SPDIF output on LIME2

[robert.w]

Hello
i am testing A20 Lime 2 board as a audio player
Analog inputs and outputs working fantastic !

Only i have problen with Digital SDPIF output
i connect siple TTL to SPDIF converter to pin 24 (PB13) at GPIO3
Script is configured 
spdif_used = 1
spdif_dout = port:PB13<4><1><default><default>
unfortunely it not working - i have connected audio processor with spdif input, on oscilosscope also noting.
Any ideas ?
Robert

// edit
i just add  in /etc/modules
"sndspdif", "sunxi-sndspdif", "sunxi-spdif"  "sunxi-spdma" reboot and i see now in cat /proc/asound/cards
i see two cards:

0 [sunxicodec]
1 [sunxispdif]

so i see progress
but still no spdif at output.

//edit 2
all test was using VLC player

now i install Audacity (audio editor) and set as a output card sunxi-spdif: (hw:1,0) and IT WORKING !!!
now only to do to be able to play two cards in parallel analog and spdif

[youurayy]

Hi robert.w, or anybody else, could you give more info on how to get or make the "simple TTL to SPDIF converter", and how to connect it (to the A20 or similar)? I struggle to find more info on this.

Thanks!

[Gerrit]

if you mean to and optical output

just connect it to a TOTX178 module

http://pdf-datasheet.datasheet.netdna-cdn.com/pdfhtml/0295/571738/page1.png

you can find them on ebay and the other usual places

or this schematic for ttl - to spdif electrical

http://reza.net/cms/uploads/images/ttl2coax.png