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-rw-r--r--host/lib/usrp/usrp_e100/clock_ctrl.cpp123
-rw-r--r--host/lib/usrp/usrp_e100/clock_ctrl.hpp7
2 files changed, 108 insertions, 22 deletions
diff --git a/host/lib/usrp/usrp_e100/clock_ctrl.cpp b/host/lib/usrp/usrp_e100/clock_ctrl.cpp
index 1fb1a7125..4048218f2 100644
--- a/host/lib/usrp/usrp_e100/clock_ctrl.cpp
+++ b/host/lib/usrp/usrp_e100/clock_ctrl.cpp
@@ -18,10 +18,12 @@
#include "clock_ctrl.hpp"
#include "ad9522_regs.hpp"
#include <uhd/utils/assert.hpp>
+#include <uhd/utils/static.hpp>
#include <boost/cstdint.hpp>
#include "usrp_e100_regs.hpp" //spi slave constants
#include <boost/assign/list_of.hpp>
#include <boost/foreach.hpp>
+#include <boost/format.hpp>
#include <utility>
#include <iostream>
@@ -36,6 +38,62 @@ template <typename div_type, typename bypass_type> static void set_clock_divider
}
/***********************************************************************
+ * Clock rate calculation stuff:
+ * Using the internal VCO between 1400 and 1800 MHz
+ **********************************************************************/
+struct clock_settings_type{
+ size_t ref_clock_doubler, r_counter, a_counter, b_counter, prescaler, vco_divider, clk_divider;
+ size_t get_n_counter(void) const{return prescaler * b_counter + a_counter;}
+ double get_ref_rate(void) const{return 10e6 * ref_clock_doubler;}
+ double get_vco_rate(void) const{return get_ref_rate()/r_counter * get_n_counter();}
+ double get_clk_rate(void) const{return get_vco_rate()/vco_divider;}
+ double get_out_rate(void) const{return get_clk_rate()/clk_divider;}
+ std::string to_pp_string(void) const{
+ return str(boost::format(
+ " r_counter: %d\n"
+ " a_counter: %d\n"
+ " b_counter: %d\n"
+ " prescaler: %d\n"
+ " vco_divider: %d\n"
+ " clk_divider: %d\n"
+ " vco_rate: %fMHz\n"
+ " clk_rate: %fMHz\n"
+ " out_rate: %fMHz\n"
+ )
+ % r_counter
+ % a_counter
+ % b_counter
+ % prescaler
+ % vco_divider
+ % clk_divider
+ % (get_vco_rate()/1e6)
+ % (get_clk_rate()/1e6)
+ % (get_out_rate()/1e6)
+ );
+ }
+};
+
+UHD_SINGLETON_FCN(std::vector<clock_settings_type>, get_clock_settings);
+
+UHD_STATIC_BLOCK(libuhd_usrp_e100_reg_clock_rates){
+ clock_settings_type cs;
+ cs.ref_clock_doubler = 2; //always doubling
+ cs.prescaler = 8; //set to 8 when input is under 2400 MHz
+
+ for (cs.r_counter = 1; cs.r_counter <= 1; cs.r_counter++){
+ for (cs.b_counter = 3; cs.b_counter <= 10; cs.b_counter++){
+ for (cs.a_counter = 0; cs.a_counter <= 10; cs.a_counter++){
+ for (cs.vco_divider = 2; cs.vco_divider <= 6; cs.vco_divider++){
+ for (cs.clk_divider = 1; cs.clk_divider <= 32; cs.clk_divider++){
+ if (cs.get_vco_rate() > 1800e6) continue;
+ if (cs.get_vco_rate() < 1400e6) continue;
+ if (cs.get_out_rate() < 32e6) continue; //lowest we allow for GPMC interface
+ //std::cout << (cs.get_out_rate()/1e6) << std::endl;
+ get_clock_settings().push_back(cs);
+ }}}}}
+}
+
+/***********************************************************************
* Constants
**********************************************************************/
static const bool enable_test_clock = false;
@@ -72,25 +130,45 @@ public:
_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;
+ this->use_internal_ref();
- _ad9522_regs.set_r_counter(r_counter);
- _ad9522_regs.a_counter = a_counter;
- _ad9522_regs.set_b_counter(b_counter);
+ this->set_fpga_clock_rate(64e6); //initialize to something
+
+ this->enable_rx_dboard_clock(false);
+ this->enable_tx_dboard_clock(false);
+ }
+
+ ~usrp_e100_clock_ctrl_impl(void){
+ this->enable_rx_dboard_clock(false);
+ this->enable_tx_dboard_clock(false);
+ }
+
+ void set_clock_settings_with_internal_vco(const clock_settings_type &cs){
+ _ad9522_regs.enable_clock_doubler = (cs.ref_clock_doubler == 2)? 1 : 0;
+
+ _ad9522_regs.set_r_counter(cs.r_counter);
+ _ad9522_regs.a_counter = cs.a_counter;
+ _ad9522_regs.set_b_counter(cs.b_counter);
+ UHD_ASSERT_THROW(cs.prescaler == 8); //assumes this below:
_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_DIV5;
+ switch(cs.vco_divider){
+ case 1: _ad9522_regs.vco_divider = ad9522_regs_t::VCO_DIVIDER_DIV1; break;
+ case 2: _ad9522_regs.vco_divider = ad9522_regs_t::VCO_DIVIDER_DIV2; break;
+ case 3: _ad9522_regs.vco_divider = ad9522_regs_t::VCO_DIVIDER_DIV3; break;
+ case 4: _ad9522_regs.vco_divider = ad9522_regs_t::VCO_DIVIDER_DIV4; break;
+ case 5: _ad9522_regs.vco_divider = ad9522_regs_t::VCO_DIVIDER_DIV5; break;
+ case 6: _ad9522_regs.vco_divider = ad9522_regs_t::VCO_DIVIDER_DIV6; break;
+ }
_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,
+ set_clock_divider(cs.clk_divider,
_ad9522_regs.divider0_low_cycles,
_ad9522_regs.divider0_high_cycles,
_ad9522_regs.divider0_bypass
@@ -98,7 +176,7 @@ public:
//setup codec clock
_ad9522_regs.out3_format = ad9522_regs_t::OUT3_FORMAT_LVDS;
- set_clock_divider(codec_clock_divider,
+ set_clock_divider(cs.clk_divider,
_ad9522_regs.divider1_low_cycles,
_ad9522_regs.divider1_high_cycles,
_ad9522_regs.divider1_bypass
@@ -125,21 +203,22 @@ public:
}
}
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_e100_clock_ctrl_impl(void){
- this->enable_rx_dboard_clock(false);
- this->enable_tx_dboard_clock(false);
+ void set_fpga_clock_rate(double rate){
+ if (rate == 61.44e6){
+ //TODO special settings for external VCXO
+ }
+ else{
+ BOOST_FOREACH(const clock_settings_type &cs, get_clock_settings()){
+ if (rate != cs.get_out_rate()) continue;
+ std::cout << "USRP-E100 clock control:" << std::endl << cs.to_pp_string() << std::endl;
+ set_clock_settings_with_internal_vco(cs);
+ }
+ throw std::runtime_error(str(boost::format(
+ "USRP-E100 clock control: could not find settings for clock rate %fMHz"
+ ) % (rate/1e6)));
+ }
}
double get_fpga_clock_rate(void){
diff --git a/host/lib/usrp/usrp_e100/clock_ctrl.hpp b/host/lib/usrp/usrp_e100/clock_ctrl.hpp
index d613d1473..1f9960ce4 100644
--- a/host/lib/usrp/usrp_e100/clock_ctrl.hpp
+++ b/host/lib/usrp/usrp_e100/clock_ctrl.hpp
@@ -40,6 +40,13 @@ public:
static sptr make(usrp_e100_iface::sptr iface);
/*!
+ * Set the rate of the fpga clock line.
+ * Throws if rate is not valid.
+ * \param rate the new rate in Hz
+ */
+ virtual void set_fpga_clock_rate(double rate) = 0;
+
+ /*!
* Get the rate of the fpga clock line.
* \return the fpga clock rate in Hz
*/
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-29 16:03:29 +0000