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使用ccs10.0
SDK为：simplelink_cc13x2_26x2_sdk_4_30_00_54
使用TI LaunchPAD cc2652r1f MCU
在配置SPI时，选择mode时，选择 3pin 和 4pin的区别是什么？如下图：
3pin 选择后，程序需要怎么配置
4pin action low 和4pin action High 程序需要怎么配置？
选择active low ,應該是调用SPI_transfer函数CS脚就会自动变成低调平
