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-rw-r--r--host/lib/ic_reg_maps/CMakeLists.txt4
-rw-r--r--[-rwxr-xr-x]host/lib/ic_reg_maps/gen_tuner_4937di5_regs.py (renamed from host/lib/ic_reg_maps/gen_dtt75403_regs.py)30
-rw-r--r--host/lib/usrp/dboard/db_tvrx.cpp218
3 files changed, 160 insertions, 92 deletions
diff --git a/host/lib/ic_reg_maps/CMakeLists.txt b/host/lib/ic_reg_maps/CMakeLists.txt
index b396db4ca..25f34a280 100644
--- a/host/lib/ic_reg_maps/CMakeLists.txt
+++ b/host/lib/ic_reg_maps/CMakeLists.txt
@@ -70,6 +70,6 @@ LIBUHD_PYTHON_GEN_SOURCE(
)
LIBUHD_PYTHON_GEN_SOURCE(
- ${CMAKE_SOURCE_DIR}/lib/ic_reg_maps/gen_dtt75403_regs.py
- ${CMAKE_BINARY_DIR}/lib/ic_reg_maps/dtt75403_regs.py
+ ${CMAKE_SOURCE_DIR}/lib/ic_reg_maps/gen_tuner_4937di5_regs.py
+ ${CMAKE_BINARY_DIR}/lib/ic_reg_maps/tuner_4937di5_regs.hpp
)
diff --git a/host/lib/ic_reg_maps/gen_dtt75403_regs.py b/host/lib/ic_reg_maps/gen_tuner_4937di5_regs.py
index fe64bd92a..73f7aa3db 100755..100644
--- a/host/lib/ic_reg_maps/gen_dtt75403_regs.py
+++ b/host/lib/ic_reg_maps/gen_tuner_4937di5_regs.py
@@ -24,36 +24,26 @@ REGS_TMPL="""\
########################################################################
## Note: offsets given from perspective of data bits (excludes address)
########################################################################
-##
-########################################################################
-## Address byte
-########################################################################
-adb 0[1:2] 0
-########################################################################
## Divider byte 1
########################################################################
-db1 1[0:6] 0x00
+db1 0[0:6] 0x00
########################################################################
## Divider byte 2
########################################################################
-db2 2[0:7] 0x00
+db2 1[0:7] 0x00
########################################################################
## Control byte 1
########################################################################
-atp 3[3:5] 0 112, 109, 106, 103, 100, 94, 94, disable
-refdiv 3[0:2] 0 166.667khz, 142.857khz, 80khz, 62.5khz, 31.25khz, 50khz
-########################################################################
-## Band switch byte
-########################################################################
-cpsel 4[6:7] 0
-filterbw 4[4] 0 8mhz, 7mhz
-bandsel 4[0:3] 0
+cb7 2[7] 0x01
+cp 2[6] 0x00 low,high
+os 2[0] 0x00 on,off
+rs 2[1:2] 0x00 d512=3,d640=0,d1024=1
+test 2[3:5] 0x01 normal=0x01,cpoff=0x02,cpsink=0x06,cpsrc=0x07,cptest1=0x04,cptest2=0x05
########################################################################
## Control byte 2
########################################################################
-atc 5[5] 0 low, high
-stby 5[4] 0 standby, on
-xto 5[0] 0 disable, enable
+bandsel 3[4:7] 0x03 uhf=0x03,vhfhi=0x09,vhflo=0x0a
+power 3[3] 0x00 on,off
"""
########################################################################
@@ -78,7 +68,7 @@ boost::uint8_t get_reg(boost::uint8_t addr){
if __name__ == '__main__':
import common; common.generate(
- name='dtt75403_regs',
+ name='tuner_4937di5_regs',
regs_tmpl=REGS_TMPL,
body_tmpl=BODY_TMPL,
file=__file__,
diff --git a/host/lib/usrp/dboard/db_tvrx.cpp b/host/lib/usrp/dboard/db_tvrx.cpp
index 5582dbe33..ed6025433 100644
--- a/host/lib/usrp/dboard/db_tvrx.cpp
+++ b/host/lib/usrp/dboard/db_tvrx.cpp
@@ -42,6 +42,7 @@
#include <boost/math/special_functions/round.hpp>
#include <utility>
#include <cmath>
+#include <tuner_4937di5_regs.hpp>
using namespace uhd;
using namespace uhd::usrp;
@@ -57,19 +58,73 @@ static const freq_range_t tvrx_freq_range(50e6, 860e6);
static const prop_names_t tvrx_antennas = ""; //only got one
static const uhd::dict<std::string, gain_range_t> tvrx_gain_ranges = map_list_of
- ("RF", gain_range_t(0, 60, float(60.0/4096))) //both gains are analog and controlled by DAC
- ("IF", gain_range_t(0, 35, float(35.0/4096))) //the old driver used 1dB for both; i don't think that's right?
+ ("RF", gain_range_t(-13.3, 50.3, float(50.3/4096))) //both gains are analog and controlled by DAC
+ ("IF", gain_range_t(-1.5, 32.5, float(32.5/4096))) //the old driver used 1dB for both; i don't think that's right?
;
static const uhd::dict<std::string, freq_range_t> tvrx_freq_ranges = map_list_of
- ("VHFLO", freq_range_t(50e6, 158e6)) //this isn't used outside this driver. just for us.
+ ("VHFLO", freq_range_t(50e6, 158e6))
("VHFHI", freq_range_t(158e6, 454e6))
("UHF" , freq_range_t(454e6, 860e6))
;
-//we might need to spec the various bands for band selection.
+//gain linearization data
+//this is from the datasheet and is dB vs. volts (below)
+//i tried to curve fit this, but it's really just so nonlinear that you'd
+//need dang near as many coefficients as to just map it like this and interp.
+//these numbers are culled from the 4937DI5 datasheet and are probably totally inaccurate
+//but if it's better than the old linear fit i'm happy
+static const uhd::dict<std::string, std::vector<float> > tvrx_rf_gains_db = map_list_of
+ ("VHFLO", std::vector<float>(-6.00000, -6.00000, -6.00000, -4.00000, 0.00000,
+ 5.00000, 10.00000, 17.40000, 26.30000, 36.00000,
+ 43.00000, 48.00000, 49.50000, 50.10000, 50.30000,
+ 50.30000, 50.30000))
+ ("VHFHI", std::vector<float>(-13.3000, -13.3000, -13.3000, -1.0000, 7.7000,
+ 11.0000, 14.7000, 19.3000, 26.1000, 36.0000,
+ 42.7000, 46.0000, 47.0000, 47.8000, 48.2000,
+ 48.2000, 48.2000))
+ ("UHF" , std::vector<float>(-8.0000, -8.0000, -7.0000, 4.0000, 10.2000,
+ 14.5000, 17.5000, 20.0000, 24.5000, 30.8000,
+ 37.0000, 39.8000, 40.7000, 41.6000, 42.6000,
+ 43.2000, 43.8000))
+;
+
+static const std::vector<float> tvrx_if_gains_db =
+ std::vector<float>(-1.50000, -1.50000, -1.50000, -1.00000, 0.20000,
+ 2.10000, 4.30000, 6.40000, 9.00000, 12.00000,
+ 14.80000, 18.20000, 26.10000, 32.50000, 32.50000,
+ 32.50000, 32.50000)
+;
+
+//sample voltages for the above points
+static const std::vector<float> tvrx_rf_gains_volts =
+ std::vector<float>(0.6, 0.8, 1.0, 1.2, 1.4, 1.6, 1.8, 2.0, 2.2, 2.4, 2.6, 2.8, 3.0, 3.2, 3.4, 3.6, 3.8, 4.0);
-static const double tvrx_lo_freq = 36e6; //LO freq of TVRX module
+
+/*!
+ * Execute a linear interpolation to find the voltage corresponding to a desired gain
+ * \param gain the desired gain in dB
+ * \param db_vector the vector of dB readings
+ * \param volts_vector the corresponding vector of voltages db_vector was sampled at
+ * \return a voltage to feed the TVRX analog gain
+ */
+
+static float gain_interp(float gain, std::vector<float> db_vector, std::vector<float> volts_vector) {
+ float volts;
+ gain = std::clip<float>(gain, db_vector.front(), db_vector.back()); //let's not get carried away here
+
+ boost::uint8_t gain_step = 0;
+ for(int i = 0; i < db_vector.size()-1; i++) {
+ if(gain > db_vector[i] && gain < db_vector.[i+1]) gain_step = i;
+ }
+
+
+ return volts;
+}
+
+static const double opamp_gain = 1.22; //onboard DAC opamp gain
+static const double tvrx_lo_freq = 43.75e6; //LO freq of TVRX module
+static const boost::uint16_t reference_divider = 640; //clock reference divider to use
/***********************************************************************
* The tvrx dboard class
@@ -84,40 +139,28 @@ public:
private:
uhd::dict<std::string, float> _gains;
- dtt75403_regs_t _dtt75403_regs;
- boost::uint8_t _dtt75403_addr(void){
+ tuner_4937di5_regs_t _tuner_4937di5_regs;
+ boost::uint8_t _tuner_4937di5_addr(void){
return (this->get_iface()->get_special_props().mangle_i2c_addrs)? 0x60 : 0x61; //ok really? we could rename that call
};
void set_gain(float gain, const std::string &name);
- void send_reg(boost::uint8_t start_reg, boost::uint8_t stop_reg){
- //why is this an inline anyway? bring this out
- start_reg = boost::uint8_t(std::clip(int(start_reg), 0x0, 0x5));
- stop_reg = boost::uint8_t(std::clip(int(stop_reg), 0x0, 0x5));
-
- for(boost::uint8_t start_addr=start_reg; start_addr <= stop_reg; start_addr += sizeof(boost::uint32_t) - 1){
- int num_bytes = int(stop_reg - start_addr + 1) > int(sizeof(boost::uint32_t)) - 1 ? sizeof(boost::uint32_t) - 1 : stop_reg - start_addr + 1;
-
- //create buffer for register data (+1 for start address)
- byte_vector_t regs_vector(num_bytes + 1);
+ void update_regs(void){
+ byte_vector_t regs_vector(4);
- //first byte is the address of first register
- regs_vector[0] = start_addr;
-
- //get the register data
- for(int i=0; i<num_bytes; i++){
- regs_vector[1+i] = _max2118_write_regs.get_reg(start_addr+i);
- if(tvrx_debug) std::cerr << boost::format(
- "tvrx: send reg 0x%02x, value 0x%04x, start_addr = 0x%04x, num_bytes %d"
- ) % int(start_addr+i) % int(regs_vector[1+i]) % int(start_addr) % num_bytes << std::endl;
- }
-
- //send the data
- this->get_iface()->write_i2c(
- _max2118_addr(), regs_vector
- );
+ //get the register data
+ for(int i=0; i<4; i++){
+ regs_vector[i] = _tuner_4937di5_regs.get_reg(i);
+ if(tvrx_debug) std::cerr << boost::format(
+ "tvrx: send reg 0x%02x, value 0x%04x"
+ ) % int(i) % int(regs_vector[i]) << std::endl;
}
+
+ //send the data
+ this->get_iface()->write_i2c(
+ _tuner_4937di5_addr(), regs_vector
+ );
}
};
@@ -138,10 +181,6 @@ UHD_STATIC_BLOCK(reg_tvrx_dboard){
* Structors
**********************************************************************/
tvrx::tvrx(ctor_args_t args) : rx_dboard_base(args){
- //enable only the clocks we need
-
- //TODO: YOU GOT SOME CLOCK SETUP TO DO HERE, DOGGGG
-
this->get_iface()->set_clock_enabled(dboard_iface::UNIT_RX, true);
//set the gpio directions and atr controls (identically)
@@ -165,79 +204,116 @@ tvrx::tvrx(ctor_args_t args) : rx_dboard_base(args){
tvrx::~tvrx(void){
}
+/*! Return a string corresponding to the relevant band
+ * \param freq the frequency of interest
+ * \return a string corresponding to the band
+ */
+
+static std::string get_band(double freq) {
+ BOOST_FOREACH(const std::string &band, tvrx_freq_ranges.keys()) {
+ if(freq >= tvrx_freq_ranges[band].min && freq <= tvrx_freq_ranges[band].max)
+ return name;
+ }
+ UHD_THROW_INVALID_CODE_PATH();
+}
+
/***********************************************************************
* Gain Handling
**********************************************************************/
+/*
+ * Gain accuracy on this thing is basically a crap shoot. In other words, there is none.
+ * The old driver basically picked a linear approximation of the median gain, but the actual
+ * gain slope is heavily nonlinear and varies both with gain and with frequency.
+ * It also probably varies markedly over temperature, but there's only so much we can do.
+ * The best approximation to the RF gain data is fifth-order. If we ignore the curve portions
+ * below 0dB (yes, it's a pad below a certain gain value) and if we ignore the curve portions
+ * near the max-gain asymptotes, it looks pretty close to third-order. This is less insane to
+ * approximate.
+ */
+
/*!
- * Convert a requested gain for the GC2 vga into the integer register value.
+ * Convert a requested gain for the RF gain into a DAC voltage.
* The gain passed into the function will be set to the actual value.
* \param gain the requested gain in dB
- * \return 5 bit the register value
+ * \return dac voltage value
*/
-//yo this should look the same as the below one for the IF, dogg
-static int gain_to_gc2_vga_reg(float &gain){
- int reg = 0;
- gain = std::clip<float>(float(boost::math::iround(gain)), tvrx_gain_ranges["GC2"].min, tvrx_gain_ranges["GC2"].max);
-
- // Half dB steps from 0-5dB, 1dB steps from 5-24dB
- if (gain < 5) {
- reg = boost::math::iround(31.0 - gain/0.5);
- gain = float(boost::math::iround(gain) * 0.5);
- } else {
- reg = boost::math::iround(22.0 - (gain - 4.0));
- gain = float(boost::math::iround(gain));
- }
+static float rf_gain_to_voltage(float &gain){
+ //clip the input
+ gain = std::clip<float>(gain, tvrx_gain_ranges["RF"].min, tvrx_gain_ranges["RF"].max);
+
+ //voltage level constants
+ static const float max_volts = float(4.0), min_volts = float(0.6);
+ static const float slope = (max_volts-min_volts)/tvrx_gain_ranges["RF"].max;
+
+ //this is the voltage at the TVRX gain input
+ float gain_volts = gain*slope + min_volts
+ //this is the voltage at the USRP DAC output
+ float dac_volts = gain_volts / opamp_gain;
+
+ //the actual gain setting
+ gain = (dac_volts - min_volts)/slope;
if (tvrx_debug) std::cerr << boost::format(
- "tvrx GC2 Gain: %f dB, reg: %d"
- ) % gain % reg << std::endl;
+ "tvrx RF AGC gain: %f dB, dac_volts: %f V"
+ ) % gain % dac_volts << std::endl;
- return reg;
+ return dac_volts;
}
/*!
- * Convert a requested gain for the RF gain into the dac_volts value.
+ * Convert a requested gain for the IF gain into a DAC voltage.
* The gain passed into the function will be set to the actual value.
* \param gain the requested gain in dB
* \return dac voltage value
*/
-//yo what about the 1.22 opamp gain of the USRP1 -- is this replicated on U2?
-static float gain_to_rfgain_dac(float &gain){
+static float if_gain_to_voltage(float &gain){
//clip the input
- gain = std::clip<float>(gain, tvrx_gain_ranges["RF"].min, tvrx_gain_ranges["RF"].max);
+ gain = std::clip<float>(gain, tvrx_gain_ranges["IF"].min, tvrx_gain_ranges["IF"].max);
//voltage level constants
- static const float max_volts = float(0), min_volts = float(3.3);
- static const float slope = (max_volts-min_volts)/tvrx_gain_ranges["RF"].max;
+ static const float max_volts = float(4.0), min_volts = float(0.0);
+ static const float slope = (max_volts-min_volts)/tvrx_gain_ranges["IF"].max;
- //calculate the voltage for the aux dac
- float dac_volts = gain*slope + min_volts;
-
- if (tvrx_debug) std::cerr << boost::format(
- "tvrx RFAGC Gain: %f dB, dac_volts: %f V"
- ) % gain % dac_volts << std::endl;
+ //this is the voltage at the TVRX gain input
+ float gain_volts = gain*slope + 1.25;
+ //this is the voltage at the USRP DAC output
+ float dac_volts = gain_volts / opamp_gain;
//the actual gain setting
gain = (dac_volts - min_volts)/slope;
+ if (tvrx_debug) std::cerr << boost::format(
+ "tvrx IF AGC gain: %f dB, dac_volts: %f V"
+ ) % gain % dac_volts << std::endl;
+
return dac_volts;
}
void tvrx::set_gain(float gain, const std::string &name){
assert_has(tvrx_gain_ranges.keys(), name, "tvrx gain name");
if (name == "RF"){
-//should look the same as below
+ this->get_iface()->write_aux_dac(dboard_iface::UNIT_RX, dboard_iface::AUX_DAC_A, rf_gain_to_voltage(gain));
}
else if(name == "IF"){
- //write the new voltage to the aux dac CHECK THIS
- this->get_iface()->write_aux_dac(dboard_iface::UNIT_RX, dboard_iface::AUX_DAC_A, gain_to_gc1_rfvga_dac(gain));
+ this->get_iface()->write_aux_dac(dboard_iface::UNIT_RX, dboard_iface::AUX_DAC_B, if_gain_to_voltage(gain));
}
else UHD_THROW_INVALID_CODE_PATH();
_gains[name] = gain;
}
+/*!
+ * Set the tuner to center the desired frequency at 43.75MHz
+ * \param freq the requested frequency
+ */
+
+void tvrx::set_freq(double freq) {
+
+
+
+}
+
/***********************************************************************
* RX Get and Set
**********************************************************************/
@@ -300,7 +376,6 @@ void tvrx::rx_get(const wax::obj &key_, wax::obj &val){
}
}
-//for smaaht kids to use to set advanced props
void tvrx::rx_set(const wax::obj &key_, const wax::obj &val){
named_prop_t key = named_prop_t::extract(key_);
@@ -309,6 +384,9 @@ void tvrx::rx_set(const wax::obj &key_, const wax::obj &val){
case SUBDEV_PROP_GAIN:
this->set_gain(val.as<float>(), key.name);
return;
+ case SUBDEV_PROP_FREQ:
+ this->set_freq(val.as<double>());
+ return;
default: UHD_THROW_PROP_SET_ERROR();
}
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-16 18:47:35 +0000