Hi
I am beggining to suspect that there is something wrong with the xcvr2450 daughter board. Sorry I made a typo error last time and typed xcvr2458. When I use the 'loopback', which I understand does not need a daughterboard,I get perfect results. When I looked at usrp.py module in /usr/local/lib/python2.5/site-packages/gnuradio directory, I realised that its pick_rx_subdevice(u) and pick_tx_subdevice(u) functions did not contain usrp_dbid.XCVR2450_RX and usrp_dbid.XCVR2450_RX respectively. So I added these since the usrp_dbid.py module in /usr/local/lib/python2.5/site-packages/usrpm does have XCVR2450_RX and XCVR2450_RX. I thought I had found the reason but apparently not. I of course,tried to use , a = read_complex_binary('output.dat',inf);
as you had suggested but apparantly the problem lies elsewhere.Now I am quite confused.
Thank you.
Mutsa
--- On Fri, 12/12/08, Qi Chen <address@hidden> wrote:
From: Qi Chen <address@hidden>
Subject: Re: [Discuss-gnuradio] gr-sounder using xcvr2458 daughterboard - usrpsounder.py
To: address@hidden
Cc: address@hidden
Date: Friday, December 12, 2008, 7:02 AM
On Dec 12, 2008, at 3:29 AM, mutsa gahadza wrote:
> Dear all
>
> I have two debian host PCs and two USRPs. I have been trying to measure
Channel Impulse Response using usrpsounder.py.
>
> My command lines are as follows:
> # ./usrp_sounder.py -f 2.4G -r -v -D -F output.dat
> # ./usrp_sounder.py -f 2.4G -R A -t -v -D
>
> I then used
> a=read_complex_binary.m
you have to specify your binary file like this:
a = read_complex_binary('output.dat',inf);
>
> plot(abs(a))
> to see the result. I am consistently
getting zero values all the time.
>
> My output lines are as below:
>
>
***********************************************************************************
>
> gnuradio:/home/gnuradio/gnuradio/gr-sounder/src/python# ./usrp_sounder.py
-f 2.4G -R A -t -v -D
> Using PN code degree of 12 length 4095
> Sounding frequency range is 2.384G to 2.416G
> db_xcvr2450_tx: __init__
> Creating new xcvr2450 instance
> xcvr2450: __init__ with 47a50364: 0
> Using XCVR2450 Tx for sounder transmitter.
> Asserting reset.
> Writing mode register with: 0x1
> Setting transmitter frequency to 2.4G
> Setting PN code degree to 12
> Disabling digital loopback.
> Writing mode register with: 0x1
> De-asserting reset.
> Writing mode register with: 0x0
> Enabling transmitter.
> Writing mode register with: 0x2
> Press return to
exit.^CTraceback (most recent call last):
> File "./usrp_sounder.py", line 112, in <module>
> main()
> File "./usrp_sounder.py", line 109, in main
> raw_input("Press return to exit.")
> KeyboardInterrupt
> Disabling transmitter.
> Writing mode register with: 0x0
> xcvr2450: __del__
> gnuradio:/home/gnuradio/gnuradio/gr-sounder/src/python#
>
>
*****************************************************************************
>
> melag:/home/mutsag/gnuradio/gr-sounder/src/python# ./usrp_sounder.py -f
2.4G -r -v -D -F output.dat
> Using PN code degree of 12 length 4095
> Sounding frequency range is 2.384G to 2.416G
> Logging impulse records to file: output.dat
> db_xcvr2450_rx: __init__
> Creating new xcvr2450 instance
> xcvr2450: __init__ with 48571832: 1
> xcvr2450: Setting reg 2 to 030072
> xcvr2450: Setting
reg 5 to 038885
> xcvr2450: Setting reg 6 to 004006
> xcvr2450: Setting reg 7 to 000627
> xcvr2450: Setting reg 8 to 01C218
> xcvr2450: Setting reg 9 to 0068B9
> xcvr2450: Setting reg 10 to 003C0A
> xcvr2450: Setting reg 11 to 00010B
> xcvr2450: Setting reg 12 to 0003FC
> RF=2.45G VCO=3.26667G R=1 PHD=21.3333M DIV=153.12500 I=153 F= 8192
ACT=2.45G
> GPIO: RXRX=6000 RXTX=4000 TXRX=E010 TXTX=A810
> xcvr2450: Setting reg 3 to 000993
> xcvr2450: Setting reg 4 to 008004
> xcvr2450: Setting reg 5 to 038825
> lock detect: True
> Using <none> for sounder receiver.
> Setting receiver gain to None
> Generating impulse vectors of length 4095 byte length 32760
> Using smoothing alpha of 1.0
> Asserting reset.
> Writing mode register with: 0x1
> Setting receiver frequency to 2.4G
> Setting PN code degree to 12
> Disabling
digital loopback.
> Writing mode register with: 0x1
> De-asserting reset.
> Writing mode register with: 0x0
> Writing mode register with: 0x4
> Starting receiver flow graph.
> gr_buffer::allocate_buffer: warning: tried to allocate
> 4 items of size 32760. Due to alignment requirements
> 512 were allocated. If this isn't OK, consider padding
> your structure to a power-of-two bytes.
> On this platform, our allocation granularity is 4096 bytes.
> gr_buffer::allocate_buffer: warning: tried to allocate
> 4 items of size 32760. Due to alignment requirements
> 512 were allocated. If this isn't OK, consider padding
> your structure to a power-of-two bytes.
> On this platform, our allocation granularity is 4096 bytes.
> Enter CTRL-C to stop.
> Received impulse vector of length 32760
> Received impulse vector of length
32760
> Received impulse vector of length 32760
> Received impulse vector of length 32760
> Received impulse vector of length 32760
> Received impulse vector of length 32760
> Received impulse vector of length 32760
> Received impulse vector of length 32760
> Received impulse vector of length 32760
> Received impulse vector of length 32760
> Received impulse vector of length 32760
> Received impulse vector of length 32760
> Received impulse vector of length 32760
> Received impulse vector of length 32760
> Stopping receiver flow graph.
> Waiting for threads...
> Receiver flow graph stopped.
> Writing mode register with: 0x0
> xcvr2450: __del__
>
*****************************************************************************
>
>
>
>
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