mirror of https://gerrit.osmocom.org/libusrp
328 lines
5.9 KiB
C++
328 lines
5.9 KiB
C++
/* -*- c++ -*- */
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//
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// Copyright 2008,2009 Free Software Foundation, Inc.
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//
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// This file is part of GNU Radio
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//
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// GNU Radio is free software; you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation; either asversion 3, or (at your option)
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// any later version.
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//
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// GNU Radio is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with GNU Radio; see the file COPYING. If not, write to
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// the Free Software Foundation, Inc., 51 Franklin Street,
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// Boston, MA 02110-1301, USA.
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <usrp/db_dtt754.h>
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#include <db_base_impl.h>
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int
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control_byte_1()
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{
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int RS = 0; // 0 = 166.66kHz reference
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int ATP = 7; // Disable internal AGC
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return (0x80 | ATP<<3 | RS);
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}
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int
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control_byte_2()
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{
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int STBY = 0; // powered on
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int XTO = 1; // turn off xtal out, which we don't have
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int ATC = 0; // not clear exactly, possibly speeds up or slows down AGC, which we are not using
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int c = 0xc2 | ATC<<5 | STBY<<4 | XTO;
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return c;
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}
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int
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bandswitch_byte(float freq, float bw)
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{
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int P5, CP, BS;
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if(bw>7.5e6) {
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P5 = 1;
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}
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else {
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P5 = 0;
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}
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if(freq < 121e6) {
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CP = 0;
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BS = 1;
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}
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else if(freq < 141e6) {
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CP = 1;
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BS = 1;
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}
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else if(freq < 166e6) {
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CP = 2;
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BS = 1;
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}
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else if(freq < 182e6) {
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CP = 3;
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BS = 1;
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}
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else if(freq < 286e6) {
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CP = 0;
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BS = 2;
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}
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else if(freq < 386e6) {
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CP = 1;
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BS = 2;
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}
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else if(freq < 446e6) {
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CP = 2;
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BS = 2;
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}
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else if(freq < 466e6) {
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CP = 3;
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BS = 2;
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}
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else if(freq < 506e6) {
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CP = 0;
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BS = 8;
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}
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else if(freq < 761e6) {
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CP = 1;
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BS = 8;
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}
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else if(freq < 846e6) {
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CP = 2;
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BS = 8;
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}
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else { // limit is ~905 MHz
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CP = 3;
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BS = 8;
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}
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return (CP<<6 | P5 << 4 | BS);
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}
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db_dtt754::db_dtt754(usrp_basic_sptr _usrp, int which)
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: db_base(_usrp, which)
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{
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/*
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* Control custom DTT75403-based daughterboard.
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*
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* @param usrp: instance of usrp.source_c
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* @param which: which side: 0 or 1 corresponding to RX_A or RX_B respectively
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* @type which: int
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*/
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// FIXME: DTT754 and DTT768 can probably inherit from a DTT class
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if(d_which == 0) {
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d_i2c_addr = 0x60;
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}
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else {
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d_i2c_addr = 0x62;
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}
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d_bw = 7e6;
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d_IF = 36e6;
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d_f_ref = 166.6666e3;
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d_inverted = false;
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set_gain((gain_min() + gain_max()) / 2.0);
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bypass_adc_buffers(false);
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}
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db_dtt754::~db_dtt754()
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{
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}
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float
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db_dtt754::gain_min()
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{
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return 0;
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}
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float
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db_dtt754::gain_max()
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{
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return 115;
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}
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float
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db_dtt754::gain_db_per_step()
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{
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return 1;
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}
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bool
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db_dtt754::set_gain(float gain)
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{
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assert(gain>=0 && gain<=115);
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float rfgain, ifgain, pgagain;
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if(gain > 60) {
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rfgain = 60;
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gain = gain - 60;
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}
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else {
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rfgain = gain;
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gain = 0;
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}
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if(gain > 35) {
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ifgain = 35;
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gain = gain - 35;
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}
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else {
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ifgain = gain;
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gain = 0;
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}
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pgagain = gain;
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_set_rfagc(rfgain);
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_set_ifagc(ifgain);
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_set_pga(pgagain);
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return true; // can't fail with the assert in place
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}
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double
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db_dtt754::freq_min()
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{
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return 44e6;
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}
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double
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db_dtt754::freq_max()
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{
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return 900e6;
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}
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struct freq_result_t
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db_dtt754::set_freq(double target_freq)
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{
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/*
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* @returns (ok, actual_baseband_freq) where:
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* ok is True or False and indicates success or failure,
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* actual_baseband_freq is the RF frequency that corresponds to DC in the IF.
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*/
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freq_result_t ret = {false, 0.0};
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if(target_freq < freq_min() || target_freq > freq_max()) {
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return ret;
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}
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double target_lo_freq = target_freq + d_IF; // High side mixing
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int divisor = (int)(0.5+(target_lo_freq / d_f_ref));
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double actual_lo_freq = d_f_ref*divisor;
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if((divisor & ~0x7fff) != 0) { // must be 15-bits or less
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return ret;
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}
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// build i2c command string
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std::vector<int> buf(5);
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buf[0] = (divisor >> 8) & 0xff; // DB1
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buf[1] = divisor & 0xff; // DB2
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buf[2] = control_byte_1();
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buf[3] = bandswitch_byte(actual_lo_freq, d_bw);
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buf[4] = control_byte_2();
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bool ok = usrp()->write_i2c(d_i2c_addr, int_seq_to_str (buf));
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d_freq = actual_lo_freq - d_IF;
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ret.ok = ok;
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ret.baseband_freq = actual_lo_freq;
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return ret;
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}
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bool
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db_dtt754::is_quadrature()
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{
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/*
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* Return True if this board requires both I & Q analog channels.
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*
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* This bit of info is useful when setting up the USRP Rx mux register.
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*/
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return false;
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}
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bool
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db_dtt754::spectrum_inverted()
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{
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/*
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* The 43.75 MHz version is inverted
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*/
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return d_inverted;
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}
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bool
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db_dtt754::set_bw(float bw)
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{
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/*
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* Choose the SAW filter bandwidth, either 7MHz or 8MHz)
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*/
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d_bw = bw;
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set_freq(d_freq);
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return true; // FIXME: propagate set_freq result
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}
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void
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db_dtt754::_set_rfagc(float gain)
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{
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assert(gain <= 60 && gain >= 0);
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// FIXME this has a 0.5V step between gain = 60 and gain = 59.
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// Why are there two cases instead of a single linear case?
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float voltage;
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if(gain == 60) {
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voltage = 4;
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}
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else {
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voltage = gain/60.0 * 2.25 + 1.25;
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}
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int dacword = (int)(4096*voltage/1.22/3.3); // 1.22 = opamp gain
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assert(dacword>=0 && dacword<4096);
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usrp()->write_aux_dac(d_which, 1, dacword);
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}
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void
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db_dtt754::_set_ifagc(float gain)
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{
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assert(gain <= 35 && gain >= 0);
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float voltage = gain/35.0 * 2.1 + 1.4;
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int dacword = (int)(4096*voltage/1.22/3.3); // 1.22 = opamp gain
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assert(dacword>=0 && dacword<4096);
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usrp()->write_aux_dac(d_which, 0, dacword);
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}
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void
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db_dtt754::_set_pga(float pga_gain)
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{
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assert(pga_gain >=0 && pga_gain <=20);
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if(d_which == 0) {
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usrp()->set_pga (0, pga_gain);
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}
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else {
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usrp()->set_pga (2, pga_gain);
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}
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}
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