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List: gnuradio-discuss
Subject: [Discuss-gnuradio] Changing frequency automatically
From: Rensi Mathew <rensisam () yahoo ! co ! in>
Date: 2018-08-29 6:06:24
Message-ID: 1548782806.189316.1535522784038 () mail ! yahoo ! com
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I am trying to implement this discussion:[Discuss-gnuradio] Change frequency in \
USRPsource automatically(https://lists.gnu.org/archive/html/discuss-gnuradio/2016-03/msg00402.html). \
My objective is to create a block which changes the frequency automatically in steps \
of 2e6, starting from 2.37e9.
My block has a code given below:
import stringimport numpy
import pmt
from gnuradio import gr
from gnuradio import digital
class frew_sweep_v1_f(gr.sync_block):
"""
docstring for block frew_sweep_v1_f
"""
def __init__(self,initial_freq=2.37e9, step=2e6):
gr.sync_block.__init__(self,
name="frew_sweep_v1_f",
in_sig=[],
out_sig=[])
self.message_port_register_in(pmt.intern('clock'))
self.message_port_register_out(pmt.intern('sync'))
self.set_msg_handler(pmt.intern('clock'),self.handler)
self.freq=initial_freq
self.step=step
def handler(self,pdu):
self.message_port_pub(pmt.intern('sync'),pmt.cons(pmt.intern("freq"),pmt.to_pmt(self.freq)))
self.freq+=self.step
the xml file has a code given below:
<?xml version="1.0"?>
<block>
<name>frew_sweep_v1_f</name>
<key>tutorial_frew_sweep_v1_f</key>
<category>[tutorial]</category>
<import>import tutorial</import>
<import>from gnuradio.digital import packet_utils</import>
<make>tutorial.frew_sweep_v1_f($initial_freq, $step)</make>
<callback>post_message($msg)</callback>
<param>
<name>message</name>
<key>msg</key>
<type>string</type>
</param>
<sink>
<name>in</name>
<type>message</type>
</sink>
<source>
<name>out</name>
<type>message</type>
</source>
</block>
I inserted this new block between a message block and message debug block.The new \
top_block code generated is given below:
if __name__ == '__main__':
import ctypes
import sys
if sys.platform.startswith('linux'):
try:
x11 = ctypes.cdll.LoadLibrary('libX11.so')
x11.XInitThreads()
except:
print "Warning: failed to XInitThreads()"
from PyQt4 import Qt
from gnuradio import digital
from gnuradio import blocks
from gnuradio import eng_notation
from gnuradio import gr
from gnuradio.digital import packet_utils
from gnuradio.eng_option import eng_option
from gnuradio.filter import firdes
from optparse import OptionParser
import pmt
import sys
import tutorial
from gnuradio import qtgui
class top_blockRSM_frew_sweepv1(gr.top_block, Qt.QWidget):
def __init__(self):
gr.top_block.__init__(self, "Top Blockrsm Frew Sweepv1")
Qt.QWidget.__init__(self)
self.setWindowTitle("Top Blockrsm Frew Sweepv1")
qtgui.util.check_set_qss()
try:
self.setWindowIcon(Qt.QIcon.fromTheme('gnuradio-grc'))
except:
pass
self.top_scroll_layout = Qt.QVBoxLayout()
self.setLayout(self.top_scroll_layout)
self.top_scroll = Qt.QScrollArea()
self.top_scroll.setFrameStyle(Qt.QFrame.NoFrame)
self.top_scroll_layout.addWidget(self.top_scroll)
self.top_scroll.setWidgetResizable(True)
self.top_widget = Qt.QWidget()
self.top_scroll.setWidget(self.top_widget)
self.top_layout = Qt.QVBoxLayout(self.top_widget)
self.top_grid_layout = Qt.QGridLayout()
self.top_layout.addLayout(self.top_grid_layout)
self.settings = Qt.QSettings("GNU Radio", "top_blockRSM_frew_sweepv1")
self.restoreGeometry(self.settings.value("geometry").toByteArray())
##################################################
# Variables
##################################################
self.samp_rate = samp_rate = 32000
##################################################
# Blocks
##################################################
self.tutorial_frew_sweep_v1_f_0 = Template error: \
tutorial.frew_sweep_v1_f($initial_freq, $step) cannot find 'initial_freq'
self.blocks_message_strobe_0 = \
blocks.message_strobe(pmt.intern("freq"), 10000) self.blocks_message_debug_0 = \
blocks.message_debug()
##################################################
# Connections
##################################################
self.msg_connect((self.blocks_message_strobe_0, 'strobe'), \
(self.tutorial_frew_sweep_v1_f_0, 'in'))
self.msg_connect((self.tutorial_frew_sweep_v1_f_0, 'out'), \
(self.blocks_message_debug_0, 'print'))
def closeEvent(self, event):
self.settings = Qt.QSettings("GNU Radio", "top_blockRSM_frew_sweepv1")
self.settings.setValue("geometry", self.saveGeometry())
event.accept()
def get_samp_rate(self):
return self.samp_rate
def set_samp_rate(self, samp_rate):
self.samp_rate = samp_rate
def main(top_block_cls=top_blockRSM_frew_sweepv1, options=None):
from distutils.version import StrictVersion
if StrictVersion(Qt.qVersion()) >= StrictVersion("4.5.0"):
style = gr.prefs().get_string('qtgui', 'style', 'raster')
Qt.QApplication.setGraphicsSystem(style)
qapp = Qt.QApplication(sys.argv)
tb = top_block_cls()
tb.start()
tb.show()
def quitting():
tb.stop()
tb.wait()
qapp.connect(qapp, Qt.SIGNAL("aboutToQuit()"), quitting)
qapp.exec_()
if __name__ == '__main__':
main()
in the code, under Blocks, it shows
self.tutorial_frew_sweep_v1_f_0 = Template error: \
tutorial.frew_sweep_v1_f($initial_freq, $step) cannot find 'initial_freq'
So when I Execute the flowgraph, the error pops up.
Executing: /usr/bin/python2 -u /home/pglab1/top_blockRSM_frew_sweepv3.py
File "/home/pglab1/top_blockRSM_frew_sweepv3.py", line 67
self.tutorial_frew_sweep_v1_f_0 = Template error: \
tutorial.frew_sweep_v1_f($initial_freq, $step)
\
^
SyntaxError: invalid syntax
> > > Done (return code 1)
Can someone tell why this error is created in the python code?
Thanking youRensi
[Attachment #5 (text/html)]
<html><head></head><body><div style="font-family:Helvetica Neue, Helvetica, Arial, \
sans-serif;font-size:16px;"><div style="font-family:Helvetica Neue, Helvetica, Arial, \
sans-serif;font-size:16px;"><div><font face="garamond, "new york", times, \
serif"><span><span><span class="ydp13cbfcb5western"><font color="#000000"> I am \
trying to implement this discussion:[Discuss-gnuradio] Change frequency in USRP \
source automatically \
(https://lists.gnu.org/archive/html/discuss-gnuradio/2016-03/msg00402.html). My \
objective is to create a block which changes the frequency automatically in steps of \
2e6, starting from 2.37e9.<br></font></span></span></span></font></div><div><font \
face="garamond, "new york", times, serif"><span><span><span \
class="ydp13cbfcb5western"><font \
color="#000000"><br></font></span></span></span></font></div><div><font \
face="garamond, "new york", times, serif"><span><span><span \
class="ydp13cbfcb5western"><font color="#000000">My block has a code given \
below:</font></span></span></span></font></div><div><div><font face="garamond, \
"new york", times, serif"><span><span><span \
class="ydp13cbfcb5western"><font \
color="#000000"><span><br></span></font></span></span></span></font></div><div><font \
face=""courier new", courier, monaco, monospace, \
sans-serif"><span><span><span class="ydp13cbfcb5western"><font \
color="#000000"><span>import \
string</span></font></span></span></span></font></div><span><span><font \
face=""courier new", courier, monaco, monospace, sans-serif"><span \
class="ydp13cbfcb5western"><font color="#000000"><span><font size="3">import \
numpy<br>import pmt<br>from gnuradio import gr<br>from gnuradio import \
digital<br><br>class frew_sweep_v1_f(gr.sync_block):<br> \
"""<br> docstring for block frew_sweep_v1_f<br> \
"""<br> def __init__(self,initial_freq=2.37e9, \
step=2e6):<br> \
gr.sync_block.__init__(self,<br> \
name="frew_sweep_v1_f",<br> \
in_sig=[],<br> \
out_sig=[])<br><br> \
self.message_port_register_in(pmt.intern('clock'))<br> \
self.message_port_register_out(pmt.intern('sync'))<br> \
self.set_msg_handler(pmt.intern('clock'),self.handler)<br> \
self.freq=initial_freq<br> \
self.step=step<br><br> def \
handler(self,pdu):<br> \
self.message_port_pub(pmt.intern('sync'),pmt.cons(pmt.intern("freq"),pmt.to_pmt(self.f \
req)))<br></font></span></font></span></font></span></span><div><span><span><font \
face=""courier new", courier, monaco, monospace, sans-serif"><span \
class="ydp13cbfcb5western"><font color="#000000"><span><font size="3"> \
self.freq+=self.step</font></span></font></span></font><tt \
class="ydp13cbfcb5western"><font \
color="#000000"><span></span></font></tt></span></span></div><div><span><span><tt \
class="ydp13cbfcb5western"><font \
color="#000000"><span></span></font></tt></span></span><br></div><div><div><font \
face=""times new roman", "new york", times, \
serif"><span><div><font face=""times new roman", "new york", \
times, serif">the xml file has a code given below:</font></div><div><font \
face=""times new roman", "new york", times, \
serif"><br></font></div></span></font></div><font face=""times new roman", \
"new york", times, serif"><span> <font face=""courier new", \
courier, monaco, monospace, sans-serif"><span><?xml \
version="1.0"?><br><block><br> \
<name>frew_sweep_v1_f</name><br> \
<key>tutorial_frew_sweep_v1_f</key><br> \
<category>[tutorial]</category><br> <import>import \
tutorial</import><br> <import>from gnuradio.digital import \
packet_utils</import><br> \
<make>tutorial.frew_sweep_v1_f($initial_freq, $step)</make><br> \
<callback>post_message($msg)</callback><br> \
<param><br> \
<name>message</name><br> \
<key>msg</key><br> \
<type>string</type><br> </param><br> \
<sink><br> <name>in</name><br> \
<type>message</type><br> </sink><br> <br> \
<source><br> \
<name>out</name><br> \
<type>message</type><br> \
</source><br></span></font></span></font><div><font face=""times new \
roman", "new york", times, serif"><font face=""courier new", \
courier, monaco, monospace, \
sans-serif"><span><span></block></span></span></font><br></font></div><div><br><font \
face=""times new roman", "new york", times, \
serif"></font></div></div><div><font face=""times new roman", "new \
york", times, serif">I inserted this new block between a message block and \
message debug block.</font></div><div><font face=""times new roman", \
"new york", times, serif">The new top_block code generated is given \
below:</font></div><div><font face=""times new roman", "new \
york", times, serif"><br></font></div><div><font face=""times new \
roman", "new york", times, serif"><span><br><font face=""courier \
new", courier, monaco, monospace, sans-serif">if __name__ == \
'__main__':<br> import ctypes<br> import \
sys<br> if \
sys.platform.startswith('linux'):<br> \
try:<br> x11 = \
ctypes.cdll.LoadLibrary('libX11.so')<br> \
x11.XInitThreads()<br> \
except:<br> print \
"Warning: failed to XInitThreads()"<br><br>from PyQt4 import Qt<br>from gnuradio \
import digital<br>from gnuradio import blocks<br>from gnuradio import \
eng_notation<br>from gnuradio import gr<br>from gnuradio.digital import \
packet_utils<br>from gnuradio.eng_option import eng_option<br>from gnuradio.filter \
import firdes<br>from optparse import OptionParser<br>import pmt<br>import \
sys<br>import tutorial<br>from gnuradio import qtgui<br><br><br>class \
top_blockRSM_frew_sweepv1(gr.top_block, Qt.QWidget):<br><br> def \
__init__(self):<br> \
gr.top_block.__init__(self, "Top Blockrsm Frew \
Sweepv1")<br> \
Qt.QWidget.__init__(self)<br> \
self.setWindowTitle("Top Blockrsm Frew \
Sweepv1")<br> \
qtgui.util.check_set_qss()<br> \
try:<br> \
self.setWindowIcon(Qt.QIcon.fromTheme('gnuradio-grc'))<br> \
except:<br> \
pass<br> self.top_scroll_layout = \
Qt.QVBoxLayout()<br> \
self.setLayout(self.top_scroll_layout)<br> \
self.top_scroll = Qt.QScrollArea()<br> \
self.top_scroll.setFrameStyle(Qt.QFrame.NoFrame)<br> \
self.top_scroll_layout.addWidget(self.top_scroll)<br> \
self.top_scroll.setWidgetResizable(True)<br> \
self.top_widget = Qt.QWidget()<br> \
self.top_scroll.setWidget(self.top_widget)<br> \
self.top_layout = Qt.QVBoxLayout(self.top_widget)<br> \
self.top_grid_layout = Qt.QGridLayout()<br> \
self.top_layout.addLayout(self.top_grid_layout)<br><br> \
self.settings = Qt.QSettings("GNU Radio", \
"top_blockRSM_frew_sweepv1")<br> \
self.restoreGeometry(self.settings.value("geometry").toByteArray())<br><br> \
##################################################<br> \
# Variables<br> \
##################################################<br> \
self.samp_rate = samp_rate = 32000<br><br> \
##################################################<br> \
# Blocks<br> \
##################################################<br> \
<span style="background-color: rgb(253, 248, 105);">self.tutorial_frew_sweep_v1_f_0 = \
Template error: tutorial.frew_sweep_v1_f($initial_freq, \
$step)</span><br> \
<span style="background-color: rgb(253, 239, 43);">cannot find \
'initial_freq'</span><br> \
self.blocks_message_strobe_0 = blocks.message_strobe(pmt.intern("freq"), \
10000)<br> self.blocks_message_debug_0 = \
blocks.message_debug()<br><br> \
##################################################<br> \
# Connections<br> \
##################################################<br> \
self.msg_connect((self.blocks_message_strobe_0, 'strobe'), \
(self.tutorial_frew_sweep_v1_f_0, \
'in'))<br> \
self.msg_connect((self.tutorial_frew_sweep_v1_f_0, 'out'), \
(self.blocks_message_debug_0, 'print'))<br><br> def \
closeEvent(self, event):<br> self.settings \
= Qt.QSettings("GNU Radio", \
"top_blockRSM_frew_sweepv1")<br> \
self.settings.setValue("geometry", \
self.saveGeometry())<br> \
event.accept()<br><br> def \
get_samp_rate(self):<br> return \
self.samp_rate<br><br> def set_samp_rate(self, \
samp_rate):<br> self.samp_rate = \
samp_rate<br><br><br>def main(top_block_cls=top_blockRSM_frew_sweepv1, \
options=None):<br><br> from distutils.version import \
StrictVersion<br> if StrictVersion(Qt.qVersion()) >= \
StrictVersion("4.5.0"):<br> style = \
gr.prefs().get_string('qtgui', 'style', \
'raster')<br> \
Qt.QApplication.setGraphicsSystem(style)<br> qapp = \
Qt.QApplication(sys.argv)<br><br> tb = \
top_block_cls()<br> tb.start()<br> \
tb.show()<br><br> def \
quitting():<br> \
tb.stop()<br> \
tb.wait()<br> qapp.connect(qapp, Qt.SIGNAL("aboutToQuit()"), \
quitting)<br> qapp.exec_()<br><br><br>if __name__ == \
'__main__':<br> main()</font></span><font face=""courier \
new", courier, monaco, monospace, sans-serif"><br></font></font></div><font \
face=""courier new", courier, monaco, monospace, \
sans-serif"><span><span><span class="ydp13cbfcb5western"><font \
color="#000000"><span><br></span></font></span></span></span></font><div><font \
face=""times new roman", "new york", times, serif">in the code, \
under Blocks, it shows </font><span><font face=""times new roman", \
"new york", times, serif"><span><font face=""courier new", \
courier, monaco, monospace, sans-serif"><span style="background-color: rgb(253, 248, \
105);"><br></span></font></span></font></span></div><div><span><font \
face=""times new roman", "new york", times, serif"><span><font \
face=""courier new", courier, monaco, monospace, sans-serif"><span \
style="background-color: rgb(253, 248, \
105);"><br></span></font></span></font></span></div><div><span><font \
face=""times new roman", "new york", times, serif"><span><font \
face=""courier new", courier, monaco, monospace, sans-serif"><span \
style="background-color: rgb(253, 248, 105);">self.tutorial_frew_sweep_v1_f_0 = \
Template error: tutorial.frew_sweep_v1_f($initial_freq, $step) <span><font \
face=""times new roman", "new york", times, serif"><span><font \
face=""courier new", courier, monaco, monospace, sans-serif"><span \
style="background-color: rgb(253, 239, 43);">cannot find \
'initial_freq'</span></font></span></font></span></span></font></span></font></span></div><div><span><font \
face=""times new roman", "new york", times, serif"><span><font \
face=""courier new", courier, monaco, monospace, sans-serif"><span \
style="background-color: rgb(253, 248, 105);"><span><font face=""times new \
roman", "new york", times, serif"><span><font face=""courier \
new", courier, monaco, monospace, sans-serif"><span style="background-color: \
rgb(253, 239, 43);"><br></span></font></span></font></span></span></font></span></font></span></div><br><span></span><div><font \
face=""times new roman", "new york", times, serif"><font \
face=""courier new", courier, monaco, monospace, \
sans-serif"><span><span><div><font face=""times new roman", "new \
york", times, serif">So when I Execute the flowgraph, the error pops \
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