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Are you asking just how to write code for the ULP in general? That's pretty well documented, you either write it in assembler or with C macros. There's also a very useful helper library with some good examples as well.
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DAC cosine via ULP https://github.com/krzychb/dac-cosine
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InfluxDB
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ADV from Espressif: https://github.com/espressif/esp-idf/blob/e599b794bebebe66c6bb6d0af31a9451510ad3d4/examples/peripherals/i2s_adc_dac/main/app_main.c
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This is probably as close as you can get. (Pretty damned wild I'd you ask me!) https://github.com/bitluni/ULPSoundESP32