Hi again,
We have written a small example that triggers this error (see the attached
files). From what we have figured out so far, the error arise from the result
of the p->wait_for_completion command in the transmit_cmd_and_wait function in
the usrp2_impl.cc
Be aware of the center_freq and the interface in the *_path files so it fits
your configuration.
Does anyone have a clue?
br,
Patrik
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Från: discuss-gnuradio-bounces+patrik.eliardsson=foi...@gnu.org
[discuss-gnuradio-bounces+patrik.eliardsson=foi...@gnu.org] för Patrik
Eliardsson [patrik.eliards...@foi.se]
Skickat: den 2 september 2010 15:39
Till: discuss-gnuradio@gnu.org
Ämne: [Discuss-gnuradio] usrp2::rx_samples() failed when switching rx_path
using the latest git_trunk
Hi,
What could be the reason for this error?
"usrp2: channel 0 not receiving
usrp2::rx_samples() failed"
>From some previously post, Johnathan said that this should be fixed in
>releases after 3.2.2
I'm using the latest git trunk version, I've change the firmware (to
txrx_raw_eth_20100608.bin) and the fpga image (to u2_rev3-20100603.bin) (I am
using USRP2 + RFX2400). And the error still occur! Why?
My top_block basically contains a usrp2_sink and a usrp2_source block and a
rx_path and a tx_path. The rx_path and the tx_path are changed during runtime
with the following sequence:
top_block.lock()
top_block.disconnect()
top_block.connect()
top_block.unlock()
The error occurs after a random number of switches of the different paths
(sometimes it works for 30 switches and sometimes just for 3) and the program
requires a restart to get rid of the problem.
Br,
Patrik Eliardsson
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#!/usr/bin/env python
from gnuradio import gr, gru
import time
import os
# from current dir
import isolate_tx_path
import isolate_rx_path
global mode
mode = "rx" #Default mode is rx
class my_top_block(gr.top_block):
def __init__(self):
gr.top_block.__init__(self)
self.rxpath = isolate_rx_path.usrp_receive_path()
self.txpath = isolate_tx_path.usrp_transmit_path()
self.connect(self.txpath);
self.connect(self.rxpath);
def main():
global mode
tb = my_top_block()
r = gr.enable_realtime_scheduling()
if r != gr.RT_OK:
print "Warning: failed to enable realtime scheduling"
print 'Blocked waiting for GDB attach (pid = %d)' % (os.getpid(),)
raw_input ('Press Enter to continue: ')
tb.start()
running = True
time.sleep(3)
while running:
if mode == "rx":
tb.lock()
tb.rxpath.disconnect(tb.rxpath.u, tb.rxpath.sink)
tb.rxpath.connect(tb.rxpath.u, tb.rxpath.idle)
tb.txpath.disconnect(tb.txpath.src, tb.txpath.head, tb.txpath.u)
tb.txpath.connect(tb.txpath.src, tb.txpath.u)
tb.unlock()
time.sleep(0.1)
print "."
mode = "tx"
if mode == "tx":
tb.lock()
tb.rxpath.disconnect(tb.rxpath.u, tb.rxpath.idle)
tb.rxpath.connect(tb.rxpath.u, tb.rxpath.sink)
tb.txpath.disconnect(tb.txpath.src, tb.txpath.u)
tb.txpath.connect(tb.txpath.src, tb.txpath.head, tb.txpath.u)
tb.unlock()
time.sleep(1)
mode = "rx"
if __name__ == '__main__':
try:
main()
except KeyboardInterrupt:
pass
#
# Copyright 2009 Free Software Foundation, Inc.
#
# This file is part of GNU Radio
#
# GNU Radio is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 3, or (at your option)
# any later version.
#
# GNU Radio is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with GNU Radio; see the file COPYING. If not, write to
# the Free Software Foundation, Inc., 51 Franklin Street,
# Boston, MA 02110-1301, USA.
#
from gnuradio import gr
from gnuradio import usrp2
class usrp_receive_path(gr.hier_block2):
def __init__(self):
'''
See below for what options should hold
'''
gr.hier_block2.__init__(self, "usrp_receive_path",
gr.io_signature(0, 0, 0), # Input signature
gr.io_signature(0, 0, 0)) # Output signature
self.sink = gr.null_sink(gr.sizeof_gr_complex)
self.idle = gr.null_sink(gr.sizeof_gr_complex)
self.u = usrp2.source_32fc("eth2","")
self.u.set_decim(128)
self.u.set_center_freq(2450e6)
self.connect(self.u, self.sink)#
# Copyright 2009 Free Software Foundation, Inc.
#
# This file is part of GNU Radio
#
# GNU Radio is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 3, or (at your option)
# any later version.
#
# GNU Radio is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with GNU Radio; see the file COPYING. If not, write to
# the Free Software Foundation, Inc., 51 Franklin Street,
# Boston, MA 02110-1301, USA.
#
from gnuradio import gr
from gnuradio import usrp2
class usrp_transmit_path(gr.hier_block2):
def __init__(self):
'''
See below for what options should hold
'''
gr.hier_block2.__init__(self, "usrp_transmit_path",
gr.io_signature(0, 0, 0), # Input signature
gr.io_signature(0, 0, 0)) # Output signature
sample_freq = 1
sin_freq = 0.1
amplitude = 1
offset = 0
self.src = gr.sig_source_c(sample_freq, gr.GR_SIN_WAVE, sin_freq, amplitude, offset)
n_samples = 256
self.head = gr.head(gr.sizeof_gr_complex, n_samples)
self.u = usrp2.sink_32fc("eth2","")
self.u.set_center_freq(2450e6)
self.u.set_interp(128)
self.connect(self.src, self.head, self.u)
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