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PCM1794 如何实现音量控制

Other Parts Discussed in Thread: OPA1612, PCM1794, PCM1792

目前,我们用 PCM1794 + OPA1612 做了一款机顶盒,PCM1794 通过 I2S 和 CPU 连接,通过硬件对 PCM1794 进行配置,板子回来在测试的时候发现无法通过软件实现音量控制,请问如何实现音量控制,谢谢!