This is open source alternative of STC8G1K17 MCU which controls OSD in this specific IPS LCD kit for gameboy pocket.
Pinout, SPI commands and stuff is based on reverse engineering of this specific IPS LCD kit!
If you decide to use this firmware i assume you are willing to take risk of bricking your IPS LCD kit!
Currently, there is no way to return to the original firmware!
Pay close attention to the PCB board photo i provided!
This firmware provides multiple compile-time options. These can be changed in defs.h.
- Python 3
- with
pillowlibrary
- with
- Make
- SDCC
- stcgal (flashing tool)
- install requirements
- enter project directory
- use
makecommand
stcgal.py -o program_eeprom_split=16384 flash.ihx
It is important to set program_eeprom_split!
Connect Tx -> Rx and Rx -> Tx. Use only 3V3 UART adapter!
Timing between SPI bytes is forced by the code. It is possible that current values won't work for you.
In such case just change values in each spi_wait call. Or add something like ttt += 4 into spi_wait.
Find out values that work for you but do not slow OSD too much.
Function spi_wait is in file spicmd.c.
There seems to be possible difference with different FPGAs.
If you find that your image is shifted to the side a bit, use SPI_OSDADDR_OFFSET compile option.
Touch both touch inputs at the same time.
Go to main menu and touch both touch inputs at the same time.
Technically, it should be possible to rewire three available inputs (A, B and select) to different keys.
Graphics, including every text, is in images directory. These PNG files automaticaly are converted when building using make.
Icons and texts can use 4 "shades". Palette is hardcoded due to OSD limitations.
If enabled, OSD is used to scroll a custom logo on power-on.
Beware, logo.png should only use two colors!
You can use original contrast pot to control brightness but it requires extra hardware modification.
If you don't have this modification disable ADC_BACKLIGHT compile option!
This modification is single wire and single capacitor, about 1uF.
