Design and Implementation of an Integrated Man-Machine Interface by Touch Panel for an Embedded Electronic Measurement System

摘要

In this paper we design and implement an integrated man-machine touch panel interface for an embedded electronic measurement system (EEMS). The interface module of our EEMS includes general electronic measurement instruments such as a waveform generator, an oscilloscope and a power supply. We integrate three man-machine interfaces into one window which works in cooperation with the touch panel. The display function and the input function are controlled by different registers in the touch panel. We also design a corresponding display interface and a corresponding input interface. For the waveform generator we provide a basic waveform output button and include sine, triangle, square and arbitrary waveforms. The arbitrary waveform allows the user to draw on the grid area of the panel by hand. The output voltage and the frequency are adjustable. The oscilloscope has a grid area to show the waveform and the frequency. The power supply has an adjustable estimate to adjust the output voltage. The external interface circuit includes a waveform generator, an oscilloscope and a power supply. The embedded system connects to the external interface circuit through the general purpose input/output port (GPIO). The power supply and the waveform generator provide an output function which outputs the digital data from the embedded system. The digital data are converted by the Digital Analog Converter (DAC) and then the analog signal is output. The oscilloscope has an input function. After the external analog signal has been converted by the Analog Digital Converter (ADC), the digital data are analyzed by the embedded system and displayed in the touch panel.