TIDA-01454: Configuring I2S CMB in AM5729

Hello

I am trying to receive sound from  the CMB into my Beaglebone AI. I have followed this https://www.ti.com/lit/an/sprac97/sprac97.pdf and managed to set the driver, since I can see the capture device like this:

debian@beaglebone:/etc$ arecord -l
**** List of CAPTURE Hardware Devices ****
card 1: PCM5102a [PCM5102a], device 0: davinci-mcasp.0-pcm5102a-hifi pcm5102a-hifi-0 []
  Subdevices: 1/1
  Subdevice #0: subdevice #0

or 

debian@beaglebone:/etc$ aplay -l
**** List of PLAYBACK Hardware Devices ****
card 0: H58040000encode [HDMI 58040000.encoder], device 0: HDMI 58040000.encoder snd-soc-dummy-dai-0 []
  Subdevices: 1/1
  Subdevice #0: subdevice #0
card 1: PCM5102a [PCM5102a], device 0: davinci-mcasp.0-pcm5102a-hifi pcm5102a-hifi-0 []
  Subdevices: 1/1
  Subdevice #0: subdevice #0

I have configured the pins this way:

P9.12                                171 fast rx down  0 mcasp 0 rx clk   mcasp@48460000 (mcasp1_pins)
P9.27b                               172 fast rx       0 mcasp 0 rx fs    mcasp@48460000 (mcasp1_pins)
P9.18b                               173 fast rx       0 mcasp 0 d0       mcasp@48460000 (mcasp1_pins)

But I dont fully understand the changes that must be made in ALSA configuration since my asound.conf splits channels:

pcm.onboard{
    type hw
    card 0
}
ctl.onboard {
    type hw
    card 0
}

### Dsnoop splited channels
pcm.onboard_capture_left {
     type dsnoop
     ipc_key 32
     slave {
         pcm "onboard"
         channels 2
	 rate 48000
    	 format S32_LE
     }
     bindings.0  0
}
pcm.onboard_playback_left {
     type dmix
     ipc_key 33
     slave {
         pcm "onboard"
         channels 2
     }
     bindings.0  0
}


pcm.onboard_capture_right {
     type dsnoop
     ipc_key 32
     slave {
         pcm "onboard"
         channels 2
	 rate 48000
	 format S32_LE
     }
     bindings.0  1
}
pcm.onboard_playback_right {
     type dmix
     ipc_key 33
     slave {
         pcm "onboard"
         channels 2
     }
     bindings.0  1
}


### PLUGS ##
### used with darkice
### device = plug:plug_onboard_left
pcm.plug_onboard_capture_left{
        type plug
        slave.pcm "onboard_capture_left"
}
pcm.plug_onboard_playback_left{
        type plug
        slave.pcm "onboard_playback_left"
}

pcm.!default {
    type asym
    playback.pcm "plug_onboard_playback_left"
    capture.pcm "plug_onboard_capture_left"
}

and i think this might be my problem because whenever I try to record something I get this error:

debian@beaglebone:/var/lib/cloud9$ arecord --device="hw:1,0" -d 20 -f S16_LE test.wav                                                                                                                                                                             
Recording WAVE 'test.wav' : Signed 16 bit Little Endian, Rate 8000 Hz, Mono
arecord: pcm_read:2145: read error: Input/output error

So what do I have to do?