en:c2_hifi_shield [ODROID Wiki]

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=====Quick installation guide to enable the I2S audio output on Ubuntu.=====
==== HiFi-shield & HiFi-Shield+ ====
{{http://www.hardkernel.com/main/_Files/prdt/2016/201605/201605181634077377.jpg?400|}}

The HiFi Shield Plus provides both stereo RCA connectors and a 3.5mm stereo jack (all gold-plated) to connect to external amplifiers and other audio equipment. An S/PDIF Optical output is also available.  Via TI's high-end PCM5102 DAC chip(known as Burr-Brown), it supports 16, 24, 32 bit audio formats with minimal distortion (-93dB) and ideal dynamics (110dB+), plus amazing sampling rates of 384kHz

  - Assemble the C2 with the HiFi shield, attach a USB keyboard, USB mouse and HDMI monitor, then power up the system.\\
  - Update the System: **sudo apt-get update && sudo apt-get dist-upgrade** \\
  - To ensure that the HiFi shield kernel modules are loaded on Terminal.\\ <code>
odroid@odroid64:~$ aplay -l
**** List of PLAYBACK Hardware Devices ****
card 0: ODROIDHDMI [ODROID-HDMI], device 0: I2S.27 dit-hifi-0 []
  Subdevices: 0/1
  Subdevice #0: subdevice #0
odroid@odroid64:~$
odroid@odroid64:~$ sudo modprobe snd-soc-pcm5102
odroid@odroid64:~$ sudo modprobe snd-soc-odroid-dac
odroid@odroid64:~$ aplay -l
**** List of PLAYBACK Hardware Devices ****
card 0: ODROIDHDMI [ODROID-HDMI], device 0: I2S.27 dit-hifi-0 []
  Subdevices: 1/1
  Subdevice #0: subdevice #0
card 1: ODROIDDAC [ODROID-DAC], device 0: I2S.27 pcm5102-0 []
  Subdevices: 1/1
  Subdevice #0: subdevice #0
odroid@odroid64:~$
</code>
  - To test, connect an amplifier to the 3.5mm or RCA lineout jack on the HiFi Shield, and then run:\\
  - Applications -> Sound & Video -> Sound -> Hardware Tab & Output Tab select "ODROID-DAC"\\
  - If you want to use the **Optical output** on HiFi-Shile-Plus model, select "ODROID-HDMI".\\

**If you have to load the driver every time whenever your ODROID-C2 starts, simply you can register the driver into /etc/modules **\\
<code>
odroid@odroid64:~$ su
Password:  /* root password is "odroid" */
root@odroid64:/home/odroid# echo "snd-soc-pcm5102" >> /etc/modules
root@odroid64:/home/odroid# echo "snd-soc-odroid-dac" >> /etc/modules
root@odroid64:/home/odroid# exit
exit
odroid@odroid64:~$ </code>
This adds one line at end of the file, /etc/modules, and load the driver on boot automatically.\\

**Create /etc/asound.conf with the following content:**
<code>
pcm.!default  {
 type hw card 1
}
ctl.!default {
 type hw card 1
}
</code>
Reboot again. \\

**Check, if the sound card is enabled with “aplay -l”:**
<code>
odroid@odroid64:~$ aplay -l
**** List of PLAYBACK Hardware Devices ****
card 0: ODROIDHDMI [ODROID-HDMI], device 0: I2S.27 dit-hifi-0 []
  Subdevices: 1/1
  Subdevice #0: subdevice #0
card 1: ODROIDDAC [ODROID-DAC], device 0: I2S.27 pcm5102-0 []
  Subdevices: 1/1
  Subdevice #0: subdevice #0
odroid@odroid64:~$
</code>

==== HiFi-shield2 ====
{{http://www.hardkernel.com/main/_Files/prdt/2016/201610/201610081156405325.jpg?800|}}

The HiFi Shield 2 provides stereo RCA connectors to connect to external amplifiers and other audio equipment. An S/PDIF Optical output is also available.
Via TI's high-end PCM5242 DAC chip(known as Burr-Brown), it supports 16, 24, 32 bit audio formats with minimal THD+N ratio (0.002%) and ideal dynamics (116dB+), plus amazing sampling rates of 384kHz. Volume control via I2C interface is great feature to keep the great audio quality with various audio output volume.

  - Assemble the C2 with the HiFi shield2, attach a USB keyboard, USB mouse and HDMI monitor, then power up the system.\\
  - Update the System: **sudo apt-get update && sudo apt-get dist-upgrade** \\
  - To ensure that the HiFi shield2 kernel modules are loaded on Terminal.\\ <code>
odroid@odroid64:~$ aplay -l
**** List of PLAYBACK Hardware Devices ****
card 0: ODROIDHDMI [ODROID-HDMI], device 0: I2S dit-hifi-0 []
  Subdevices: 1/1
  Subdevice #0: subdevice #0
odroid@odroid64:~$ su
Password:  /* root password is "odroid" */
root@odroid64:/home/odroid# modprobe aml_i2c
root@odroid64:/home/odroid# modprobe snd_soc_pcm512x
root@odroid64:/home/odroid# modprobe snd_soc_pcm512x_i2c
root@odroid64:/home/odroid# echo pcm5242 0x4c > /sys/class/i2c-adapter/i2c-1/new_device
root@odroid64:/home/odroid# modprobe snd-soc-odroid-dac2
root@odroid64:/home/odroid# aplay -l
**** List of PLAYBACK Hardware Devices ***
card 0: ODROIDHDMI [ODROID-HDMI], device 0: I2S dit-hifi-0 []
  Subdevices: 1/1
  Subdevice #0: subdevice #0
card 1: ODROIDDAC2 [ODROID-DAC2], device 0: I2S pcm512x-hifi-0 []
  Subdevices: 0/1
  Subdevice #0: subdevice #0
root@odroid64:/home/odroid#
</code>
  - To test, connect an amplifier to the RCA out jack on the HiFi Shield2, and then run:\\
  - Applications -> Sound & Video -> Sound -> Hardware Tab & Output Tab select "ODROID-DAC2"\\
  - If you want to use the **Optical output** select "ODROID-HDMI".\\

**You want to add the HiFi-Shield2 sound_card on ODROID-C2 at boot by editing /etc/rc.local. **\\
<code>
odroid@odroid64:~$ sudo nano /etc/rc.local
if [ -f /aafirstboot ]; then /aafirstboot start ; fi

echo Loading HiFi-Shield2 module
modprobe aml_i2c
modprobe snd_soc_pcm512x
modprobe snd_soc_pcm512x_i2c
echo pcm5242 0x4c > /sys/class/i2c-adapter/i2c-1/new_device
modprobe snd-soc-odroid-dac2

amixer -c 1 sset Analogue 0
amixer -c 1 sset Digital 201
amixer -c 1 sset Deemphasis on
echo Done.

exit 0

^G Get Help  ^O Write Out ^W Where Is  ^K Cut Text  ^J Justify   ^C Cur Pos
^X Exit      ^R Read File ^\ Replace   ^U Uncut Text^T To Linter ^_ Go To Line 
</code>
Add the following at the bottom of the page above exit 0. ^x exit and save the file. Reboot your ODROID-C2.\\

**Create /etc/asound.conf with the following content:**
<code>
pcm.!default  {
 type hw card 1
}
ctl.!default {
 type hw card 1
}
</code>
Reboot again. \\

**Check, if the sound card is enabled with “aplay -l”:**
<code>
odroid@odroid64:~$ aplay -l
**** List of PLAYBACK Hardware Devices ****
card 0: ODROIDHDMI [ODROID-HDMI], device 0: I2S dit-hifi-0 []
  Subdevices: 1/1
  Subdevice #0: subdevice #0
card 1: ODROIDDAC2 [ODROID-DAC2], device 0: I2S pcm512x-hifi-0 []
  Subdevices: 1/1
  Subdevice #0: subdevice #0
odroid@odroid64:~$ </code>