TRANSLATE_X is used to specify the vertex transformations X translation. The
command is structured as follows:
Encoding
31 30 29 28 27 26 25 24
0x2B
23 22 21 20 19 18 17
16 15 14 13 12 11 10 9 8
7 6 5 4 3 2 10
RESERVED
x
Parameters
X:
signed x-coordinate in 1/16 pixel. The initial value is 0
Description
Specifies the offset added to vertex X coordinates. This command allows drawing
to be shifted on the screen.
Graphics context
The value of x is part of the graphics context.
The VERTEX_TRANSLATE_Y is used to specify the vertex transformation’s Y translation. The
command is structured as follows:
Encoding
31 30 29 28 27 26 25
24
0x2C
23 22 21 20 19 18 17
16 15 14 13 12 11 10 9 8 7
6 5 4 3 2 10
RESERVED
y
Parameters
y:
signed y-coordinate in 1/16 pixel. The initial value is 0
Description
Specifies the offset added to vertex Y coordinates. This command allows drawing
to be shifted on the screen.
Graphics context
The value of y is part of the graphics context
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5.5 CMD_SETFONT2 to facilitate easy calculation of address
In FT80x, the CMD_SETFONT was used to register one custom defined bitmap font into the coprocessor engine. In FT81x, CMD_SETFONT2, a new co-processor command, is added to setup a
custom font. To use a custom font with the co-processor objects, create the font definition in
RAM_G and issue CMD_SETFONT2, as described in section 5.5 of the FT81x Programmers Guide.
C prototype
void cmd_setfont2( uint32_t font,
uint32_t ptr,
uint32_t firstchar );
Command layout
+0
CMD_SETFONT2(0xffffff3b)
+4
Font
+8
Ptr
+12
firstchar
Parameters
Font:
The bitmap handle from 0 to 31
Ptr:
32 bit aligned memory address in RAM_G of font metrics block
Firstchar:
The ASCII value of the first character in the font.
Examples
With a suitable font metrics block loaded in RAM_G at address 100000, first character’s
ASCII value 32, to use it for font 20:
cmd_setfont2(20, 100000, 32);
cmd_button(15, 30, 130, 20, 18, 0, "This is font 18");
cmd_button(15, 60, 130, 20, 20, 0, "This is font 20");
Table 5 - CMD_SETFONT2 Example
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5.6 CMD_SETBITMAP co-processor command
This command facilitates easy construction of a bitmap using a set of GPU instructions.
It will generate the corresponding display list commands (BITMAP_SOURCE \ BITMAP_LAYOUT \
BITMAP_SIZE) for a given bitmap information, sparing the effort of writing the display list
manually.
The parameters filter / wrapx / wrapy in BITAMP_SIZE is always set to NEAREST / BORDER /
BORDER value in the generated display list commands.
C prototype
void cmd_setbitmap( uint32_t
addr,
uint16_t
fmt,
uint16_t
width,
uint16_t
height );
Parameters
Addr: Address of bitmap data in RAM_G.
Fmt:
Bitmap format, see the definition in BITMAP LAYOUT.
Width: bitmap width, in pixels.
Height:bitmap height, in pixels
Command layout
+0
CMD_SETBITMAP(0xffff ff43)
+4
Addr
+8
Fmt
+10
Width
+12
Height
Examples
NA
Note: Two bytes need to be appended after last parameter to provide 4 bytes alignment as
required by the co-processor
5.7 DXT1 Usage
The FT81x series provides support for the L2 bitmap format. If an FT80x application currently uses
DXT1, it could use the L2 bitmap format feature instead of the two L1 bitmaps supported in the
FT80x series.
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6 Contact Information
Head Office – Glasgow, UK
Branch Office – Tigard, Oregon, USA
Future Technology Devices International Limited
Unit 1, 2 Seaward Place, Centurion Business Park
Glasgow G41 1HH
United Kingdom
Tel: +44 (0) 141 429 2777
Fax: +44 (0) 141 429 2758
Future Technology Devices International Limited
(USA)
7130 SW Fir Loop
Tigard, OR 97223-8160
USA
Tel: +1 (503) 547 0988
Fax: +1 (503) 547 0987
E-mail (Sales)
E-mail (Support)
E-mail (General Enquiries)
[email protected]
[email protected]
[email protected]
E-Mail (Sales)
E-Mail (Support)
E-Mail (General Enquiries)
[email protected]
[email protected]
[email protected]
Branch Office – Taipei, Taiwan
Branch Office – Shanghai, China
Future Technology Devices International Limited
(Taiwan)
2F, No. 516, Sec. 1, NeiHu Road
Taipei 114
Taiwan , R.O.C.
Tel: +886 (0) 2 8791 3570
Fax: +886 (0) 2 8791 3576
Future Technology Devices International Limited
(China)
Room 1103, No. 666 West Huaihai Road,
Shanghai, 200052
China
Tel: +86 21 62351596
Fax: +86 21 62351595
E-mail (Sales)
E-mail (Support)
E-mail (General Enquiries)
E-mail (Sales)
E-mail (Support)
E-mail (General Enquiries)
[email protected]
[email protected]
[email protected]
[email protected]
[email protected]
[email protected]
Web Site
http://ftdichip.com
Distributor and Sales Representatives
Please visit the Sales Network page of the FTDI Web site for the contact details of our distributor(s) and sales
representative(s) in your country.
System and equipment manufacturers and designers are responsible to ensure that their systems, and any Future Technology
Devices International Ltd (FTDI) devices incorporated in their systems, meet all applicable safety, regulatory and system-level
performance requirements. All application-related information in this document (including application descriptions, suggested
FTDI devices and other materials) is provided for reference only. While FTDI has taken care to assure it is accurate, this
information is subject to customer confirmation, and FTDI disclaims all liability for system designs and for any applications
assistance provided by FTDI. Use of FTDI devices in life support and/or safety applications is entirely at the user’s risk, and the
user agrees to defend, indemnify and hold harmless FTDI from any and all damages, claims, suits or expense resulting from
such use. This document is subject to change without notice. No freedom to use patents or other intellectual property rights is
implied by the publication of this document. Neither the whole nor any part of the information contained in, or the product
described in this document, may be adapted or reproduced in any material or electronic form without the prior written consent
of the copyright holder. Future Technology Devices International Ltd, Unit 1, 2 Seaward Place, Centurion Business Park,
Glasgow G41 1HH, United Kingdom. Scotland Registered Company Number: SC136640
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Appendix A – References
Document References
FT81x Series Programmer’s Guide
FT800 Series Programmer’s Guide
FT81x EVE Datasheet
FT800 EVE Datasheet
Acronyms and Abbreviations
Terms
Description
API
Application Programming Interface
AVI
Audio Video Interleave
FIFO
First In First Out
GPU
Graphics Processor Unit
HSYNC
IO
Horizontal Synchronization
Input / Output
JPG
Joint Photographic Group
LCD
Liquid Crystal Display
MCU
Micro Controller Unit
MPU
Memory Protection Unit
PNG
Portable Network Graphics
QFN
Quad Flat No leads
QSPI
Quad Serial Peripheral Interface
RAM
Random Access Memory
RoHS
Restriction of Hazardous Substances Directive
ROM
Read only Memory
VSYNC
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Appendix B – List of Tables & Figures
List of Tables
Table 1 - FT81x Memory map ............................................................................................... 6
Table 2 - FT80x Memory Map ............................................................................................... 7
Table 3 - BITMAP_LAYOUT Format List................................................................................. 10
Table 6 - VERTEX_FORMAT and pixel precision ..................................................................... 13
Table 5 - CMD_SETFONT2 Example ..................................................................................... 15
List of Figures
Figure 1 - PALLETED8 Format ............................................................................................. 10
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Appendix C – Revision History
Document Title:
AN_390 FT80x to FT81x Migration Guide
Document Reference No.:
FT_001246
Clearance No.:
FTDI#471
Product Page:
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Document Feedback:
Send Feedback
Revision
Changes
Date
1.0
Initial Release
2015-09-30
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