audio clarity issues while using the WM8904 audio codec

[Tharun123]

Hello everyone,

I am currently using the WM8904 audio codec in my project. The audio is stored in external flash memory, and I am reading it in chunks of 1024 bytes at a time. The audio format is 16-bit WAV with an 8000 Hz sample rate.

For playback, we are using a mono speaker. I have attached the schematic of our codec for reference.

Issue: The audio output is not clear. I have verified the data being read from the flash, and it matches the stored data.

I would like to know:

1. What audio formats (sample rate, bit width, clock configuration, etc.) are supported by the WM8904 codec?
2. How can I ensure proper reading and playback of audio from the flash memory?

[LCE]

1. read the datasheet of WM8904, which is not a product from ST

2. working source code... you're not telling us which STM32 you are using and how it is connected to the DAC

[Andrew Neil]

As @LCE said, you need to provide more details - please see the Posting Tips:

https://community.st.com/t5/community-guidelines/how-to-write-your-question-to-maximize-your-chances-to-find-a/ta-p/575228

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@Tharun123 wrote:

I have attached the schematic of our codec for reference.

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I think you forgot that?

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@Tharun123 wrote:

Issue: The audio output is not clear.

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What, exactly, do you mean by that?

• Too quiet?
• Distorted? give details
• other?

Have you viewed the output on an oscilloscope?

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@Tharun123 wrote:

1. What audio formats (sample rate, bit width, clock configuration, etc.) are supported by the WM8904 codec?

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It's not an ST Product - you need to consult the manufacturer's specifications & other supporting documentation for that:

https://www.cirrus.com/products/wm8904/

https://www.cirrus.com/products/wm8904/#supportRequest=true&formType=design&supportProduct=wm8904