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-rw-r--r--host/docs/usrp_e1xx.rst16
-rw-r--r--host/examples/rx_timed_samples.cpp9
-rw-r--r--host/lib/usrp/mboard_eeprom.cpp25
-rw-r--r--host/lib/usrp/usrp_e100/clock_ctrl.cpp19
-rw-r--r--host/lib/usrp/usrp_e100/mboard_impl.cpp4
5 files changed, 59 insertions, 14 deletions
diff --git a/host/docs/usrp_e1xx.rst b/host/docs/usrp_e1xx.rst
index 2818a0a65..b2a6ff08c 100644
--- a/host/docs/usrp_e1xx.rst
+++ b/host/docs/usrp_e1xx.rst
@@ -20,7 +20,6 @@ Example device address string representations to specify non-standard FPGA image
Changing the master clock rate
------------------------------------------------------------------------
The master clock rate of the USRP embedded feeds both the FPGA DSP and the codec chip.
-UHD can dynamically reconfigure the clock rate though the set_master_clock_rate() API call.
Hundreds of rates between 32MHz and 64MHz are available.
A few notable rates are:
@@ -36,8 +35,12 @@ To use the 61.44MHz clock rate, the USRP embedded will require two jumpers to be
* J16 is a two pin header, remove the jumper (or leave it on pin1 only)
* J15 is a three pin header, move the jumper to (pin1, pin2)
-For the correct clock settings, call usrp->set_master_clock_rate(61.44e6)
-before any other parameters are set in your application.
+Then run the following commands to record the setting in the EEPROM:
+::
+
+ cd <install-path>/share/uhd/utils
+ ./usrp_burn_mb_eeprom --key=master_clock_rate --val=61.44e6
+
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Set other rates - uses internal VCO
@@ -47,8 +50,11 @@ To use other clock rates, the jumpers will need to be in the default position.
* J16 is a two pin header, move the jumper to (pin1, pin2)
* J15 is a three pin header, move the jumper to (pin2, pin3)
-For the correct clock settings, call usrp->set_master_clock_rate(rate)
-before any other parameters are set in your application.
+Then run the following commands to record the setting in the EEPROM:
+::
+
+ cd <install-path>/share/uhd/utils
+ ./usrp_burn_mb_eeprom --key=master_clock_rate --val=<rate>
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Clock rate recovery - unbricking
diff --git a/host/examples/rx_timed_samples.cpp b/host/examples/rx_timed_samples.cpp
index 28d7ee466..05cc0717b 100644
--- a/host/examples/rx_timed_samples.cpp
+++ b/host/examples/rx_timed_samples.cpp
@@ -32,7 +32,7 @@ int UHD_SAFE_MAIN(int argc, char *argv[]){
std::string args;
double seconds_in_future;
size_t total_num_samps;
- double rate, clock;
+ double rate;
//setup the program options
po::options_description desc("Allowed options");
@@ -41,7 +41,6 @@ int UHD_SAFE_MAIN(int argc, char *argv[]){
("args", po::value<std::string>(&args)->default_value(""), "single uhd device address args")
("secs", po::value<double>(&seconds_in_future)->default_value(1.5), "number of seconds in the future to receive")
("nsamps", po::value<size_t>(&total_num_samps)->default_value(10000), "total number of samples to receive")
- ("clock", po::value<double>(&clock), "master clock frequency in Hz")
("rate", po::value<double>(&rate)->default_value(100e6/16), "rate of incoming samples")
("dilv", "specify to disable inner-loop verbose")
;
@@ -63,12 +62,6 @@ int UHD_SAFE_MAIN(int argc, char *argv[]){
uhd::usrp::multi_usrp::sptr usrp = uhd::usrp::multi_usrp::make(args);
std::cout << boost::format("Using Device: %s") % usrp->get_pp_string() << std::endl;
- //optionally set the clock rate (do before setting anything else)
- if (vm.count("clock")){
- std::cout << boost::format("Setting master clock rate: %f MHz...") % (clock/1e6) << std::endl;
- usrp->set_master_clock_rate(clock);
- }
-
//set the rx sample rate
std::cout << boost::format("Setting RX Rate: %f Msps...") % (rate/1e6) << std::endl;
usrp->set_rx_rate(rate);
diff --git a/host/lib/usrp/mboard_eeprom.cpp b/host/lib/usrp/mboard_eeprom.cpp
index 869a38478..03096691e 100644
--- a/host/lib/usrp/mboard_eeprom.cpp
+++ b/host/lib/usrp/mboard_eeprom.cpp
@@ -223,6 +223,7 @@ struct e100_eeprom_map{
unsigned char env_setting[64];
unsigned char serial[10];
unsigned char name[NAME_MAX_LEN];
+ float master_clock_rate;
};
template <typename T> static const byte_vector_t to_bytes(const T &item){
@@ -254,6 +255,19 @@ static void load_e100(mboard_eeprom_t &mb_eeprom, i2c_iface &iface){
load_e100_string_xx(env_setting);
load_e100_string_xx(serial);
load_e100_string_xx(name);
+
+ //extract the master clock rate
+ float master_clock_rate = 0;
+ const byte_vector_t rate_bytes = iface.read_eeprom(
+ E100_EEPROM_ADDR, offsetof(e100_eeprom_map, master_clock_rate), sizeof(master_clock_rate)
+ );
+ std::copy(
+ rate_bytes.begin(), rate_bytes.end(), //source
+ reinterpret_cast<boost::uint8_t *>(&master_clock_rate) //destination
+ );
+ if (master_clock_rate > 1e6 and master_clock_rate < 1e9){
+ mb_eeprom["master_clock_rate"] = boost::lexical_cast<std::string>(master_clock_rate);
+ }
}
static void store_e100(const mboard_eeprom_t &mb_eeprom, i2c_iface &iface){
@@ -289,6 +303,17 @@ static void store_e100(const mboard_eeprom_t &mb_eeprom, i2c_iface &iface){
store_e100_string_xx(serial);
store_e100_string_xx(name);
+ //store the master clock rate
+ if (mb_eeprom.has_key("master_clock_rate")){
+ const float master_clock_rate = float(boost::lexical_cast<double>(mb_eeprom["master_clock_rate"]));
+ const byte_vector_t rate_bytes(
+ reinterpret_cast<const boost::uint8_t *>(&master_clock_rate),
+ reinterpret_cast<const boost::uint8_t *>(&master_clock_rate) + sizeof(master_clock_rate)
+ );
+ iface.write_eeprom(
+ E100_EEPROM_ADDR, offsetof(e100_eeprom_map, master_clock_rate), rate_bytes
+ );
+ }
}
/***********************************************************************
diff --git a/host/lib/usrp/usrp_e100/clock_ctrl.cpp b/host/lib/usrp/usrp_e100/clock_ctrl.cpp
index 1ac2b804c..851ce29b0 100644
--- a/host/lib/usrp/usrp_e100/clock_ctrl.cpp
+++ b/host/lib/usrp/usrp_e100/clock_ctrl.cpp
@@ -184,7 +184,24 @@ public:
this->use_internal_ref();
- this->set_fpga_clock_rate(DEFAULT_OUTPUT_RATE); //initialize to something
+ //initialize the FPGA clock to something
+ bool fpga_clock_initialized = false;
+ try{
+ if (_iface->mb_eeprom.has_key("master_clock_rate")){
+ std::cout << "Read FPGA clock rate from EEPROM setting." << std::endl;
+ const double master_clock_rate = boost::lexical_cast<double>(_iface->mb_eeprom["master_clock_rate"]);
+ std::cout << boost::format("Initializing FPGA clock to %fMHz...") % (master_clock_rate/1e6) << std::endl;
+ this->set_fpga_clock_rate(master_clock_rate);
+ fpga_clock_initialized = true;
+ }
+ }
+ catch(const std::exception &e){
+ std::cerr << "Error setting FPGA clock rate from EEPROM: " << e.what() << std::endl;
+ }
+ if (not fpga_clock_initialized){ //was not set... use the default rate
+ std::cout << boost::format("Initializing FPGA clock to %fMHz...") % (DEFAULT_OUTPUT_RATE/1e6) << std::endl;
+ this->set_fpga_clock_rate(DEFAULT_OUTPUT_RATE);
+ }
this->enable_test_clock(ENABLE_THE_TEST_OUT);
this->enable_rx_dboard_clock(false);
diff --git a/host/lib/usrp/usrp_e100/mboard_impl.cpp b/host/lib/usrp/usrp_e100/mboard_impl.cpp
index 29e3c5da2..5f4a208d3 100644
--- a/host/lib/usrp/usrp_e100/mboard_impl.cpp
+++ b/host/lib/usrp/usrp_e100/mboard_impl.cpp
@@ -207,6 +207,10 @@ void usrp_e100_impl::mboard_set(const wax::obj &key, const wax::obj &val){
return;
case MBOARD_PROP_CLOCK_RATE:
+ std::cerr << "Helpful message:" << std::endl;
+ std::cerr << " I see that you are setting the master clock rate from the API." << std::endl;
+ std::cerr << " You may find it more convenient to burn this setting into the EEPROM." << std::endl;
+ std::cerr << " See the application notes for USRP-E1XX for further instructions." << std::endl;
_clock_ctrl->set_fpga_clock_rate(val.as<double>());
return;
generated by cgit v1.2.3 (git 2.46.0) at 2025-10-31 14:17:45 +0000