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path: root/host/lib/usrp/usrp2/clock_ctrl.cpp
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Diffstat (limited to 'host/lib/usrp/usrp2/clock_ctrl.cpp')
-rw-r--r--host/lib/usrp/usrp2/clock_ctrl.cpp57
1 files changed, 54 insertions, 3 deletions
diff --git a/host/lib/usrp/usrp2/clock_ctrl.cpp b/host/lib/usrp/usrp2/clock_ctrl.cpp
index 428d5539b..27ccefb2b 100644
--- a/host/lib/usrp/usrp2/clock_ctrl.cpp
+++ b/host/lib/usrp/usrp2/clock_ctrl.cpp
@@ -22,10 +22,13 @@
#include <uhd/utils/assert.hpp>
#include <boost/cstdint.hpp>
#include <boost/lexical_cast.hpp>
+#include <boost/math/special_functions/round.hpp>
#include <iostream>
using namespace uhd;
+static const bool enb_test_clk = false;
+
/*!
* A usrp2 clock control specific to the ad9510 ic.
*/
@@ -66,13 +69,12 @@ public:
this->enable_external_ref(false);
this->enable_rx_dboard_clock(false);
this->enable_tx_dboard_clock(false);
+ this->enable_mimo_clock_out(false);
/* private clock enables, must be set here */
this->enable_dac_clock(true);
this->enable_adc_clock(true);
-
- /* always driving the mimo reference */
- this->enable_mimo_clock_out(true);
+ this->enable_test_clock(enb_test_clk);
}
~usrp2_clock_ctrl_impl(void){
@@ -83,6 +85,7 @@ public:
this->enable_dac_clock(false);
this->enable_adc_clock(false);
this->enable_mimo_clock_out(false);
+ this->enable_test_clock(false);
}
void enable_mimo_clock_out(bool enb){
@@ -246,6 +249,54 @@ public:
double get_master_clock_rate(void){
return 100e6;
}
+
+ void set_mimo_clock_delay(double delay) {
+ //delay_val 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
+
+ int delay_val = boost::math::iround(delay/9.744e-9*31);
+
+ if(delay_val == 0) {
+ switch(clk_regs.exp) {
+ case 5:
+ _ad9510_regs.delay_control_out5 = 1;
+ break;
+ case 6:
+ _ad9510_regs.delay_control_out6 = 1;
+ break;
+ default:
+ break; //delay not supported on U2 rev 3
+ }
+ } else {
+ switch(clk_regs.exp) {
+ case 5:
+ _ad9510_regs.delay_control_out5 = 0;
+ _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_val;
+ this->write_reg(0x34);
+ this->write_reg(0x35);
+ this->write_reg(0x36);
+ break;
+ case 6:
+ _ad9510_regs.delay_control_out6 = 0;
+ _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_val;
+ this->write_reg(0x38);
+ this->write_reg(0x39);
+ this->write_reg(0x3A);
+ break;
+ default:
+ break;
+ }
+ }
+ }
private:
/*!