Hi,
Is it possible to get BBB with Botic to act as a USB to i2S-converter, so one would get the same functionality as the Amanero board?
Is it possible to get BBB with Botic to act as a USB to i2S-converter, so one would get the same functionality as the Amanero board?
Yes, it partially can, but at current state its usability is far behind Amanero (fixed sampling rate, 16bit PCM only & large audio delay).
The DSD playback works well from MPD using original Botic image.
You can use that one for high-res or DSD playback until there will be better Botic kernel ready.
You can use that one for high-res or DSD playback until there will be better Botic kernel ready.
I think the botic driver does not load ...
I have Debian Jessie and MPD 0.18 installed on eMMC and had MPD running fine with ncmpc client and MPad app.
After that I installed the Botic 5 driver by these commands:
$ wget http://repo.ieero.com/pool/main/l/li...ross_armhf.deb
$ ar x linux-image-4.0.0-botic5_1cross_armhf.deb
$ tar xvzf data.tar.gz
I use only ext clock for 44.1 (16934400) and use I2S only to an ES9023 dac up to 24/192.
My /boot/uboot/uEnv.txt file is as follows:
#BBB pin mapping
#
P9_25 - A14/0 - mcasp0_ahclkx (oscillator) - GPIO3_21
P9_31 - A13/0 - mcaps0_aclkx (bit clock) - SPI1_SCLK
P9_29 - B13/0 - mcasp0_fsx (lr clock) - SPI1_D0
P9_30 - D12/0 - mcasp0_axr0 (data0) - SPI1_D1
#P9_41 - D13/0 - mcasp0_axr1 (data1) - GPIO3_20 shared pin with D14
#P9_?? - ?12/2 - mcasp0_axr2 (data2) - configurable, see bellow
#P9_27 - C13/2 - mcasp0_axr3 (data3) - GPIO3_19
P9_24 - D15/7 - uart1_txd (external masterclock switch) - GPIO0_15
#P9_26 - D16/7 - uart1_rxd (I2S/DSD format switch)- GPIO0_14
#P9_14 - U14/7 - gpmc_a2 (cape power switch) - EHRPWM1A
#
#Default mode (kernel param snd_soc_botic.pinconfig=default or not set)
#P9_42 - B12/2 - mcasp0_axr2 (data2) - GPIO3_18
#
#Compat mode (kernel param snd_soc_botic.pinconfig=compat)
#P9_28 - C12/2 - mcasp0_axr2 (data2) - SPI1_CS0 shared with HDMI audio output
#
#GND is available on any of these pins P9_{01,02,43,44,45,46}
#--------------------------------------------------------------
#
#Clocks configuration
snd_soc_botic.ext_masterclk=1
#
#DSD format switch configuration
snd_soc_botic.dsd_format_switch=0
#
#Channels configuration
snd_soc_botic.serconfig=I---
#
#DAI format
snd_soc_botic.dai_format=16385
#
#External masterclock frequencies
snd_soc_botic.clk_44k1=16394400
#snd_soc_botic.clk_48k=24576000
#
#Force BCLK/LRCLK ratio
snd_soc_botic.blr_ratio=64
/sys/module/snd_soc_botic/parameters is not present so I guess it is up to uEnv.txt to handle the setting ?
The command "cat /proc/asound/card0/pcm0p/sub0/hw_params" gives result "closed"
uname -r gives 4.1.12-ti-r29 which does not appear to be the botic driver.
What am I missing ?
I have Debian Jessie and MPD 0.18 installed on eMMC and had MPD running fine with ncmpc client and MPad app.
After that I installed the Botic 5 driver by these commands:
$ wget http://repo.ieero.com/pool/main/l/li...ross_armhf.deb
$ ar x linux-image-4.0.0-botic5_1cross_armhf.deb
$ tar xvzf data.tar.gz
I use only ext clock for 44.1 (16934400) and use I2S only to an ES9023 dac up to 24/192.
My /boot/uboot/uEnv.txt file is as follows:
#BBB pin mapping
#
P9_25 - A14/0 - mcasp0_ahclkx (oscillator) - GPIO3_21
P9_31 - A13/0 - mcaps0_aclkx (bit clock) - SPI1_SCLK
P9_29 - B13/0 - mcasp0_fsx (lr clock) - SPI1_D0
P9_30 - D12/0 - mcasp0_axr0 (data0) - SPI1_D1
#P9_41 - D13/0 - mcasp0_axr1 (data1) - GPIO3_20 shared pin with D14
#P9_?? - ?12/2 - mcasp0_axr2 (data2) - configurable, see bellow
#P9_27 - C13/2 - mcasp0_axr3 (data3) - GPIO3_19
P9_24 - D15/7 - uart1_txd (external masterclock switch) - GPIO0_15
#P9_26 - D16/7 - uart1_rxd (I2S/DSD format switch)- GPIO0_14
#P9_14 - U14/7 - gpmc_a2 (cape power switch) - EHRPWM1A
#
#Default mode (kernel param snd_soc_botic.pinconfig=default or not set)
#P9_42 - B12/2 - mcasp0_axr2 (data2) - GPIO3_18
#
#Compat mode (kernel param snd_soc_botic.pinconfig=compat)
#P9_28 - C12/2 - mcasp0_axr2 (data2) - SPI1_CS0 shared with HDMI audio output
#
#GND is available on any of these pins P9_{01,02,43,44,45,46}
#--------------------------------------------------------------
#
#Clocks configuration
snd_soc_botic.ext_masterclk=1
#
#DSD format switch configuration
snd_soc_botic.dsd_format_switch=0
#
#Channels configuration
snd_soc_botic.serconfig=I---
#
#DAI format
snd_soc_botic.dai_format=16385
#
#External masterclock frequencies
snd_soc_botic.clk_44k1=16394400
#snd_soc_botic.clk_48k=24576000
#
#Force BCLK/LRCLK ratio
snd_soc_botic.blr_ratio=64
/sys/module/snd_soc_botic/parameters is not present so I guess it is up to uEnv.txt to handle the setting ?
The command "cat /proc/asound/card0/pcm0p/sub0/hw_params" gives result "closed"
uname -r gives 4.1.12-ti-r29 which does not appear to be the botic driver.
What am I missing ?
Last edited:
P.S. I can connect to MPD and see al my albums in MPad.
I can select a song which appears in the playlist but nothing happens, time stays at 0:00 and no output in pins 29-30-31.
The 16 MHz input on pin 25 is present ( I have an oscilloscope 🙂
I can select a song which appears in the playlist but nothing happens, time stays at 0:00 and no output in pins 29-30-31.
The 16 MHz input on pin 25 is present ( I have an oscilloscope 🙂
P.S. (again)
I also have a /boot/uEnv.txt file which contains this kind of info: (this is only the first few lines of much more of similar tekst - here we also see the uname_r=4.1.12-ti-r29 ...)
#Docs: Beagleboard:U-boot partitioning layout 2.0 - eLinux.org
uname_r=4.1.12-ti-r29
##uuid=
#dtb=
##BeagleBone Black/Green dtb's for v4.1.x (BeagleBone White just works..)
##BeagleBone Black: HDMI (Audio/Video) disabled:
#dtb=am335x-boneblack-emmc-overlay.dtb
##BeagleBone Black: eMMC disabled:
#dtb=am335x-boneblack-hdmi-overlay.dtb
I also have a /boot/uEnv.txt file which contains this kind of info: (this is only the first few lines of much more of similar tekst - here we also see the uname_r=4.1.12-ti-r29 ...)
#Docs: Beagleboard:U-boot partitioning layout 2.0 - eLinux.org
uname_r=4.1.12-ti-r29
##uuid=
#dtb=
##BeagleBone Black/Green dtb's for v4.1.x (BeagleBone White just works..)
##BeagleBone Black: HDMI (Audio/Video) disabled:
#dtb=am335x-boneblack-emmc-overlay.dtb
##BeagleBone Black: eMMC disabled:
#dtb=am335x-boneblack-hdmi-overlay.dtb
You are missung the point.
Even if I would have made a mistake at the 44.1 frequency still 48k files shoud play fine.
The cause is deeper as the botic driver is not loaded and the command "cat /proc/asound/card0/pcm0p/sub0/hw_params" returns with the answer "closed" it is not the external clock setting.
Even if I would have made a mistake at the 44.1 frequency still 48k files shoud play fine.
The cause is deeper as the botic driver is not loaded and the command "cat /proc/asound/card0/pcm0p/sub0/hw_params" returns with the answer "closed" it is not the external clock setting.
In my system...
Music playing -
Music paused -
The Botic kernel is loaded and operating in both situations.
Music playing -
Code:
root@botic:/# cat /proc/asound/card0/pcm0p/sub0/hw_params
access: MMAP_INTERLEAVED
format: S32_LE
subformat: STD
channels: 8
rate: 44100 (44100/1)
period_size: 256
buffer_size: 4096Music paused -
Code:
root@botic:/# cat /proc/asound/card0/pcm0p/sub0/hw_params
closedThe Botic kernel is loaded and operating in both situations.
In my system the output for CHANNELS: is 2
PERIOD_SIZE: is 110
BUFFER_SIZE: is 1760
My question is should I change my settings to yours?
Is there a reason you have those settings?
I'd guess the "CHANNELS: 8" is that you are doing multi-channel amps?
What does the increased PERIOD & BUFFER do for you?
Thanks🙂
Hi @ichiban! If I were you I would not bother changing a working configuration! You are correct, I use 8 channels in ALSA to run a stereo 3-way crossover on the BBB and then the 6 output channels go to individual amp channels and drivers. If you compare the buffer and period per channel, yours is more generous than mine.
I have played with varying buffer and period sizes in MPD and squeezelite, in order to make the player run smoothly at all sample rates. In doing so, one thing I have noticed - and this is just an impression based on sound - is that large and small buffers seem to sound the same. That was not the case back when my player/crossover computer was a typical PC. Back then, the system sounded 'cleanest' when the buffers were as tight as possible. I speculate that the nice isolation of the BBB from the DACs (Hermes) is responsible for this advantage. The sound remains clean even with large buffers and with the BBB CPU running up to ~90% capacity. Pretty nice! 😉
I have played with varying buffer and period sizes in MPD and squeezelite, in order to make the player run smoothly at all sample rates. In doing so, one thing I have noticed - and this is just an impression based on sound - is that large and small buffers seem to sound the same. That was not the case back when my player/crossover computer was a typical PC. Back then, the system sounded 'cleanest' when the buffers were as tight as possible. I speculate that the nice isolation of the BBB from the DACs (Hermes) is responsible for this advantage. The sound remains clean even with large buffers and with the BBB CPU running up to ~90% capacity. Pretty nice! 😉
OK, I will leave well enough alone. Thank you for the reply. 🙂
One other question. Have you played around with distancing the BBB from the enclosure housing the DACs & IVs. Transporters? Just wondering if it would make a sonic difference at all.
Yes, my BBB & DACs are in separate enclosures that are linked by teleporters. I soldered the teleporter connections directly to Cronus and, on the other end, to the B3se. Each connection is 2 cm or less in length... Soldered input to the B3s is the one point that I believe avoids some noise from entering the system. (I even used solid-core silver wire - admittedly overkill!). I heard that wifi dongles are noisy and should be isolated from the rest of the system. For anything else, there are much more knowledgable people to comment on questions re layout!
Just a quick note for anyone looking to add Squeezelite to Botic v4
ChrisMmm's cheat sheet guide here:
http://www.diyaudio.com/forums/twisted-pear/258254-support-botic-linux-driver-40.html#post4182051
works real well for getting up and running very quickly, but the name of the Botic card has changed in V4, so in the startup line
then it all works nicely 🙂
cheers,
J
ChrisMmm's cheat sheet guide here:
http://www.diyaudio.com/forums/twisted-pear/258254-support-botic-linux-driver-40.html#post4182051
works real well for getting up and running very quickly, but the name of the Botic card has changed in V4, so in the startup line
This needs changing to be
for Botic V4
then it all works nicely 🙂
cheers,
J
Humble suggestion... Depending on your DAC, the resampling to 96k may or may not improve the sound - especially for 44.1k files.
To compare by starting squeezelite without resampling:
squeezelite -o hw:CARD=Botic -n Botic96 -a 16384:1024::
Continuing on my quest (see my posts 1510 / 1511) to get it working a few pages back I started all over again.
I first installed only the Botic driver on a standard Linux distro but did not get it working.
Now I installed the Botic distro with the V4 driver and copied it to eMMC.
The unexpected part was now that the /boot/uboot/uEnv.txt was empty so I still had to start from scratch to get the correct info in here.
With the previous setup you can see in post 1510 that I really did not know what I was doing but in the meantime I learnt a little more 😀
I dit not use the "optargs" function but now I set uEnv.txt like this:
optargs=fixrtc snd_soc_botic.ext_masterclk=1 snd_soc_botic.serconfig=I--- snd_soc_botic.dai_format=16385 snd_soc_botic.clk_44k1=16394400
I still have to connect it to my ES9023 dac to see if it works now.
In the meantime I am using a second BBB to play music through I2S with only the internal clock in standard (non-Botic) configuration.
Is the information for the uEnv.txt sufficient or am I still missing something ?
And is there any advantage for using Botic V5 instead of V4 as I do not need DSD ?
I only play PCM up to 24/192.
Thanks in advance.
I first installed only the Botic driver on a standard Linux distro but did not get it working.
Now I installed the Botic distro with the V4 driver and copied it to eMMC.
The unexpected part was now that the /boot/uboot/uEnv.txt was empty so I still had to start from scratch to get the correct info in here.
With the previous setup you can see in post 1510 that I really did not know what I was doing but in the meantime I learnt a little more 😀
I dit not use the "optargs" function but now I set uEnv.txt like this:
optargs=fixrtc snd_soc_botic.ext_masterclk=1 snd_soc_botic.serconfig=I--- snd_soc_botic.dai_format=16385 snd_soc_botic.clk_44k1=16394400
I still have to connect it to my ES9023 dac to see if it works now.
In the meantime I am using a second BBB to play music through I2S with only the internal clock in standard (non-Botic) configuration.
Is the information for the uEnv.txt sufficient or am I still missing something ?
And is there any advantage for using Botic V5 instead of V4 as I do not need DSD ?
I only play PCM up to 24/192.
Thanks in advance.
This will not work.
As pointed out in #1513 by francolargo, the clock frequency for 44k1 in optargs have to be the multiple of 2457600. Here, the "multiple" means an integer, implying the working frequencies such as 1 x 24576000, 2 x 24576000, and so on...