Research And Implementation Of Control System In Hematology Analyzer Based On WinCE

Hematology analyzer is a kind of medical instruments that can quickly analyze the parametersof blood. Therefore, it is able to provide reliable basis for the medical diagnosis. Usually, ahematology analyzer consists of control system, blood cells recognition system, hemoglobindetermination system, fluid control system, power system and mechanical executive system.Among them, control system is the core component of hematology analyzer. It is not onlyresponsible for the coordination of other functional units, but also need to complete data processingand human-computer interaction. Thus, the performance of instrument is greatly determined by thecontrol system. With the application of embedded operating system, the performance ofhematology analyzers has been improved in some fields like fast response and high reliability, etc.However, the control system of thin embedded operating system such as uC/OS-II still has someshortcomings, such as poor peripheral expansion, unfriendly human-computer interaction, etc.Hence, it is unable to meet the growing requirements of application.Due to the advantages of rich resources, friendly graphic interface and customization in Win-CE embedded operating system, this paper designs a control system of hematology analyzers basedon WinCE. The hardware of control system consists of a core board and a control board. With anembedded microprocessor S3C2440A as the core, the core board not only extends the SDRAM,NOR Flash and NAND Flash memory, but also integrates a power module and a clock circuit. Andthe control board is composed of power, reset, alarm module, buttons, LCD, touch screen, network,JTAG, USB, UART and SPI communication interface. Therrfore, the system can establish connec-tion with other units of a hematology analyzer by SPI to transfer data and instructtions.Upon the completion of hardware design and debugging, this paper successfully transplanttedWinCE operating system based on the characteristics of board support package. In this work, itmainly completed the external interrupt, LCD, touch screen, enhanced SPI and USB laser printerdevice driver to realize the customization of WinCE. Under WinCE development environment,this paper completed the framework of application software, which includes initialization module,counting module, calibration module, quality control module, browse module, setting module andmaintenance module. Based on this, this paper mainly realizes the initialization module, countingmodule and calibration module by MFC development technology. Together with other functionmodules, this paper constitutes the whole application system. The control system not only meetsthe requirements of diverse application, but also ensures the real-time and reliability. Finally, according to the structure of control system, from bottom to top, this paper hascompleted the test of hardware circuit, device drivers and application software. The results showthat hardware and software of control system are well designed with a number of advantages.Therefore, this control system can fully meet the demands of hematology analyzers.