diff options
| -rw-r--r-- | host/lib/usrp/usrp2/clock_ctrl.cpp | 46 | ||||
| -rw-r--r-- | host/lib/usrp/usrp2/clock_ctrl.hpp | 8 |
2 files changed, 54 insertions, 0 deletions
diff --git a/host/lib/usrp/usrp2/clock_ctrl.cpp b/host/lib/usrp/usrp2/clock_ctrl.cpp index 7dde88027..73331e594 100644 --- a/host/lib/usrp/usrp2/clock_ctrl.cpp +++ b/host/lib/usrp/usrp2/clock_ctrl.cpp @@ -244,6 +244,52 @@ public: double get_master_clock_rate(void){ return 100e6; } + + void set_mimo_clock_delay(boost::uint8_t delay) { + //delay is a 5-bit value (0-31) for fine control + //the equations below determine delay for a given ramp current, # of caps and fine delay register + //delay range: + //range_ns = 200*((caps+3)/i_ramp_ua)*1.3286 + //offset (zero delay): + //offset_ns = 0.34 + (1600 - i_ramp_ua)*1e-4 + ((caps-1)/ramp)*6 + //delay_ns = offset_ns + range_ns * delay / 31 + + if(delay == 0) { + switch(clk_regs.exp) { + case 5: + _ad9510_regs.delay_control_out5 = 0; + break; + case 6: + _ad9510_regs.delay_control_out6 = 0; + break; + default: + break; //delay not supported on U2 rev 3 + } + } else { + switch(clk_regs.exp) { + case 5: + _ad9510_regs.delay_control_out5 = 1; + _ad9510_regs.ramp_current_out5 = ad9510_regs_t::RAMP_CURRENT_OUT5_200UA; + _ad9510_regs.ramp_capacitor_out5 = ad9510_regs_t::RAMP_CAPACITOR_OUT5_4CAPS; + _ad9510_regs.delay_fine_adjust_out5 = delay; + this->write_reg(0x34); + this->write_reg(0x35); + this->write_reg(0x36); + break; + case 6: + _ad9510_regs.delay_control_out6 = 1; + _ad9510_regs.ramp_current_out6 = ad9510_regs_t::RAMP_CURRENT_OUT6_200UA; + _ad9510_regs.ramp_capacitor_out6 = ad9510_regs_t::RAMP_CAPACITOR_OUT6_4CAPS; + _ad9510_regs.delay_fine_adjust_out6 = delay; + this->write_reg(0x38); + this->write_reg(0x39); + this->write_reg(0x3A); + break; + default: + break; + } + } + } private: /*! diff --git a/host/lib/usrp/usrp2/clock_ctrl.hpp b/host/lib/usrp/usrp2/clock_ctrl.hpp index 10523fa6b..2ec347cac 100644 --- a/host/lib/usrp/usrp2/clock_ctrl.hpp +++ b/host/lib/usrp/usrp2/clock_ctrl.hpp @@ -95,6 +95,14 @@ public: * \param enb true to enable */ virtual void enable_mimo_clock_out(bool enb) = 0; + + /*! + * Set the output delay of the mimo clock + * Used to synchronise daisy-chained USRPs over the MIMO cable + * Can also be used to adjust delay for uneven reference cable lengths + * \param delay in an arbitrary scaling + */ + virtual void set_mimo_clock_delay(boost::uint8_t delay) = 0; }; |