Abstract: The development, application and research of single chip microcomputer will bring up a group of engineers and scientists with intelligent computer control. Some middle schools have also set up curriculum design of single chip microcomputer and related courses. Experimental teaching is an important link in the teaching process of MCU and Interface Technology. In view of the teaching reform of the single-chip microcomputer course, the experimental link of the single-chip microcomputer course is continuously strengthened, the teaching method is reformed, and the virtual simulation experiment is applied to the single-chip microcomputer teaching. Practice shows that this method is beneficial to stimulate students' interest in learning, cultivate students' engineering literacy and innovation ability, and improve teaching effect.
Paper Keywords: MCU; Teaching; Simulation experiment?
Principle of Single Chip Microcomputer is a highly theoretical, logical and practical subject, and it is a very important professional basic course for electrical majors. It integrates computer interface, assembly language, communication technology and other knowledge points, and belongs to a professional basic course with strong logicality, engineering, technology and practicality. As one of the most important core courses of electrical specialty, this course is the carrier of all automatic control knowledge structure needed by high-quality skilled talents of electrical specialty, and occupies a very important position.
However, the traditional single-chip microcomputer teaching generally pays attention to the system structure of the course itself and the logical connection before and after, and takes the subject system as the starting point, ignoring the "learnability". It is difficult for students to learn and teachers to teach, but the teaching effect is not obvious.
I. Research background and significance
At present, single-chip microcomputer is listed as a separate competition in China, and the examination emphasizes the cultivation of students' ability, and the education of students' skill literacy has become the top priority. In addition, society needs highly skilled talents. In order to meet the needs of social development and market, many schools have set up single-chip microcomputer courses in different majors. However, the single-chip microcomputer course is a very practical course. In order to achieve good results in the teaching process, students must be required to practice more in the learning process. However, some schools have limited teaching facilities. How to solve this problem? The simulation experiment class can make students learn while working in the studio of single chip microcomputer, and really play with single chip microcomputer, and at the same time solve the embarrassing situation that students are boring to learn and teachers are struggling to teach.
At present, there are many problems in MCU teaching. For example, the theory of single-chip microcomputer course is the main course, and the experimental teaching is mostly to carry out verification experiments. Due to the limitation of space and time, it is difficult for students to access the necessary equipment, such as simulators and experimental boards, except in class. The cost of personal equipment is too high for individuals to bear. Moreover, the experimental box can only verify the basic function and significance of the experiment, not to mention the cultivation and improvement of students' practical ability. The application speed of single-chip microcomputer in today's society is developing rapidly, but the teaching materials of single-chip microcomputer are outdated and the experimental equipment is easy to lag behind, which will inevitably bring about problems such as cost. Therefore, it is of great significance to construct a low-cost MCU simulation experiment system for MCU teaching. It can not only reduce the investment in experimental equipment, but also improve students' engineering quality and cultivate their innovative spirit. In the design and development of single-chip microcomputer control system, we should not only emphasize the automation and intelligence of the equipment, but also pay attention to the stability of the control system, otherwise the superiority of the control system will not be reflected.
Because the working environment of the application system of single chip microcomputer control system is often harsh and complicated, the reliability and safety of its application have become a very prominent problem. The application of single-chip microcomputer control system must run stably and reliably for a long time, otherwise the control error will increase, which will make the system ineffective and even cause huge losses.
The main factors that affect the reliable and safe operation of single chip microcomputer control system are all kinds of electrical interference from inside and outside the system, as well as system result design, component selection, installation, manufacturing technology and external environmental conditions. The interference consequences of these factors on the control system are mainly manifested in the following aspects. (1) Data acquisition error increases. (2) The control state is out of order. (3) Data changes due to interference. (4) The program is out of order.
Because the value of the counter is random after being disturbed, the program is chaotic. Usually, the program will execute a series of meaningless instructions and finally enter an "infinite loop", which will cause serious output confusion or system failure.
With the rapid development of single-chip microcomputer and its interface technology, there are outstanding problems in vocational education at present: the quality ability is not compatible with the scale ability, the degree of teaching informatization is low, the old cramming classroom teaching mode is still widely adopted, the construction mechanism of "double-qualified" teachers is not perfect, the scientific management level and reform and innovation ability are put on the agenda, the management system is not perfect, the basic school-running norms are not perfect, the scientific evaluation standards and mechanisms of vocational education are not up to standard, and the "channel" for students' growth is blocked.
Judging from the new teaching requirements, it is not enough for such courses to only teach basic principles in class. Practice should be strengthened in teaching, and a certain number of high-quality supporting experimental courses and independent experimental courses should be offered, so that students can have enough experimental opportunities. Furthermore, it puts forward high requirements for the construction of the experimental teaching environment of single chip microcomputer. How to solve this problem, MCU simulation experiment came into being.
Second, a preliminary study of "single chip microcomputer simulation experiment"
With the rapid development of computer technology, various simulation systems appear in various fields, which provide accurate and reliable guarantee for the development of various practical systems and save a lot of manpower and material resources for many schools and enterprises. There are also many simulation tools in the field of electronic information technology, such as various EDA tools used in class; Commonly used electronic application simulation software, such as Protel and Multisim for analog-digital mixed simulation, Fundation, Maxplus II and Expert for digital system design, etc.
The so-called "simulation" is to truly simulate the running environment of the user system by developing tools, so that users can observe the state and results of the system under transparent and controllable conditions. Simulation is actually a comprehensive debugging method of software and hardware, which can improve the efficiency of application system development.
To describe the "single chip microcomputer simulation experiment" in popular words is to put some virtual components on the virtual circuit board according to the design idea of the real circuit, simulate the actual process of burning ROM, link the program code, "open" the circuit and observe the effect. If it is not ideal, the circuit or program code can be modified repeatedly until it meets the design requirements.
The benefits of simulation experiments are obvious. In the era without simulation experiments, it takes time, energy and money to build a real circuit, which may be wasted if you are not careful. In addition, the ROM chip in the single chip microcomputer is erased many times, and a program may need to be modified and erased many times, which invisibly reduces the service life of the ROM chip. The simulation experiment is carried out on a computer (it may cost a little electricity), and there is no such problem. Moreover, as far as the current simulation software is concerned, the simulated circuit effect is exactly the same as the real circuit. It is no exaggeration to say that as long as the simulation is successful, it can be produced directly on the assembly line of the factory.
Third, the single-chip computer simulation experiment effect
The core idea of the new curriculum is: "Pay attention to the progress and development of every student, so that every student can actively participate in communication, exploration and reporting in class, and can move, so that every student can enter the nearest development zone, gain something and succeed." In order to effectively implement this core idea, after a period of teaching practice, it is gradually found that the single chip microcomputer simulation experiment is a more effective teaching method. It not only solves the contradiction that students only study but don't practice, but also relieves the pressure of equipment construction in some schools.