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by usul27
Mon Jun 13, 2016 8:14 pm
Forum: Troubleshooting
Topic: hcitool scan not listing Bluetooth devices
Replies: 2
Views: 4290

hcitool scan not listing Bluetooth devices

I'm having trouble scanning for bluetooth devices. blutoothctl shows a lot of BT devices around: root@raspberrypi# bluetoothctl [NEW] Controller B8:27:EB:76:70:7C raspberrypi [default] [bluetooth]# scan on Discovery started [CHG] Controller B8:27:EB:xx:xx:xx Discovering: yes [NEW] Device 88:C6:26:xx...
by usul27
Wed Aug 06, 2014 8:39 pm
Forum: HATs and other add-ons
Topic: Problem with i2c 0 bus
Replies: 19
Views: 5145

Re: Problem with i2c 0 bus

This might be the same problem discussed here:
http://www.raspberrypi.org/forums/viewt ... 00&t=82772
by usul27
Wed Aug 06, 2014 1:08 pm
Forum: HATs and other add-ons
Topic: Access to GPIO pins on HAT
Replies: 27
Views: 5636

Re: Access to GPIO pins on HAT

In my understanding there is no requirement for GPIO pass-trough, if this is what you mean. But somebody from the RPI foundation should confirm this.

Best regards
Daniel
by usul27
Thu Jul 31, 2014 3:13 pm
Forum: HATs and other add-ons
Topic: Kernel module loading
Replies: 1
Views: 1282

Kernel module loading

Hi,

is there already some documentation how to load kernel modules based on the content of the ID EEPROM?

Best regards
Daniel
by usul27
Thu Jul 24, 2014 7:34 pm
Forum: HATs and other add-ons
Topic: Accessing EEPROM on HAT
Replies: 4
Views: 3006

Re: Accessing EEPROM on HAT

Thanks, the workaround helped to get I2C running now. That's enough to go on for the moment. Looking forward to the documentation how to access the HAT EEPROM from the kernel.

Daniel
by usul27
Thu Jul 24, 2014 6:39 pm
Forum: HATs and other add-ons
Topic: Accessing EEPROM on HAT
Replies: 4
Views: 3006

Accessing EEPROM on HAT

Hi, I just tested my prototype for a new HiFiBerry DAC HAT, but have some problems accessing the EEPROM. I was looking for a hardware problem. After some hours of debugging, I noticed that the I2C communication seems to work. The EEPROM correctly sets the ACK bit at the end of the I2C communication....
by usul27
Tue Jul 22, 2014 9:03 pm
Forum: C/C++
Topic: Checking board revision
Replies: 10
Views: 2296

Re: Checking board revision

Is there any documentation how revisions will be handled in the future? Checking for revision>=0x10 works for now to distinguish between model B+ and "older" Raspberry Pis. But is there a risk that there will be new A or B versions with revisions>0x10?
by usul27
Tue Jul 22, 2014 8:39 pm
Forum: C/C++
Topic: Checking board revision
Replies: 10
Views: 2296

Re: Checking board revision

I need it on Linux, but in a kernel module. However the solution was much easier than expected:

extern int system_rev;

does the job :-)
by usul27
Tue Jul 22, 2014 8:21 pm
Forum: C/C++
Topic: Checking board revision
Replies: 10
Views: 2296

Re: Checking board revision

I can't use this from a kernel module, but I now know all revisions, which also helps.

Thanks
Daniel
by usul27
Tue Jul 22, 2014 7:34 pm
Forum: C/C++
Topic: Checking board revision
Replies: 10
Views: 2296

Re: Checking board revision

Ok, is there already a kernel routine to do this or do I have to implement it by myself? Couldn't see something yet. I just don't want to duplicate code that exists already.
by usul27
Mon Jul 21, 2014 4:45 pm
Forum: C/C++
Topic: Checking board revision
Replies: 10
Views: 2296

Checking board revision

As some alternative pins have changed from model B to B+, I need to update the kernel driver. I would like to distinguish between "old" and new B+ revision. How can I do this in a kernel driver?
by usul27
Wed Jul 16, 2014 11:31 am
Forum: General discussion
Topic: The Raspberry Pi Model B+ Q&A thread
Replies: 388
Views: 181086

Re: The Raspberry Pi Model B+ Q&A thread

Hows the i2c eeprom for board function going to be used, will there be config files for the bootloader etc? This is already under discussion here http://www.raspberrypi.org/forums/viewtopic.php?f=44&t=81733 Not much point discussing it as the specifications and software support hasn't been written ...
by usul27
Tue Feb 25, 2014 9:57 am
Forum: Français
Topic: [Attention !] HifiBerry - à éviter !
Replies: 14
Views: 10084

Re: [Attention !] HifiBerry - à éviter !

Dear dcarton, I'm sorry to hear that you are not satisfied with our support. Let us find a solution together. For me, it seems that the DAC is not exactly what you are looking for. I think, you are looking for a sound card with an ALSA mixer control. As we do our best to find the best solution for o...
by usul27
Sun Dec 22, 2013 8:53 pm
Forum: Graphics, sound and multimedia
Topic: PCM2704 USB DAC or HiFiBerry?
Replies: 17
Views: 31633

Re: PCM2704 USB DAC or HiFiBerry?

Not sure, what was the problem with PM, but we got it :-)
by usul27
Fri Dec 20, 2013 1:47 pm
Forum: Graphics, sound and multimedia
Topic: PCM2704 USB DAC or HiFiBerry?
Replies: 17
Views: 31633

Re: PCM2704 USB DAC or HiFiBerry?

HiFiBerry supports up to 192kHz/24bit, the PCM2704 only up to 48.1kHz. The specs (noise, distortion) of the HiFiBerry are also better then PCM2704 based cards. HiFiBerry uses an additional ultra-low-noise voltage regulator to provide a clean power supply for the analog part of the circuit. HiFiBerry...
by usul27
Fri Nov 08, 2013 12:42 pm
Forum: General discussion
Topic: Request for DSP documentation
Replies: 23
Views: 15374

Re: Request for DSP documentation

According to ARM, the DSP unit is a 16-bit unit. But I don't have any other information about it. However, I had a look on the Vector floating point unit. It looks quite interesting. It works with single and double precision. All single precision and even many double precision calculations need a si...
by usul27
Mon Nov 04, 2013 7:18 pm
Forum: Python
Topic: I2C with repeated start conditions
Replies: 0
Views: 622

I2C with repeated start conditions

Hi, I'm working n the project with the ADAU1701 that expects multiple start conditions in a single I2C communication. Is is somehow possible with Python to use repeated start conditions (see: http://www.i2c-bus.org/repeated-start-condition/ )? I use the SMBus module and it does not seem to support t...
by usul27
Mon Nov 04, 2013 4:10 pm
Forum: Graphics, sound and multimedia
Topic: Wolfson Pi Audio Card
Replies: 6
Views: 4863

Re: Wolfson Pi Audio Card

If you do not need the input and output, there is an I2S DAC available soon here:
http://www.crazy-audio.com/2013/10/hifi ... -solution/
by usul27
Sun Nov 03, 2013 11:26 am
Forum: Graphics, sound and multimedia
Topic: HiFiBerry DSP Light
Replies: 0
Views: 2518

HiFiBerry DSP Light

I have the prototype of my DSP board for the Raspberry Pi running. Not all features have been tested yet, but the analog output is already working. If everything is working, the board can be used as a sound card for the Raspberry (2 channel in, 2 channel out) our as a standalone pass-trough DSP. Pro...
by usul27
Thu Oct 24, 2013 1:59 pm
Forum: Graphics, sound and multimedia
Topic: Get 192khz/24bit working?
Replies: 10
Views: 15732

Re: Get 192khz/24bit working?

I got it running without USB by directly connecting to the I2S port of the SoC. Works well :-)
http://www.crazy-audio.com/2013/10/hifi ... -solution/

Thanks to all the guys that works on the drivers for this!
by usul27
Wed Oct 16, 2013 2:19 pm
Forum: Other projects
Topic: STICKY: The projects list. Look here for some ideas.
Replies: 233
Views: 389310

Re: The projects list. Look here for some ideas.

My DAC that directly connects to the P5 header:
Image
http://www.crazy-audio.com/projects/hifiberry-mini/
by usul27
Thu Sep 26, 2013 7:43 pm
Forum: Other projects
Topic: STICKY: The projects list. Look here for some ideas.
Replies: 233
Views: 389310

Re: The projects list. Look here for some ideas.

Finished a sound card that replaces the onboard sound. It is not using the I2S connector, but is connected by USB.
Image
http://www.crazy-audio.com/projects/hifiberry/
by usul27
Mon Nov 26, 2012 9:56 am
Forum: Other projects
Topic: STICKY: The projects list. Look here for some ideas.
Replies: 233
Views: 389310

Re: The projects list. Look here for some ideas.

I use the Raspberry Pi to broadcast audio over ethernet:
http://www.crazy-audio.com/projects/ras ... tribution/

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