Recently, I am working for PLK that is a blackbox manufactor. In this project, Platform Developing is my job. Platform developting include Device driver(motion sensor, serial flash, GPS, PMIC, led, Buzzer, Key, timer) I did make intial codes for these, and released to customer now Customer's enginner modify that. Today, I found a bug for External GPIO Interrupt registering and added New API that USB Power Supply Detecting. USB Power Supply can detected by GPIO 13