USB Interfaced VGA Clock Device

The project utilizes a PIC chip to create a clock that will display the time in an old monitor and will behave like a USB device.
A standard VGA signal is being generated by a software as it displays the date-time clock in a standard 6-digit. The color of the display can be blue or red, though green was chosen. By using old VGA monitors, a luminous and big wall clock can be created. The USB section consists of basic Microchip USB stack.

In the design, there is an interrupt in the beginning for every scan line. This will activate the HSync signal then schedules Timer0 to get another interrupt. After a small delay, the HSync signal is deactivated to prepare and calculate the address of video memory. The next interrupt will occur after 28uS while the video data is being outputted on RGB pins.

A routine transforms the numbers in display images in the main loop, every second, and plots them in video array. The display will show the time when seconds go from 0 to 7 and the date when seconds go from 8 to 9, as seen in old watches.