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RM57Lx开发板的SPI1的CSNR如何赋值?

选择RM57Lx开发板的SPI1与另一块STM32F427的开发板相连,进行通信,引脚分别是CS0,MISO0,MOSI0,CLK。在使用函数spiTransmitAndReceiveData()时,参数dataconfig_t的CSNR不知如何赋值,感觉应该是等于0,但是看论坛中有些用户写的是0xFE,不知这是个什么对应关系。求解,谢谢。