diff options
Diffstat (limited to 'host/lib/usrp/usrp_e/clock_ctrl.cpp')
| -rw-r--r-- | host/lib/usrp/usrp_e/clock_ctrl.cpp | 236 |
1 files changed, 236 insertions, 0 deletions
diff --git a/host/lib/usrp/usrp_e/clock_ctrl.cpp b/host/lib/usrp/usrp_e/clock_ctrl.cpp new file mode 100644 index 000000000..62807aec2 --- /dev/null +++ b/host/lib/usrp/usrp_e/clock_ctrl.cpp @@ -0,0 +1,236 @@ +// +// Copyright 2010 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 "clock_ctrl.hpp" +#include "ad9522_regs.hpp" +#include <uhd/utils/assert.hpp> +#include <boost/cstdint.hpp> +#include "usrp_e_regs.hpp" //spi slave constants +#include <boost/assign/list_of.hpp> +#include <boost/foreach.hpp> +#include <utility> +#include <iostream> + +using namespace uhd; + +template <typename div_type, typename bypass_type> static void set_clock_divider( + size_t divider, div_type &low, div_type &high, bypass_type &bypass +){ + high = divider/2 - 1; + low = divider - high - 2; + bypass = (divider == 1)? 1 : 0; +} + +/*********************************************************************** + * Constants + **********************************************************************/ +static const bool enable_test_clock = false; +static const size_t ref_clock_doubler = 2; //enabled below +static const double ref_clock_rate = 10e6 * ref_clock_doubler; + +static const size_t r_counter = 1; +static const size_t a_counter = 0; +static const size_t b_counter = 20 / ref_clock_doubler; +static const size_t prescaler = 8; //set below with enum, set to 8 when input is under 2400 MHz +static const size_t vco_divider = 1; //set below with enum + +static const size_t n_counter = prescaler * b_counter + a_counter; +static const size_t vco_clock_rate = ref_clock_rate/r_counter * n_counter; //between 1400 and 1800 MHz +static const double master_clock_rate = vco_clock_rate/vco_divider; + +static const size_t fpga_clock_divider = size_t(master_clock_rate/64e6); +static const size_t codec_clock_divider = size_t(master_clock_rate/64e6); + +/*********************************************************************** + * Clock Control Implementation + **********************************************************************/ +class usrp_e_clock_ctrl_impl : public usrp_e_clock_ctrl{ +public: + usrp_e_clock_ctrl_impl(usrp_e_iface::sptr iface){ + _iface = iface; + + //init the clock gen registers + //Note: out0 should already be clocking the FPGA or this isnt going to work + _ad9522_regs.sdo_active = ad9522_regs_t::SDO_ACTIVE_SDO_SDIO; + _ad9522_regs.enable_clock_doubler = 1; //enable ref clock doubler + _ad9522_regs.enb_stat_eeprom_at_stat_pin = 0; //use status pin + _ad9522_regs.status_pin_control = 0x1; //n divider + _ad9522_regs.ld_pin_control = 0x00; //dld + _ad9522_regs.refmon_pin_control = 0x12; //show ref2 + + _ad9522_regs.enable_ref2 = 1; + _ad9522_regs.enable_ref1 = 0; + _ad9522_regs.select_ref = ad9522_regs_t::SELECT_REF_REF2; + + _ad9522_regs.set_r_counter(r_counter); + _ad9522_regs.a_counter = a_counter; + _ad9522_regs.set_b_counter(b_counter); + _ad9522_regs.prescaler_p = ad9522_regs_t::PRESCALER_P_DIV8_9; + + _ad9522_regs.pll_power_down = ad9522_regs_t::PLL_POWER_DOWN_NORMAL; + _ad9522_regs.cp_current = ad9522_regs_t::CP_CURRENT_1_2MA; + + _ad9522_regs.vco_calibration_now = 1; //calibrate it! + _ad9522_regs.vco_divider = ad9522_regs_t::VCO_DIVIDER_DIV1; + _ad9522_regs.select_vco_or_clock = ad9522_regs_t::SELECT_VCO_OR_CLOCK_VCO; + + //setup fpga master clock + _ad9522_regs.out0_format = ad9522_regs_t::OUT0_FORMAT_LVDS; + set_clock_divider(fpga_clock_divider, + _ad9522_regs.divider0_low_cycles, + _ad9522_regs.divider0_high_cycles, + _ad9522_regs.divider0_bypass + ); + + //setup codec clock + _ad9522_regs.out3_format = ad9522_regs_t::OUT3_FORMAT_LVDS; + set_clock_divider(codec_clock_divider, + _ad9522_regs.divider1_low_cycles, + _ad9522_regs.divider1_high_cycles, + _ad9522_regs.divider1_bypass + ); + + //setup test clock (same divider as codec clock) + _ad9522_regs.out4_format = ad9522_regs_t::OUT4_FORMAT_CMOS; + _ad9522_regs.out4_cmos_configuration = (enable_test_clock)? + ad9522_regs_t::OUT4_CMOS_CONFIGURATION_A_ON : + ad9522_regs_t::OUT4_CMOS_CONFIGURATION_OFF; + + //setup a list of register ranges to write + typedef std::pair<boost::uint16_t, boost::uint16_t> range_t; + static const std::vector<range_t> ranges = boost::assign::list_of + (range_t(0x000, 0x000)) (range_t(0x010, 0x01F)) + (range_t(0x0F0, 0x0FD)) (range_t(0x190, 0x19B)) + (range_t(0x1E0, 0x1E1)) (range_t(0x230, 0x230)) + ; + + //write initial register values and latch/update + BOOST_FOREACH(const range_t &range, ranges){ + for(boost::uint16_t addr = range.first; addr <= range.second; addr++){ + this->send_reg(addr); + } + } + this->latch_regs(); + //test read: + //boost::uint32_t reg = _ad9522_regs.get_read_reg(0x01b); + //boost::uint32_t result = _iface->transact_spi( + // UE_SPI_SS_AD9522, + // spi_config_t::EDGE_RISE, + // reg, 24, true /*no*/ + //); + //std::cout << "result " << std::hex << result << std::endl; + this->enable_rx_dboard_clock(false); + this->enable_tx_dboard_clock(false); + } + + ~usrp_e_clock_ctrl_impl(void){ + this->enable_rx_dboard_clock(false); + this->enable_tx_dboard_clock(false); + } + + double get_fpga_clock_rate(void){ + return master_clock_rate/fpga_clock_divider; + } + + /*********************************************************************** + * RX Dboard Clock Control (output 9, divider 3) + **********************************************************************/ + void enable_rx_dboard_clock(bool enb){ + _ad9522_regs.out9_format = ad9522_regs_t::OUT9_FORMAT_CMOS; + _ad9522_regs.out9_cmos_configuration = (enb)? + ad9522_regs_t::OUT9_CMOS_CONFIGURATION_B_ON : + ad9522_regs_t::OUT9_CMOS_CONFIGURATION_OFF; + this->send_reg(0x0F9); + this->latch_regs(); + } + + std::vector<double> get_rx_dboard_clock_rates(void){ + std::vector<double> rates; + for(size_t div = 1; div <= 16+16; div++) rates.push_back(master_clock_rate/div); + return rates; + } + + void set_rx_dboard_clock_rate(double rate){ + assert_has(get_rx_dboard_clock_rates(), rate, "rx dboard clock rate"); + size_t divider = size_t(master_clock_rate/rate); + //set the divider registers + set_clock_divider(divider, + _ad9522_regs.divider3_low_cycles, + _ad9522_regs.divider3_high_cycles, + _ad9522_regs.divider3_bypass + ); + this->send_reg(0x199); + this->send_reg(0x19a); + this->latch_regs(); + } + + /*********************************************************************** + * TX Dboard Clock Control (output 6, divider 2) + **********************************************************************/ + void enable_tx_dboard_clock(bool enb){ + _ad9522_regs.out6_format = ad9522_regs_t::OUT6_FORMAT_CMOS; + _ad9522_regs.out6_cmos_configuration = (enb)? + ad9522_regs_t::OUT6_CMOS_CONFIGURATION_B_ON : + ad9522_regs_t::OUT6_CMOS_CONFIGURATION_OFF; + this->send_reg(0x0F6); + this->latch_regs(); + } + + std::vector<double> get_tx_dboard_clock_rates(void){ + return get_rx_dboard_clock_rates(); //same master clock, same dividers... + } + + void set_tx_dboard_clock_rate(double rate){ + assert_has(get_tx_dboard_clock_rates(), rate, "tx dboard clock rate"); + size_t divider = size_t(master_clock_rate/rate); + //set the divider registers + set_clock_divider(divider, + _ad9522_regs.divider2_low_cycles, + _ad9522_regs.divider2_high_cycles, + _ad9522_regs.divider2_bypass + ); + this->send_reg(0x196); + this->send_reg(0x197); + this->latch_regs(); + } + +private: + usrp_e_iface::sptr _iface; + ad9522_regs_t _ad9522_regs; + + void latch_regs(void){ + _ad9522_regs.io_update = 1; + this->send_reg(0x232); + } + + void send_reg(boost::uint16_t addr){ + boost::uint32_t reg = _ad9522_regs.get_write_reg(addr); + //std::cout << "clock control write reg: " << std::hex << reg << std::endl; + _iface->transact_spi( + UE_SPI_SS_AD9522, + spi_config_t::EDGE_RISE, + reg, 24, false /*no rb*/ + ); + } +}; + +/*********************************************************************** + * Clock Control Make + **********************************************************************/ +usrp_e_clock_ctrl::sptr usrp_e_clock_ctrl::make(usrp_e_iface::sptr iface){ + return sptr(new usrp_e_clock_ctrl_impl(iface)); +} |