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How to get rid of the "fade in" of PA/F on DA830?

Zhaosheng Pan
Prodigy 160 points
Other Parts Discussed in Thread: DA8XX

I am now running the PA/F I12 topology under Linux on the ARM of DA830. I have used execPAIInRingIO and execPAIOutAnalog, and I have sent writeVOLControlMasterN(0) and writePCMRampDisable. However I still hear the sound "fades in" each time when I execute "./pad pcm a.wav". How can I make the sound be in the normal volume at the very beginning? Thanks!