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spi
- 此函数把SPI的读写功能集成在一块,传递的val既是向SPI写的数据,也是从SPI读取的数据,只需要在执行读或写之前把MCU的I/O脚设置成相应的输出或输入即可。-This function of the SPI read and write functions integrated in one, passing val both written to the SPI data is read from the SPI data, only need to perform a read or