[LAU] Raspberry Pi and real-time, low-latency audio

Carlos sanchiavedraz csanchezgs at gmail.com
Wed Apr 17 07:49:16 UTC 2013


2013/4/15 Jeremy Jongepier <jeremy at autostatic.com>:
> On 04/15/2013 10:39 AM, Carlos sanchiavedraz wrote:
>>
>> Just a USB cable from RPi to an A/C to USB adapter, and UA25EX
>> connected direct to the USB on RPi.
>
>
> Check the current of the adapter, if it's somewhere around 1A you might need
> a more powerful adapter as the RPi already draws 700mA IIRC.

The adapter is the same as that ones to charge mobile phones, just an
adapter from USB to a switch. I thought it would be enough to plug the
UA to the RPi and not having to plug it to an USB powered hub, because
then it may occur problems with other devices plugged in it, and this
would probably increase problems with audio latency and such.

>
>
>> IIRC, when configuring using raspi-config, the Modest preset for
>> overclocking just increases the CPU freq from 700MHz to 800MHz. I
>> didn't want to risk my SD because I red that issue you mention, but it
>> seems that anyway I've left without my SD.
>>
>
> What kind of SD are you using? I've used different SD cards with different
> results. I'm now using a cheap OEM class 10 SD card that does get corrupted
> quickly but performance is better than other SD cards I've used. Whenever I
> change something I make a backup now.

I'm using a SanDisk 2GB microSD on a SD adapter for the RPi slot. I
never had any problem until now.

Do you still can use yours once it is corrupted? I plug it, you can
see the two partitions  mounted for a moment but then it unmount
itself. I made a backup copy with dd once I configured some
parameters. I've and tried several times to transfer it to the SD with
dd again but at about 840MB transfered it stops with a corruption
error; I only can modify the scripts and config on the first partition
(boot partition) when it stays mounted for some time.

This could allow me to maybe boot a system in a USB stick, but then I
waste one USB slot, and I'm afraid that if I buy another SD card it
could be corrupted again and then it would be wasted money.

>
> Jeremy
>
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-- 
Carlos sanchiavedraz
* Musix GNU+Linux
  http://www.musix.es


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