Fix for mono mode for DAC Continuous/DMA Mode (idf5)

[dkaukov]

No description provided.

[pschatzmann]

I am not sure what kind of problem you try to solve, but using the current implementation with a (mono, 16bit at 44100 samples/second) output on an ESP32 Dev Module using the current ESP32 Arduino Core V3.1.3 (which uses IDF 5.3) gives the following output

[dkaukov]

Hi @pschatzmann,
Thank you for sharing the graph! However, I’m not entirely sure what it represents. If you specify DAC_CHANNEL_MODE_ALTER, the dac_continuous_new_channels() function expects interleaved samples. If the graph is an oscilloscope capture of the DAC output fed with a sine wave generator, it’s likely showing a frequency that is 2× the original due to the way the samples are being processed. Could you clarify how the data was captured?

[pschatzmann]

OK, I see: you are right! The frequency is indeed wrong...