326 One Sprite Pony
326 : One Sprite Pony
- Author: Leo Moser
- Description: This SVGA design has exactly one trick up its sleeve: it displays a sprite!
- GitHub repository
- Clock: 0 Hz
- Feedback: ✅ 2
How it works
A one-trick pony is someone or something that is good at doing only one thing. Accordingly, a one-sprite pony can display only one sprite, and that's exactly what this design does:
This Verilog design produces SVGA 800x600 60Hz output with a background and one sprite. Internally, the resolution is reduced to 100x75, thus one pixel of the sprite is actually 8x8 pixels. The design can operate at either a 40 MHz pixel clock or a 10 MHz pixel clock by setting a configuration bit.
The sprite is 12x12 pixel in size and is initialized at startup with a pixelated version of the Tiny Tapeout logo.
An SPI receiver accepts various commands, e.g. to replace the sprite data, change the colors or set the background.
How to test
Connect a Tiny VGA to the output Pmod connector. By default, you should see the TinyTapeout logo moving around the screen. By sending commands over SPI via the bidirectional Pmod you can change the sprite and the background, set the sprite position and much more. See the longer documentation for all commands.
External hardware
Tiny VGA PMOD
IO
| # | Input | Output | Bidirectional |
|---|---|---|---|
| 0 | R1 | CS | |
| 1 | G1 | MOSI | |
| 2 | B1 | MISO | |
| 3 | VS | SCK | |
| 4 | R0 | Vertical Pulse | |
| 5 | G0 | Horizontal Pulse | |
| 6 | B0 | ||
| 7 | HS |
User feedback
- mattvenn: Shows the TT logo bouncing around slowly scrollling diagonal bars. Leo also showed on the stream the SPI interface working
- MichaelBell: Works great, and it is fun to play with the different modes over the SPI interface! Some issues with glitching when moving the sprite - probably resolvable with more careful timing of the position commands.