Implementation of a software layer, in C language, to manage embedded graphics developed with TouchGFX, with a "general purpose" approach extended to other embedded graphic libraries and to Model Based Design (Simulink/Stateflow). Interface aims to manage transmission of events between hardware target and GUI, but also to make possible a communication between GUI simulator and Model-Based-Design tool. Interface manages events occurred between hardware and GUI, through two different queues. When an event occurs on target, it is pushed into queue and then, extracted on User Interface, where a callback is executed to modify correspondent object. Actual states of widgets on GUI or peripherals on target are saved within a table.