It is a congenital deficiency of the RPi. It needs near realtime
response and an awfull amount of CPU to not drop usb transactions.
Search Rpi usb split transaction on google.
Emmanuel.
Le 03/03/2015 04:36, Silverfox a écrit :
I don't think it is unreasonable for the PI to cause overruns but
others may prove me wrong. It takes considerable horsepower to
process the data without overruns. However, if you aren't doing heavy
processing in the flowchart. FFT is probably the biggest consumer of
cycles.
73,
Alan - W6ARH
*From:*HackRF-dev [mailto:[email protected]]
*On Behalf Of *Derek Murphy
*Sent:* Monday, March 2, 2015 6:41 PM
*Cc:* [email protected]
*Subject:* Re: [Hackrf-dev] HackRF with Raspberry Pi 2 Overruns
Donald, I changed the sample to 2e6 and then up to 4e6, both way the
Overrun indicator starts to appear faster and then fills the terminal
window faster.
I am not sure if I have something wrong with the driver or kernel
config. It's a stock kernel from the raspbian distro. I tried a couple
of different USB ports on the pi with no change.
On Mon, Mar 2, 2015 at 2:22 PM, rgk <[email protected]
<mailto:[email protected]>> wrote:
I am currently building a completely portable pi 2 setup that runs off
of LIPOs. This is my intended purpose...IE my hackRF on my pi. I'm
very interested in what others have done similar to this.
------------------------------------------------------------------------
From: [email protected] <mailto:[email protected]>
Date: Mon, 2 Mar 2015 08:00:50 -0500
To: [email protected]
<mailto:[email protected]>
Subject: [Hackrf-dev] HackRF with Raspberry Pi 2 Overruns
I wanted to see if anyone has had similar experience with the
Raspberry Pi / Pi 2 with regards to the HackRF.
The USB port bandwidth was was around 18MB when I ran the transfer test.
When I get into GNU, I have a very simple example that show the
standard fft on coming from the hackrf source. I have the sample rate
set to 1.0e6 but also run into similar issues when I run at 64k. I get
the OOOOOO being posted and not just when I start the application.
Thanks
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