Abstract : This paper introduces an example of developing a human-machine interface using the DSP2812 as an embedded controller. It describes the processing methods of the SED1335 LCD controller and PS/2 keyboard in practical applications, and analyzes the refresh rate of the RT320240B LCD screen and the error rate of the PS/2 keyboard. Addressing the problem of slow refresh rate when driving large-size LCD screens with DSP, practical hardware and software improvement methods are proposed. This human-machine interface is widely applicable to various embedded systems, is easy to operate, and has great practical value. Keywords : DSP2812; human-machine interface; SED1335; PS/2 keyboard 1. Introduction The human-machine interface is an important component of various embedded control systems. It facilitates information exchange between humans and machines, real-time system control, and the return of system status. In embedded systems, LCD screens and keyboards are mostly used as input and output devices for the human-machine interface. The DSP2812, with its high speed and rich external interfaces, is widely used in various control fields. DSP programming using C language offers advantages such as strong program execution capability and short development time. Its rich peripheral interfaces also facilitate the selection of design schemes based on engineering requirements. The human-machine interface developed in this paper, as a component of the data acquisition system, provides a convenient means for system control and operation monitoring, and it also has wide applicability in various embedded control systems. [Download the full text of "DSP Embedded System Human-Machine Interface Design"]