diff options
Diffstat (limited to 'host/lib/usrp/usrp2/mboard_impl.cpp')
| -rw-r--r-- | host/lib/usrp/usrp2/mboard_impl.cpp | 48 |
1 files changed, 48 insertions, 0 deletions
diff --git a/host/lib/usrp/usrp2/mboard_impl.cpp b/host/lib/usrp/usrp2/mboard_impl.cpp index 9afa6eda7..72d1c9d03 100644 --- a/host/lib/usrp/usrp2/mboard_impl.cpp +++ b/host/lib/usrp/usrp2/mboard_impl.cpp @@ -27,6 +27,10 @@ #include <iostream> #include <boost/date_time/posix_time/posix_time.hpp> +static const double mimo_clock_delay_usrp2_rev4 = 4.18e-9; +static const double mimo_clock_delay_usrp_n2xx = 0; //TODO +static const int mimo_clock_sync_delay_cycles = 134; + using namespace uhd; using namespace uhd::usrp; using namespace boost::posix_time; @@ -122,6 +126,20 @@ usrp2_mboard_impl::usrp2_mboard_impl( init_duc_config(); //initialize the clock configuration + if (device_args.has_key("mimo_mode")){ + if (device_args["mimo_mode"] == "master"){ + _mimo_clocking_mode_is_master = true; + } + else if (device_args["mimo_mode"] == "slave"){ + _mimo_clocking_mode_is_master = false; + } + else throw std::runtime_error( + "mimo_mode must be set to master or slave" + ); + } + else { + _mimo_clocking_mode_is_master = bool(_iface->peek32(_iface->regs.status) & (1 << 8)); + } init_clock_config(); //init the codec before the dboard @@ -196,6 +214,36 @@ void usrp2_mboard_impl::update_clock_config(void){ case usrp2_iface::USRP_NXXX: break; } + + //Handle the serdes clocking based on master/slave mode: + // - Masters always drive the clock over serdes. + // - Slaves always lock to this serdes clock. + // - Slaves lock their time over the serdes. + if (_mimo_clocking_mode_is_master){ + _clock_ctrl->enable_mimo_clock_out(true); + switch(_iface->get_rev()){ + case usrp2_iface::USRP_N200: + case usrp2_iface::USRP_N210: + _clock_ctrl->set_mimo_clock_delay(mimo_clock_delay_usrp_n2xx); + break; + + case usrp2_iface::USRP2_REV4: + _clock_ctrl->set_mimo_clock_delay(mimo_clock_delay_usrp2_rev4); + break; + + default: break; //not handled + } + _iface->poke32(_iface->regs.time64_mimo_sync, 0); + } + else{ + _iface->poke32(_iface->regs.misc_ctrl_clock, 0x15); + _clock_ctrl->enable_external_ref(true); + _clock_ctrl->enable_mimo_clock_out(false); + _iface->poke32(_iface->regs.time64_mimo_sync, + (1 << 8) | (mimo_clock_sync_delay_cycles & 0xff) + ); + } + } void usrp2_mboard_impl::set_time_spec(const time_spec_t &time_spec, bool now){ |