As people's living standards continue to improve, people's attention to their own health has also risen to an unprecedented height. Today, more and more high-tech means are beginning to be applied to the design of medical instruments. Electrocardiogram, EEG and other physiological parameter testing equipment, various types of monitoring instruments, ultrasound, X-ray imaging equipment, nuclear magnetic resonance instruments, and a variety of physical therapy devices are widely used in hospitals around the country, and medical instruments are Towards a combination of modularity, versatility, intelligence and miniaturization. Modern medical instruments generally use embedded microprocessors to enhance the intelligence of the instrument, improve its stability and accuracy of data processing, integrate medical signal acquisition, processing, and communication, and have self-diagnosis and self-diagnosis. A series of advantages such as verification. ARM (Advanced RISC Machines) embedded micro-board as a central processing module, with its small size, powerful, low power consumption and high stability, the advantages of hardware and instruction dual acceleration to improve performance and command speed are widely used. , has become the first choice of many medical equipment manufacturers.
1 Structure and characteristics of ADUC7026From the perspective of ARM architecture, embedded systems are mainly composed of embedded processors, supporting hardware and embedded software. The processor is usually a single chip microcomputer or a microcontroller; the supporting hardware mainly includes a storage medium, a communication component, and a display component; the embedded software includes a driver supporting the hardware, an operating system, supporting software, and an application middleware. It can be seen that the embedded system is a big concept. Once the embedded processor and supporting hardware are selected, the most work is concentrated in the embedded software. Many of the most computationally intensive instruments use ARM systems. Analog Devices, Inc., a US-based analog device company, is a chip manufacturing company that specializes in the design and production of op amps and high-precision analog-to-digital converters (ADCs). High-precision ADC, mature pulse modulation, multi-way frequency division and other integration, so that ARM microcontroller not only has a powerful 32bit RISC microcontroller (MCU) core, but also has 16 channels, fast, 12bit resolution Precision data converter for ADC and four 12-bit resolution digital-to-analog converters (DACs). The ADμC7026 therefore integrates the ARM7TDMI core with a flash-based 16bit/32bit RISC (Reduced Instruction Set Computer) microcontroller with a maximum processing power of up to 45MIPS (Million InstrucTIons Per Second). Analog peripherals include up to 16 channels of fast, 12-bit resolution ADC, 4 independent 12-bit resolution DACs, and a precision bandgap reference with a drift of better than 10ppm/°C, 8kB of on-chip SRAM, 62kBFLASH, expandable The storage space is 512k, the JTAG port supports code download and debug, a comparator, programmable logic array (PLA) and 3-phase pulse width modulation (PWM) generator, 40 general purpose I/O ports, 1 ART, 4 General purpose timer, 4 external interrupts, other peripherals include a comparator, PLA and 3-phase PWM generator. The devices also support flexible standby (sleep) and wake-up modes. The pins are available in a small LFCSP or LQFP package to avoid or reduce external interference and improve measurement accuracy. Its internal block diagram is shown in Figure 1.
At present, the general medical colleges have opened the course "Medical Imaging Equipment" for medical imaging technology. Since some of the control parts of the actual medical instruments are integrated inside the machine, it is inconvenient for students to complete the control operation experiment of a single circuit, and there are objective conditions such as expensive, lacking, and difficult to meet the actual needs of the students. To this end, combined with the actual situation of medical imaging technology, the AUDC7026 produced by American Analog Devices is used as the core to develop an ARM hardware system that can be used for students to complete general circuit hardware experiments and hardware development for teachers and students. An experimental system suitable for students to complete the control part of medical equipment to help students master the basic composition, working principle, interface circuit and hardware connection of medical instruments from practice, and expand the basic capabilities of software and hardware development on this basis. To lay a good foundation for cultivating students' innovative ability and practical application in the future. The schematic diagram of the structure of the developed hardware system is shown in Figure 2.
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