[Hackrf-dev] <DKIM> Re: HackRF with Raspberry Pi 2 Overruns

[Emmanuel Fusté]

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:hackrf-dev-bounces at greatscottgadgets.com] 
> *On Behalf Of *Derek Murphy
> *Sent:* Monday, March 2, 2015 6:41 PM
> *Cc:* hackrf-dev at greatscottgadgets.com
> *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 <rgkenders at hotmail.com 
> <mailto:rgkenders at hotmail.com>> 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: cyrus104 at gmail.com <mailto:cyrus104 at gmail.com>
> Date: Mon, 2 Mar 2015 08:00:50 -0500
> To: hackrf-dev at greatscottgadgets.com 
> <mailto:hackrf-dev at greatscottgadgets.com>
> 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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