VGA demo on a STM32F103 board
There are 4 demos:
- Displaying color image (taken from http://www.worldofspectrum.org/pub/sinclair/screens/load/b/scr/BubbleBobble.scr)
- Text typing and moving cursor (font is taken from http://caxapa.ru/149446.html)
- Drawing (taken from https://github.com/Avamander/arduino-tvout/blob/master/examples/DemoNTSC/DemoNTSC.pde)
- Game (taken from http://http.debian.net/debian/pool/main/x/xonix/xonix_1.4.orig.tar.gz)
Video
My idea of “fun” maybe odd, but here it is. This is a demo that displays a color VGA video with resolution of 256x192 and 64 colors without any specialized video hardware on a tiny STM32F103 microcontroller that has only 20 KB of RAM with CPU running at 72 MHz.
| PIN | Description | Connect To | Output |
|---|---|---|---|
| PB08 | Red 1 | Resistor 680 Ohm | VGA red (1) |
| PB09 | Red 2 | Resistor 470 Ohm | VGA red (1) |
| PB12 | Green 1 | Resistor 680 Ohm | VGA green (2) |
| PB13 | Green 2 | Resistor 470 Ohm | VGA green (2) |
| PB14 | Blue 1 | Resistor 680 Ohm | VGA blue (3) |
| PB15 | Blue 2 | Resistor 470 Ohm | VGA blue (3) |
| PB0 | HSync | VGA HSync (13) | |
| PB6 | VSync | VGA VSync (14) | |
| PA0 | CLK | Resistor 2K2 to keyboard CLK and resistor 3K3 to GND | |
| PA1 | DATA | Resistor 2K2 to keyboard DATA and resistor 3K3 to GND | |
| G | Ground | VGA Ground (5,6,7,8,10) |
| Hardware | Qty |
|---|---|
| STM32F103 board | 1 |
| VGA connector | 1 |
| PS/2 Keyboard | 1 |
| Power supply 5V DC for keyboard | 1 |
| Resistors 470 Ohm | 3 |
| Resistors 680 Ohm | 3 |
| Resistors 2.2 KOhm | 2 |
| Resistors 3.3 KOhm | 2 |
| Breadboard | 1 |
| Jumper wires | 18 |
| ST-Link v2 or clone | 1 |