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大佬们，你们好，由于这个芯片的SPI1只有一个硬件片选信号，我们想通过软件片选的方式驱动多个spi设备，但因为网上资料较少，无从下手，假设增加PB12和PD10为两个SPI设备的软件片选引脚，请问需要增改哪些文件
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