基于MSP430单片机的信号发生器设计-学位论文.doc

With the development of science and technology and the need for modern scientific research, signal generators have become indispensable tools for research and testing in many industries. Signal generators, also known as signal sources or oscillators, have a wide range of applications in production and scientific fields. Various waveform curves can be represented by trigonometric equations. Circuits that can generate various waveforms, such as triangular waves, sawtooth waves, square waves (including square waves), and sine waves, are called function signal generators. Function signal generators have a wide range of uses in circuit experiments and equipment testing. For example, in communication, broadcasting, and television systems, RF (radio frequency) transmission is required. The RF wave is the carrier that carries audio (low frequency), video signals, or pulse signals. An oscillator that can generate high-frequency oscillations is required. In the fields of industry, agriculture, biomedical sciences, etc., oscillators with different power levels and frequencies are needed for applications such as high-frequency induction heating, smelting, quenching, ultrasound diagnostics, and magnetic resonance imaging. This system uses the MSP430F149 microcontroller as the control core, and utilizes the built-in DA chip of the microcontroller. The desired waveform (sine wave, square wave, triangular wave, or sawtooth wave) can be selected logically through key interrupts, and other keys can be used to control the amplitude and frequency of the waveform. The waveform is then displayed on the LCD1602 through microcontroller control. The generation of the waveform is achieved by the microcontroller executing a certain waveform generation program, generating data at the input end of the D/A converter in a certain order, and obtaining the corresponding voltage waveform at the output end of the circuit. The keyboard buttons on the MSP430 learning board are used to select various waveforms, amplitude voltages, and frequencies through software programming, and different signal waveforms are generated by pressing different buttons. The advantage of this solution is that the circuit principle is relatively simple and easy to implement. Keywords: MSP430, signal generator, LCD1602.