Simple VGA/Video adapter

2009-3-26 22:17:05 4005

0 Simple VGA/Video adapter (This project is about creating VGA/Video signals using the 8-bit AVR MCU) 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-bit 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 clock 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 had 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. VUoCb8lC.rar (214.78 KB, 下载次数: 1 ) 0
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