用TI评估板DM6437,用video_preview自带程序跑时,DAC B, DAC C, DAC D,都有输出信号,但是DAC A没有信号,请问怎么设置可以获取DAC A的输出信号
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用TI评估板DM6437,用video_preview自带程序跑时,DAC B, DAC C, DAC D,都有输出信号,但是DAC A没有信号,请问怎么设置可以获取DAC A的输出信号