VGA/VIDEO转换器_ms1851资源-CSDN文库

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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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