Implements USRP2 peek() command, allowing arbitrary reads from the internal

Wishbone bus.  Minor fix for USRP2 sync_to_pps() (uses correct packet type.)

Example:

>>> from gnuradio import usrp2
>>> u = usrp2.source_32fc()
>>> u.peek(0x1234, 4) # Read four bytes at offset 0x1234 (code)
(185, 244, 253, 164)
>>> 

The return value will be zero length upon error.

The read address must be 32-bit aligned, and only the lower 16 bits are
significant.  The length must be an integral multiple of 4 bytes. There is 
currently a read limit of 176 bytes per read; to change requires some additional 
firmware changes to allocate a larger reply packet.

WARNING: Trying to read from memory locations not serviced by RAM or by a
Wishbone peripheral may result in a hang requiring a USRP2 power cycle.  The
USRP2 internal memory map is documented in usrp2/firmware/lib/memory_map.h.



git-svn-id: http://gnuradio.org/svn/gnuradio/trunk@10172 221aa14e-8319-0410-a670-987f0aec2ac5

1 files changed, 6 insertions, 0 deletions

diff --git a/gr-usrp2/src/usrp2_base.cc b/gr-usrp2/src/usrp2_base.cc
index 8f80a0119..443d1faaa 100644
--- a/gr-usrp2/src/usrp2_base.cc
+++ b/gr-usrp2/src/usrp2_base.cc
@@ -67,6 +67,12 @@ usrp2_base::sync_to_pps()
   return d_u2->sync_to_pps();
 }
 
+std::vector<uint8_t>
+usrp2_base::peek(uint32_t addr, uint32_t len)
+{
+  return d_u2->peek(addr, len);
+}
+
 bool
 usrp2_base::start()
 {