diff options
Diffstat (limited to 'host/lib/usrp/dboard/db_xcvr2450.cpp')
| -rw-r--r-- | host/lib/usrp/dboard/db_xcvr2450.cpp | 673 |
1 files changed, 673 insertions, 0 deletions
diff --git a/host/lib/usrp/dboard/db_xcvr2450.cpp b/host/lib/usrp/dboard/db_xcvr2450.cpp new file mode 100644 index 000000000..da894fc9b --- /dev/null +++ b/host/lib/usrp/dboard/db_xcvr2450.cpp @@ -0,0 +1,673 @@ +// +// 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 +// 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/>. +// + +// TX IO Pins +#define HB_PA_OFF_TXIO (1 << 15) // 5GHz PA, 1 = off, 0 = on +#define LB_PA_OFF_TXIO (1 << 14) // 2.4GHz PA, 1 = off, 0 = on +#define ANTSEL_TX1_RX2_TXIO (1 << 13) // 1 = Ant 1 to TX, Ant 2 to RX +#define ANTSEL_TX2_RX1_TXIO (1 << 12) // 1 = Ant 2 to TX, Ant 1 to RX +#define TX_EN_TXIO (1 << 11) // 1 = TX on, 0 = TX off +#define AD9515DIV_TXIO (1 << 4) // 1 = Div by 3, 0 = Div by 2 + +#define TXIO_MASK (HB_PA_OFF_TXIO | LB_PA_OFF_TXIO | ANTSEL_TX1_RX2_TXIO | ANTSEL_TX2_RX1_TXIO | TX_EN_TXIO | AD9515DIV_TXIO) + +// TX IO Functions +#define HB_PA_TXIO LB_PA_OFF_TXIO +#define LB_PA_TXIO HB_PA_OFF_TXIO +#define TX_ENB_TXIO TX_EN_TXIO +#define TX_DIS_TXIO 0 +#define AD9515DIV_3_TXIO AD9515DIV_TXIO +#define AD9515DIV_2_TXIO 0 + +// RX IO Pins +#define LOCKDET_RXIO (1 << 15) // This is an INPUT!!! +#define POWER_RXIO (1 << 14) // 1 = power on, 0 = shutdown +#define RX_EN_RXIO (1 << 13) // 1 = RX on, 0 = RX off +#define RX_HP_RXIO (1 << 12) // 0 = Fc set by rx_hpf, 1 = 600 KHz + +#define RXIO_MASK (POWER_RXIO | RX_EN_RXIO | RX_HP_RXIO) + +// RX IO Functions +#define POWER_UP_RXIO POWER_RXIO +#define POWER_DOWN_RXIO 0 +#define RX_ENB_RXIO RX_EN_RXIO +#define RX_DIS_RXIO 0 + +#include "max2829_regs.hpp" +#include <uhd/utils/log.hpp> +#include <uhd/utils/static.hpp> +#include <uhd/utils/safe_call.hpp> +#include <uhd/utils/assert_has.hpp> +#include <uhd/utils/algorithm.hpp> +#include <uhd/types/ranges.hpp> +#include <uhd/types/sensors.hpp> +#include <uhd/types/dict.hpp> +#include <uhd/usrp/dboard_base.hpp> +#include <uhd/usrp/dboard_manager.hpp> +#include <boost/assign/list_of.hpp> +#include <boost/format.hpp> +#include <boost/thread.hpp> +#include <boost/math/special_functions/round.hpp> +#include <utility> + +using namespace uhd; +using namespace uhd::usrp; +using namespace boost::assign; + +/*********************************************************************** + * The XCVR 2450 constants + **********************************************************************/ +static const freq_range_t xcvr_freq_range = list_of + (range_t(2.4e9, 2.5e9)) + (range_t(4.9e9, 6.0e9)) +; + +//Multiplied by 2.0 for conversion to complex bandpass from lowpass +static const freq_range_t xcvr_tx_bandwidth_range = list_of + (range_t(2.0*12e6)) + (range_t(2.0*18e6)) + (range_t(2.0*24e6)) +; + +//Multiplied by 2.0 for conversion to complex bandpass from lowpass +static const freq_range_t xcvr_rx_bandwidth_range = list_of + (range_t(2.0*0.9*7.5e6, 2.0*1.1*7.5e6)) + (range_t(2.0*0.9*9.5e6, 2.0*1.1*9.5e6)) + (range_t(2.0*0.9*14e6, 2.0*1.1*14e6)) + (range_t(2.0*0.9*18e6, 2.0*1.1*18e6)) +; + +static const std::vector<std::string> xcvr_antennas = list_of("J1")("J2"); + +static const uhd::dict<std::string, gain_range_t> xcvr_tx_gain_ranges = map_list_of + ("VGA", gain_range_t(0, 30, 0.5)) + ("BB", gain_range_t(0, 5, 1.5)) +; +static const uhd::dict<std::string, gain_range_t> xcvr_rx_gain_ranges = map_list_of + ("LNA", gain_range_t(list_of + (range_t(0)) + (range_t(15)) + (range_t(30.5)) + )) + ("VGA", gain_range_t(0, 62, 2.0)) +; + +/*********************************************************************** + * The XCVR 2450 dboard class + **********************************************************************/ +class xcvr2450 : public xcvr_dboard_base{ +public: + xcvr2450(ctor_args_t args); + ~xcvr2450(void); + +private: + double _lo_freq; + double _rx_bandwidth, _tx_bandwidth; + uhd::dict<std::string, double> _tx_gains, _rx_gains; + std::string _tx_ant, _rx_ant; + int _ad9515div; + max2829_regs_t _max2829_regs; + + double set_lo_freq(double target_freq); + double set_lo_freq_core(double target_freq); + void set_tx_ant(const std::string &ant); + void set_rx_ant(const std::string &ant); + double set_tx_gain(double gain, const std::string &name); + double set_rx_gain(double gain, const std::string &name); + double set_rx_bandwidth(double bandwidth); + double set_tx_bandwidth(double bandwidth); + + void update_atr(void); + void spi_reset(void); + void send_reg(boost::uint8_t addr){ + boost::uint32_t value = _max2829_regs.get_reg(addr); + UHD_LOGV(often) << boost::format( + "XCVR2450: send reg 0x%02x, value 0x%05x" + ) % int(addr) % value << std::endl; + this->get_iface()->write_spi( + dboard_iface::UNIT_RX, + spi_config_t::EDGE_RISE, + value, 24 + ); + } + + static bool is_highband(double freq){return freq > 3e9;} + + /*! + * Get the lock detect status of the LO. + * \return sensor for locked + */ + sensor_value_t get_locked(void){ + const bool locked = (this->get_iface()->read_gpio(dboard_iface::UNIT_RX) & LOCKDET_RXIO) != 0; + return sensor_value_t("LO", locked, "locked", "unlocked"); + } + + /*! + * Read the RSSI from the aux adc + * \return the rssi sensor in dBm + */ + sensor_value_t get_rssi(void){ + //*FIXME* RSSI depends on LNA Gain Setting (datasheet pg 16 top middle chart) + double max_power = 0.0; + switch(_max2829_regs.rx_lna_gain){ + case 0: + case 1: max_power = 0; break; + case 2: max_power = -15; break; + case 3: max_power = -30.5; break; + } + + //constants for the rssi calculation + static const double min_v = 2.5, max_v = 0.5; + static const double rssi_dyn_range = 60.0; + //calculate the rssi from the voltage + double voltage = this->get_iface()->read_aux_adc(dboard_iface::UNIT_RX, dboard_iface::AUX_ADC_B); + double rssi = max_power - rssi_dyn_range*(voltage - min_v)/(max_v - min_v); + return sensor_value_t("RSSI", rssi, "dBm"); + } +}; + +/*********************************************************************** + * Register the XCVR 2450 dboard + **********************************************************************/ +static dboard_base::sptr make_xcvr2450(dboard_base::ctor_args_t args){ + return dboard_base::sptr(new xcvr2450(args)); +} + +UHD_STATIC_BLOCK(reg_xcvr2450_dboard){ + //register the factory function for the rx and tx dbids + dboard_manager::register_dboard(0x0061, 0x0060, &make_xcvr2450, "XCVR2450"); +} + +/*********************************************************************** + * Structors + **********************************************************************/ +xcvr2450::xcvr2450(ctor_args_t args) : xcvr_dboard_base(args){ + spi_reset(); //prepare the spi + + _rx_bandwidth = 9.5e6; + _tx_bandwidth = 12.0e6; + + //setup the misc max2829 registers + _max2829_regs.mimo_select = max2829_regs_t::MIMO_SELECT_MIMO; + _max2829_regs.band_sel_mimo = max2829_regs_t::BAND_SEL_MIMO_MIMO; + _max2829_regs.pll_cp_select = max2829_regs_t::PLL_CP_SELECT_4MA; + _max2829_regs.rssi_high_bw = max2829_regs_t::RSSI_HIGH_BW_6MHZ; + _max2829_regs.tx_lpf_coarse_adj = max2829_regs_t::TX_LPF_COARSE_ADJ_12MHZ; + _max2829_regs.rx_lpf_coarse_adj = max2829_regs_t::RX_LPF_COARSE_ADJ_9_5MHZ; + _max2829_regs.rx_lpf_fine_adj = max2829_regs_t::RX_LPF_FINE_ADJ_100; + _max2829_regs.rx_vga_gain_spi = max2829_regs_t::RX_VGA_GAIN_SPI_SPI; + _max2829_regs.rssi_output_range = max2829_regs_t::RSSI_OUTPUT_RANGE_HIGH; + _max2829_regs.rssi_op_mode = max2829_regs_t::RSSI_OP_MODE_ENABLED; + _max2829_regs.rssi_pin_fcn = max2829_regs_t::RSSI_PIN_FCN_RSSI; + _max2829_regs.rx_highpass = max2829_regs_t::RX_HIGHPASS_100HZ; + _max2829_regs.tx_vga_gain_spi = max2829_regs_t::TX_VGA_GAIN_SPI_SPI; + _max2829_regs.pa_driver_linearity = max2829_regs_t::PA_DRIVER_LINEARITY_78; + _max2829_regs.tx_vga_linearity = max2829_regs_t::TX_VGA_LINEARITY_78; + _max2829_regs.tx_upconv_linearity = max2829_regs_t::TX_UPCONV_LINEARITY_78; + + //send initial register settings + for(boost::uint8_t reg = 0x2; reg <= 0xC; reg++){ + this->send_reg(reg); + } + + //////////////////////////////////////////////////////////////////// + // Register RX properties + //////////////////////////////////////////////////////////////////// + this->get_rx_subtree()->create<std::string>("name") + .set("XCVR2450 RX"); + this->get_rx_subtree()->create<sensor_value_t>("sensors/lo_locked") + .publish(boost::bind(&xcvr2450::get_locked, this)); + this->get_rx_subtree()->create<sensor_value_t>("sensors/rssi") + .publish(boost::bind(&xcvr2450::get_rssi, this)); + BOOST_FOREACH(const std::string &name, xcvr_rx_gain_ranges.keys()){ + this->get_rx_subtree()->create<double>("gains/"+name+"/value") + .coerce(boost::bind(&xcvr2450::set_rx_gain, this, _1, name)) + .set(xcvr_rx_gain_ranges[name].start()); + this->get_rx_subtree()->create<meta_range_t>("gains/"+name+"/range") + .set(xcvr_rx_gain_ranges[name]); + } + this->get_rx_subtree()->create<double>("freq/value") + .coerce(boost::bind(&xcvr2450::set_lo_freq, this, _1)) + .set(double(2.45e9)); + this->get_rx_subtree()->create<meta_range_t>("freq/range") + .set(xcvr_freq_range); + this->get_rx_subtree()->create<std::string>("antenna/value") + .subscribe(boost::bind(&xcvr2450::set_rx_ant, this, _1)) + .set(xcvr_antennas.at(0)); + this->get_rx_subtree()->create<std::vector<std::string> >("antenna/options") + .set(xcvr_antennas); + this->get_rx_subtree()->create<std::string>("connection") + .set("IQ"); + this->get_rx_subtree()->create<bool>("enabled") + .set(true); //always enabled + this->get_rx_subtree()->create<bool>("use_lo_offset") + .set(false); + this->get_rx_subtree()->create<double>("bandwidth/value") + .coerce(boost::bind(&xcvr2450::set_rx_bandwidth, this, _1)) //complex bandpass bandwidth + .set(2.0*_rx_bandwidth); //_rx_bandwidth in lowpass, convert to complex bandpass + this->get_rx_subtree()->create<meta_range_t>("bandwidth/range") + .set(xcvr_rx_bandwidth_range); + + //////////////////////////////////////////////////////////////////// + // Register TX properties + //////////////////////////////////////////////////////////////////// + this->get_tx_subtree()->create<std::string>("name") + .set("XCVR2450 TX"); + this->get_tx_subtree()->create<sensor_value_t>("sensors/lo_locked") + .publish(boost::bind(&xcvr2450::get_locked, this)); + BOOST_FOREACH(const std::string &name, xcvr_tx_gain_ranges.keys()){ + this->get_tx_subtree()->create<double>("gains/"+name+"/value") + .coerce(boost::bind(&xcvr2450::set_tx_gain, this, _1, name)) + .set(xcvr_tx_gain_ranges[name].start()); + this->get_tx_subtree()->create<meta_range_t>("gains/"+name+"/range") + .set(xcvr_tx_gain_ranges[name]); + } + this->get_tx_subtree()->create<double>("freq/value") + .coerce(boost::bind(&xcvr2450::set_lo_freq, this, _1)) + .set(double(2.45e9)); + this->get_tx_subtree()->create<meta_range_t>("freq/range") + .set(xcvr_freq_range); + this->get_tx_subtree()->create<std::string>("antenna/value") + .subscribe(boost::bind(&xcvr2450::set_tx_ant, this, _1)) + .set(xcvr_antennas.at(1)); + this->get_tx_subtree()->create<std::vector<std::string> >("antenna/options") + .set(xcvr_antennas); + this->get_tx_subtree()->create<std::string>("connection") + .set("QI"); + this->get_tx_subtree()->create<bool>("enabled") + .set(true); //always enabled + this->get_tx_subtree()->create<bool>("use_lo_offset") + .set(false); + this->get_tx_subtree()->create<double>("bandwidth/value") + .coerce(boost::bind(&xcvr2450::set_tx_bandwidth, this, _1)) //complex bandpass bandwidth + .set(2.0*_tx_bandwidth); //_tx_bandwidth in lowpass, convert to complex bandpass + this->get_tx_subtree()->create<meta_range_t>("bandwidth/range") + .set(xcvr_tx_bandwidth_range); + + //enable only the clocks we need + this->get_iface()->set_clock_enabled(dboard_iface::UNIT_TX, true); + + //set the gpio directions and atr controls (identically) + this->get_iface()->set_pin_ctrl(dboard_iface::UNIT_TX, TXIO_MASK); + this->get_iface()->set_pin_ctrl(dboard_iface::UNIT_RX, RXIO_MASK); + this->get_iface()->set_gpio_ddr(dboard_iface::UNIT_TX, TXIO_MASK); + this->get_iface()->set_gpio_ddr(dboard_iface::UNIT_RX, RXIO_MASK); +} + +xcvr2450::~xcvr2450(void){ + UHD_SAFE_CALL(spi_reset();) +} + +void xcvr2450::spi_reset(void){ + //spi reset mode: global enable = off, tx and rx enable = on + this->get_iface()->set_atr_reg(dboard_iface::UNIT_TX, dboard_iface::ATR_REG_IDLE, TX_ENB_TXIO); + this->get_iface()->set_atr_reg(dboard_iface::UNIT_RX, dboard_iface::ATR_REG_IDLE, RX_ENB_RXIO | POWER_DOWN_RXIO); + boost::this_thread::sleep(boost::posix_time::milliseconds(10)); + + //take it back out of spi reset mode and wait a bit + this->get_iface()->set_atr_reg(dboard_iface::UNIT_RX, dboard_iface::ATR_REG_IDLE, RX_DIS_RXIO | POWER_UP_RXIO); + boost::this_thread::sleep(boost::posix_time::milliseconds(10)); +} + +/*********************************************************************** + * Update ATR regs which change with Antenna or Freq + **********************************************************************/ +void xcvr2450::update_atr(void){ + //calculate tx atr pins + int band_sel = (xcvr2450::is_highband(_lo_freq))? HB_PA_TXIO : LB_PA_TXIO; + int tx_ant_sel = (_tx_ant == "J1")? ANTSEL_TX1_RX2_TXIO : ANTSEL_TX2_RX1_TXIO; + int rx_ant_sel = (_rx_ant == "J2")? ANTSEL_TX1_RX2_TXIO : ANTSEL_TX2_RX1_TXIO; + int xx_ant_sel = tx_ant_sel; //Prefer the tx antenna selection for full duplex, + //due to the issue that USRP1 will take the value of full duplex for its TXATR. + int ad9515div = (_ad9515div == 3)? AD9515DIV_3_TXIO : AD9515DIV_2_TXIO; + + //set the tx registers + this->get_iface()->set_atr_reg(dboard_iface::UNIT_TX, dboard_iface::ATR_REG_IDLE, band_sel | ad9515div | TX_DIS_TXIO); + this->get_iface()->set_atr_reg(dboard_iface::UNIT_TX, dboard_iface::ATR_REG_RX_ONLY, band_sel | ad9515div | TX_DIS_TXIO | rx_ant_sel); + this->get_iface()->set_atr_reg(dboard_iface::UNIT_TX, dboard_iface::ATR_REG_TX_ONLY, band_sel | ad9515div | TX_ENB_TXIO | tx_ant_sel); + this->get_iface()->set_atr_reg(dboard_iface::UNIT_TX, dboard_iface::ATR_REG_FULL_DUPLEX, band_sel | ad9515div | TX_ENB_TXIO | xx_ant_sel); + + //set the rx registers + this->get_iface()->set_atr_reg(dboard_iface::UNIT_RX, dboard_iface::ATR_REG_IDLE, POWER_UP_RXIO | RX_DIS_RXIO); + this->get_iface()->set_atr_reg(dboard_iface::UNIT_RX, dboard_iface::ATR_REG_RX_ONLY, POWER_UP_RXIO | RX_ENB_RXIO); + this->get_iface()->set_atr_reg(dboard_iface::UNIT_RX, dboard_iface::ATR_REG_TX_ONLY, POWER_UP_RXIO | RX_DIS_RXIO); + this->get_iface()->set_atr_reg(dboard_iface::UNIT_RX, dboard_iface::ATR_REG_FULL_DUPLEX, POWER_UP_RXIO | RX_DIS_RXIO); +} + +/*********************************************************************** + * Tuning + **********************************************************************/ +double xcvr2450::set_lo_freq(double target_freq){ + //tune the LO and sleep a bit for lock + //if not locked, try some carrier offsets + double actual = 0.0; + for (double offset = 0.0; offset <= 3e6; offset+=1e6){ + actual = this->set_lo_freq_core(target_freq + offset); + boost::this_thread::sleep(boost::posix_time::milliseconds(50)); + if (this->get_locked().to_bool()) break; + } + return actual; +} + +double xcvr2450::set_lo_freq_core(double target_freq){ + + //clip the input to the range + target_freq = xcvr_freq_range.clip(target_freq); + + //variables used in the calculation below + double scaler = xcvr2450::is_highband(target_freq)? (4.0/5.0) : (4.0/3.0); + double ref_freq = this->get_iface()->get_clock_rate(dboard_iface::UNIT_TX); + int R, intdiv, fracdiv; + + //loop through values until we get a match + for(_ad9515div = 2; _ad9515div <= 3; _ad9515div++){ + for(R = 1; R <= 7; R++){ + double N = (target_freq*scaler*R*_ad9515div)/ref_freq; + intdiv = int(std::floor(N)); + fracdiv = boost::math::iround((N - intdiv)*double(1 << 16)); + //actual minimum is 128, but most chips seems to require higher to lock + if (intdiv < 131 or intdiv > 255) continue; + //constraints met: exit loop + goto done_loop; + } + } done_loop: + + //calculate the actual freq from the values above + double N = double(intdiv) + double(fracdiv)/double(1 << 16); + _lo_freq = (N*ref_freq)/(scaler*R*_ad9515div); + + UHD_LOGV(often) + << boost::format("XCVR2450 tune:\n") + << boost::format(" R=%d, N=%f, ad9515=%d, scaler=%f\n") % R % N % _ad9515div % scaler + << boost::format(" Ref Freq=%fMHz\n") % (ref_freq/1e6) + << boost::format(" Target Freq=%fMHz\n") % (target_freq/1e6) + << boost::format(" Actual Freq=%fMHz\n") % (_lo_freq/1e6) + << std::endl; + + //high-high band or low-high band? + if(_lo_freq > (5.35e9 + 5.47e9)/2.0){ + UHD_LOGV(often) << "XCVR2450 tune: Using high-high band" << std::endl; + _max2829_regs.band_select_802_11a = max2829_regs_t::BAND_SELECT_802_11A_5_47GHZ_TO_5_875GHZ; + }else{ + UHD_LOGV(often) << "XCVR2450 tune: Using low-high band" << std::endl; + _max2829_regs.band_select_802_11a = max2829_regs_t::BAND_SELECT_802_11A_4_9GHZ_TO_5_35GHZ; + } + + //new band select settings and ad9515 divider + this->update_atr(); + + //load new counters into registers + _max2829_regs.int_div_ratio_word = intdiv; + _max2829_regs.frac_div_ratio_lsb = fracdiv & 0x3; + _max2829_regs.frac_div_ratio_msb = fracdiv >> 2; + this->send_reg(0x3); //integer + this->send_reg(0x4); //fractional + + //load the reference divider and band select into registers + //toggle the bandswitch from off to automatic (which really means start) + _max2829_regs.ref_divider = R; + _max2829_regs.band_select = (xcvr2450::is_highband(_lo_freq))? + max2829_regs_t::BAND_SELECT_5GHZ : + max2829_regs_t::BAND_SELECT_2_4GHZ ; + _max2829_regs.vco_bandswitch = max2829_regs_t::VCO_BANDSWITCH_DISABLE; + this->send_reg(0x5); + _max2829_regs.vco_bandswitch = max2829_regs_t::VCO_BANDSWITCH_AUTOMATIC;; + this->send_reg(0x5); + + return _lo_freq; +} + +/*********************************************************************** + * Antenna Handling + **********************************************************************/ +void xcvr2450::set_tx_ant(const std::string &ant){ + assert_has(xcvr_antennas, ant, "xcvr antenna name"); + _tx_ant = ant; + this->update_atr(); //sets the atr to the new antenna setting +} + +void xcvr2450::set_rx_ant(const std::string &ant){ + assert_has(xcvr_antennas, ant, "xcvr antenna name"); + _rx_ant = ant; + this->update_atr(); //sets the atr to the new antenna setting +} + +/*********************************************************************** + * Gain Handling + **********************************************************************/ +/*! + * Convert a requested gain for the tx vga into the integer register value. + * The gain passed into the function will be set to the actual value. + * \param gain the requested gain in dB + * \return 6 bit the register value + */ +static int gain_to_tx_vga_reg(double &gain){ + //calculate the register value + int reg = uhd::clip(boost::math::iround(gain*60/30.0) + 3, 0, 63); + + //calculate the actual gain value + if (reg < 4) gain = 0; + else if (reg < 48) gain = double(reg/2 - 1); + else gain = double(reg/2.0 - 1.5); + + //return register value + return reg; +} + +/*! + * Convert a requested gain for the tx bb into the integer register value. + * The gain passed into the function will be set to the actual value. + * \param gain the requested gain in dB + * \return gain enum value + */ +static max2829_regs_t::tx_baseband_gain_t gain_to_tx_bb_reg(double &gain){ + int reg = uhd::clip(boost::math::iround(gain*3/5.0), 0, 3); + switch(reg){ + case 0: + gain = 0; + return max2829_regs_t::TX_BASEBAND_GAIN_0DB; + case 1: + gain = 2; + return max2829_regs_t::TX_BASEBAND_GAIN_2DB; + case 2: + gain = 3.5; + return max2829_regs_t::TX_BASEBAND_GAIN_3_5DB; + case 3: + gain = 5; + return max2829_regs_t::TX_BASEBAND_GAIN_5DB; + } + UHD_THROW_INVALID_CODE_PATH(); +} + +/*! + * Convert a requested gain for the rx vga into the integer register value. + * The gain passed into the function will be set to the actual value. + * \param gain the requested gain in dB + * \return 5 bit the register value + */ +static int gain_to_rx_vga_reg(double &gain){ + int reg = uhd::clip(boost::math::iround(gain/2.0), 0, 31); + gain = double(reg*2); + return reg; +} + +/*! + * Convert a requested gain for the rx lna into the integer register value. + * The gain passed into the function will be set to the actual value. + * \param gain the requested gain in dB + * \return 2 bit the register value + */ +static int gain_to_rx_lna_reg(double &gain){ + int reg = uhd::clip(boost::math::iround(gain*2/30.5) + 1, 0, 3); + switch(reg){ + case 0: + case 1: gain = 0; break; + case 2: gain = 15; break; + case 3: gain = 30.5; break; + } + return reg; +} + +double xcvr2450::set_tx_gain(double gain, const std::string &name){ + assert_has(xcvr_tx_gain_ranges.keys(), name, "xcvr tx gain name"); + if (name == "VGA"){ + _max2829_regs.tx_vga_gain = gain_to_tx_vga_reg(gain); + send_reg(0xC); + } + else if(name == "BB"){ + _max2829_regs.tx_baseband_gain = gain_to_tx_bb_reg(gain); + send_reg(0x9); + } + else UHD_THROW_INVALID_CODE_PATH(); + _tx_gains[name] = gain; + + return gain; +} + +double xcvr2450::set_rx_gain(double gain, const std::string &name){ + assert_has(xcvr_rx_gain_ranges.keys(), name, "xcvr rx gain name"); + if (name == "VGA"){ + _max2829_regs.rx_vga_gain = gain_to_rx_vga_reg(gain); + send_reg(0xB); + } + else if(name == "LNA"){ + _max2829_regs.rx_lna_gain = gain_to_rx_lna_reg(gain); + send_reg(0xB); + } + else UHD_THROW_INVALID_CODE_PATH(); + _rx_gains[name] = gain; + + return gain; +} + + +/*********************************************************************** + * Bandwidth Handling + **********************************************************************/ +static max2829_regs_t::tx_lpf_coarse_adj_t bandwidth_to_tx_lpf_coarse_reg(double &bandwidth){ + int reg = uhd::clip(boost::math::iround((bandwidth-6.0e6)/6.0e6), 1, 3); + + switch(reg){ + case 1: // bandwidth < 15MHz + bandwidth = 12e6; + return max2829_regs_t::TX_LPF_COARSE_ADJ_12MHZ; + case 2: // 15MHz < bandwidth < 21MHz + bandwidth = 18e6; + return max2829_regs_t::TX_LPF_COARSE_ADJ_18MHZ; + case 3: // bandwidth > 21MHz + bandwidth = 24e6; + return max2829_regs_t::TX_LPF_COARSE_ADJ_24MHZ; + } + UHD_THROW_INVALID_CODE_PATH(); +} + +static max2829_regs_t::rx_lpf_fine_adj_t bandwidth_to_rx_lpf_fine_reg(double &bandwidth, double requested_bandwidth){ + int reg = uhd::clip(boost::math::iround((requested_bandwidth/bandwidth)/0.05), 18, 22); + + switch(reg){ + case 18: // requested_bandwidth < 92.5% + bandwidth = 0.9 * bandwidth; + return max2829_regs_t::RX_LPF_FINE_ADJ_90; + case 19: // 92.5% < requested_bandwidth < 97.5% + bandwidth = 0.95 * bandwidth; + return max2829_regs_t::RX_LPF_FINE_ADJ_95; + case 20: // 97.5% < requested_bandwidth < 102.5% + bandwidth = 1.0 * bandwidth; + return max2829_regs_t::RX_LPF_FINE_ADJ_100; + case 21: // 102.5% < requested_bandwidth < 107.5% + bandwidth = 1.05 * bandwidth; + return max2829_regs_t::RX_LPF_FINE_ADJ_105; + case 22: // 107.5% < requested_bandwidth + bandwidth = 1.1 * bandwidth; + return max2829_regs_t::RX_LPF_FINE_ADJ_110; + } + UHD_THROW_INVALID_CODE_PATH(); +} + +static max2829_regs_t::rx_lpf_coarse_adj_t bandwidth_to_rx_lpf_coarse_reg(double &bandwidth){ + int reg = uhd::clip(boost::math::iround((bandwidth-7.0e6)/1.0e6), 0, 11); + + switch(reg){ + case 0: // bandwidth < 7.5MHz + case 1: // 7.5MHz < bandwidth < 8.5MHz + bandwidth = 7.5e6; + return max2829_regs_t::RX_LPF_COARSE_ADJ_7_5MHZ; + case 2: // 8.5MHz < bandwidth < 9.5MHz + case 3: // 9.5MHz < bandwidth < 10.5MHz + case 4: // 10.5MHz < bandwidth < 11.5MHz + bandwidth = 9.5e6; + return max2829_regs_t::RX_LPF_COARSE_ADJ_9_5MHZ; + case 5: // 11.5MHz < bandwidth < 12.5MHz + case 6: // 12.5MHz < bandwidth < 13.5MHz + case 7: // 13.5MHz < bandwidth < 14.5MHz + case 8: // 14.5MHz < bandwidth < 15.5MHz + bandwidth = 14e6; + return max2829_regs_t::RX_LPF_COARSE_ADJ_14MHZ; + case 9: // 15.5MHz < bandwidth < 16.5MHz + case 10: // 16.5MHz < bandwidth < 17.5MHz + case 11: // 17.5MHz < bandwidth + bandwidth = 18e6; + return max2829_regs_t::RX_LPF_COARSE_ADJ_18MHZ; + } + UHD_THROW_INVALID_CODE_PATH(); +} + +double xcvr2450::set_rx_bandwidth(double bandwidth){ + double requested_bandwidth = bandwidth; + + //convert complex bandpass to lowpass bandwidth + bandwidth = bandwidth/2.0; + + //compute coarse low pass cutoff frequency setting + _max2829_regs.rx_lpf_coarse_adj = bandwidth_to_rx_lpf_coarse_reg(bandwidth); + + //compute fine low pass cutoff frequency setting + _max2829_regs.rx_lpf_fine_adj = bandwidth_to_rx_lpf_fine_reg(bandwidth, requested_bandwidth); + + //shadow bandwidth setting + _rx_bandwidth = bandwidth; + + //update register + send_reg(0x7); + + UHD_LOGV(often) << boost::format( + "XCVR2450 RX Bandwidth (lp_fc): %f Hz, coarse reg: %d, fine reg: %d" + ) % _rx_bandwidth % (int(_max2829_regs.rx_lpf_coarse_adj)) % (int(_max2829_regs.rx_lpf_fine_adj)) << std::endl; + + return 2.0*_rx_bandwidth; +} + +double xcvr2450::set_tx_bandwidth(double bandwidth){ + //convert complex bandpass to lowpass bandwidth + bandwidth = bandwidth/2.0; + + //compute coarse low pass cutoff frequency setting + _max2829_regs.tx_lpf_coarse_adj = bandwidth_to_tx_lpf_coarse_reg(bandwidth); + + //shadow bandwidth setting + _tx_bandwidth = bandwidth; + + //update register + send_reg(0x7); + + UHD_LOGV(often) << boost::format( + "XCVR2450 TX Bandwidth (lp_fc): %f Hz, coarse reg: %d" + ) % _tx_bandwidth % (int(_max2829_regs.tx_lpf_coarse_adj)) << std::endl; + + //convert lowpass back to complex bandpass bandwidth + return 2.0*_tx_bandwidth; +} |