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采用rs232实现了上位机PC与存储卡之间的通讯，尽心数据的读取和存储，非常典型的实例。-Rs232 achieved using PC communication between the PC and the memory card, the data is read and stored in dedicated, very typical example.

STM32-SPI读取外部存储,详细程序注释(STM32-SPI read external storage, detailed program notes)