Where are the MIC Array interface information of the Rock Pi S PoE hat?

#1

I can not get the detailed information about the MIC Array interface etc of the Rock Pi S PoE hat!

There are only very simple GPIO pinout explanation on the Wiki .

#2

MIC Array interface information. See https://wiki.radxa.com/RockpiS/hardware/gpio

#3

I know where is the RockpiS GPIO info. But I wanna the MIC Array FPC interface pin info on the hat. Thanks.

#4

Another question: the headphone interface from hat has no any sound.

rock@rockpis:~$ aplay -l
**** List of PLAYBACK Hardware Devices ****
card 0: Loopback [Loopback], device 0: Loopback PCM [Loopback PCM]
  Subdevices: 8/8
  Subdevice #0: subdevice #0
  Subdevice #1: subdevice #1
  Subdevice #2: subdevice #2
  Subdevice #3: subdevice #3
  Subdevice #4: subdevice #4
  Subdevice #5: subdevice #5
  Subdevice #6: subdevice #6
  Subdevice #7: subdevice #7
card 0: Loopback [Loopback], device 1: Loopback PCM [Loopback PCM]
  Subdevices: 8/8
  Subdevice #0: subdevice #0
  Subdevice #1: subdevice #1
  Subdevice #2: subdevice #2
  Subdevice #3: subdevice #3
  Subdevice #4: subdevice #4
  Subdevice #5: subdevice #5
  Subdevice #6: subdevice #6
  Subdevice #7: subdevice #7
card 1: rockchiprk3308a [rockchip,rk3308-acodec], device 0: dailink-multicodecs rk3308-hifi-0 []
  Subdevices: 1/1
  Subdevice #0: subdevice #0

rock@rockpis:~$ aplay -v 1.wav
Playing WAVE '1.wav' : Signed 16 bit Little Endian, Rate 44100 Hz, Stereo
Hardware PCM card 1 'rockchip,rk3308-acodec' device 0 subdevice 0
Its setup is:
  stream       : PLAYBACK
  access       : RW_INTERLEAVED
  format       : S16_LE
  subformat    : STD
  channels     : 2
  rate         : 44100
  exact rate   : 44100 (44100/1)
  msbits       : 16
  buffer_size  : 22052
  period_size  : 5513
  period_time  : 125011
  tstamp_mode  : NONE
  tstamp_type  : MONOTONIC
  period_step  : 1
  avail_min    : 5513
  period_event : 0
  start_threshold  : 22052
  stop_threshold   : 22052
  silence_threshold: 0
  silence_size : 0
  boundary     : 6207086186423386112
  appl_ptr     : 0
  hw_ptr       : 0
#6

I added FPC interface. See https://wiki.radxa.com/ROCKPI_S_PoE_HAT#FPC_pinout

While using aplay, you need to add option -D to specify card 1 and device 0.

#7

Please note here, the default is the card 1 and device 0. It’s the same with aplay command.

rock@rockpis:~$ aplay -D hw:CARD=rockchiprk3308a,DEV=0 -v 1.wav
Playing WAVE '1.wav' : Signed 16 bit Little Endian, Rate 44100 Hz, Stereo
Hardware PCM card 1 'rockchip,rk3308-acodec' device 0 subdevice 0
#8

After checking ROCK PI S POE schematic, I find that one GPIO must be set to high level.
That GPIO is GPIO0_B7 which provides function of audio mute.

Please try the following commands

echo 15 > /sys/class/gpio/export 
echo out > /sys/class/gpio/gpio15/direction 
echo 1 > /sys/class/gpio/gpio15/value

aplay -D plughw:1,0 01.wav

More details: https://wiki.radxa.com/ROCKPI_S_PoE_HAT#Usage%20of%20Headphone%20jack