Apple-2-HW/arduino-vga
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Generating VGA video with an Arduino Uno / Atmega16u2 Microcontroller
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README.md

arduino-vga

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)
  • 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

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

To Restore Arduino Bootloader

  • 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