diff --git a/README.md b/README.md index c3bfd3c..c533674 100644 --- a/README.md +++ b/README.md @@ -3,29 +3,27 @@ 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 \ No newline at end of file