1.2 KiB
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) 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).
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: https://github.com/arduino/Arduino/tree/master/hardware/arduino/avr/firmwares/atmegaxxu2/arduino-usbserial Use dfu-programmer to flash hex to atmega16u2
Font glyphs copyright (c) 1981 Michael C. Koss http://mckoss.com/jscript/tinyalice.htm