[Discuss-gnuradio] GRC question

[Scott Bierly]

Has anyone successfully used GRC with  USRP Dual Source and/or USRP Dual
Sink blocks?  The attached .grc file and .py file are my simple test case,
which bombs like this:

Generating: "/home/scott/src/gnuradio/scott-grc/Scott_Dual_FFT_RFX900.py"

Executing: "/home/scott/src/gnuradio/scott-grc/Scott_Dual_FFT_RFX900.py"

Traceback (most recent call last):
  File "/home/scott/src/gnuradio/scott-grc/Scott_Dual_FFT_RFX900.py", line
72, in <module>
    tb = Scott_Dual_FFT_RFX900()
  File "/home/scott/src/gnuradio/scott-grc/Scott_Dual_FFT_RFX900.py", line
45, in __init__
    tx_enb_b=True,
  File
"/usr/local/lib/python2.5/site-packages/grc_gnuradio/usrp/simple_usrp.py",
line 360, in __init__
    gr.io_signature(2, 2, constructor_to_size[self.constructor[0]]),
TypeError: 'instancemethod' object is unsubscriptable


I added the Sink to see what would happen, but originally only had the USRP
Dual Source as a simple diagnostic test, and that bombed this way:

Generating: "/home/scott/src/gnuradio/scott-grc/Scott_Dual_FFT_RFX900.py"

Executing: "/home/scott/src/gnuradio/scott-grc/Scott_Dual_FFT_RFX900.py"

Traceback (most recent call last):
  File "/home/scott/src/gnuradio/scott-grc/Scott_Dual_FFT_RFX900.py", line
56, in <module>
    tb = Scott_Dual_FFT_RFX900()
  File "/home/scott/src/gnuradio/scott-grc/Scott_Dual_FFT_RFX900.py", line
43, in __init__
    rx_ant_b="RX2",
  File
"/usr/local/lib/python2.5/site-packages/grc_gnuradio/usrp/simple_usrp.py",
line 320, in __init__
    gr.io_signature(2, 2, constructor_to_size[self.constructor[0]]),
TypeError: 'instancemethod' object is unsubscriptable

>>> Done


I'm having a hard time figuring out from this what I might have done wrong.
I will confess I don't understand how to setup the mux yet, but that does
not appear to be related to this problem.

I'm running off the subversion gnuradio build 10260, which contains GRC
version 3.1SVN.

Thanks for any help.
--Scott

Scott_Dual_FFT_RFX900_test.grc
Description: Binary data

#!/usr/bin/env python
##################################################
# Gnuradio Python Flow Graph
# Title: untitled
# Author: unknown
# Description: gnuradio flow graph
# Generated: Sun Jan 25 00:23:24 2009
##################################################

from gnuradio import gr
from grc_gnuradio import usrp as grc_usrp
from grc_gnuradio import wxgui as grc_wxgui
import wx

class Scott_Dual_FFT_RFX900(grc_wxgui.top_block_gui):

	def __init__(self):
		grc_wxgui.top_block_gui.__init__(
			self,
			title="GRC - Executing: untitled",
		)

		##################################################
		# Variables
		##################################################
		self.samp_rate = samp_rate = 32000

		##################################################
		# Blocks
		##################################################
		self.gr_null_sink_0 = gr.null_sink(gr.sizeof_gr_complex*1)
		self.gr_null_sink_1 = gr.null_sink(gr.sizeof_gr_complex*1)
		self.gr_null_source_0 = gr.null_source(gr.sizeof_gr_complex*1)
		self.gr_null_source_1 = gr.null_source(gr.sizeof_gr_complex*1)
		self.usrp_dual_sink_x_0 = grc_usrp.dual_sink_c(
			number=0,
			frequency_a=900e6,
			frequency_b=900e6,
			interpolation=400,
			gain_a=50,
			gain_b=50,
			mux=0x0,
			auto_tr=False,
			tx_enb_a=True,
			tx_enb_b=True,
		)
		self.usrp_dual_source_x_0 = grc_usrp.dual_source_c(
			number=0,
			frequency_a=900e6,
			frequency_b=900e6,
			decimation=200,
			gain_a=50,
			gain_b=50,
			mux=0x0,
			auto_tr=False,
			rx_ant_a="RX2",
			rx_ant_b="RX2",
		)

		##################################################
		# Connections
		##################################################
		self.connect((self.usrp_dual_source_x_0, 0), (self.gr_null_sink_1, 0))
		self.connect((self.usrp_dual_source_x_0, 1), (self.gr_null_sink_0, 0))
		self.connect((self.gr_null_source_0, 0), (self.usrp_dual_sink_x_0, 0))
		self.connect((self.gr_null_source_1, 0), (self.usrp_dual_sink_x_0, 1))

	def set_samp_rate(self, samp_rate):
		self.samp_rate = samp_rate

if __name__ == '__main__':
	tb = Scott_Dual_FFT_RFX900()
	tb.Run()


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