Nuvoton has license emWin library from Segger. It is really simple to use API of emWin to develop human machine interface(HMI) on the product. This example code uses M480 MCU and utilizes API of emWin to draw graphic that can be used as a button to change value of text edit on the panel. emWin can easily implement how to use graphic as a widget, button to adjust the value of text edit on the NuMaker-PFM-M487 V3.0 board.