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I've also swapped out the DAC for a CODEC, the QICPCM3060:
I couldn't get the PCM3060 to slave to the SAMD51, so I made it the master, and the SAMD51 the slave, which required rewriting the Arduino code.
Here's the basic ChirpInterp code from Demo4 with the necessary changes in setup:
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And here's the beginnings of an effects processor – the 51 reading from the CODEC and writing it back out:
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