Simple implementation of the game "Snake" with VGA Output.
Due to size limitations snake can only grow to 9 body parts.
Game resets when snake touches border or any of its body parts
Vga output is compatible with tiny vga pmod.
After reset snake can be controlled though inputs. When collecting an apple snake grows by 1 body part.
clock has to be set to 25.179 Mhz for vga sync signal generation to work.
inputs should be done with push buttons. Not pressed is logic 0, pressed is logic 1
So an external circuit with pull down resistors should be used for input.
If no tiny VGA pmod is available a vga dac like in this project:https://tinytapeout.com/runs/tt04/178/
could probably also be used.
VGA Display, external buttons for input
| # | Input | Output | Bidirectional |
|---|---|---|---|
| 0 | none | R1 | none |
| 1 | none | G1 | none |
| 2 | none | B1 | none |
| 3 | none | vsync | none |
| 4 | Right | R0 | none |
| 5 | Left | G0 | none |
| 6 | Down | B0 | none |
| 7 | Up | hsync | none |