diff options
Diffstat (limited to 'host/lib/usrp/b200/b200_io_impl.cpp')
| -rw-r--r-- | host/lib/usrp/b200/b200_io_impl.cpp | 156 |
1 files changed, 135 insertions, 21 deletions
diff --git a/host/lib/usrp/b200/b200_io_impl.cpp b/host/lib/usrp/b200/b200_io_impl.cpp index 262c95f0d..60b925517 100644 --- a/host/lib/usrp/b200/b200_io_impl.cpp +++ b/host/lib/usrp/b200/b200_io_impl.cpp @@ -1,5 +1,5 @@ // -// Copyright 2012-2013 Ettus Research LLC +// Copyright 2012-2014 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 @@ -21,8 +21,10 @@ #include "../../transport/super_recv_packet_handler.hpp" #include "../../transport/super_send_packet_handler.hpp" #include "async_packet_handler.hpp" +#include <uhd/utils/math.hpp> #include <boost/bind.hpp> #include <boost/make_shared.hpp> +#include <boost/math/common_factor.hpp> #include <set> using namespace uhd; @@ -34,30 +36,32 @@ using namespace uhd::transport; **********************************************************************/ void b200_impl::check_tick_rate_with_current_streamers(double rate) { - size_t max_tx_chan_count = 0, max_rx_chan_count = 0; + // Defined in b200_impl.cpp + enforce_tick_rate_limits(max_chan_count("RX"), rate, "RX"); + enforce_tick_rate_limits(max_chan_count("TX"), rate, "TX"); +} + +// direction can either be "TX", "RX", or empty (default) +size_t b200_impl::max_chan_count(const std::string &direction /* = "" */) +{ + size_t max_count = 0; BOOST_FOREACH(radio_perifs_t &perif, _radio_perifs) { - { + if ((direction == "RX" or direction.empty()) and not perif.rx_streamer.expired()) { boost::shared_ptr<sph::recv_packet_streamer> rx_streamer = boost::dynamic_pointer_cast<sph::recv_packet_streamer>(perif.rx_streamer.lock()); - if (rx_streamer) - max_rx_chan_count = std::max(max_rx_chan_count, rx_streamer->get_num_channels()); + max_count = std::max(max_count, rx_streamer->get_num_channels()); } - - { + if ((direction == "TX" or direction.empty()) and not perif.tx_streamer.expired()) { boost::shared_ptr<sph::send_packet_streamer> tx_streamer = boost::dynamic_pointer_cast<sph::send_packet_streamer>(perif.tx_streamer.lock()); - if (tx_streamer) - max_tx_chan_count = std::max(max_tx_chan_count, tx_streamer->get_num_channels()); + max_count = std::max(max_count, tx_streamer->get_num_channels()); } } - - // Defined in b200_impl.cpp - enforce_tick_rate_limits(max_rx_chan_count, rate, "RX"); - enforce_tick_rate_limits(max_tx_chan_count, rate, "TX"); + return max_count; } -void b200_impl::check_streamer_args(const uhd::stream_args_t &args, double tick_rate, const char* direction /*= NULL*/) +void b200_impl::check_streamer_args(const uhd::stream_args_t &args, double tick_rate, const std::string &direction /*= ""*/) { std::set<size_t> chans_set; for (size_t stream_i = 0; stream_i < args.channels.size(); stream_i++) @@ -69,26 +73,120 @@ void b200_impl::check_streamer_args(const uhd::stream_args_t &args, double tick_ enforce_tick_rate_limits(chans_set.size(), tick_rate, direction); // Defined in b200_impl.cpp } -void b200_impl::update_tick_rate(const double rate) +void b200_impl::set_auto_tick_rate( + const double rate, + const fs_path &tree_dsp_path, + size_t num_chans +) { + if (num_chans == 0) { // Divine them + num_chans = std::max(size_t(1), max_chan_count()); + } + + // See also the doxygen documentation for these steps in b200_impl.hpp + // Step 1: Obtain LCM and max rate from all relevant dsps + boost::uint32_t lcm_rate = (rate == 0) ? 1 : static_cast<boost::uint32_t>(floor(rate + 0.5)); + for (int i = 0; i < 2; i++) { // Loop through rx and tx + std::string dir = (i == 0) ? "tx" : "rx"; + // We have no way of knowing which DSPs are used, so we check them all. + BOOST_FOREACH(const std::string &dsp_no, _tree->list(str(boost::format("/mboards/0/%s_dsps") % dir))) { + fs_path dsp_path = str(boost::format("/mboards/0/%s_dsps/%s") % dir % dsp_no); + if (dsp_path == tree_dsp_path) { + continue; + } + double this_dsp_rate = _tree->access<double>(dsp_path / "rate/value").get(); + // If this_dsp_rate == B200_DEFAULT_RATE, we assume the user did not actually set + // the sampling rate. If the user *did* set the rate to + // B200_DEFAULT_RATE on all DSPs, then this will still work (see below). + // If the user set one DSP to B200_DEFAULT_RATE and the other to + // a different rate, this also works if the rates are integer multiples + // of one another. Only for certain configurations of B200_DEFAULT_RATE + // and another rate that is not an integer multiple, this will be problematic. + // Since this case is less common than the case where a rate is left unset, + // we don't handle that but rather explain that corner case in the documentation. + if (this_dsp_rate == B200_DEFAULT_RATE) { + continue; + } + lcm_rate = boost::math::lcm<boost::uint32_t>( + lcm_rate, + static_cast<boost::uint32_t>(floor(this_dsp_rate + 0.5)) + ); + } + } + if (lcm_rate == 1) { + lcm_rate = static_cast<boost::uint32_t>(B200_DEFAULT_RATE); + } + + // Step 2: Determine whether if we can use lcm_rate (preferred), + // or have to give up because too large: + const double max_tick_rate = + ((num_chans <= 1) ? ad9361_device_t::AD9361_RECOMMENDED_MAX_CLOCK_RATE : ad9361_device_t::AD9361_MAX_CLOCK_RATE/2); + double base_rate = static_cast<double>(lcm_rate); + if (base_rate > max_tick_rate) { + UHD_MSG(warning) + << "Cannot automatically determine an appropriate tick rate for these sampling rates." << std::endl + << "Consider using different sampling rates, or manually specify a suitable master clock rate." << std::endl; + return; // Let the others handle this + } + + // Step 3: Choose the new rate + // Rules for choosing the tick rate: + // Choose a rate that is a power of 2 larger than the sampling rate, + // but at least 4. Cannot exceed the max tick rate, of course, but must + // be larger than the minimum tick rate. + // An equation that does all that is: + // + // f_auto = r * 2^floor(log2(f_max/r)) + // + // where r is the base rate and f_max is the maximum tick rate. The case + // where floor() yields 1 must be caught. + const double min_tick_rate = _codec_ctrl->get_clock_rate_range().start(); + // We use shifts here instead of 2^x because exp2() is not available in all compilers, + // also this guarantees no rounding issues. The type cast to int32_t serves as floor(): + boost::int32_t multiplier = (1 << boost::int32_t(uhd::math::log2(max_tick_rate / base_rate))); + if (multiplier == 2 and base_rate >= min_tick_rate) { + // Don't bother (see above) + multiplier = 1; + } + double new_rate = base_rate * multiplier; + UHD_ASSERT_THROW(new_rate >= min_tick_rate); + UHD_ASSERT_THROW(new_rate <= max_tick_rate); + + if (_tree->access<double>("/mboards/0/tick_rate").get() != new_rate) { + _tree->access<double>("/mboards/0/tick_rate").set(new_rate); + } +} + +void b200_impl::update_tick_rate(const double new_tick_rate) { - check_tick_rate_with_current_streamers(rate); + check_tick_rate_with_current_streamers(new_tick_rate); BOOST_FOREACH(radio_perifs_t &perif, _radio_perifs) { boost::shared_ptr<sph::recv_packet_streamer> my_streamer = boost::dynamic_pointer_cast<sph::recv_packet_streamer>(perif.rx_streamer.lock()); - if (my_streamer) my_streamer->set_tick_rate(rate); - perif.framer->set_tick_rate(_tick_rate); + if (my_streamer) my_streamer->set_tick_rate(new_tick_rate); + perif.framer->set_tick_rate(new_tick_rate); } BOOST_FOREACH(radio_perifs_t &perif, _radio_perifs) { boost::shared_ptr<sph::send_packet_streamer> my_streamer = boost::dynamic_pointer_cast<sph::send_packet_streamer>(perif.tx_streamer.lock()); - if (my_streamer) my_streamer->set_tick_rate(rate); - perif.deframer->set_tick_rate(_tick_rate); + if (my_streamer) my_streamer->set_tick_rate(new_tick_rate); + perif.deframer->set_tick_rate(new_tick_rate); } } + +double b200_impl::coerce_rx_samp_rate(rx_dsp_core_3000::sptr ddc, size_t dspno, const double rx_rate) +{ + // Have to set tick rate first, or the ddc will change the requested rate based on default tick rate + if (_tree->access<bool>("/mboards/0/auto_tick_rate").get()) { + const std::string dsp_path = (boost::format("/mboards/0/rx_dsps/%s") % dspno).str(); + set_auto_tick_rate(rx_rate, dsp_path); + } + return ddc->set_host_rate(rx_rate); +} + void b200_impl::update_rx_samp_rate(const size_t dspno, const double rate) { boost::shared_ptr<sph::recv_packet_streamer> my_streamer = @@ -99,6 +197,16 @@ void b200_impl::update_rx_samp_rate(const size_t dspno, const double rate) my_streamer->set_scale_factor(adj); } +double b200_impl::coerce_tx_samp_rate(tx_dsp_core_3000::sptr duc, size_t dspno, const double tx_rate) +{ + // Have to set tick rate first, or the duc will change the requested rate based on default tick rate + if (_tree->access<bool>("/mboards/0/auto_tick_rate").get()) { + const std::string dsp_path = (boost::format("/mboards/0/tx_dsps/%s") % dspno).str(); + set_auto_tick_rate(tx_rate, dsp_path); + } + return duc->set_host_rate(tx_rate); +} + void b200_impl::update_tx_samp_rate(const size_t dspno, const double rate) { boost::shared_ptr<sph::send_packet_streamer> my_streamer = @@ -264,6 +372,9 @@ rx_streamer::sptr b200_impl::get_rx_stream(const uhd::stream_args_t &args_) if (args.otw_format.empty()) args.otw_format = "sc16"; args.channels = args.channels.empty()? std::vector<size_t>(1, 0) : args.channels; + if (_tree->access<bool>("/mboards/0/auto_tick_rate").get()) { + set_auto_tick_rate(0, "", args.channels.size()); + } check_streamer_args(args, this->get_tick_rate(), "RX"); boost::shared_ptr<sph::recv_packet_streamer> my_streamer; @@ -371,7 +482,10 @@ tx_streamer::sptr b200_impl::get_tx_stream(const uhd::stream_args_t &args_) if (args.otw_format.empty()) args.otw_format = "sc16"; args.channels = args.channels.empty()? std::vector<size_t>(1, 0) : args.channels; - check_streamer_args(args, this->get_tick_rate(), "TX"); + if (_tree->access<bool>("/mboards/0/auto_tick_rate").get()) { + set_auto_tick_rate(0, "", args.channels.size()); + } + check_streamer_args(args, this->get_tick_rate(), "RX"); boost::shared_ptr<sph::send_packet_streamer> my_streamer; for (size_t stream_i = 0; stream_i < args.channels.size(); stream_i++) |