Is this a problem with the RP B/B+ or the RP 2B or all of the above? All the RP's have the same IO chip, but the Pi 2B has a totally different CPU and that new chip on the bottom of the board. If I sound non-specific it's because I just got a Pi 2B and have had little time to research its new features and capabilities. I think if the IO chip is the problem (just not enough throughput) then what can be done to minimize the over run issues?
Date: Tue, 3 Mar 2015 08:45:01 +0100 From: [email protected] To: [email protected] Subject: Re: [Hackrf-dev] <DKIM> Re: HackRF with Raspberry Pi 2 Overruns 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]> 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] Date: Mon, 2 Mar 2015 08:00:50 -0500 To: [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 _______________________________________________ HackRF-dev mailing list [email protected] https://pairlist9.pair.net/mailman/listinfo/hackrf-dev No virus found in this message. Checked by AVG - www.avg.com Version: 2015.0.5751 / Virus Database: 4299/9207 - Release Date: 03/01/15 _______________________________________________ HackRF-dev mailing list [email protected] https://pairlist9.pair.net/mailman/listinfo/hackrf-dev _______________________________________________ HackRF-dev mailing list [email protected] https://pairlist9.pair.net/mailman/listinfo/hackrf-dev
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