A Cardiopulmonary Resuscitation System Based On C8051F020 Micro-controller Unit

SOC(System on Chip) is the final state of embedded application system. In the lowest field of embedded application system, eight bit single chip microcomputer C8051F020 which has SOC kernel has very powerful process ability. In this paper, a cardiopulmonary resuscitation(CPR) device which uses C8051F020 as the control core is designed, the system can be used to save someone's life out of the hospital.The high-pressure oxygen is the power source of the system. The oxygen in the single direction pump pushes the compactor to press the chest of a patient, cardiopulmonary resuscitation is bringing into effect. A 12 volt accumulator is used as power supply; the switch of an electromagnetic valve controls the frequency of pressing; the pressure of oxygen which has been decompressed by a valve controls the degree of pressing; the touch screen and liquid crystal display are the interface between human and machine. According to the purpose that the device should achieve, choosing the right parts, the design for the system's mechanical structure was given.According to the C8051F020's feature and internal source, the system circuit diagram is designed, and the corresponding printed circuit board is manufactured. Using C8051F020 as the control core, in term of the circuit function which the control system should realize, the control system circuit is divided into six modules, including touch screen, liquid crystal display, step motor, flash memory, data clock and voltage conversion modules. Referring to the chips'data sheet, distributing in reason C8051F020's pin source, connecting C8051F020 and chips, the system circuit diagram and printed circuit board were finished.Following are the drivers for the chips, which are programmed in C51 language according to the C8051F020 interface and bus format. They are composed of ADS7843 touch control chip, SED1330 liquid crystal display control chip, ULN2803 step motor control chip, AT45DB081 flash memory, PCF8563 data clock chip and MAX202 chip. During the programming and debugging, the main paragraph is shown, the emphasis on the problem which maybe appear and the part which is critical and hard to understand are also presented. The system is very portable because high-pressure oxygen is the power source; Fracture preventing measure assures the system's security; To adopt C8051F020 which can be programmed in system, it makes the system software be very convenient to update and maintenance. To popularize this system, it will improve greatly the CPR effect. How to display the pressure and the physiology parameter of patient should be settled ulteriorly.