diff options
Diffstat (limited to 'host/lib/usrp/dboard/rhodium/rhodium_bands.cpp')
| -rw-r--r-- | host/lib/usrp/dboard/rhodium/rhodium_bands.cpp | 135 |
1 files changed, 135 insertions, 0 deletions
diff --git a/host/lib/usrp/dboard/rhodium/rhodium_bands.cpp b/host/lib/usrp/dboard/rhodium/rhodium_bands.cpp new file mode 100644 index 000000000..ffa206195 --- /dev/null +++ b/host/lib/usrp/dboard/rhodium/rhodium_bands.cpp @@ -0,0 +1,135 @@ +// +// Copyright 2018 Ettus Research, a National Instruments Company +// +// SPDX-License-Identifier: GPL-3.0-or-later +// + +#include "rhodium_radio_ctrl_impl.hpp" +#include "rhodium_constants.hpp" +#include <uhd/utils/math.hpp> + +using namespace uhd; +using namespace uhd::usrp; +using namespace uhd::rfnoc; +using namespace uhd::math::fp_compare; + +namespace { + constexpr double FREQ_COMPARE_EPSILON = 1e-5; + + /* Note on the RX filter bank: + * + * The RX path has 8 bands, which we call BAND0 through BAND7. BAND0 is the + * lowest frequency band. BAND7 is the highest frequency band. + * + * The following constants define lower cutoff frequencies for each band. + * RHODIUM_RX_BAND1_MIN_FREQ is the cutover frequency for switching from + * BAND0 to BAND1, and so on. + * + * Bands 1-7 have both high- and low-pass filters (effectively band + * passes). Band 0 has only low-pass filters. Frequencies have been + * chosen to allow as much of the full bandwidth through unattenuated. + * + * Switch selection logic for these bands can be found in + * rhodium_radio_ctrl_impl::_update_rx_freq_switches() + */ + constexpr double RHODIUM_RX_BAND0_MIN_FREQ = RHODIUM_MIN_FREQ; + constexpr double RHODIUM_RX_BAND1_MIN_FREQ = 450e6; + constexpr double RHODIUM_RX_BAND2_MIN_FREQ = 760e6; + constexpr double RHODIUM_RX_BAND3_MIN_FREQ = 1100e6; + constexpr double RHODIUM_RX_BAND4_MIN_FREQ = 1410e6; + constexpr double RHODIUM_RX_BAND5_MIN_FREQ = 2050e6; + constexpr double RHODIUM_RX_BAND6_MIN_FREQ = 3000e6; + constexpr double RHODIUM_RX_BAND7_MIN_FREQ = 4500e6; + + /* Note on the TX filter bank: + * + * The TX path has 8 bands, which we call BAND0 through BAND7. BAND0 is the + * lowest frequency band. BAND7 is the highest frequency band. + * + * The following constants define lower cutoff frequencies for each band. + * RHODIUM_TX_BAND1_MIN_FREQ is the cutover frequency for switching from + * BAND0 to BAND1, and so on. + * + * All filters on the TX filter bank are low pass filters (no high pass + * filters). Frequencies have been chosen to allow as much of the full + * bandwidth through unattenuated. + * + * Switch selection logic for these bands can be found in + * rhodium_radio_ctrl_impl::_update_tx_freq_switches() + */ + constexpr double RHODIUM_TX_BAND0_MIN_FREQ = RHODIUM_MIN_FREQ; + constexpr double RHODIUM_TX_BAND1_MIN_FREQ = 450e6; + constexpr double RHODIUM_TX_BAND2_MIN_FREQ = 650e6; + constexpr double RHODIUM_TX_BAND3_MIN_FREQ = 1000e6; + constexpr double RHODIUM_TX_BAND4_MIN_FREQ = 1350e6; + constexpr double RHODIUM_TX_BAND5_MIN_FREQ = 1900e6; + constexpr double RHODIUM_TX_BAND6_MIN_FREQ = 3000e6; + constexpr double RHODIUM_TX_BAND7_MIN_FREQ = 4100e6; +} + +rhodium_radio_ctrl_impl::rx_band +rhodium_radio_ctrl_impl::_map_freq_to_rx_band(const double freq) { + + auto freq_compare = fp_compare_epsilon<double>(freq, RHODIUM_FREQ_COMPARE_EPSILON); + + if (freq_compare < RHODIUM_RX_BAND0_MIN_FREQ) { + return rx_band::RX_BAND_INVALID; + } else if (freq_compare < RHODIUM_RX_BAND1_MIN_FREQ) { + return rx_band::RX_BAND_0; + } else if (freq_compare < RHODIUM_RX_BAND2_MIN_FREQ) { + return rx_band::RX_BAND_1; + } else if (freq_compare < RHODIUM_RX_BAND3_MIN_FREQ) { + return rx_band::RX_BAND_2; + } else if (freq_compare < RHODIUM_RX_BAND4_MIN_FREQ) { + return rx_band::RX_BAND_3; + } else if (freq_compare < RHODIUM_RX_BAND5_MIN_FREQ) { + return rx_band::RX_BAND_4; + } else if (freq_compare < RHODIUM_RX_BAND6_MIN_FREQ) { + return rx_band::RX_BAND_5; + } else if (freq_compare < RHODIUM_RX_BAND7_MIN_FREQ) { + return rx_band::RX_BAND_6; + } else if (freq_compare <= RHODIUM_MAX_FREQ) { + return rx_band::RX_BAND_7; + } else { + return rx_band::RX_BAND_INVALID; + } +} + +rhodium_radio_ctrl_impl::tx_band +rhodium_radio_ctrl_impl::_map_freq_to_tx_band(const double freq) { + + auto freq_compare = fp_compare_epsilon<double>(freq, RHODIUM_FREQ_COMPARE_EPSILON); + + if (freq_compare < RHODIUM_TX_BAND0_MIN_FREQ) { + return tx_band::TX_BAND_INVALID; + } else if (freq_compare < RHODIUM_TX_BAND1_MIN_FREQ) { + return tx_band::TX_BAND_0; + } else if (freq_compare < RHODIUM_TX_BAND2_MIN_FREQ) { + return tx_band::TX_BAND_1; + } else if (freq_compare < RHODIUM_TX_BAND3_MIN_FREQ) { + return tx_band::TX_BAND_2; + } else if (freq_compare < RHODIUM_TX_BAND4_MIN_FREQ) { + return tx_band::TX_BAND_3; + } else if (freq_compare < RHODIUM_TX_BAND5_MIN_FREQ) { + return tx_band::TX_BAND_4; + } else if (freq_compare < RHODIUM_TX_BAND6_MIN_FREQ) { + return tx_band::TX_BAND_5; + } else if (freq_compare < RHODIUM_TX_BAND7_MIN_FREQ) { + return tx_band::TX_BAND_6; + } else if (freq_compare <= RHODIUM_MAX_FREQ) { + return tx_band::TX_BAND_7; + } else { + return tx_band::TX_BAND_INVALID; + } +} + +bool rhodium_radio_ctrl_impl::_is_rx_lowband(const double freq) +{ + return _map_freq_to_rx_band(freq) == rx_band::RX_BAND_0; +} + +bool rhodium_radio_ctrl_impl::_is_tx_lowband(const double freq) +{ + return _map_freq_to_tx_band(freq) == tx_band::TX_BAND_0; +} + |