This project is based on another project named DIY-OSD. https://github.com/schugabe/DIY-OSD.
Know more about DIY OSD on RCGroups. https://www.rcgroups.com/forums/showthread.php?1473207-Diy-osd-(Arduino-and-opensource)
MCU: Silicon Lab EFM8BB21f16G_A_QFN20
IDE: uVision Keil (C51 Lab)