VGA signal generator

VGA Signal Generator - Early Version
        (More features will be added gradually)
 
Update Log
2023/11/21 Updated V0_2:

Modified to use a timer to generate the vertical sync signal, avoiding errors in the vertical sync signal that cause some monitors to not recognize the correct resolution.
Added button support: M key to switch between automatic/manual mode; up and down keys to change the displayed solid color image.
IRC frequency modified to 25.175MHz. 

 
Note: Overall design scheme block diagram: Schematic design description:
 
 
The main controller uses a cheap
and easy-to-use STC8H8k64U (
later upgraded to STC32G12K128).
The pins of the two are fully compatible.
If you only want to implement a simple VGA signal generator, you can use the former.
The latter is for later advanced applications.
 
USB interface for convenient use with chargers, etc. Actual
 test: R4, R5, and R6 do not need to be soldered. Monitors with a voltage greater than 0.7V will display the highest RGB color.
 
 
PCB design description:
 
Because I have an STC-USB LINK1D tool, I did not reserve a power switch.
If you do not have a similar tool, you need to add a switch, otherwise it will be difficult to burn
 
the software. Description:



PWM 1P generation Horizontal synchronization signal. The RGB signal 2N 3N 4N used for testing changes color every 1000ms during task scheduling (implemented by switching 2N 3N 4N).




Physical demonstration: Outputting a solid color close-up high-definition image
 
via VGA. The LED has a cold solder joint; it only lights up when pressed. (´・ω・)  Notes: Demonstration video (breadboard version)