--- /dev/null
+//
+// Copyright 2008,2009 Free Software Foundation, Inc.
+//
+// This file is part of GNU Radio
+//
+// GNU Radio is free software; you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation; either asversion 3, or (at your option)
+// any later version.
+//
+// GNU Radio is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with GNU Radio; see the file COPYING. If not, write to
+// the Free Software Foundation, Inc., 51 Franklin Street,
+// Boston, MA 02110-1301, USA.
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include <usrp/db_tv_rx.h>
+#include <db_base_impl.h>
+
+/*****************************************************************************/
+
+int
+control_byte_1(bool fast_tuning_p, int reference_divisor)
+{
+ int c = 0x88;
+ if(fast_tuning_p) {
+ c |= 0x40;
+ }
+
+ if(reference_divisor == 512) {
+ c |= 0x3 << 1;
+ }
+ else if(reference_divisor == 640) {
+ c |= 0x0 << 1;
+ }
+ else if(reference_divisor == 1024) {
+ c |= 0x1 << 1;
+ }
+ else {
+ assert(0);
+ }
+
+ return c;
+}
+
+int
+control_byte_2(double target_freq, bool shutdown_tx_PGA)
+{
+ int c;
+ if(target_freq < 158e6) { // VHF low
+ c = 0xa0;
+ }
+ else if(target_freq < 464e6) { // VHF high
+ c = 0x90;
+ }
+ else { // UHF
+ c = 0x30;
+ }
+
+ if(shutdown_tx_PGA) {
+ c |= 0x08;
+ }
+
+ return c;
+}
+
+
+/*****************************************************************************/
+
+
+db_tv_rx::db_tv_rx(usrp_basic_sptr usrp, int which,
+ double first_IF, double second_IF)
+ : db_base(usrp, which)
+{
+ // Handler for Tv Rx daughterboards.
+ //
+ // @param usrp: instance of usrp.source_c
+ // @param which: which side: 0, 1 corresponding to RX_A or RX_B respectively
+
+ if(which == 0) {
+ d_i2c_addr = 0x60;
+ }
+ else {
+ d_i2c_addr = 0x61;
+ }
+
+ d_first_IF = first_IF;
+ d_second_IF = second_IF;
+ d_reference_divisor = 640;
+ d_fast_tuning = false;
+ d_inverted = false; // FIXME get rid of this
+
+ set_gain((gain_min() + gain_max()) / 2.0); // initialize gain
+
+ bypass_adc_buffers(false);
+}
+
+db_tv_rx::~db_tv_rx()
+{
+}
+
+// Gain setting
+void
+db_tv_rx::_set_rfagc(float gain)
+{
+ float voltage;
+
+ assert(gain <= 60 && gain >= 0);
+ // FIXME this has a 0.5V step between gain = 60 and gain = 59.
+ // Why are there two cases instead of a single linear case?
+ if(gain == 60) {
+ voltage = 4;
+ }
+ else {
+ voltage = gain/60.0 * 2.25 + 1.25;
+ }
+ int dacword = int(4096*voltage/1.22/3.3); // 1.22 = opamp gain
+
+ assert(dacword>=0 && dacword<4096);
+ usrp()->write_aux_dac(d_which, 1, dacword);
+}
+
+void
+db_tv_rx::_set_ifagc(float gain)
+{
+ float voltage;
+
+ assert(gain <= 35 && gain >= 0);
+ voltage = gain/35.0 * 2.1 + 1.4;
+ int dacword = int(4096*voltage/1.22/3.3); // 1.22 = opamp gain
+
+ assert(dacword>=0 && dacword<4096);
+ usrp()->write_aux_dac(d_which, 0, dacword);
+}
+
+void
+db_tv_rx::_set_pga(float pga_gain)
+{
+ assert(pga_gain >=0 && pga_gain <=20);
+ if(d_which == 0) {
+ usrp()->set_pga(0, pga_gain);
+ }
+ else {
+ usrp()->set_pga (2, pga_gain);
+ }
+}
+
+double
+db_tv_rx::freq_min()
+{
+ return 50e6;
+}
+
+double
+db_tv_rx::freq_max()
+{
+ return 860e6;
+}
+
+struct freq_result_t
+db_tv_rx::set_freq(double target_freq)
+{
+ // Set the frequency.
+ //
+ // @param freq: target RF frequency in Hz
+ // @type freq: double
+ //
+ // @returns (ok, actual_baseband_freq) where:
+ // ok is True or False and indicates success or failure,
+ // actual_baseband_freq is RF frequency that corresponds to DC in the IF.
+
+ freq_result_t args = {false, 0};
+
+ double fmin = freq_min();
+ double fmax = freq_max();
+ if((target_freq < fmin) || (target_freq > fmax)) {
+ return args;
+ }
+
+ double target_lo_freq = target_freq + d_first_IF; // High side mixing
+ double f_ref = 4.0e6 / (double)(d_reference_divisor); // frequency steps
+
+ int divisor = int((target_lo_freq + (f_ref * 4)) / (f_ref * 8));
+ double actual_lo_freq = (f_ref * 8 * divisor);
+ double actual_freq = actual_lo_freq - d_first_IF;
+
+ if((divisor & ~0x7fff) != 0) { // must be 15-bits or less
+ return args;
+ }
+
+ // build i2c command string
+ std::vector<int> buf(4);
+ buf[0] = (divisor >> 8) & 0xff; // DB1
+ buf[1] = divisor & 0xff; // DB2
+ buf[2] = control_byte_1(d_fast_tuning, d_reference_divisor);
+ buf[3] = control_byte_2(actual_freq, true);
+
+ args.ok = usrp()->write_i2c(d_i2c_addr, int_seq_to_str (buf));
+ args.baseband_freq = actual_freq - d_second_IF;
+ return args;
+}
+
+float
+db_tv_rx::gain_min()
+{
+ return 0;
+}
+
+float
+db_tv_rx::gain_max()
+{
+ return 115;
+}
+
+float
+db_tv_rx::gain_db_per_step()
+{
+ return 1;
+}
+
+bool
+db_tv_rx::set_gain(float gain)
+{
+ // Set the gain.
+ //
+ // @param gain: gain in decibels
+ // @returns True/False
+
+ float rfgain, ifgain, pgagain;
+
+ assert(gain>=0 && gain<=115);
+ if(gain>60) {
+ rfgain = 60;
+ gain = gain - 60;
+ }
+ else {
+ rfgain = gain;
+ gain = 0;
+ }
+
+ if(gain > 35) {
+ ifgain = 35;
+ gain = gain - 35;
+ }
+ else {
+ ifgain = gain;
+ gain = 0;
+ }
+
+ pgagain = gain;
+ _set_rfagc(rfgain);
+ _set_ifagc(ifgain);
+ _set_pga(pgagain);
+
+ return true;
+}
+
+bool
+db_tv_rx::is_quadrature()
+{
+ // Return True if this board requires both I & Q analog channels.
+ return false;
+}
+
+bool
+db_tv_rx::spectrum_inverted()
+{
+ // The 43.75 MHz version is inverted
+ return d_inverted;
+}
projects / debian / gnuradio / blobdiff