diff options
Diffstat (limited to 'host/lib/usrp/common/max287x.hpp')
| -rw-r--r-- | host/lib/usrp/common/max287x.hpp | 143 |
1 files changed, 134 insertions, 9 deletions
diff --git a/host/lib/usrp/common/max287x.hpp b/host/lib/usrp/common/max287x.hpp index 3d43802c8..644ec726e 100644 --- a/host/lib/usrp/common/max287x.hpp +++ b/host/lib/usrp/common/max287x.hpp @@ -22,6 +22,7 @@ #include <uhd/types/dict.hpp> #include <uhd/types/ranges.hpp> #include <uhd/utils/log.hpp> +#include <uhd/utils/math.hpp> #include <boost/assign.hpp> #include <boost/function.hpp> #include <boost/thread.hpp> @@ -216,6 +217,11 @@ public: * Check whether this is in a state where it can be synchronized */ virtual bool can_sync(void) = 0; + + /** + * Configure synthesizer for phase synchronization + */ + virtual void config_for_sync(bool enable) = 0; }; /** @@ -247,10 +253,12 @@ public: virtual void set_phase(boost::uint16_t phase); virtual void commit(); virtual bool can_sync(); + virtual void config_for_sync(bool enable); protected: max287x_regs_t _regs; bool _can_sync; + bool _config_for_sync; bool _write_all_regs; private: @@ -290,6 +298,69 @@ public: /** * MAX2871 */ +// Table of frequency ranges for each VCO value. +// The values were derived from sampling multiple +// units over a temperature range of -10 to 40 deg C. +typedef std::map<uint8_t,uhd::range_t> vco_map_t; +static const vco_map_t max2871_vco_map = + boost::assign::map_list_of + (0,uhd::range_t(2767776024.0,2838472816.0)) + (1,uhd::range_t(2838472816.0,2879070053.0)) + (1,uhd::range_t(2879070053.0,2921202504.0)) + (3,uhd::range_t(2921202504.0,2960407579.0)) + (4,uhd::range_t(2960407579.0,3001687422.0)) + (5,uhd::range_t(3001687422.0,3048662562.0)) + (6,uhd::range_t(3048662562.0,3097511550.0)) + (7,uhd::range_t(3097511550.0,3145085864.0)) + (8,uhd::range_t(3145085864.0,3201050835.0)) + (9,uhd::range_t(3201050835.0,3259581909.0)) + (10,uhd::range_t(3259581909.0,3321408729.0)) + (11,uhd::range_t(3321408729.0,3375217285.0)) + (12,uhd::range_t(3375217285.0,3432807972.0)) + (13,uhd::range_t(3432807972.0,3503759088.0)) + (14,uhd::range_t(3503759088.0,3579011283.0)) + (15,uhd::range_t(3579011283.0,3683570865.0)) + (20,uhd::range_t(3683570865.0,3711845712.0)) + (21,uhd::range_t(3711845712.0,3762188221.0)) + (22,uhd::range_t(3762188221.0,3814209551.0)) + (23,uhd::range_t(3814209551.0,3865820020.0)) + (24,uhd::range_t(3865820020.0,3922520021.0)) + (25,uhd::range_t(3922520021.0,3981682709.0)) + (26,uhd::range_t(3981682709.0,4043154280.0)) + (27,uhd::range_t(4043154280.0,4100400020.0)) + (28,uhd::range_t(4100400020.0,4159647583.0)) + (29,uhd::range_t(4159647583.0,4228164842.0)) + (30,uhd::range_t(4228164842.0,4299359879.0)) + (31,uhd::range_t(4299359879.0,4395947962.0)) + (33,uhd::range_t(4395947962.0,4426512061.0)) + (34,uhd::range_t(4426512061.0,4480333656.0)) + (35,uhd::range_t(4480333656.0,4526297331.0)) + (36,uhd::range_t(4526297331.0,4574689510.0)) + (37,uhd::range_t(4574689510.0,4633102021.0)) + (38,uhd::range_t(4633102021.0,4693755616.0)) + (39,uhd::range_t(4693755616.0,4745624435.0)) + (40,uhd::range_t(4745624435.0,4803922123.0)) + (41,uhd::range_t(4803922123.0,4871523881.0)) + (42,uhd::range_t(4871523881.0,4942111286.0)) + (43,uhd::range_t(4942111286.0,5000192446.0)) + (44,uhd::range_t(5000192446.0,5059567510.0)) + (45,uhd::range_t(5059567510.0,5136258187.0)) + (46,uhd::range_t(5136258187.0,5215827295.0)) + (47,uhd::range_t(5215827295.0,5341282949.0)) + (49,uhd::range_t(5341282949.0,5389819310.0)) + (50,uhd::range_t(5389819310.0,5444868434.0)) + (51,uhd::range_t(5444868434.0,5500079705.0)) + (52,uhd::range_t(5500079705.0,5555329630.0)) + (53,uhd::range_t(5555329630.0,5615049833.0)) + (54,uhd::range_t(5615049833.0,5676098527.0)) + (55,uhd::range_t(5676098527.0,5744191577.0)) + (56,uhd::range_t(5744191577.0,5810869917.0)) + (57,uhd::range_t(5810869917.0,5879176194.0)) + (58,uhd::range_t(5879176194.0,5952430629.0)) + (59,uhd::range_t(5952430629.0,6016743964.0)) + (60,uhd::range_t(6016743964.0,6090658690.0)) + (61,uhd::range_t(6090658690.0,6128133570.0)); + class max2871 : public max287x<max2871_regs_t> { public: @@ -319,16 +390,66 @@ public: _regs.feedback_select = max2871_regs_t::FEEDBACK_SELECT_DIVIDED; double freq = max287x<max2871_regs_t>::set_frequency(target_freq, ref_freq, target_pfd_freq, is_int_n); - // According to Maxim support, the following factors must be true to allow for synchronization - if (_regs.r_counter_10_bit == 1 and - _regs.reference_divide_by_2 == max2871_regs_t::REFERENCE_DIVIDE_BY_2_DISABLED and - _regs.reference_doubler == max2871_regs_t::REFERENCE_DOUBLER_DISABLED and + // To support phase synchronization on MAX2871, the same VCO + // subband must be manually programmed on all synthesizers and + // several registers must be set to specific values. + if (_config_for_sync) + { + // Need to manually program VCO value + static const double MIN_VCO_FREQ = 3e9; + double vco_freq = target_freq; + while (vco_freq < MIN_VCO_FREQ) + vco_freq *=2; + uint8_t vco_index = 0xFF; + BOOST_FOREACH(const vco_map_t::value_type &vco, max2871_vco_map) + { + if (uhd::math::fp_compare::fp_compare_epsilon<double>(vco_freq) < vco.second.stop()) + { + vco_index = vco.first; + break; + } + } + if (vco_index == 0xFF) + throw uhd::index_error("Invalid VCO frequency"); + + // Settings required for phase synchronization as per MAX2871 datasheet + _regs.shutdown_vas = max2871_regs_t::SHUTDOWN_VAS_DISABLED; + _regs.vco = vco_index; + _regs.low_noise_and_spur = max2871_regs_t::LOW_NOISE_AND_SPUR_LOW_NOISE; + _regs.f01 = max2871_regs_t::F01_FRAC_N; + _regs.aux_output_select = max2871_regs_t::AUX_OUTPUT_SELECT_DIVIDED; + } + else + { + // Reset values to defaults + _regs.shutdown_vas = max2871_regs_t::SHUTDOWN_VAS_ENABLED; // turn VCO auto selection on + _regs.low_noise_and_spur = max2871_regs_t::LOW_NOISE_AND_SPUR_LOW_SPUR_2; + _regs.f01 = max2871_regs_t::F01_AUTO; + _regs.aux_output_select = max2871_regs_t::AUX_OUTPUT_SELECT_FUNDAMENTAL; + } + + return freq; + } + + void commit() + { + max287x<max2871_regs_t>::commit(); + + // According to Maxim support, the following factors must be true to allow for phase synchronization + if (_regs.int_n_mode == max2871_regs_t::INT_N_MODE_FRAC_N and + _regs.feedback_select == max2871_regs_t::FEEDBACK_SELECT_DIVIDED and + _regs.aux_output_select == max2871_regs_t::AUX_OUTPUT_SELECT_DIVIDED and _regs.rf_divider_select <= max2871_regs_t::RF_DIVIDER_SELECT_DIV16 and - _regs.low_noise_and_spur == max2871_regs_t::LOW_NOISE_AND_SPUR_LOW_NOISE) + _regs.low_noise_and_spur == max2871_regs_t::LOW_NOISE_AND_SPUR_LOW_NOISE and + _regs.f01 == max2871_regs_t::F01_FRAC_N and + _regs.reference_doubler == max2871_regs_t::REFERENCE_DOUBLER_DISABLED and + _regs.reference_divide_by_2 == max2871_regs_t::REFERENCE_DIVIDE_BY_2_DISABLED and + _regs.r_counter_10_bit == 1) { _can_sync = true; + } else { + _can_sync = false; } - return freq; } }; @@ -342,6 +463,7 @@ public: template <typename max287x_regs_t> max287x<max287x_regs_t>::max287x(write_fn func) : _can_sync(false), + _config_for_sync(false), _write_all_regs(true), _write(func), _delay_after_write(true) @@ -397,8 +519,6 @@ double max287x<max287x_regs_t>::set_frequency( double target_pfd_freq, bool is_int_n) { - _can_sync = false; - //map rf divider select output dividers to enums static const uhd::dict<int, typename max287x_regs_t::rf_divider_select_t> rfdivsel_to_enum = boost::assign::map_list_of @@ -791,11 +911,16 @@ void max287x<max287x_regs_t>::commit() } } - template <typename max287x_regs_t> bool max287x<max287x_regs_t>::can_sync(void) { return _can_sync; } +template <typename max287x_regs_t> +void max287x<max287x_regs_t>::config_for_sync(bool enable) +{ + _config_for_sync = enable; +} + #endif // MAX287X_HPP_INCLUDED |