Reduced playback speed on Raspberry Pi Zero W

waveshare / WM8960-Audio-HAT

The drivers of [WM8960 Audio HAT] for Raspberry Pi

GNU General Public License v3.0

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Reduced playback speed on Raspberry Pi Zero W #16

Closed codingjoe closed 3 years ago

codingjoe commented 3 years ago

Hi there,

I just got board and speaker bundle. The setup worked perfectly fine. I just played the sample song and it only runs at a lower speed. Both playback speed and pitch are effected. I have tried aplay and ffplay same result. Both supposedly played at 44.1kHz which does match the sampling rate of the sample wav-file.

I am using a Raspberry Pi Zero W.

I haven't tried another Pi version yet, but it also doesn't matter, since I would need this to work on a zero, otherwise I could just use the sound card and a simple amplifier on a larger Pi board.

Best, Joe

codingjoe commented 3 years ago

Default PCM. pigpio uses one or both of PCM and PWM. If PCM is used then PWM is available for audio. If PWM is used then PCM is available for audio. If waves or hardware PWM are used neither PWM nor PCM will be available for audio.

The problem seems to be related to pigpiod. pigpiod uses PCM as a default peripheral clock, which or course is needed for the audio HAT and I2S. However, pigpiod can be started in PWM mode via:

sudo pigpiod -t 0