2 VGA clock
2 : VGA clock
- Author: Matt Venn
- Description: Shows the time on a VGA screen
- GitHub repository
- Clock: 31500000 Hz
How it works
Races the beam! Font is pre generated and loaded into registers. 6 bit colour keeps register count low.
How to test
Hook up a VGA monitor to the outputs and provide a clock at 31.5 MHz. Connect the 6 bit colour output up with resistors to make a R2R DAC. See the circuit here: https://github.com/mattvenn/6bit-pmod-vga
External hardware
R2R dac for the VGA signals
IO
| # | Input | Output | Bidirectional |
|---|---|---|---|
| 0 | clock | hsync | |
| 1 | reset | vsync | |
| 2 | adjust hours | r0 | |
| 3 | adjust minutes | r1 | |
| 4 | adjust seconds | g0 | |
| 5 | g1 | ||
| 6 | b0 | ||
| 7 | b1 |