Aiming at the problem that the equipment training in ultra-short wave radio training has limited equipment, large equipment loss, and large gap between the operation experience and installation of the existing pure software simulation training system, an ultra-short wave radio simulation training system based on STM32 and MAX7349 is proposed. The system uses STM32 as the microprocessor to realize the control of buttons, LEDs, display screens and audio interfaces, provides the same human-computer interaction interface with the installed radio stations, realizes data interaction with the computer through the serial port, and completes the simulation of radio communication by means of computer network. And the monitoring of training can provide the trainee with an operating experience that does not have a gap with the real equipment. It is easy to grasp the basic situation of each individual in the training process, and it is convenient for large-scale centralized training, while reducing costs and avoiding electromagnetic radiation and interference.
Military ultrashort wave radio is the main equipment for close communication of boats, and it is the equipment that boat communication personnel must be skilled in. Due to the high cost of ultra-short wave radios equipped with military standard production, it is difficult to achieve radio stations according to the number of trainees. In the case of a limited number of cases, frequent operations during the training of trainees are likely to cause equipment damage, and electromagnetic equipment used in multiple equipments. Radiation and interference problems cannot be ignored. In order to solve the limitations of the installation in teaching practice, the ultra-short-wave radio simulation training system based on simulation technology is widely used in teaching and training.
This paper is aimed at a certain type of marine ultrashort wave radio, based on STM32 and MAX7349 to realize the physical simulation of the radio and human interface. Considering the faster installation and replacement, the circuit design reserves a variety of buttons and LED configuration. The need for an ultrashort wave radio simulation training system. Communication simulation is based on computer network, which realizes simulation of ultra-short wave communication environment, communication service simulation, complex electromagnetic environment simulation, and can also carry out training scenario design, training process monitoring and training effect evaluation.
1 system overall design
The simulation training system is mainly composed of hardware simulator, student computer, monitoring computer and network facilities, as shown in Figure 1.
The hardware simulator adopts the same appearance and human-computer interaction interface as the ultra-short wave radio, and uses STM32F407 as the core device, including USB to serial port module, audio input and output module, display module and keyboard knob LED module, among which USB to serial port module realizes and students The interaction between the operational state of the computer and the communication content.
The student computer connects to the hardware simulator through the USB cable and accesses the network through the network cable to realize the communication simulation between the simulators and the cooperation with the monitoring calculation.
The monitoring computer accesses the network through the network cable to monitor all student computers and hardware simulators.
2 hardware simulator circuit design
2.1STM32F407 Introduction
Based on the ARM Cortex-M core, the STM32 series of microprocessors are designed for embedded applications with high performance, low cost and low power consumption. They are widely used in industrial control, data acquisition, network communication and other fields. The system hardware simulator microprocessor selects STM32F407, based on 32-bit ARM Cortex-M4 core, the main frequency can reach 168 MHz, has 192 KB SRAM, 1 024 KB Flash, 2 full-duplex SPI, 3 I2C, 6 Serial port, one FSMC interface and supports up to 112 general purpose I/O ports.
2.2USB to serial port module circuit design
The interface between the microprocessor and the student computer adopts the serial communication mode. Considering that the current mainstream computer rarely supports the serial port, the USB to serial port method is adopted, and the CH340G chip of Nanjing Yuheng is selected, and the circuit is as shown in FIG. 2 . The originating and receiving ends of the serial data of USRAT1 of the microprocessor are respectively connected with the receiving end and the transmitting end of the serial data of CH340G, and the USB data D+ and D- of CH340G can be connected with the computer through the USB port to realize the microprocessor and the student. Serial communication between computers via USB connection. In the figure, Q1 and Q2 form the serial port download circuit of the hardware simulator, and one-click download of the software code can be realized through the serial port.
2.3 audio input and output module
The audio input and output module uses Wolfson's WM8978 as the audio processing chip, and TI's LM4990 is selected as the speaker driver chip. WM8978 has better digital signal processing capability, integrated microphone support, audio data transmission through I2S and microprocessor, and chip configuration through I2C interface. The LM4990 is a 2 W output audio power amplifier chip that requires fewer external components, eliminates the need for external output coupling capacitors and bootstrap capacitors, and has a built-in standby circuit that turns off the amplifier to operate at a lower power state.
2.4 display module
The display screen uses 128&TImes; 128 dot matrix liquid crystal display module, and the module control chip is T6963C, which is connected with the FSMC bus of the microprocessor. Since the FSMC bus voltage standard is +3.3 V, and the display module's voltage standard is +5.0 V, a voltage conversion chip is required between the FSMC bus and the display module bus. The SN74LVC4245 chip of TI Corporation is used to realize the bus voltage conversion, and the SN74LVC4245 supports 8-way bidirectional. Voltage conversion.
2.5 keyboard, knob and LED
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