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//
// Copyright 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 "db_wbxng_adf4350.h"
#include <db_base_impl.h>
#include <stdio.h>
#define FREQ_C(freq) uint64_t(freq)
#define DIV_ROUND(num, denom) (((num) + ((denom)/2))/(denom))
#define MIN_INT_DIV uint16_t(23) /* minimum int divider, prescaler 4/5 only */
#define MAX_RF_DIV uint8_t(16) /* max rf divider, divides rf output */
#define MIN_VCO_FREQ FREQ_C(2.2e9) /* minimum vco freq */
#define MAX_VCO_FREQ FREQ_C(4.4e9) /* minimum vco freq */
#define MAX_FREQ DIV_ROUND(MAX_VCO_FREQ, 1) /* upper bound freq (rf div = 1) */
#define MIN_FREQ DIV_ROUND(MIN_VCO_FREQ, MAX_RF_DIV) /* calculated lower bound freq */
#define CE_PIN (1 << 3)
#define PDB_RF_PIN (1 << 2)
#define MUX_PIN (1 << 1)
#define LD_PIN (1 << 0)
adf4350::adf4350()
{
d_regs = new adf4350_regs();
}
adf4350::~adf4350()
{
delete d_regs;
}
std::string
adf4350::compute_register(uint8_t addr)
{
uint32_t data = d_regs->compute_register(addr);
data |= addr;
// create std::string from data here
char s[4];
s[0] = (char)((data >> 24) & 0xff);
s[1] = (char)((data >> 16) & 0xff);
s[2] = (char)((data >> 8) & 0xff);
s[3] = (char)(data & 0xff);
return std::string(s, 4);
}
freq_t
adf4350::_get_max_freq(void)
{
return MAX_FREQ;
}
freq_t
adf4350::_get_min_freq(void)
{
return MIN_FREQ;
}
bool
adf4350::_set_freq(freq_t freq, freq_t refclock_freq)
{
/* Set the frequency by setting int, frac, mod, r, div */
if (freq > MAX_FREQ || freq < MIN_FREQ) return false;
int min_int_div = 23;
d_regs->d_prescaler = 0;
if (freq > FREQ_C(3e9)) {
min_int_div = 75;
d_regs->d_prescaler = 1;
}
/* Ramp up the RF divider until the VCO is within range. */
d_regs->d_divider_select = 0;
while (freq < MIN_VCO_FREQ){
freq <<= 1; //double the freq
d_regs->d_divider_select++; //double the divider
}
/* Ramp up the R divider until the N divider is at least the minimum. */
//d_regs->d_10_bit_r_counter = refclock_freq*MIN_INT_DIV/freq;
d_regs->d_10_bit_r_counter = 2;
uint64_t n_mod;
do{
d_regs->d_10_bit_r_counter++;
n_mod = freq;
n_mod *= d_regs->d_10_bit_r_counter;
n_mod *= d_regs->d_mod;
n_mod /= refclock_freq;
/* calculate int and frac */
d_regs->d_int = n_mod/d_regs->d_mod;
d_regs->d_frac = (n_mod - (freq_t)d_regs->d_int*d_regs->d_mod) & uint16_t(0xfff);
/*
fprintf(stderr,
"VCO %lu KHz, Int %u, Frac %u, Mod %u, R %u, Div %u\n",
freq, d_regs->d_int, d_regs->d_frac,
d_regs->d_mod, d_regs->d_10_bit_r_counter, (1 << d_regs->d_divider_select)
);
*/
}while(d_regs->d_int < min_int_div);
/* calculate the band select so PFD is under 125 KHz */
d_regs->d_8_bit_band_select_clock_divider_value = \
refclock_freq/(FREQ_C(30e3)*d_regs->d_10_bit_r_counter) + 1;
/*
fprintf(stderr, "Band Selection: Div %u, Freq %lu\n",
d_regs->d_8_bit_band_select_clock_divider_value,
refclock_freq/(d_regs->d_8_bit_band_select_clock_divider_value * d_regs->d_10_bit_r_counter) + 1
);
*/
return true;
}
freq_t
adf4350::_get_freq(freq_t refclock_freq)
{
/* Calculate the freq from int, frac, mod, ref, r, div:
* freq = (int + frac/mod) * (ref/r)
* Keep precision by doing multiplies first:
* freq = (((((((int)*mod) + frac)*ref)/mod)/r)/div)
*/
uint64_t freq;
freq = d_regs->d_int;
freq *= d_regs->d_mod;
freq += d_regs->d_frac;
freq *= refclock_freq;
freq /= d_regs->d_mod;
freq /= d_regs->d_10_bit_r_counter;
freq /= (1 << d_regs->d_divider_select);
return freq;
}
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