我用DSPC6748的开发板做SPI实验,做传输的时候,片选引脚为低电平,可是实际拿示波器抓波形的时候,只有小浮动的波动,并没有拉低,怎么回事,
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我用DSPC6748的开发板做SPI实验,做传输的时候,片选引脚为低电平,可是实际拿示波器抓波形的时候,只有小浮动的波动,并没有拉低,怎么回事,