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by MKSounds
Wed Aug 26, 2020 2:41 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: Bluetooth audio with AAC/Aptx (HD) via bluez-alsa
Replies: 2
Views: 332

Re: Bluetooth audio with AAC/Aptx (HD) via bluez-alsa

Raspberry Pi (formerly Raspbian Buster) ARMHF Operating System with Desktop uses bluez-alsa by default, this change was made when Raspbian Stretch was released: https://www.raspberrypi.org/blog/raspbian-stretch/ You will find many tutorials recommending PulseAudio, if so do not use as it conflicts....
by MKSounds
Wed Aug 19, 2020 10:05 am
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: Bluetooth audio with AAC/Aptx (HD) via bluez-alsa
Replies: 2
Views: 332

Bluetooth audio with AAC/Aptx (HD) via bluez-alsa

Hi, I did some research on bluetooth audio on the raspberry pi a few years ago. Back then all the bluetooth audio implementations used the a2dp protocol with the standard sbc codec. Totally uninteresting, because the transmission isn't lossless, making the as well not lossless base material e.g. mp3...
by MKSounds
Sat May 02, 2020 7:35 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: STICKY: The I2S sound thread. [I2S works]
Replies: 995
Views: 547995

Re: STICKY: The I2S sound thread. [I2S works]

Hi,
I was just wondering if it is necessary for newer kernel and hardware versions (e.g. Raspi 4) to change the compatible field in the dt overlays?
Can I use

Code: Select all

compatible = "brcm,bcm2708"
with the RPi 4 or do I need to change that to

Code: Select all

compatible = "brcm,bcm2835"
?
Regards, Markus
by MKSounds
Sat Feb 22, 2020 2:13 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: STICKY: The I2S sound thread. [I2S works]
Replies: 995
Views: 547995

Re: STICKY: The I2S sound thread.

Hi, I randomly red the description of the audio-graph-card (audio-graph-card.txt: https://github.com/raspberrypi/linux/blob/rpi-5.6.y/Documentation/devicetree/bindings/sound/audio-graph-card.txt ). I saw that this module has the capability to resample the audio data (convert-rate = <48000>; in Examp...
by MKSounds
Wed May 15, 2019 8:54 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: STICKY: The I2S sound thread. [I2S works]
Replies: 995
Views: 547995

Re: STICKY: The I2S sound thread.

Which kernel driver are you using? Codec drivers like spdif_rx support 16bit, 24bit (S24_LE) and 32bit (S32_LE, added to spdif-rx in kernel 4.16) and this is working fine - I've used 24bit recording with the Cirrus Logic audio card. Hi Hias/all, just red what you mentioned about the 32 bit support....
by MKSounds
Sun May 20, 2018 4:34 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: STICKY: The I2S sound thread. [I2S works]
Replies: 995
Views: 547995

Re: STICKY: The I2S sound thread.

Hi Hias,

thank's for your tip. Works perfect now.
by MKSounds
Sat May 19, 2018 3:19 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: STICKY: The I2S sound thread. [I2S works]
Replies: 995
Views: 547995

Re: STICKY: The I2S sound thread.

Hello! I'm right now applying a DSP to the Raspberry via I2S. I'm using a modified simple card overlay as posted a few pages before. The DSP runs in I2S master mode and provides the clocks for the raspberry. Therefore I configured the codec to be the master. That's the code I'm using, all needed mod...
by MKSounds
Fri Apr 27, 2018 1:29 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: Generic I2S Audio Driver
Replies: 0
Views: 523

Generic I2S Audio Driver

Hi, I'm trying to use the I2S audio output of the Pi as an input for a DSP. I was wondering if there isn't a generic driver/software device to simply use the I2S output (without any configuration via the I2C interface) ? What I would need: - 48 kHz sample rate - 24 bit - 3,072 MHz Bitclock (64 x fs)...

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