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中文摘要：
介绍了一款基于ARM9的心电图机热敏打印系统的设计与实现。硬件方面分析了系统的框图及热敏打印头和步进电机的核心电路，软件方面介绍了SPI接口驱动程序的编写及基于位图的波形映射算法。结果表明，该系统比传统的心电图机打印系统灵活性更高，波形质量更好。
英文摘要：
A thermal print system for an electrocardiograph based on ARM9 MCU is introduced. The system structure frame, the circuit of thermal print head and motor control, the SPI driver and a bitmap print method are presented. Practical application demonstrates that this system works with better sensitivity and wave quality than the tradition one.
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