Poor AudioADC performance whenever AudioDAC or any DAC channels are enabled.

[y-sh1]

Hi,
I was looking at the auadc_audac_loopback example, and noticed that the quality of AudioADC decreases dramatically upon initializing the AudioDAC(!)

Apparently, this problem is associated with the setting of GPDAC_CH_A and / or GPDAC_CH_B.

Specifically, the following lines of code in bflb_audac.c are causing the audac to change its behavior(!?) :
if (config->output_mode & AUDAC_OUTPUT_MODE_GPDAC_CH_A) {
/* gpdac enable ch-A */
regval = getreg32(reg_base + GLB_GPDAC_ACTRL_OFFSET);
regval |= (GLB_GPDAC_A_EN | GLB_GPDAC_IOA_EN);
putreg32(regval, reg_base + GLB_GPDAC_ACTRL_OFFSET);
}

    if (config->output_mode & AUDAC_OUTPUT_MODE_GPDAC_CH_B) {
        /* gpdac enable ch-A */
        regval = getreg32(reg_base + GLB_GPDAC_BCTRL_OFFSET);
        regval |= (GLB_GPDAC_B_EN | GLB_GPDAC_IOB_EN);
        putreg32(regval, reg_base + GLB_GPDAC_BCTRL_OFFSET);
    }
}

It seems that by setting GPDAC_CH_A/B the AudioADC precision decreases from 16 its to 12 bits, and the pga gain is not effective.

Same issue appears whenever enabling any of the DAC Channels, for example using:
bflb_dac_channel_enable(dac, DAC_CHANNEL_A);
bflb_dac_channel_enable(dac, DAC_CHANNEL_B);

Any ideas?

[y-sh1]

I forgot to mention that I am using BL616