我是用DSP28335外部接口与DAC7724通信,DA芯片的引脚除了数据载入LDAC和复位用普通IO口控制外,其余都和DSP28335外部接口的相应引脚相连,程序测试一直不对,输出的值一直是-10V,而且我只是让通道A输出,可是其他的3个通道也是-10V ,这个是怎么回事?
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