diff options
Diffstat (limited to 'host/lib/usrp')
| -rw-r--r-- | host/lib/usrp/dboard/db_dbsrx.cpp | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/host/lib/usrp/dboard/db_dbsrx.cpp b/host/lib/usrp/dboard/db_dbsrx.cpp index 846597f06..95c5c5d4d 100644 --- a/host/lib/usrp/dboard/db_dbsrx.cpp +++ b/host/lib/usrp/dboard/db_dbsrx.cpp @@ -1,5 +1,5 @@ // -// Copyright 2010-2011 Ettus Research LLC +// Copyright 2010-2012 Ettus Research LLC // // This program is free software: you can redistribute it and/or modify // it under the terms of the GNU General Public License as published by @@ -58,6 +58,8 @@ static const uhd::dict<std::string, gain_range_t> dbsrx_gain_ranges = map_list_o ("GC2", gain_range_t(0, 24, 1)) ; +static const double usrp1_gpio_clock_rate_limit = 4e6; + /*********************************************************************** * The DBSRX dboard class **********************************************************************/ @@ -265,6 +267,11 @@ double dbsrx::set_lo_freq(double target_freq){ std::vector<double> clock_rates = this->get_iface()->get_clock_rates(dboard_iface::UNIT_RX); const double max_clock_rate = uhd::sorted(clock_rates).back(); BOOST_FOREACH(ref_clock, uhd::reversed(uhd::sorted(clock_rates))){ + //USRP1 feeds the DBSRX clock from a FPGA GPIO line. + //make sure that this clock does not exceed rate limit. + if (this->get_iface()->get_special_props().soft_clock_divider){ + if (ref_clock > usrp1_gpio_clock_rate_limit) continue; + } if (ref_clock > 27.0e6) continue; if (size_t(max_clock_rate/ref_clock)%2 == 1) continue; //reject asymmetric clocks (odd divisors) |