Go to advanced search

by JustCurious
Sun Sep 21, 2014 3:05 pm
Forum: Beginners
Topic: Speed of both USB ports
Replies: 5
Views: 736

Speed of both USB ports

The Pi has two USB ports. They are 2.0 HS ports. My Question is: does the 480Mbs bandwidth apply for both ports together, or for each port individually?
by JustCurious
Wed Sep 10, 2014 7:59 am
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: USB speed on Pi?
Replies: 8
Views: 1725

Re: USB speed on Pi?

It depends if your device is a USB full-speed or high-speed device. 192kHz/24bit exceeds the bandwidth capacity of the full-speed bus. If your device is receiving uncompressed audio then it must be a USB2.0 high-speed device. High-speed isochronous devices put far less strain on the host software t...
by JustCurious
Tue Sep 09, 2014 7:28 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: USB speed on Pi?
Replies: 8
Views: 1725

Re: USB speed on Pi?

When I roughly calculate 192khz/24bit stereo load, in (WiFi dongle), and out (DAC), then I come to approximately 20 to 30 Mbit/sec, which is largely below the theoretical limit of 480 Mbit/s. I estimate this shouldn't be a very big load for the Pi, or am I mistaking?
by JustCurious
Tue Sep 09, 2014 5:53 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: USB speed on Pi?
Replies: 8
Views: 1725

Re: USB speed on Pi?

The Pi also has problems recording from USB audio capture devices with certain sample rates http://www.raspberrypi.org/forums/viewtopic.php?f=63&t=79402 I have no idea how reliable 24bit 192kHz capture would be - as a guess probably not very well. If you serious need to record in this format then y...
by JustCurious
Tue Sep 09, 2014 5:07 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: USB speed on Pi?
Replies: 8
Views: 1725

USB speed on Pi?

What is the effective total USB speed the Pi can handle? Do the SD and Ethernet go over the USB circuitry?

I am asking this because I want to connect a 192khz/24bit DAC via USB.
by JustCurious
Sun Jun 29, 2014 8:45 am
Forum: Troubleshooting
Topic: Pi keeps stalling
Replies: 10
Views: 2275

Re: Pi keeps stalling

Thanks MrEngman! That works! :D
by JustCurious
Sat Jun 28, 2014 7:09 pm
Forum: Troubleshooting
Topic: Pi keeps stalling
Replies: 10
Views: 2275

Re: Pi keeps stalling

Lsusb: Bus 001 Device 002: ID 0424:9514 Standard Microsystems Corp. Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub Bus 001 Device 003: ID 0424:ec00 Standard Microsystems Corp. Bus 001 Device 004: ID 7392:7811 Edimax Technology Co., Ltd EW-7811Un 802.11n Wireless Adapter [Realtek RTL8...
by JustCurious
Thu Jun 26, 2014 10:08 am
Forum: Troubleshooting
Topic: Pi keeps stalling
Replies: 10
Views: 2275

Re: Pi keeps stalling

RaTTuS wrote:staling how ?
Ping times out and ssh/telnet get no response. (t.i. wirelessly)
by JustCurious
Thu Jun 26, 2014 8:57 am
Forum: Troubleshooting
Topic: Pi keeps stalling
Replies: 10
Views: 2275

Re: Pi keeps stalling

AndrewS wrote:Have you been in touch with IQaudIO ?
Yes. My DAC board will be examined by IQaudIO. But what are you aiming at exactly? :)
by JustCurious
Thu Jun 26, 2014 12:22 am
Forum: Troubleshooting
Topic: Pi keeps stalling
Replies: 10
Views: 2275

Pi keeps stalling

I use the RPi with Volumio and the Pi-DAC from IQaudIO. The RPi keeps stalling after a certain amount of time. Always when not operated (running though), and within between 10 minutes and 3 days.
by JustCurious
Sat Jun 21, 2014 3:56 pm
Forum: Troubleshooting
Topic: Which power supply for Pi?
Replies: 8
Views: 2167

Re: Which power supply for Pi?

drgeoff wrote:Yes a switch mode PSU is isolated from AC mains for safety reasons.
Is that really true? I noticed that in schematics that Google brings up there is no tranformer in most cases!
by JustCurious
Sat Jun 21, 2014 10:08 am
Forum: Troubleshooting
Topic: Which power supply for Pi?
Replies: 8
Views: 2167

Re: Which power supply for Pi?

Better in what sense? Switchers tend to be generate more electrical noise than linears. Exactly! That is wat I thought! I found a USB hub with linear power supply lingering around at my home and hooked it up with the Pi! It seems that the sound quality of my DAC has improved! Linear power supplies ...
by JustCurious
Fri Jun 20, 2014 10:55 pm
Forum: Troubleshooting
Topic: Which power supply for Pi?
Replies: 8
Views: 2167

Re: Which power supply for Pi?

Does anyone know if a switching power supply is decoupled from the mains? Can I plug it across my netfilter?

Which power supply type is better: Switching or regulated (non-switching)?
by JustCurious
Fri Jun 20, 2014 12:15 pm
Forum: Troubleshooting
Topic: Which power supply for Pi?
Replies: 8
Views: 2167

Which power supply for Pi?

I use the Pi as a audioserver with Volumio. I use the IQaudIO DAC extension. I suspect the sound quality can be significantly improved if I use a good power supply. I suspect I also get less malfunction from the Pi itself.

Anyone know a good power supply for the Pi?
by JustCurious
Thu Jun 19, 2014 9:24 am
Forum: Beginners
Topic: Parameters for telnet session?
Replies: 8
Views: 1579

Re: Parameters for telnet session?

Found it! :) (sorry for the misunderstanding... :( )

(Btw, it is plain 'pi' and 'raspberry' it turns out :) )
by JustCurious
Thu Jun 19, 2014 9:14 am
Forum: Beginners
Topic: Parameters for telnet session?
Replies: 8
Views: 1579

Re: Parameters for telnet session?

I don't know the difference between telnet and ssh. Which ssh clients are there for Windows?
by JustCurious
Wed Jun 18, 2014 10:59 pm
Forum: Beginners
Topic: Parameters for telnet session?
Replies: 8
Views: 1579

Parameters for telnet session?

Which parameters do I have to use to succesfully establish a telnet session with the Pi? (host=IP, username=guest and so).
by JustCurious
Sat Jun 14, 2014 3:11 pm
Forum: Beginners
Topic: STICKY: Getting Started with the Raspberry Pi
Replies: 313
Views: 1225484

Re: How to start using your Raspberry Pi

DougieLawson wrote:
JustCurious wrote:How can I determine if my charger delivers 5V exactly? Done with/without load?
If it is a stock USB or microUSB then you can be just about 100% sure it's 5V0 (unless it's something crappy and unsafe from China).
Ik purchased a Hama 2100mA...
by JustCurious
Sat Jun 14, 2014 3:10 pm
Forum: Beginners
Topic: STICKY: Getting Started with the Raspberry Pi
Replies: 313
Views: 1225484

Re: How to start using your Raspberry Pi

mahjongg wrote:
JustCurious wrote:How can I determine if my charger delivers 5V exactly? Done with/without load?
with the PI as load! Connect it to the PI, and power it up, use a multimeter to measure the voltage across the two supplied test points TP1 and TP2.
Where is TP1 located?
by JustCurious
Sat Jun 14, 2014 2:26 pm
Forum: Beginners
Topic: STICKY: Getting Started with the Raspberry Pi
Replies: 313
Views: 1225484

Re: How to start using your Raspberry Pi

How can I determine if my charger delivers 5V exactly? Done with/without load?
by JustCurious
Tue Jun 10, 2014 11:25 am
Forum: Beginners
Topic: SD-Card lock?
Replies: 9
Views: 1418

SD-Card lock?

Does the SD-Card have to be locked or unlocked?
by JustCurious
Mon Jun 09, 2014 3:16 pm
Forum: Beginners
Topic: Resources about Linux
Replies: 2
Views: 590

Re: Resources about Linux

Thanks jamesh! I tried to manage my linux laptop (mint), but when the knowlegde gets more demanding, I get stuck. So I hope this does not happen with the Pi, although it seems easier to start from the beginning with the Pi than with a laptop ;)
by JustCurious
Mon Jun 09, 2014 1:08 pm
Forum: Beginners
Topic: Resources about Linux
Replies: 2
Views: 590

Resources about Linux

If I want to learn more about managing and perhaps programming the RasPi in particular, which resources are the best to start with?

I have experience in Pascal and PHP.

Thanks in advance. :)
by JustCurious
Mon Jun 09, 2014 12:51 pm
Forum: Beginners
Topic: Heatsinks?
Replies: 6
Views: 1062

Re: Heatsinks?

There are heatsinks available. For what are they needed?
by JustCurious
Mon Jun 09, 2014 12:50 pm
Forum: Beginners
Topic: Powerconnector which one?
Replies: 3
Views: 555

Powerconnector which one?

Do I need an USB mini connector or an USB micro connector for the RasPi power?

Go to advanced search