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//
// Copyright 2010-2011 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
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
//
#include "usrp2_impl.hpp"
#include "usrp2_regs.hpp"
#include <uhd/usrp/dsp_utils.hpp>
#include <uhd/usrp/dsp_props.hpp>
#include <boost/bind.hpp>
#include <boost/math/special_functions/round.hpp>
#include <boost/math/special_functions/sign.hpp>
#include <algorithm>
#include <cmath>
using namespace uhd;
using namespace uhd::usrp;
/***********************************************************************
* DSP impl and methods
**********************************************************************/
struct usrp2_mboard_impl::dsp_impl{
uhd::dict<size_t, size_t> ddc_decim;
uhd::dict<size_t, double> ddc_freq;
uhd::dict<size_t, size_t> duc_interp;
uhd::dict<size_t, double> duc_freq;
std::vector<size_t> decim_and_interp_rates;
uhd::dict<size_t, bool> continuous_streaming;
};
void usrp2_mboard_impl::dsp_init(void){
//create new dsp impl
_dsp_impl = UHD_PIMPL_MAKE(dsp_impl, ());
//load the allowed decim/interp rates
//range(4, 128+1, 1) + range(130, 256+1, 2) + range(260, 512+1, 4)
for (size_t i = 4; i <= 128; i+=1){
_dsp_impl->decim_and_interp_rates.push_back(i);
}
for (size_t i = 130; i <= 256; i+=2){
_dsp_impl->decim_and_interp_rates.push_back(i);
}
for (size_t i = 260; i <= 512; i+=4){
_dsp_impl->decim_and_interp_rates.push_back(i);
}
//bind and initialize the rx dsps
for (size_t i = 0; i < NUM_RX_DSPS; i++){
_rx_dsp_proxies[str(boost::format("DSP%d")%i)] = wax_obj_proxy::make(
boost::bind(&usrp2_mboard_impl::ddc_get, this, _1, _2, i),
boost::bind(&usrp2_mboard_impl::ddc_set, this, _1, _2, i)
);
//initial config and update
ddc_set(DSP_PROP_FREQ_SHIFT, double(0), i);
ddc_set(DSP_PROP_HOST_RATE, double(get_master_clock_freq()/16), i);
//setup the rx control registers
_iface->poke32(U2_REG_RX_CTRL_CLEAR(i), 1); //reset
_iface->poke32(U2_REG_RX_CTRL_NSAMPS_PP(i), _device.get_max_recv_samps_per_packet());
_iface->poke32(U2_REG_RX_CTRL_NCHANNELS(i), 1);
_iface->poke32(U2_REG_RX_CTRL_VRT_HDR(i), 0
| (0x1 << 28) //if data with stream id
| (0x1 << 26) //has trailer
| (0x3 << 22) //integer time other
| (0x1 << 20) //fractional time sample count
);
_iface->poke32(U2_REG_RX_CTRL_VRT_SID(i), usrp2_impl::RECV_SID);
_iface->poke32(U2_REG_RX_CTRL_VRT_TLR(i), 0);
_iface->poke32(U2_REG_TIME64_TPS, size_t(get_master_clock_freq()));
}
//bind and initialize the tx dsps
for (size_t i = 0; i < NUM_TX_DSPS; i++){
_tx_dsp_proxies[str(boost::format("DSP%d")%i)] = wax_obj_proxy::make(
boost::bind(&usrp2_mboard_impl::duc_get, this, _1, _2, i),
boost::bind(&usrp2_mboard_impl::duc_set, this, _1, _2, i)
);
//initial config and update
duc_set(DSP_PROP_FREQ_SHIFT, double(0), i);
duc_set(DSP_PROP_HOST_RATE, double(get_master_clock_freq()/16), i);
//init the tx control registers
_iface->poke32(U2_REG_TX_CTRL_CLEAR_STATE, 1); //reset
_iface->poke32(U2_REG_TX_CTRL_NUM_CHAN, 0); //1 channel
_iface->poke32(U2_REG_TX_CTRL_REPORT_SID, usrp2_impl::ASYNC_SID);
_iface->poke32(U2_REG_TX_CTRL_POLICY, U2_FLAG_TX_CTRL_POLICY_NEXT_PACKET);
}
}
template <typename rate_type>
static rate_type pick_closest_rate(double exact_rate, const std::vector<rate_type> &rates){
unsigned closest_match = rates.front();
BOOST_FOREACH(rate_type possible_rate, rates){
if(std::abs(exact_rate - possible_rate) < std::abs(exact_rate - closest_match))
closest_match = possible_rate;
}
return closest_match;
}
void usrp2_mboard_impl::issue_ddc_stream_cmd(const stream_cmd_t &stream_cmd, size_t which_dsp){
_dsp_impl->continuous_streaming[which_dsp] = stream_cmd.stream_mode == stream_cmd_t::STREAM_MODE_START_CONTINUOUS;
_iface->poke32(U2_REG_RX_CTRL_STREAM_CMD(which_dsp), dsp_type1::calc_stream_cmd_word(stream_cmd));
_iface->poke32(U2_REG_RX_CTRL_TIME_SECS(which_dsp), boost::uint32_t(stream_cmd.time_spec.get_full_secs()));
_iface->poke32(U2_REG_RX_CTRL_TIME_TICKS(which_dsp), stream_cmd.time_spec.get_tick_count(get_master_clock_freq()));
}
/***********************************************************************
* DDC Properties
**********************************************************************/
void usrp2_mboard_impl::ddc_get(const wax::obj &key_, wax::obj &val, size_t which_dsp){
named_prop_t key = named_prop_t::extract(key_);
switch(key.as<dsp_prop_t>()){
case DSP_PROP_NAME:
val = str(boost::format("%s ddc%d") % _iface->get_cname() % which_dsp);
return;
case DSP_PROP_OTHERS:
val = prop_names_t(); //empty
return;
case DSP_PROP_FREQ_SHIFT:
val = _dsp_impl->ddc_freq[which_dsp];
return;
case DSP_PROP_CODEC_RATE:
val = get_master_clock_freq();
return;
case DSP_PROP_HOST_RATE:
val = get_master_clock_freq()/_dsp_impl->ddc_decim[which_dsp];
return;
default: UHD_THROW_PROP_GET_ERROR();
}
}
void usrp2_mboard_impl::ddc_set(const wax::obj &key_, const wax::obj &val, size_t which_dsp){
named_prop_t key = named_prop_t::extract(key_);
switch(key.as<dsp_prop_t>()){
case DSP_PROP_STREAM_CMD:
issue_ddc_stream_cmd(val.as<stream_cmd_t>(), which_dsp);
return;
case DSP_PROP_FREQ_SHIFT:{
double new_freq = val.as<double>();
_iface->poke32(U2_REG_DSP_RX_FREQ(which_dsp),
dsp_type1::calc_cordic_word_and_update(new_freq, get_master_clock_freq())
);
_dsp_impl->ddc_freq[which_dsp] = new_freq; //shadow
}
return;
case DSP_PROP_HOST_RATE:{
double extact_rate = get_master_clock_freq()/val.as<double>();
_dsp_impl->ddc_decim[which_dsp] = pick_closest_rate(extact_rate, _dsp_impl->decim_and_interp_rates);
//set the decimation
_iface->poke32(U2_REG_DSP_RX_DECIM(which_dsp), dsp_type1::calc_cic_filter_word(_dsp_impl->ddc_decim[which_dsp]));
//set the scaling
static const boost::int16_t default_rx_scale_iq = 1024;
_iface->poke32(U2_REG_DSP_RX_SCALE_IQ(which_dsp),
dsp_type1::calc_iq_scale_word(default_rx_scale_iq, default_rx_scale_iq)
);
}
_device.update_xport_channel_mapping(); //rate changed -> update
return;
default: UHD_THROW_PROP_SET_ERROR();
}
}
/***********************************************************************
* DUC Properties
**********************************************************************/
void usrp2_mboard_impl::duc_get(const wax::obj &key_, wax::obj &val, size_t which_dsp){
named_prop_t key = named_prop_t::extract(key_);
switch(key.as<dsp_prop_t>()){
case DSP_PROP_NAME:
val = str(boost::format("%s duc%d") % _iface->get_cname() % which_dsp);
return;
case DSP_PROP_OTHERS:
val = prop_names_t(); //empty
return;
case DSP_PROP_FREQ_SHIFT:
val = _dsp_impl->duc_freq[which_dsp];
return;
case DSP_PROP_CODEC_RATE:
val = get_master_clock_freq();
return;
case DSP_PROP_HOST_RATE:
val = get_master_clock_freq()/_dsp_impl->duc_interp[which_dsp];
return;
default: UHD_THROW_PROP_GET_ERROR();
}
}
void usrp2_mboard_impl::duc_set(const wax::obj &key_, const wax::obj &val, size_t which_dsp){
named_prop_t key = named_prop_t::extract(key_);
switch(key.as<dsp_prop_t>()){
case DSP_PROP_FREQ_SHIFT:{
const double codec_rate = get_master_clock_freq();
double new_freq = val.as<double>();
//calculate the DAC shift (multiples of rate)
const int sign = boost::math::sign(new_freq);
const int zone = std::min(boost::math::iround(new_freq/codec_rate), 2);
const double dac_shift = sign*zone*codec_rate;
new_freq -= dac_shift; //update FPGA DSP target freq
//set the DAC shift (modulation mode)
if (zone == 0) _codec_ctrl->set_tx_mod_mode(0); //no shift
else _codec_ctrl->set_tx_mod_mode(sign*4/zone); //DAC interp = 4
_iface->poke32(U2_REG_DSP_TX_FREQ,
dsp_type1::calc_cordic_word_and_update(new_freq, codec_rate)
);
_dsp_impl->duc_freq[which_dsp] = new_freq + dac_shift; //shadow
}
return;
case DSP_PROP_HOST_RATE:{
double extact_rate = get_master_clock_freq()/val.as<double>();
_dsp_impl->duc_interp[which_dsp] = pick_closest_rate(extact_rate, _dsp_impl->decim_and_interp_rates);
//set the interpolation
_iface->poke32(U2_REG_DSP_TX_INTERP_RATE, dsp_type1::calc_cic_filter_word(_dsp_impl->duc_interp[which_dsp]));
//set the scaling
_iface->poke32(U2_REG_DSP_TX_SCALE_IQ, dsp_type1::calc_iq_scale_word(_dsp_impl->duc_interp[which_dsp]));
}
_device.update_xport_channel_mapping(); //rate changed -> update
return;
default: UHD_THROW_PROP_SET_ERROR();
}
}
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