> The ESP only has a 12 bit ADC and an 8 bit ADC.
12-bit dual ADC and 8-bit DAC. And I have not tested the ADC speed. Might be good enough to do Codec2, but since the ESP32 has a DMA interface for codec chips, it's easy to connect one.
The internal 12 bit ADC would be worth trying - we use a similar ADC on the STM32F4. The 8 bit DAC as well, especially if it can run a a high sample rate.
Remarkable amount of functionality/$, hardware just keeps getting cheaper :-)
Given it's a 200MHz-ish CPU with FPU, it should run Codec 2, and indeed the entire FreeDV stack, just fine.
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