example "i2s_adc_dac " in esp-idf ADC value is zero

[daiyinger]

when i run this example,the sample values always zero,even i connect the GPIO36(ADC1CH0 input) to VCC(3.3V)

[phonec]

Example "i2s_adc_dac" is working and correctly write recorded data in to DMA memory, if you return back to the "feature(I2S-ADC): add ADC mode for I2S" but after the "Merge branch 'feature/i2s_built_in_adc' into 'master'" it ceased.

[klaetze]

Hi,
I know this post is quite old, but i have the same problem. I am using esp-idf version 4.1 and i can't get the i2s_adc_dac-example to work.

Whenever the sample frequency is over 5 kHz the i2s_read()-Function returns only zeros.

Is there any known solution for this problem?