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README.md
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Generating VGA video with an Arduino Uno / Atmega16u2 Microcontroller.
**To Connect (atmega16u2):**
Connect all grounds on the VGA connector together.
Connect VGA ground to the Arduino Gnd.
Place a 120ohm resistor from the MOSI2 pin (Pin 4 on ICSP) to PB7 (Pin 4 on JP2)
*Optional Protection* Place a 1N4148 diode from PB7 (anode) to Gnd (cathode).
Connect the VGA red, blue and green inputs together and connect to PB7.
Connect VGA vsync to PB5 (Pin 3 on JP2).
Connect VGA hsync to PB4 (Pin 1 on JP2).
* Connect all grounds on the VGA connector together.
* Connect VGA ground to the Arduino Gnd.
* Place a 120ohm resistor from the MOSI2 pin (Pin 4 on ICSP) to PB7 (Pin 4 on JP2)
* Connect the VGA red, blue and green inputs together and connect to PB7.
* Connect VGA vsync to PB5 (Pin 3 on JP2).
* Connect VGA hsync to PB4 (Pin 1 on JP2).
**To Assemble:**
avr-as -mmcu=atmega16u2 -o ghettovga.o ghettovga.s
avr-ld -m avr35 -o ghettovga.bin ghettovga.o
avr-objcopy -j .text -j .data -O ihex ghettovga.bin vghettovga.hex
* avr-as -mmcu=atmega16u2 -o ghettovga.o ghettovga.s
* avr-ld -m avr35 -o ghettovga.bin ghettovga.o
* avr-objcopy -j .text -j .data -O ihex ghettovga.bin vghettovga.hex
**To Upload:**
Temporarily short pins 5 and 6 on the atmega16u2 ICSP header.
dfu-programmer atmega16u2 erase
dfu-programmer atmega16u2 flash "./ghettovga.hex"
dfu-programmer atmega16u2 reset
* Temporarily short pins 5 and 6 on the atmega16u2 ICSP header.
* dfu-programmer atmega16u2 erase
* dfu-programmer atmega16u2 flash "./ghettovga.hex"
* dfu-programmer atmega16u2 reset
**To Restore Arduino Bootloader**
Temporarily short pins 5 and 6 on the atmega16u2 ICSP header.
Retrieve the appropriate usb-serial hex from:
https://github.com/arduino/Arduino/tree/master/hardware/arduino/avr/firmwares/atmegaxxu2/arduino-usbserial
Use dfu-programmer to flash hex to atmega16u2
* Temporarily short pins 5 and 6 on the atmega16u2 ICSP header.
* Retrieve the appropriate usb-serial hex from: http://bit.ly/1E3pMbU
* Use dfu-programmer to flash hex to atmega16u2
Font glyphs copyright (c) 1981 Michael C. Koss http://mckoss.com/jscript/tinyalice.htm