I haven’t been using my usrp for a little while. I’ve been porting my
code to a TI C64x+. I came back to my usrp today and tried to run just
a basic receive for test data for my TI DSP. I got the following error.
In usbview I see a “USRP Rev4” under my ehci controller. I thought it
might be the board, so I grabbed my other usrp, and the exact same thing
happened. (This is with gnuradio-3.1.1 ) So I tried my older gnuradio
install, and tried to run usrp_fft.py… and the same things happened.
I checked /usr/local/share/usrp. It has all of the rbf (see below).
Has anyone encountered this before? It was just a few months back
everything was great… I didn’t touch gr for a while… came back and
BOOM. 
No joy.
usb_control_msg failed: error sending control message: Protocol error
usb_control_msg failed: error sending control message: Protocol error
usb_control_msg failed: error sending control message: Protocol error
usrp: failed to load fpga bitstream
/usr/local/share/usrp/rev4/std_2rxhb_2tx.rbf.
Traceback (most recent call last):
File “./usrp_wfm_rcv.py”, line 289, in
app = stdgui2.stdapp (wfm_rx_block, “USRP WFM RX”)
File
“/usr/local/lib/python2.5/site-packages/gnuradio/wxgui/stdgui2.py”, line
36, in init
wx.App.init (self, redirect=False)
File
“/usr/lib/python2.5/site-packages/wx-2.6-gtk2-unicode/wx/_core.py”, line
7700, in init
self._BootstrapApp()
File
“/usr/lib/python2.5/site-packages/wx-2.6-gtk2-unicode/wx/_core.py”, line
7352, in _BootstrapApp
return core.PyApp__BootstrapApp(*args, **kwargs)
File
“/usr/local/lib/python2.5/site-packages/gnuradio/wxgui/stdgui2.py”, line
39, in OnInit
frame = stdframe (self.top_block_maker, self.title, self._nstatus)
File
“/usr/local/lib/python2.5/site-packages/gnuradio/wxgui/stdgui2.py”, line
60, in init
self.panel = stdpanel (self, self, top_block_maker)
File
“/usr/local/lib/python2.5/site-packages/gnuradio/wxgui/stdgui2.py”, line
81, in init
self.top_block = top_block_maker (frame, self, vbox, sys.argv)
File “./usrp_wfm_rcv.py”, line 79, in init
self.u = usrp.source_c() # usrp is data source
File “/usr/local/lib/python2.5/site-packages/gnuradio/usrp.py”, line
248, in init
fpga_filename, firmware_filename)
File “/usr/local/lib/python2.5/site-packages/gnuradio/usrp1.py”, line
1232, in source_c
return _usrp1.source_c(*args)
RuntimeError: can’t open usrp1
:/proc$ cd /usr/local/share/usrp/rev4/
total 840k
drwxr-xr-x 2 root root 4.1k 2007-11-12 11:57 ./
drwxr-xr-x 4 root root 4.1k 2007-08-20 20:45 …/
-rw-r–r-- 1 root root 181k 2007-11-12 11:56 multi_2rxhb_2tx.rbf
-rw-r–r-- 1 root root 181k 2007-11-12 11:56 std_2rxhb_2tx.rbf
-rw-r–r-- 1 root root 182k 2007-11-12 11:56 std_4rx_0tx.rbf
-rw-r–r-- 1 root root 18k 2007-11-12 11:56 std.ihx
-rw-r–r-- 1 root root 123k 2007-11-12 11:57 usrp_radar_mono.rbf
-rw-r–r-- 1 root root 114k 2007-11-12 11:57 usrp_sounder.rbf
j0j
No joy.