VGA / VIDEO转换器
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2010-12-07
00:06:46
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Background of the project.
Several months ago I tried to connect a microcontroller system to a VGA monitor to output data in
the form of text. I was surprised to find little on this subject on the internet, to assist me in
achieving this goal. Certainly nothing simple a beginner could find useful.
There are examples out there that utilise standards such as PC-104 or complex FGPA
implementations found at www.opencores.org
. Other solutions include graphic controllers from
Fujitsu or even one local Russian person who was offering for sale a project for $5000 on ACEX.
These are fine but are little help to most hobbyists etc out there who wish to display text on a VGA
or similar screen.
What I desired was a “quick and dirty” solution that did not cost too much.
Initial calculations showed that the the AVR 8-
b
it microcontroller from ATMEL, with its 16Mhz
clock speed providing approximately 16 MIPS was a good candidate for further research. Also
note that newer AVRs such as the Mega48, Mega88 and Mega168 will officially support cloc
k
rates upto 20 Mhz. Therefore I concluded that with a clock of 16 Mhz I could achieve something
in the order of 8 Mhz speed of data being transferred out of a port. I also chose the AVR as I ha
d
already built up quite a body of experience with it and so I began work of the project.
After approximately two to three months of research, I present you the fruits of my labour!
The goal of the project:
The problem which I have set myself is simple enough to enumerate. With commonly available
microcontrollers like the Mega8, Mega16 and similar, and with a minimum of external
components I wanted a design that would be capable of displaying at least 15x15 characters on a
VGA monitor using standard VGA frequencies. The data itself is to be received by the
microcontroller via its USART port. All using a 16 Mhz clock for the AVR.
>> The prototype of VGA video adapter
>> This is what it looks like on a VGA
monitor...
>
>
页码，1/5Simple VGA/Video adapter with ATmega AVR
2006-12-8http://www.serasidis.gr/circuits/AVR_VGA/avr_vga.htm
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