BC127 set as a source to BT headphone with PCM IN

IoT Modules WiFi and Bluetooth Modules
1

Hi, I’m using a BC127 (A) with melody 7.2 and is set it up as a source and paired the headphone
SET PROFILES=2 2 0 2 2 1 2 1 0 0 1 0
the pairing with headphone works fine. When I push play on head phone I get back: “AVRCP_PLAY 11”

All work fine when i’m using an analog input, but i want to use the PCM input.

I’m using an other BC127 (B) PCM out with following setup.
SET PROFILES=2 0 3 0 2 1 2 1 0 0 1 0 (sink to phone)
SET AUDIO_DIGITAL=1 48000 1536 2100420 (PCM master)
SET AUDIO=1 1

connection between both BC127:
BC127 (B) to BC127(A)
PCM OUT to PCM IN
CLK to CLK
SYNC to SYNC
GND to GND

My set up for the BC127(A) (source to headphone):
SET PROFILES=2 2 0 2 2 1 2 1 0 0 1 0
SET AUDIO_DIGITAL=1 48000 1536 100420 (PCM Slave)
SET AUDIO=1 1

But, I don’t get any sound on my BT headphone

Any suggestions?
Thanks
Eric

2

I forgot.
-I have the pin SPI/PCM to ground on both BC127.
-I can see a signal with my oscilloscope on PCM out of BC127(B) when I play music from phone.

3

@ericpellaton,

Have you tried setting the ROUTE on the unit explicitly? It is probably set to 0 (auto) which generally works but some time you do need to specificially tell the unit where to route the audio.

Regards

Matt

4

Thanks Matt,
Thanks, yes i have try the different routes.
Also tried rote 1 and 4
Also tried to put phone on call, see below.

reset
Sierra Wireless Copyright 2018
Melody Audio V7.2
Build: 1534785311
Ready
OPEN_OK 10 A2DP 08DF1FDAD5A5
OPEN_OK 11 AVRCP 08DF1FDAD5A5
ABS_VOL 11 84
OPEN_OK 12 AGHFP 08DF1FDAD5A5
REMOTE_VOLUME 12 C
route 10
OK
“no music…”
call 12 outgoing 1
OK
SCO_OPEN 12
CALL_OUTGOING 12
route 12
OK
" can hear some very very distorted music"
call 12 answer
OK
CALL_ACTIVE 12
call 12 end
OK
SCO_CLOSE 12
CALL_END 12
route 10
OK
“no music…”

is my set up ok?
I’m using an other BC127 (B) PCM out with following setup (sink to phone.
SET PROFILES=2 0 3 0 2 1 2 1 0 0 1 0 (sink to phone)
SET AUDIO_DIGITAL=1 48000 1536 2100420 (PCM master)
SET AUDIO=1 1

My set up for the BC127(A) (source to headphone):
SET PROFILES=2 2 0 2 2 1 2 1 0 0 1 0
SET AUDIO_DIGITAL=1 48000 1536 100420 (PCM Slave)
SET AUDIO=1 1

Is there some codec i should setup.
Thanks again
Eric

5

It seems that I had a bad bc127 unit. got a new one and my setups work.
Thanks

6

hi, i know this post is from a while back but i’m facing the exact same problem.
I have the exact same setup and can’t seem to get the audio from a A2DP connected phone to BC127(B) to play through the PCM lines to BC127(A) out to a connected A2DP headphone…

If may ask you, which BC127 was bad in your case?
A or B ?

7

Update;
I have now got some audio from the analog output on BC127(A) but its very choppy and does not sound right. Also spontaneous some “call” commands are run on the BC127(B) where the A2DP sound is coming from.
All really weird.
I have planned to replace one of the two to make sure i’m not having a bad 127 two…
If anyone has advice please let me know :wink: