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F28035 SPI-B的设置和SPI-A的设置一模一样,测试程序也一样,但是SPI-A的能出时钟信号,SPI-B却没有时钟信号输出。为啥? SPI-B不是和SPI-A等效的么?

F28035 SPI-B的设置和SPI-A的设置一模一样,测试程序也一样,但是SPI-A的能出时钟信号,SPI-B却没有时钟信号输出。为啥? SPI-B不是和SPI-A等效的么?请各路大侠多多指导。