Playing with the ADAU1761 audio codec

I've been attempting to use the ADAU1761 chip, just using I2S audio stream generated by the PL section.

After a bit of playing I've at least got a 440Hz tone out of one channel of the headphones, so I'm slowly getting there.

I'm working towards at least a I2S loopback for playing with digital filters (e.g. Line In -> I2S -> PL -> I2S -> Line Out + Headphones).

Anyhow, in the spirit of release early, release often you can find the source at http://hamsterworks.co.nz/mediawiki/index.php/Zedboard_Audio

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0 Former Member over 11 years ago

Project now complete. LineIn / filters in Zynq's fabric / Headphone Out.

Overall gain should be about 0db, but haven't metered it.

Filter can be selected by SW0 and SW1, and are either
- Straight through
- 8 point moving average (6kHz low pass)
- 16 point moving average (3kHz low pass)
- 32 point moving average (1.5kHz low pass)

Warning - The design cuts straight between filters, so you will hear loud switching noise at full volume. So take you ear-buds out when playing with the switches

http://hamsterworks.co.nz/mediawiki/index.php/Zedboard_Audio
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0 Former Member over 11 years ago

Project now complete. LineIn / filters in Zynq's fabric / Headphone Out.

Overall gain should be about 0db, but haven't metered it.

Filter can be selected by SW0 and SW1, and are either
- Straight through
- 8 point moving average (6kHz low pass)
- 16 point moving average (3kHz low pass)
- 32 point moving average (1.5kHz low pass)

Warning - The design cuts straight between filters, so you will hear loud switching noise at full volume. So take you ear-buds out when playing with the switches

http://hamsterworks.co.nz/mediawiki/index.php/Zedboard_Audio
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