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SPI数据发送问题



我设置SPI 为3-pins master模式,数据为16位,给SPIDAT0赋值从1开始的递增数,用示波器在SIMO管脚检测不到信号,而赋值0x5555或0xaaaa时能检测到波形,但是不是我所给SPIDAT0的值,SCLK没问题,希望能给予帮助,谢谢