134 Flappy VGA
134 : Flappy VGA
- Author: Daniel Robinson
- Description: A simple flappy bird clone with a button input and 640x480 VGA output. 25MHz clock required.
- GitHub repository
- Clock: 25000000 Hz
- Feedback: ✅ 5
How it works
There are three main modules in the design. The vgaControl module takes in the clock and outputs the horizontal and vertical sync signals, and provides the current pixel coordinate to the bitGen module. The gameControl module takes the button input and updates the game state (bird position, pipe position, hole position, score, etc) each frame. The bitGen module takes in the game state and pixel coordinate and outputs the color that the current pixel should be.
How to test
The clock input should be set to 25MHz (or 25.179MHz, either should be close enough). ui_in[0] should be connected to a debounced button that goes low when pressed. The VGA output is compatible with the Tiny VGA PMOD (https://tinytapeout.com/specs/pinouts/). Once everything is connected, a reset may need to be triggered before normal operation. An image with a yellow square, green pillars, and blue background should appear. Pressing the button should cause the bird to flap and start moving towards the pipes. The goal is to go through the gap in the pipes. Your score will count up in binary on the bidirectional pins each time you successfully make it through a pipe.
External hardware
Some kind of VGA adapter needed. Compatible with Tiny VGA PMOD. Also needs a debounced button that goes low when pressed on ui_in[0].
IO
| # | Input | Output | Bidirectional |
|---|---|---|---|
| 0 | Button | R1 | score[0] |
| 1 | G1 | score[1] | |
| 2 | B1 | score[2] | |
| 3 | vsync | score[3] | |
| 4 | R0 | score[4] | |
| 5 | G0 | score[5] | |
| 6 | B0 | score[6] | |
| 7 | hsync | score[7] |
User feedback
- mattvenn: works perfectly
- Cutout1👑: I tested the design using the TinyTapeout Commander app with a 25 MHz clock, hooked up to a display through the TinyVGA PMOD. Connected an active low button to in_0. Everything worked as expected, the game was totally playable.
- chaseadam: very challenging to get past gates, but works!
- MichaelBell: Seems to work well, but it's extremely hard!
- mole99: Connected the Tiny VGA Pmod, works out of the box. Great game, but it is hard to play using the commander app!