Sampling Multiple Audio Channels with ADC

[da_hon5]

Hi,
I'm trying to sample 6 ADC channels with audio input (sample rate is 8000Hz) sequentially and write the samples in a buffer. What is the easiest method to do so? I already tried with the I2S peripheral and DMA but could not get it to work. Has anyone already done it and maybe got some example code?
Thanks in advance!