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//
// Copyright 2011-2012 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/>.
//
#include "adf4351_regs.hpp"
#include "db_sbx_common.hpp"
using namespace uhd;
using namespace uhd::usrp;
using namespace boost::assign;
/***********************************************************************
* Structors
**********************************************************************/
sbx_xcvr::sbx_version4::sbx_version4(sbx_xcvr *_self_sbx_xcvr) {
//register the handle to our base SBX class
self_base = _self_sbx_xcvr;
}
sbx_xcvr::sbx_version4::~sbx_version4(void){
/* NOP */
}
/***********************************************************************
* Tuning
**********************************************************************/
double sbx_xcvr::sbx_version4::set_lo_freq(dboard_iface::unit_t unit, double target_freq) {
UHD_LOGV(often) << boost::format(
"SBX tune: target frequency %f Mhz"
) % (target_freq/1e6) << std::endl;
//clip the input
target_freq = sbx_freq_range.clip(target_freq);
//map prescaler setting to mininmum integer divider (N) values (pg.18 prescaler)
static const uhd::dict<int, int> prescaler_to_min_int_div = map_list_of
(0,23) //adf4351_regs_t::PRESCALER_4_5
(1,75) //adf4351_regs_t::PRESCALER_8_9
;
//map rf divider select output dividers to enums
static const uhd::dict<int, adf4351_regs_t::rf_divider_select_t> rfdivsel_to_enum = map_list_of
(1, adf4351_regs_t::RF_DIVIDER_SELECT_DIV1)
(2, adf4351_regs_t::RF_DIVIDER_SELECT_DIV2)
(4, adf4351_regs_t::RF_DIVIDER_SELECT_DIV4)
(8, adf4351_regs_t::RF_DIVIDER_SELECT_DIV8)
(16, adf4351_regs_t::RF_DIVIDER_SELECT_DIV16)
(32, adf4351_regs_t::RF_DIVIDER_SELECT_DIV32)
(64, adf4351_regs_t::RF_DIVIDER_SELECT_DIV64)
;
//use 8/9 prescaler for vco_freq > 3 GHz (pg.18 prescaler)
adf4351_regs_t::prescaler_t prescaler = target_freq > 3.6e9 ? adf4351_regs_t::PRESCALER_8_9 : adf4351_regs_t::PRESCALER_4_5;
adf435x_tuning_constraints tuning_constraints;
tuning_constraints.force_frac0 = false;
tuning_constraints.band_sel_freq_max = 100e3;
tuning_constraints.ref_doubler_threshold = 12.5e6;
tuning_constraints.int_range = uhd::range_t(prescaler_to_min_int_div[prescaler], 4095); //INT is a 12-bit field
tuning_constraints.pfd_freq_max = 25e6;
tuning_constraints.rf_divider_range = uhd::range_t(1, 64);
double actual_freq;
adf435x_tuning_settings tuning_settings = _tune_adf435x_synth(
target_freq, self_base->get_iface()->get_clock_rate(unit),
tuning_constraints, actual_freq);
//load the register values
adf4351_regs_t regs;
if ((unit == dboard_iface::UNIT_TX) and (actual_freq == sbx_tx_lo_2dbm.clip(actual_freq)))
regs.output_power = adf4351_regs_t::OUTPUT_POWER_2DBM;
else
regs.output_power = adf4351_regs_t::OUTPUT_POWER_5DBM;
regs.frac_12_bit = tuning_settings.frac_12_bit;
regs.int_16_bit = tuning_settings.int_16_bit;
regs.mod_12_bit = tuning_settings.mod_12_bit;
regs.clock_divider_12_bit = tuning_settings.clock_divider_12_bit;
regs.feedback_select = tuning_settings.feedback_after_divider ?
adf4351_regs_t::FEEDBACK_SELECT_DIVIDED :
adf4351_regs_t::FEEDBACK_SELECT_FUNDAMENTAL;
regs.clock_div_mode = adf4351_regs_t::CLOCK_DIV_MODE_RESYNC_ENABLE;
regs.prescaler = prescaler;
regs.r_counter_10_bit = tuning_settings.r_counter_10_bit;
regs.reference_divide_by_2 = tuning_settings.r_divide_by_2_en ?
adf4351_regs_t::REFERENCE_DIVIDE_BY_2_ENABLED :
adf4351_regs_t::REFERENCE_DIVIDE_BY_2_DISABLED;
regs.reference_doubler = tuning_settings.r_doubler_en ?
adf4351_regs_t::REFERENCE_DOUBLER_ENABLED :
adf4351_regs_t::REFERENCE_DOUBLER_DISABLED;
regs.band_select_clock_div = tuning_settings.band_select_clock_div;
UHD_ASSERT_THROW(rfdivsel_to_enum.has_key(tuning_settings.rf_divider));
regs.rf_divider_select = rfdivsel_to_enum[tuning_settings.rf_divider];
//reset the N and R counter
regs.counter_reset = adf4351_regs_t::COUNTER_RESET_ENABLED;
self_base->get_iface()->write_spi(unit, spi_config_t::EDGE_RISE, regs.get_reg(2), 32);
regs.counter_reset = adf4351_regs_t::COUNTER_RESET_DISABLED;
//write the registers
//correct power-up sequence to write registers (5, 4, 3, 2, 1, 0)
int addr;
for(addr=5; addr>=0; addr--){
UHD_LOGV(often) << boost::format(
"SBX SPI Reg (0x%02x): 0x%08x"
) % addr % regs.get_reg(addr) << std::endl;
self_base->get_iface()->write_spi(
unit, spi_config_t::EDGE_RISE,
regs.get_reg(addr), 32
);
}
//return the actual frequency
UHD_LOGV(often) << boost::format(
"SBX tune: actual frequency %f Mhz"
) % (actual_freq/1e6) << std::endl;
return actual_freq;
}
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