The latency is an issue when action of one side is dependent on reaction of the other side. Usually there are narrow time limits that have to be considered, and the time an action travels over USB or Ethernet may simply be to long. The other thing may be jitter, many protocols do not like variations in the timing, but those are more or less normal for USB or Ethernet. The closest binding between hardware and controller is doing it all in the FPGA, what could be considered as a real time system.
Ralph.
From: address@hidden [mailto:address@hidden On Behalf Of Mostafa Alizadeh
Sent: Tuesday, January 13, 2015 2:44 PM
To: Jeff Long
Cc: address@hidden
Subject: Re: [Discuss-gnuradio] Bluetooth Transmitter using GRC Yeah I have had a look at Bluetooth PHY. The hop rate of Bluetooth in paging substate increases as 3200 hop/sec too. So you mean the N210 USRP can't support 1600 (or 3200) hop/sec? What do you mean by "latency"? Is that the latency of the USB or Ethernet? Jeff, please clarify your stance. Why the latency problem doesn't matter X-series USRP? On Tue, Jan 13, 2015 at 3:02 PM, Jeff Long <address@hidden> wrote: On 01/12/2015 01:07 PM, Mostafa Alizadeh wrote: Hi Jeff,
What is your reason for saying: "Latency and tuning" of the N210 device
isn't appropriate???
I should have said that, with either USB or Ethernet, and with a non-real-time O/S, the latency to too great. Hop rate is generally 1600 hops/sec. Take a look at the Bluetooth physical layer spec for more info.
Best,
Mostafa
On Mon, Jan 12, 2015 at 2:52 PM, Jeff Long <address@hidden
<mailto:address@hidden>> wrote:
On 01/10/2015 02:46 PM, vaibhav kulkarni wrote:
Hi All,
I am searching for an implementation of a complete Bluetooth
stack on
GRC 3.7 ( Including the Bluetooth Transmitter and Receiver)
preferably
working with USRP N210. So far I got this "gr-Bluetooth,
Bluetooth for
You could build one in the FPGA of an X-series box. Latency and
tuning requirements exceed what you can do with a N210.
GNU Radio" (http://gr-bluetooth.__sourceforge.net/
<http://gr-bluetooth.sourceforge.net/>), However it is not a
complete stack and I guess it doesent include the Bluetooth
Transmitter.
I built it and checked but couldn't find one. Can you suggest any
existing implementation of complete Bluetooth stack ?
Any Help is appreciated.
Regards,
Vaibhav
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