Pi>DAC! - IQaudIO

!
!
!
Dear!customer,!!
!
thank!you!for!purchasing!one!of!our!IQaudIO!products.!!
!
This!document!covers!both!Pi>DAC!/!Pi>CASE!for!the!Raspberry!Pi!
AND!Pi>DAC+!/!Pi>CASE+!for!the!Raspberry!Pi!B+.!
!
If!there!is!something!missing!which!you!would!like!to!see!added!
[email protected]!
!
Yours!sincerely,!
!
The!IQaudIO!team!
!
!
!
Pi>DAC!is!covered!from!page!2!
!
Pi>DAC+!is!covered!from!page!21!
!
!
!
!
IQaudIO.com!Pi>DAC!/!Pi>CASE!instructions!
(For!Raspberry!Pi!B)!
#
This#document#covers#the#following#tasks:#
1) Connection#of#the#IQaudIO.com#PiEDAC#onto#your#Raspberry#Pi#
2) Building#the#Raspberry#Pi#/#PiEDAC#into#your#PiECASE#
3) Updating#Raspbian#from#the#Raspberry#Pi#to#include#PiEDAC#support#
4) The#cross#compilation#of#the#Linux#Kernel#to#support#the#PiEDAC#
5) Obtaining#audio#from#the#Raspberry#Pi#through#the#PiEDAC#
6) Common#Linux#distribution#configurations#
7) Extreme#hacking#(Raspberry#Pi#Pins)#
8) Physical#details#
#
#
1) Connection!of!the!IQaudIO.com!Pi>DAC!onto!your!Raspberry!Pi!
#
WARNING:#ENSURE#YOU#HAVE#DISCONNECTED#YOUR#RASPBERRY#PI#FROM#POWER#
BEFORE#ATTEMPTING#THIS#PROCEDURE#
#
The#PiEDAC#requires#the#supplied#female#2x4#header#to#be#soldered#to#the#Raspberry#Pi#on#the#
top#side#P5#holes#–#as#indicated#by#the#pictures#below.##
#
If#your#Raspberry#Pi#has#already#had#a#different#header#soldered#in#place#it#should#be#removed#
from#the#Raspberry#Pi#or#an#alternative#Raspberry#Pi#should#be#used#for#the#PiEDAC.#
#
Once#fitted#the#Raspberry#Pi#should#look#as#below#
#
v8#28/9/2014#
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#
#
#
2#
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The#12mm#PCB#standoff#should#then#be#screwed#to#the#PiEDAC.##
#
#
#
Once#secure#the#PiEDAC#should#be#pressed#onto#the#Raspberry#Pi’s#2x13#I/O#header#and#P5#
header#and#the#PCB#standoff#should#be#screwed#to#the#Raspberry#Pi#itself.#
#
#
v8#28/9/2014#
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#
#
#
#
#
#
3#
Apply#power#to#your#Raspberry#Pi#in#the#normal#way.##You#should#see#that#the#Raspberry#Pi#
and#the#IQaudIO.com#PiEDAC#both#have#power#LEDs#–#this#indicates#that#the#power#is#
successfully#being#applied#to#the#PiEDAC.##
#
#
You#can#now#remove#power#and#reconnect#any#necessary#peripherals#you#may#need.#
#
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v8#28/9/2014#
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4#
2) Building!the!Raspberry!Pi!/!Pi>DAC!into!your!Pi>CASE!
#
The#following#may#prove#helpful#when#building#your#PiECASE.##
#
a)#First,#if#you#are#using#the#PiEDAC#spacer#and#screws#have#these#connected#already.#Then#lay#
out#the#sides#corresponding#to#the#Raspberry#Pi#/#PiEDAC#PCB.##
#
b)#Then,#build#the#sides#up#around#the#Raspberry#Pi.#
#
#
v8#28/9/2014#
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#
#
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#
5#
c)#Add#the#top#(without#text)##
#
#
d)#Carefully#flip#the#combination#on#its#top#allowing#you#to#add#the#PiECASE#base#
#
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v8#28/9/2014#
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6#
e)#PiECASE#base#in#place#
#
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f)#Now#add#the#4#nuts#and#bolts#–#Do#not#over#tighten,#finger#tight#is#OK#
#
#
v8#28/9/2014#
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7#
g)#Completed#PiECASE#with#Raspberry#Pi#and#PiEDAC#inside#
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8#
3) Updating!Raspbian!from!the!Raspberry!Pi!to!include!Pi>DAC!support!
!
This#guide#assumes#you#are#using#the#Raspbian#(Debian#Wheezy)#distribution#from#here:#
http://www.raspberrypi.org/downloads/#and#that#you#have#an#SD#card#flashed#with#
Raspbian#and#have#a#login#to#your#Raspberry#Pi#(either#local#or#via#ssh).#You#should#have#also#
run#raspiEconfig#and#expanded#the#filesystem#to#occupy#your#full#SD#card.#
#
• Update#the#Raspbian#on#the#SD#card#to#be#the#latest#available.#
#
•
#
pi@raspberrypi ~ $ sudo rpi-update
You#must#enable#i2C#support#for#the#PiEDAC#to#operate.#On#the#Raspberry#Pi#check#if#you#
have#the#following#file#and#if#so#delete#the#line#containing#i2cEbcm2708.#
pi@raspberrypi ~ $#sudo nano /etc/modprobe.d/raspi-blacklist.conf
Delete#the#line#containing#the#text#below#if#it#exists#
#
#
•
#
blacklist i2c-bcm2708
To#ensure#that#the#necessary#kernel#modules#are#loaded#at#boot,#you#must#add#the#
following#lines#to#/etc/modules#
pi@raspberrypi ~ $#sudo nano /etc/modules
snd_soc_bcm2708
snd_soc_bcm2708_i2s
bcm2708_dmaengine
#
•
snd_soc_pcm512x
snd_soc_iqaudio_dac
Flush#your#filesystem#changes#and#reboot#the#Raspberry#Pi#
pi@raspberrypi ~ $#sync
pi@raspberrypi ~ $#sudo reboot
#
Once#restarted#SSH#into#the#Pi#and#check#that#the#audio#drivers#/#card#is#available#to#ALSA.#
#
pi@raspberrypi ~ $ aplay -l
#
If#the#IQaudIO.com#PiEDAC#and#drivers#have#been#installed#correctly#you#should#see#
something#similar#to:#
#
pi@raspberrypi#~#$#aplay#El#
****#List#of#PLAYBACK#Hardware#Devices#****#
card#0:#sndrpiiqaudioda#[snd_rpi_iqaudio_dac],#device#0:#IQaudIO#DAC#HiFi#pcm512xEhifiE0#[]#
##Subdevices:#1/1#
##Subdevice##0:#subdevice##0#
#
#
#
v8#28/9/2014#
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9#
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4) The!cross!compilation!of!the!Linux!Kernel!to!support!the!Pi>DAC!
#
This#section#assumes#you#understand#the#cross#compilation#build#process#and#the#transfer#of#a#
generated#Linux#kernel#and#modules#to#the#Raspberry#Pi.#This#is#for#advanced#users#only.#
#
If#you#would#rather#update#Raspbian#directly#on#the#Pi#(see#section!2#above)#or#take#a#preE
configured#image#(see#section#5)#later#in#this#document.#
#
The#Raspberry#Pi#Linux#source#(https://github.com/raspberrypi/linux/tree/rpiE3.14.y)#now#contains#
builtEin#support#for#the#IQaudIO.com#PiEDAC.#The#following#instructions#are#based#around#this#
source.#
#
• Create#a#suitable#directory...#
#
From#your#Linux#PC,#make#suitable#build#directories:##
#
•
gordon@BuildPC ~ $#mkdir ~/linux_iqaudio
gordon@BuildPC ~ $#mkdir ~/linux_iqaudio/modules
gordon@BuildPC ~ $#cd ~/linux_iqaudio
Point#to#your#cross#compile#toolchain#(your#setup#may#be#different)#and#set#variables#
gordon@BuildPC ~ $#export CCPREFIX=/home/gordon/tools/arm-bcm2708/gcclinaro-arm-linux-gnueabihf-raspbian/bin/arm-linux-gnueabihfOR
gordon@BuildPC ~ $#export CCPREFIX=/usr/bin/arm-linux-gnueabigordon@BuildPC ~ $#KERNEL_SRC=~/linux_iqaudio/linux
#
•
gordon@BuildPC ~ $#MODULES_TEMP=~/linux_iqaudio/modules/
Clone#the#source#
gordon@BuildPC ~ $#git init
#
•
•
gordon@BuildPC ~ $#git clone https://github.com/raspberrypi/linux.git
Now’s#a#good#time#for#a#tea#break#–#the#duration#will#depend#on#your#internet#connection#
and#your#PC’s#performance.#
#
Build#the#system#
gordon@BuildPC ~ $#cd ~/linux_iqaudio/linux
gordon@BuildPC ~ $#make mrproper
gordon@BuildPC ~ $#make ARCH=arm bcmrpi_defconfig
gordon@BuildPC ~ $#ARCH=arm CROSS_COMPILE=${CCPREFIX} make menuconfig
#
v8#28/9/2014#
#
#
#
#
#
10#
After#menuconfig#is#built#it#should#auto#run#and#you#will#be#presented#with#a#range#of#
menus,#to#ensure#that#the#IQaudIO.com#PiEDAC#is#enabled#follow#the#screenshots#
below…#
#
#
Scroll#down#and#select#Device#Drivers…#
#
#
#
Select#Sound#Card#Support#
#
v8#28/9/2014#
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#
#
#
11#
#
And#then#Advanced#Linux#Sound#Architecture#(ALSA)#
#
Then#ALSA#for#SoC#(system#on#chip)#audio#support#
#
Select#“Support#for#IQaudIOEDAC”#and#then#Exit#
#
#
#
#
#
#
#
v8#28/9/2014#
#
12#
Keep#selecting#Exit#until#you#reach#the#following#prompt…,#select#Yes#to#save#and#exit.#
#
#
#
Now#build#the#Linux#kernel#based#on#your#selection.#
#
•
#
gordon@BuildPC ~ $#ARCH=arm CROSS_COMPILE=${CCPREFIX} make -j6
Once#complete,#check#that#the#Codec#and#IQaudIO.com#PiEDAC#drivers#have#been#build.##
gordon@BuildPC ~ $ ls –l sound/soc/codecs/pcm512*
-rw-rw-r-- 1 gordon gordon 17432 Apr 6 14:23 sound/soc/codecs/pcm512x.c
-rw-rw-r-- 1 gordon gordon 5692 Apr 6 14:23 sound/soc/codecs/pcm512x.h
-rw-rw-r-- 1 gordon gordon 14768 Apr 6 14:46 sound/soc/codecs/pcm512x.o
#
gordon@BuildPC ~ $ ls –l sound/soc/bcm/iqaudio*
-rw-rw-r-- 1 gordon gordon 3118 Apr 6 14:23 sound/soc/bcm/iqaudio-dac.c
-rw-rw-r-- 1 gordon gordon 4856 Apr 6 14:46 sound/soc/bcm/iqaudio-dac.o
•
#
Build#the#modules#and#delete#the#unnecessary#links#
gordon@BuildPC ~ $#ARCH=arm CROSS_COMPILE=${CCPREFIX}
INSTALL_MOD_PATH=${MODULES_TEMP} make modules_install
•
Once#complete,#check#that#the#modules#have#been#build#as#expected…#
gordon@BuildPC ~ $ ls -l sound/soc/codecs/snd*
-rw-rw-r--rw-rw-r--rw-rw-r--rw-rw-r--
1
1
1
1
gordon
gordon
gordon
gordon
gordon 18456 Apr 10 15:08
gordon 2911 Apr 10 15:06
gordon 4416 Apr 10 15:08
gordon 14784 Apr 10 14:46
sound/soc/codecs/snd-soc-pcm512x.ko
sound/soc/codecs/snd-soc-pcm512x.mod.c
sound/soc/codecs/snd-soc-pcm512x.mod.o
sound/soc/codecs/snd-soc-pcm512x.o
gordon@BuildPC ~ $ ls -l sound/soc/bcm/snd*
-rw-rw-r--rw-rw-r--rw-rw-r--rw-rw-r--rw-rw-r--rw-rw-r--rw-rw-r--rw-rw-r--
•
1
1
1
1
1
1
1
1
gordon
gordon
gordon
gordon
gordon
gordon
gordon
gordon
gordon 11591 Apr 10 15:08 sound/soc/bcm/snd-soc-bcm2708-i2s.ko
gordon 2033 Apr 10 15:06 sound/soc/bcm/snd-soc-bcm2708-i2s.mod.c
gordon 3308 Apr 10 15:08 sound/soc/bcm/snd-soc-bcm2708-i2s.mod.o
gordon 9029 Apr 10 14:46 sound/soc/bcm/snd-soc-bcm2708-i2s.o
gordon 6532 Apr 10 15:08 sound/soc/bcm/snd-soc-iqaudio-dac.ko
gordon 1208 Apr 10 15:06 sound/soc/bcm/snd-soc-iqaudio-dac.mod.c
gordon 2408 Apr 10 15:08 sound/soc/bcm/snd-soc-iqaudio-dac.mod.o
gordon 4870 Apr 10 14:46 sound/soc/bcm/snd-soc-iqaudio-dac.o
Now#delete#the#unnecessary#symbolic#links#before#transferring#to#the#Pi…#
gordon@BuildPC ~ $#rm ~/linux_iqaudio/modules/lib/modules/3.10.36+/source
##
•
gordon@BuildPC ~ $#rm ~/linux_iqaudio/modules/lib/modules/3.10.36+/build
Make#the#kernel#image#(the#new#kernel.img#file#is#stored#in#this#mkimage#directory)#
gordon@BuildPC ~ $##cd ~/tools/mkimage
v8#28/9/2014#
#
#
#
#
13#
#
•
#
•
gordon@BuildPC ~ $ ./imagetool-uncompressed.py
${KERNEL_SRC}/arch/arm/boot/zImage
From#the#build#PC#copy#the#kernel#image#to#the#Pi's#home#directory#(here#the#Pi’s#
IPAddress#is#10.0.0.13)#
gordon@BuildPC ~ $#scp kernel.img [email protected]:.
From#the#Pi,#copy#the#kernel#to#the#boot#directory#
pi@raspberrypi ~ $#sudo cp /boot/kernel.img /boot/kernel.img.old
#
•
#
•
pi@raspberrypi ~ $#sudo cp ~/kernel.img /boot/kernel.img
From#the#Pi,#copy#the#modules#to#the#/boot/lib/#directory.#(Here#the#Build#PC’s#IPAddress#
is#10.0.0.3)#
pi@raspberrypi ~ $#sudo scp -r
[email protected]:/home/gordon/linux_iqaudio/modules/lib/* /lib/.
Flush#your#filesystem#changes#and#reboot#the#Raspberry#Pi#
pi@raspberrypi ~ $#sync
#
•
#
pi@raspberrypi ~ $#sudo reboot
You#must#enable#i2C#support#for#the#PiEDAC#to#operate.#On#the#Raspberry#Pi#check#if#you#
have#the#following#file#and#if#so#delete#the#line#containing#i2cEbcm2708.#
pi@raspberrypi ~ $#sudo nano /etc/modprobe.d/raspi-blacklist.conf
Delete#the#line#containing#the#text#below#if#it#exists#
#
#
•
#
blacklist i2c-bcm2708
To#ensure#that#the#necessary#kernel#modules#are#loaded#at#boot,#you#must#add#the#
following#lines#to#/etc/modules#
pi@raspberrypi ~ $#sudo nano /etc/modules
snd_soc_bcm2708
snd_soc_bcm2708_i2s
bcm2708_dmaengine
#
•
snd_soc_pcm512x
snd_soc_iqaudio_dac
Flush#your#filesystem#changes#and#reboot#the#Raspberry#Pi#
pi@raspberrypi ~ $#sync
#
#
pi@raspberrypi ~ $#sudo reboot
v8#28/9/2014#
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#
#
#
#
14#
5) Obtaining!audio!from!the!Raspberry!Pi!through!the!Pi>DAC!
#
Once#the#Linux#kernel#and#modules#have#been#copied#to#the#Raspberry#Pi#and#the#Linux#
configuration#has#been#changed#to#include#the#loading#of#the#IQaudIO.com#PiEDAC#at#boot#you#
should#now#be#able#to#listen#to#some#music.#
#
• Once#the#Raspberry#Pi#boots,#log#in#and#check#that#the#IQaudIO#PiEDAC#is#visible#as#an#
ALSA#audio#card#by#running#aplay#–l,#the#output#should#be#similar#to#that#below.#Note#the#
device#number#and#Subdevice#number#–#these#may#be#useful#to#you#when#configuring#
media#applications#to#access#the#PiEDAC#in#your#system.#
#
pi@raspberrypi ~ $ aplay –l
**** List of PLAYBACK Hardware Devices ****
card 0: sndrpiiqaudioda [snd_rpi_iqaudio_dac], device 0: IQaudIO DAC HiFi pcm512xhifi-0 []
Subdevices: 1/1
Subdevice #0: subdevice #0
#
•
Check#that#you#can#adjust#the#volume.#From#the#Raspberry#Pi#run#alsamixer.#If#you#have#
more#than#one#sound#card#installed#you#may#have#to#select#which#is#being#controlled#by#
pressing#the#F6#key.#
#
pi@raspberrypi ~ $ alsamixer
#
#
Now#adjust#the#volume#by#highlighting#“Playback#Digital”##(Press#your#cursor#keys#left#and#
right#to#select)#and#increase#/#decrease#the#volume#by#pressing#your#up#and#down#curson#
keys.##Remember#+0dB#is#full#volume,#E23.5dB#is#mute!#
#
Set#the#volume#at#around#30%#and#from#another#terminal#(or#exit#from#alsamixer#first)#
Test#that#audio#can#be#heard#through#the#PiEDAC.#Notice#the#hw#parameter#which#points#to#
device#0,#sub#device#0#in#the#example#below.#Change#these#values#depending#on#the#output#
of#the#aplay#–l#utility#above.#
#
v8#28/9/2014#
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#
#
#
15#
pi@raspberrypi ~ $ mplayer -ao alsa:device=hw=0,0 -nolirc
http://stream.radioactive.fm:8000/ractive
#
#
If#you#don’t#have#mplayer#already#installed:#
#
#
pi@raspberrypi ~ $ sudo apt-get update
#
pi@raspberrypi ~ $ sudo apt-get install mplayer
#
If#you#are#unable#to#detect#the#PiEDAC#(using#aplay#–l)#or#alsamixer#doesn’t#show#any#IQaudIO#
card#then#please#reEcheck#section#2#and#ensure#that#the#configuration#is#correct.#The#following#
commands#may#help#you#during#debug:#
#
#
pi@raspberrypi ~ $ dmesg
…
6.549255] pcm512x 1-004c: No SCLK, using BCLK: -2
6.556344] sd 0:0:0:0: Attached scsi generic sg0 type 0
6.570452] pcm512x 1-004c: Completed initialisation - pcm512x_probe
…
[
13.302381] snd-rpi-iqaudio-dac snd-rpi-iqaudio-dac.0: pcm512x-hifi <-> bcm2708i2s.0 mapping ok
[
[
[
pi@raspberrypi ~ $ lsmod
pi@volumio:~$ lsmod
Module
nfsd
ipv6
snd_soc_iqaudio_dac
bcm2708_dmaengine
virt_dma
snd_soc_pcm512x
sg
snd_soc_bcm2708_i2s
regmap_mmio
snd_soc_core
regmap_spi
snd_pcm
snd_page_alloc
regmap_i2c
snd_compress
v8#28/9/2014#
#
#
#
#
Size
243497
304050
2493
5108
2273
8913
18996
5474
2806
131292
1897
81593
5156
1645
8060
Used by
2
36
0
1
1 bcm2708_dmaengine
1
0
2
1 snd_soc_bcm2708_i2s
3 snd_soc_pcm512x,snd_soc_iqaudio_dac,snd_soc_bcm2708_i2s
2 snd_soc_pcm512x,snd_soc_core
2 snd_soc_core,snd_soc_iqaudio_dac
1 snd_pcm
2 snd_soc_pcm512x,snd_soc_core
1 snd_soc_core
16#
snd_seq
snd_timer
snd_seq_device
leds_gpio
led_class
snd
spi_bcm2708
i2c_bcm2708
53769
20133
6473
2059
3688
61291
4728
3997
0
2
1
0
1
6
0
0
snd_pcm,snd_seq
snd_seq
leds_gpio
snd_soc_core,snd_timer,snd_pcm,snd_seq,snd_seq_device,snd_compress
#
#
#
6) Common!Linux!distribution!configurations!
#
Linux#based#audio#/#media#distributions#and#the#configuration#file#contents#are#listed#below.#If#
you#have#other#information#you#would#like#to#see#added#to#this#documentation#then#please#
email#[email protected]#with#the#specific#details.#
#
a. Volumio!(Thanks!to!tracer5)!
!
#
Volumio!1.3:!
Since#13/6/2014,#Volumio#1.3#includes#the#necessary#Linux#modules#to#support#the#PiEDAC#but#does#
need#a#simple#change#to#the#/etc/mpd.conf#file#allowing#hardware#volume#control.#
#
Once#you#have#selected#the#IQaudIO#PiEDAC#within#Volumio’s#system#settings#and#rebooted.#SSH#
into#the#Pi#and#edit#/etc/mpd.conf#and#change#“PCM”#to#“Playback#Digital”#to#address#the#correct#
mixer#control#of#the#IQaudIO.com#PiEDAC.#Remember#to#save,#sync#and#reboot#for#these#changes#to#
take#effect.#
#
#
audio_output#{#
#
#################type###########"alsa"#
#################name###########"Output"#
#################device#########"hw:0,0"#
#################mixer_control##"Playback#Digital"#
#################mixer_device###"hw:0"#
#################mixer_index####"0"#
#################dsd_usb########"yes"#
}#
#
#
#
#
The!following!instructions!are!for!versions!of!Volumio!PRIOR!to!v1.3:!
#
Start#with#downloading#the#latest#beta#from#the#Volumio#site:##Raspberry#Pi#Volumio1.2beta#
#
Write#image#file#to#SD#card;#boot#image#on#Raspberry#Pi;#ssh#to#pi#
#
Update#the#kernel#and#firmware#
#
To!update!packages:!
#
sudo apt-get update && sudo apt-get upgrade
#
To!update!kernel:!
#
sudo apt-get update && sudo apt-get -y dist-upgrade
#
Use!the!Hexxeh!script!to!install!the!rpi>update!tool:!
v8#28/9/2014#
#
#
#
#
17#
#
sudo apt-get install rpi-update
#
sudo curl -L --output /usr/bin/rpi-update https://raw.github.com/Hexxeh/rpiupdate/master/rpi-update && sudo chmod +x /usr/bin/rpi-update
#
To!update!the!firmware:!
#
sudo rpi-update
#
Reboot!to!load!the!new!firmware.!
sudo reboot
#
Get#the#name#and#configuration#of#the#updated#linux#kernel#
#
uname -a
#
Mine#is:####3.10.36+##664#PREEMPT#
#
Configure!Linux!to!load!the!IQaudIO!modules!
Edit:#/etc/modules#to#look#like#this…#
#
snd_soc_bcm2708
snd_soc_bcm2708_i2s
bcm2708_dmaengine
snd_soc_pcm512x
snd_soc_iqaudio_dac
#
#
Ensure!the!changes!are!committed!to!the!SD!card!and!reboot!
sync
sudo reboot
#
The#Raspberry#Pi#with#IQAudIO#PiEDac#should#now#be#working.#
#
Note1:#In#MPD#System#settings#do#not#Activate#I2S#driver#as#it#will#overwrite#the#/etc/modules#file#
with#the#HiFiBerry#values.#
#
Note2:#If#you#would#like#volume#control#then#edit#/etc/mpd.conf#to#address#the#correct#mixer#
control#of#the#IQaudIO.com#PiEDAC#have#the#following#in#audio_output#section…#
##
audio_output#{#
#
#################type###########"alsa"#
#################name###########"Output"#
#################device#########"hw:0,0"#
#################mixer_control##"Playback#Digital"#
#################mixer_device###"hw:0"#
#################mixer_index####"0"#
#################dsd_usb########"yes"#
#
}#
#
#
!
!
#
b. RuneAudio!
!
Alpha#0.3#includes#support#for#the#IQaudIO.com#PiEDAC.##
#
v8#28/9/2014#
#
#
#
#
18#
#
7) Extreme!hacking!(Raspberry!Pi!Pins)!
#
For#those#who#want#to#do#things#like#Power#the#PiEDAC#from#a#separate#power#source#than#the#
Raspberry#Pi#itself#the#following#may#be#of#help#although#we#do#not#recommend#using#the#PiE
DAC#in#this#way.#
#
The#following#Pi#Pins#need#to#be#connected#to#the#corresponding#PiEDAC#headers#for#audio#to#
work.#We#recommend#that#the#other#Raspberry#Pi#ground#pins#are#also#connected.#
#
P1#(26way):# 3#(I2C#SDA)#
5#(I2S#SCL)##
17#(3.3v)#
#
P5#(8#way):# 1#(5v)#
2#(3.3v)#
4#(I2S#LRCK)#
6#(I2S#DATA)#
8#(GND)#
#
#
#
v8#28/9/2014#
#
#
#
#
19#
#
8) Physical!Details!
#
For#those#who#need#to#know#the#physical#characteristics#/#positions#of#the#phono#connectors#
when#connected#the#PiEDAC#is#connected#to#the#Raspberry#Pi.#(all#sizes#in#mm)#
#
#
v8#28/9/2014#
#
#
#
#
20#
!
IQaudIO.com!Pi>DAC+!/!Pi>CASE+!instructions!
(For!Raspberry!Pi!B+)!
#
This#document#covers#the#following#tasks:#
1) Connection#of#the#IQaudIO.com#PiEDAC+#onto#your#Raspberry#Pi#
2) Building#the#Raspberry#Pi#/#PiEDAC+#into#your#PiECASE+#
3) Updating#Raspbian#from#the#Raspberry#Pi#to#include#PiEDAC+#support#
4) The#cross#compilation#of#the#Linux#Kernel#to#support#the#PiEDAC+#
5) Obtaining#audio#from#the#Raspberry#Pi#through#the#PiEDAC+#
6) Common#Linux#distribution#configurations#(and#ALSA#H/W#volume#control#name)#
7) Adding#the#optional#PIN#headers#to#the#PiEDAC+#
#
#
1) Connection!of!the!IQaudIO.com!Pi>DAC+!onto!your!Raspberry!Pi!
#
WARNING:#ENSURE#YOU#HAVE#DISCONNECTED#YOUR#RASPBERRY#PI#FROM#POWER#
BEFORE#ATTEMPTING#THIS#PROCEDURE#
#
The#PiEDAC+#can#be#connected#to#the#Raspberry#Pi’s#40way#pin#header#without#any#additional#
soldering.##
#
The#PiEDAC+#is#supplied#with#4x#PCB#spacers,#8x#screws#and#some#additional#OPTIONAL#I/O#
pin#headers.##
#
#
The#spacers#should#be#screwed#to#the#Raspberry#Pi#B+#before#adding#the#PiEDAC+.##
#
v8#28/9/2014#
#
#
#
#
21#
#
#
Once#the#PiEDAC+#has#been#fitted#the#remaining#screws#can#be#tightened#as#required.##
#
#
#
Apply#power#to#your#Raspberry#Pi#in#the#normal#way.##You#should#see#that#the#Raspberry#Pi#
and#the#IQaudIO.com#PiEDAC+#both#have#power#LEDs#–#this#indicates#that#the#power#is#
successfully#being#applied#to#the#PiEDAC+.##
#
#
You#can#now#remove#power#and#reconnect#any#necessary#peripherals#you#may#need.#
#
#
#
v8#28/9/2014#
#
#
#
#
22#
2) Building!the!Raspberry!Pi!/!Pi>DAC+!into!your!Pi>CASE+!
#
The#following#may#prove#helpful#when#building#your#PiECASE+.##
#
a)#First,#if#you#are#using#the#PiEDAC+#spacers#and#screws#have#these#connected#already.#Then#
lay#out#the#sides#corresponding#to#the#Raspberry#Pi#/#PiEDAC+#PCB.##
#
#
#
#
b)#Then,#build#the#sides#up#around#the#Raspberry#Pi.#
#
v8#28/9/2014#
#
#
#
#
#
#
#
23#
#
c)#Add#the#top#(without#text)##
#
d)#Carefully#flip#the#combination#on#its#top#allowing#you#to#add#the#PiECASE+#base#
#
#
v8#28/9/2014#
#
#
#
#
#
#
#
24#
e)#PiECASE+#base#in#place#
#
#
Now#add#the#4#nuts#and#bolts#–#Do#not#over#tighten,#finger#tight#is#OK#
#
f)#Completed#PiECASE+#with#Raspberry#Pi#and#PiEDAC+#inside#
#
#
#
v8#28/9/2014#
#
#
#
#
#
#
25#
3) Updating!Raspbian!from!the!Raspberry!Pi!to!include!Pi>DAC+!support!
!
This#guide#assumes#you#are#using#the#Raspbian#(Debian#Wheezy)#distribution#from#here:#
http://www.raspberrypi.org/downloads/#and#that#you#have#an#SD#card#flashed#with#
Raspbian#and#have#a#login#to#your#Raspberry#Pi#(either#local#or#via#ssh).#You#should#have#also#
run#raspiEconfig#and#expanded#the#filesystem#to#occupy#your#full#SD#card.#
#
• Update#the#Raspbian#on#the#SD#card#to#be#the#latest#available.#
#
•
#
pi@raspberrypi ~ $ sudo rpi-update
You#must#enable#i2C#support#for#the#PiEDAC+#to#operate.#On#the#Raspberry#Pi#check#if#you#
have#the#following#file#and#if#so#delete#the#line#containing#i2cEbcm2708.#
pi@raspberrypi ~ $#sudo nano /etc/modprobe.d/raspi-blacklist.conf
Delete#the#line#containing#the#text#below#if#it#exists#
#
#
•
#
blacklist i2c-bcm2708
To#ensure#that#the#necessary#kernel#modules#are#loaded#at#boot,#you#must#add#the#
following#lines#to#/etc/modules#
pi@raspberrypi ~ $#sudo nano /etc/modules
snd_soc_bcm2708
snd_soc_bcm2708_i2s
bcm2708_dmaengine
#
•
snd_soc_pcm512x
snd_soc_iqaudio_dac
Flush#your#filesystem#changes#and#reboot#the#Raspberry#Pi#
pi@raspberrypi ~ $#sync
pi@raspberrypi ~ $#sudo reboot
#
Once#restarted#SSH#into#the#Pi#and#check#that#the#audio#drivers#/#card#is#available#to#ALSA.#
#
pi@raspberrypi ~ $ aplay -l
#
If#the#IQaudIO.com#PiEDAC+#and#drivers#have#been#installed#correctly#you#should#see#
something#similar#to:#
#
pi@raspberrypi#~#$#aplay#El#
****#List#of#PLAYBACK#Hardware#Devices#****#
card#0:#sndrpiiqaudioda#[snd_rpi_iqaudio_dac],#device#0:#IQaudIO#DAC#HiFi#pcm512xEhifiE0#[]#
##Subdevices:#1/1#
##Subdevice##0:#subdevice##0#
#
#
#
v8#28/9/2014#
#
#
#
#
26#
#
4) The!cross!compilation!of!the!Linux!Kernel!to!support!the!Pi>DAC+!
#
This#section#assumes#you#understand#the#cross#compilation#build#process#and#the#transfer#of#a#
generated#Linux#kernel#and#modules#to#the#Raspberry#Pi.#This#is#for#advanced#users#only.#
#
If#you#would#rather#update#Raspbian#directly#on#the#Pi#(see#section!2#above)#or#take#a#preE
configured#image#(see#section#5)#later#in#this#document.#
#
The#Raspberry#Pi#Linux#source#(https://github.com/raspberrypi/linux/tree/rpiE3.14.y)#now#contains#
builtEin#support#for#the#IQaudIO.com#PiEDAC+.#The#following#instructions#are#based#around#
this#source.#
#
• Create#a#suitable#directory...#
#
From#your#Linux#PC,#make#suitable#build#directories:##
#
•
gordon@BuildPC ~ $#mkdir ~/linux_iqaudio
gordon@BuildPC ~ $#mkdir ~/linux_iqaudio/modules
gordon@BuildPC ~ $#cd ~/linux_iqaudio
Point#to#your#cross#compile#toolchain#(your#setup#may#be#different)#and#set#variables#
gordon@BuildPC ~ $#export CCPREFIX=/home/gordon/tools/arm-bcm2708/gcclinaro-arm-linux-gnueabihf-raspbian/bin/arm-linux-gnueabihfOR
gordon@BuildPC ~ $#export CCPREFIX=/usr/bin/arm-linux-gnueabigordon@BuildPC ~ $#KERNEL_SRC=~/linux_iqaudio/linux
#
•
gordon@BuildPC ~ $#MODULES_TEMP=~/linux_iqaudio/modules/
Clone#the#source#
gordon@BuildPC ~ $#git init
#
•
•
gordon@BuildPC ~ $#git clone https://github.com/raspberrypi/linux.git
Now’s#a#good#time#for#a#tea#break#–#the#duration#will#depend#on#your#internet#connection#
and#your#PC’s#performance.#
#
Build#the#system#
gordon@BuildPC ~ $#cd ~/linux_iqaudio/linux
gordon@BuildPC ~ $#make mrproper
gordon@BuildPC ~ $#make ARCH=arm bcmrpi_defconfig
gordon@BuildPC ~ $#ARCH=arm CROSS_COMPILE=${CCPREFIX} make menuconfig
#
v8#28/9/2014#
#
#
#
#
#
27#
After#menuconfig#is#built#it#should#auto#run#and#you#will#be#presented#with#a#range#of#
menus,#to#ensure#that#the#IQaudIO.com#PiEDAC#is#enabled#follow#the#screenshots#
below…#
#
#
Scroll#down#and#select#Device#Drivers…#
#
#
#
Select#Sound#Card#Support#
#
v8#28/9/2014#
#
#
#
#
28#
#
And#then#Advanced#Linux#Sound#Architecture#(ALSA)#
#
Then#ALSA#for#SoC#(system#on#chip)#audio#support#
#
Select#“Support#for#IQaudIOEDAC”#and#then#Exit#
#
#
#
#
#
#
#
v8#28/9/2014#
#
29#
Keep#selecting#Exit#until#you#reach#the#following#prompt…,#select#Yes#to#save#and#exit.#
#
#
#
Now#build#the#Linux#kernel#based#on#your#selection.#
#
•
#
gordon@BuildPC ~ $#ARCH=arm CROSS_COMPILE=${CCPREFIX} make -j6
Once#complete,#check#that#the#Codec#and#IQaudIO.com#PiEDAC#drivers#have#been#build.##
gordon@BuildPC ~ $ ls –l sound/soc/codecs/pcm512*
-rw-rw-r-- 1 gordon gordon 17432 Apr 6 14:23 sound/soc/codecs/pcm512x.c
-rw-rw-r-- 1 gordon gordon 5692 Apr 6 14:23 sound/soc/codecs/pcm512x.h
-rw-rw-r-- 1 gordon gordon 14768 Apr 6 14:46 sound/soc/codecs/pcm512x.o
#
gordon@BuildPC ~ $ ls –l sound/soc/bcm/iqaudio*
-rw-rw-r-- 1 gordon gordon 3118 Apr 6 14:23 sound/soc/bcm/iqaudio-dac.c
-rw-rw-r-- 1 gordon gordon 4856 Apr 6 14:46 sound/soc/bcm/iqaudio-dac.o
•
#
Build#the#modules#and#delete#the#unnecessary#links#
gordon@BuildPC ~ $#ARCH=arm CROSS_COMPILE=${CCPREFIX}
INSTALL_MOD_PATH=${MODULES_TEMP} make modules_install
•
Once#complete,#check#that#the#modules#have#been#build#as#expected…#
gordon@BuildPC ~ $ ls -l sound/soc/codecs/snd*
-rw-rw-r--rw-rw-r--rw-rw-r--rw-rw-r--
1
1
1
1
gordon
gordon
gordon
gordon
gordon 18456 Apr 10 15:08
gordon 2911 Apr 10 15:06
gordon 4416 Apr 10 15:08
gordon 14784 Apr 10 14:46
sound/soc/codecs/snd-soc-pcm512x.ko
sound/soc/codecs/snd-soc-pcm512x.mod.c
sound/soc/codecs/snd-soc-pcm512x.mod.o
sound/soc/codecs/snd-soc-pcm512x.o
gordon@BuildPC ~ $ ls -l sound/soc/bcm/snd*
-rw-rw-r--rw-rw-r--rw-rw-r--rw-rw-r--rw-rw-r--rw-rw-r--rw-rw-r--rw-rw-r--
•
1
1
1
1
1
1
1
1
gordon
gordon
gordon
gordon
gordon
gordon
gordon
gordon
gordon 11591 Apr 10 15:08 sound/soc/bcm/snd-soc-bcm2708-i2s.ko
gordon 2033 Apr 10 15:06 sound/soc/bcm/snd-soc-bcm2708-i2s.mod.c
gordon 3308 Apr 10 15:08 sound/soc/bcm/snd-soc-bcm2708-i2s.mod.o
gordon 9029 Apr 10 14:46 sound/soc/bcm/snd-soc-bcm2708-i2s.o
gordon 6532 Apr 10 15:08 sound/soc/bcm/snd-soc-iqaudio-dac.ko
gordon 1208 Apr 10 15:06 sound/soc/bcm/snd-soc-iqaudio-dac.mod.c
gordon 2408 Apr 10 15:08 sound/soc/bcm/snd-soc-iqaudio-dac.mod.o
gordon 4870 Apr 10 14:46 sound/soc/bcm/snd-soc-iqaudio-dac.o
Now#delete#the#unnecessary#symbolic#links#before#transferring#to#the#Pi…#
gordon@BuildPC ~ $#rm ~/linux_iqaudio/modules/lib/modules/3.10.36+/source
##
•
gordon@BuildPC ~ $#rm ~/linux_iqaudio/modules/lib/modules/3.10.36+/build
Make#the#kernel#image#(the#new#kernel.img#file#is#stored#in#this#mkimage#directory)#
gordon@BuildPC ~ $##cd ~/tools/mkimage
v8#28/9/2014#
#
#
#
#
30#
#
•
#
•
gordon@BuildPC ~ $ ./imagetool-uncompressed.py
${KERNEL_SRC}/arch/arm/boot/zImage
From#the#build#PC#copy#the#kernel#image#to#the#Pi's#home#directory#(here#the#Pi’s#
IPAddress#is#10.0.0.13)#
gordon@BuildPC ~ $#scp kernel.img [email protected]:.
From#the#Pi,#copy#the#kernel#to#the#boot#directory#
pi@raspberrypi ~ $#sudo cp /boot/kernel.img /boot/kernel.img.old
#
•
#
•
pi@raspberrypi ~ $#sudo cp ~/kernel.img /boot/kernel.img
From#the#Pi,#copy#the#modules#to#the#/boot/lib/#directory.#(Here#the#Build#PC’s#IPAddress#
is#10.0.0.3)#
pi@raspberrypi ~ $#sudo scp -r
[email protected]:/home/gordon/linux_iqaudio/modules/lib/* /lib/.
Flush#your#filesystem#changes#and#reboot#the#Raspberry#Pi#
pi@raspberrypi ~ $#sync
#
•
#
pi@raspberrypi ~ $#sudo reboot
You#must#enable#i2C#support#for#the#PiEDAC#to#operate.#On#the#Raspberry#Pi#check#if#you#
have#the#following#file#and#if#so#delete#the#line#containing#i2cEbcm2708.#
pi@raspberrypi ~ $#sudo nano /etc/modprobe.d/raspi-blacklist.conf
Delete#the#line#containing#the#text#below#if#it#exists#
#
#
•
#
blacklist i2c-bcm2708
To#ensure#that#the#necessary#kernel#modules#are#loaded#at#boot,#you#must#add#the#
following#lines#to#/etc/modules#
pi@raspberrypi ~ $#sudo nano /etc/modules
snd_soc_bcm2708
snd_soc_bcm2708_i2s
bcm2708_dmaengine
#
•
snd_soc_pcm512x
snd_soc_iqaudio_dac
Flush#your#filesystem#changes#and#reboot#the#Raspberry#Pi#
pi@raspberrypi ~ $#sync
#
#
pi@raspberrypi ~ $#sudo reboot
v8#28/9/2014#
#
#
#
#
#
31#
5) Obtaining!audio!from!the!Raspberry!Pi!through!the!Pi>DAC!
#
Once#the#Linux#kernel#and#modules#have#been#copied#to#the#Raspberry#Pi#and#the#Linux#
configuration#has#been#changed#to#include#the#loading#of#the#IQaudIO.com#PiEDAC+#at#boot#
you#should#now#be#able#to#listen#to#some#music.#
#
• Once#the#Raspberry#Pi#boots,#log#in#and#check#that#the#IQaudIO#PiEDAC#is#visible#as#an#
ALSA#audio#card#by#running#aplay#–l,#the#output#should#be#similar#to#that#below.#Note#the#
device#number#and#Subdevice#number#–#these#may#be#useful#to#you#when#configuring#
media#applications#to#access#the#PiEDAC#in#your#system.#
#
pi@raspberrypi ~ $ aplay –l
**** List of PLAYBACK Hardware Devices ****
card 0: sndrpiiqaudioda [snd_rpi_iqaudio_dac], device 0: IQaudIO DAC HiFi pcm512xhifi-0 []
Subdevices: 1/1
Subdevice #0: subdevice #0
#
•
Check#that#you#can#adjust#the#volume.#From#the#Raspberry#Pi#run#alsamixer.#If#you#have#
more#than#one#sound#card#installed#you#may#have#to#select#which#is#being#controlled#by#
pressing#the#F6#key.#
#
pi@raspberrypi ~ $ alsamixer
#
#
Now#adjust#the#volume#by#highlighting#“Playback#Digital”##(Press#your#cursor#keys#left#and#
right#to#select)#and#increase#/#decrease#the#volume#by#pressing#your#up#and#down#curson#
keys.##Remember#+0dB#is#full#volume,#E23.5dB#is#mute!#(Note#0db#~#85%#on#the#volume#
range)#
#
Set#the#volume#at#around#30%#and#from#another#terminal#(or#exit#from#alsamixer#first)#
Test#that#audio#can#be#heard#through#the#PiEDAC+.#Notice#the#hw#parameter#which#points#
to#device#0,#sub#device#0#in#the#example#below.#Change#these#values#depending#on#the#
output#of#the#aplay#–l#utility#above.#
v8#28/9/2014#
#
#
#
#
32#
#
pi@raspberrypi ~ $ mplayer -ao alsa:device=hw=0,0 -nolirc
http://stream.radioactive.fm:8000/ractive
#
#
If#you#don’t#have#mplayer#already#installed:#
#
#
pi@raspberrypi ~ $ sudo apt-get update
#
pi@raspberrypi ~ $ sudo apt-get install mplayer
#
If#you#are#unable#to#detect#the#PiEDAC#(using#aplay#–l)#or#alsamixer#doesn’t#show#any#IQaudIO#
card#then#please#reEcheck#section#2#and#ensure#that#the#configuration#is#correct.#The#following#
commands#may#help#you#during#debug:#
#
#
pi@raspberrypi ~ $ dmesg
…
6.549255] pcm512x 1-004c: No SCLK, using BCLK: -2
6.556344] sd 0:0:0:0: Attached scsi generic sg0 type 0
6.570452] pcm512x 1-004c: Completed initialisation - pcm512x_probe
…
[
13.302381] snd-rpi-iqaudio-dac snd-rpi-iqaudio-dac.0: pcm512x-hifi <-> bcm2708i2s.0 mapping ok
[
[
[
pi@raspberrypi ~ $ lsmod
pi@volumio:~$ lsmod
Module
nfsd
ipv6
snd_soc_iqaudio_dac
bcm2708_dmaengine
virt_dma
snd_soc_pcm512x
sg
snd_soc_bcm2708_i2s
regmap_mmio
snd_soc_core
regmap_spi
snd_pcm
snd_page_alloc
v8#28/9/2014#
#
#
#
#
Size
243497
304050
2493
5108
2273
8913
18996
5474
2806
131292
1897
81593
5156
Used by
2
36
0
1
1 bcm2708_dmaengine
1
0
2
1 snd_soc_bcm2708_i2s
3 snd_soc_pcm512x,snd_soc_iqaudio_dac,snd_soc_bcm2708_i2s
2 snd_soc_pcm512x,snd_soc_core
2 snd_soc_core,snd_soc_iqaudio_dac
1 snd_pcm
33#
regmap_i2c
snd_compress
snd_seq
snd_timer
snd_seq_device
leds_gpio
led_class
snd
spi_bcm2708
i2c_bcm2708
1645
8060
53769
20133
6473
2059
3688
61291
4728
3997
2
1
0
2
1
0
1
6
0
0
snd_soc_pcm512x,snd_soc_core
snd_soc_core
snd_pcm,snd_seq
snd_seq
leds_gpio
snd_soc_core,snd_timer,snd_pcm,snd_seq,snd_seq_device,snd_compress
#
#
#
6) Common!Linux!distribution!configurations!
#
Linux#based#audio#/#media#distributions#and#the#configuration#file#contents#are#listed#below.#If#
you#have#other#information#you#would#like#to#see#added#to#this#documentation#then#please#
email#[email protected]#with#the#specific#details.#
#
Note,#in#earlier#Linux#kernel#versions#the#Hardware#volume#mixer#is#known#as#“Playback#
Digital”.#On#more#recent#versions#of#the#kernel#this#Hardware#volume#mixer#control#is#known#
as#“PCM”.#Please#see#alsamixer#for#the#name#used#in#your#particular#kernel#version.#
#
a. Volumio!(Thanks!to!tracer5)!
!
#
Volumio!1.3:!
Since#13/6/2014,#Volumio#1.3#includes#the#necessary#Linux#modules#to#support#the#PiEDAC#but#does#
need#a#simple#change#to#the#/etc/mpd.conf#file#allowing#hardware#volume#control.#
#
Once#you#have#selected#the#IQaudIO#PiEDAC+#within#Volumio’s#system#settings#and#rebooted.#SSH#
into#the#Pi#and#edit#/etc/mpd.conf#and#change#“PCM”#to#“Playback#Digital”#to#address#the#correct#
mixer#control#of#the#IQaudIO.com#PiEDAC+.#Remember#to#save,#sync#and#reboot#for#these#changes#to#
take#effect.#
#
#
audio_output#{#
#
#################type###########"alsa"#
#################name###########"Output"#
#################device#########"hw:0,0"#
#################mixer_control##"Playback#Digital"#
#
//#Note#in#later#kernels#this#is#“PCM”#
#################mixer_device###"hw:0"#
#################mixer_index####"0"#
#################dsd_usb########"yes"#
}#
#
#
#
#
The!following!instructions!are!for!versions!of!Volumio!PRIOR!to!v1.3:!
#
Start#with#downloading#the#latest#beta#from#the#Volumio#site:##Raspberry#Pi#Volumio1.2beta#
#
Write#image#file#to#SD#card;#boot#image#on#Raspberry#Pi;#ssh#to#pi#
#
Update#the#kernel#and#firmware#
#
To!update!packages:!
#
sudo apt-get update && sudo apt-get upgrade
v8#28/9/2014#
#
#
#
#
34#
#
To!update!kernel:!
#
sudo apt-get update && sudo apt-get -y dist-upgrade
#
Use!the!Hexxeh!script!to!install!the!rpi>update!tool:!
#
sudo apt-get install rpi-update
#
sudo curl -L --output /usr/bin/rpi-update https://raw.github.com/Hexxeh/rpiupdate/master/rpi-update && sudo chmod +x /usr/bin/rpi-update
#
To!update!the!firmware:!
sudo rpi-update
#
Reboot!to!load!the!new!firmware.!
sudo reboot
#
Get#the#name#and#configuration#of#the#updated#linux#kernel#
uname -a
#
Mine#is:####3.10.36+##664#PREEMPT#
#
Configure!Linux!to!load!the!IQaudIO!modules!
Edit:#/etc/modules#to#look#like#this…#
#
snd_soc_bcm2708
snd_soc_bcm2708_i2s
bcm2708_dmaengine
snd_soc_pcm512x
snd_soc_iqaudio_dac
#
#
Ensure!the!changes!are!committed!to!the!SD!card!and!reboot!
sync
sudo reboot
#
The#Raspberry#Pi#with#IQAudIO#PiEDAC+#should#now#be#working.#
#
Note1:#In#MPD#System#settings#do#not#Activate#I2S#driver#as#it#will#overwrite#the#/etc/modules#file#
with#the#HiFiBerry#values.#
#
Note2:#If#you#would#like#volume#control#then#edit#/etc/mpd.conf#to#address#the#correct#mixer#
control#of#the#IQaudIO.com#PiEDAC+#have#the#following#in#audio_output#section…#
##
audio_output#{#
#
#################type###########"alsa"#
#################name###########"Output"#
#################device#########"hw:0,0"#
#################mixer_control##"Playback#Digital"#
#
#
//#Note#in#later#kernels#this#is#“PCM”#
#################mixer_device###"hw:0"#
#################mixer_index####"0"#
#################dsd_usb########"yes"#
#
}#
!
b. RuneAudio!
Alpha#0.3#includes#support#for#the#IQaudIO.com#PiEDAC+.##
#
c. PiCorePlayer!
IQaudIO.com#PiEDAC+#support#is#built#in.#
#
v8#28/9/2014#
#
#
#
#
35#
7) Adding!the!optional!PIN!headers!to!the!Pi>DAC+!
#
The#PiEDAC+#will#work#without#adding#any#additional#pin#headers.#The#pin#headers#supplied#
are#for#those#who#may#want#to#access#the#B+’s#GPIO#and#add#things#like#rotary#encoders,#LCD#
screens#or#IR#sensors.#
#
The#Pin#headers#supplied#with#the#PiEDAC+#should#be#added#in#the#following#way.#This#will#
allow#you#to#add#a#Future#PiEAMP+#without#further#effort.#
#
The#Straight#pin#headers#are#designed#for#pins#1E10#of#the#40way.#These#should#be#soldered#to#
the#TOP#of#the#PiEDAC+.#These#10#GPIO#will#then#be#reEexposed#on#the#PiEAMP+.#
#
#
#
The#RIGHT#ANGLED#Pin#headers#are#designed#for#pins#11E40#of#the#40way.#These#should#be#
soldered#UNDERNEATH#the#PiEDAC+#
#
#
v8#28/9/2014#
#
#
#
#
36#