Strange values from Microphone

[pschatzmann]

I bought a AI-Thinker AudioKit 2.2 and most of the functions are working. However I am struggeling with the ADC function:

• input device: AUDIO_HAL_ADC_INPUT_LINE1
• sample rate: AUDIO_HAL_44K_SAMPLES
• bits per sample: AUDIO_HAL_BIT_LENGTH_16BITS
• I2S_COMM_FORMAT_STAND_I2S
• mode: AUDIO_HAL_CODEC_MODE_ENCODE
• The codec is slave

Here is the output:

18:34:27.412 -> 2, -32766
18:34:27.412 -> 32765, 32765
18:34:27.412 -> -32766, -32764
18:34:27.412 -> 1, 32767
18:34:27.412 -> 32764, 32762
18:34:27.450 -> 3, 2
18:34:27.450 -> -32767, -32768
18:34:27.450 -> 32765, -4
18:34:27.450 -> 32764, 32763
18:34:27.450 -> 5, -32762
18:34:27.450 -> 32761, 32762
18:34:27.450 -> -4, -2
18:34:27.450 -> 1, -32766
18:34:27.450 -> 32766, 32766
18:34:27.450 -> 32763, -6
18:34:27.450 -> -1, 0
18:34:27.450 -> 3, 4
18:34:27.450 -> 32762, -6
18:34:27.450 -> -32768, 32767
18:34:27.450 -> -32768, -32768
18:34:27.450 -> 32766, 0
18:34:27.450 -> 32765, 32765

Does anybody have a hint where the issue could be ?

[pschatzmann]

In order to define old IDF versions I used

define I2S_COMM_FORMAT_STAND_I2S (I2S_COMM_FORMAT_I2S | I2S_COMM_FORMAT_I2S_LSB)

But it should have been (I2S_COMM_FORMAT_I2S | I2S_COMM_FORMAT_I2S_MSB) !