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两片2808的DSP芯片的SPI通信问题

做两台2808DSP芯片SPI通信的时候发现一个问题,已知主机DSP的MOSI引脚因为虚焊导致通信异常,检测主机DSP的MOSI上无电平变化,一直是低电平;主机SPI的片选引脚STE和时钟信号引脚CLK检测波形都正常,为什么在从机DSP的MOSI上检测到了占空比接近50%的PWM波?按理说主机DSP没有正常发出波形,为什么会在从机的MOSI引脚上会有PWM波呢,两者之间不是应该通过线路连接,电平变化应该一致啊?ps:此时从机只有接收到时钟和片选信号,从机MISO有波形,但是是错误的波形,导致主从机之间的SPI通讯失败