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/* -*- c++-*- */
/*
* Copyright 2001,2003,2004 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 version 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.
*/
#include "microtune_4702.h"
#include <stdlib.h>
#include <stdio.h>
#include "i2c.h"
static const double FIRST_IF = 36.00e6;
// The tuner internally has 3 bands: VHF Low, VHF High & UHF.
// These are the recommened boundaries
static const double VHF_High_takeover = 174e6;
static const double UHF_takeover = 470e6;
static int PLL_I2C_ADDR = 0x60;
static unsigned char
control_byte_1 (bool prescaler, int reference_divisor)
{
int c = 0x80;
//Note: Last two divider bits (bits 2 and 3 of this byte) determined later
if (prescaler)
c |= 0x10;
switch (reference_divisor){
case 2:
c |= 0x00; break;
case 4:
c |= 0x01; break;
case 8:
c |= 0x02; break;
case 16:
c |= 0x03; break;
case 32:
c |= 0x04; break;
case 64:
c |= 0x05; break;
case 128:
c |= 0x06; break;
case 256:
c |= 0x07; break;
case 24:
c |= 0x08; break;
case 5:
c |= 0x09; break;
case 10:
c |= 0x0A; break;
case 20:
c |= 0x0B; break;
case 40:
c |= 0x0C; break;
case 80:
c |= 0x0D; break;
case 160:
c |= 0x0E; break;
case 320:
c |= 0x0F; break;
default:
abort ();
}
return c;
}
static unsigned char
control_byte_2 (double target_freq)
{
int c;
if (target_freq < VHF_High_takeover) // VHF low
c = 0x8E;
else if (target_freq < UHF_takeover){ // VHF high
c = 0x05;
if (target_freq < 390e6)
c |= 0x40;
else
c |= 0x80;
}
else { // UHF
c = 0x03;
if (target_freq < 750e6)
c |= 0x80;
else
c |= 0xC0;
}
return c;
}
microtune_4702::microtune_4702 (i2c_sptr i2c, int i2c_addr)
{
d_i2c = i2c;
d_i2c_addr = i2c_addr;
d_reference_divider = 320;
d_prescaler = false;
}
microtune_4702::~microtune_4702 ()
{
// nop
}
/*!
* \brief select RF frequency to be tuned to output frequency.
* \p target_freq is the requested frequency in Hz, \p actual_freq
* is set to the actual frequency tuned. It takes about 100 ms
* for the PLL to settle.
*
* \returns true iff sucessful.
*/
bool
microtune_4702::set_RF_freq (double target_freq, double *p_actual_freq)
{
unsigned char buf[4];
double target_f_osc = target_freq + FIRST_IF;
double f_ref = 4e6 / d_reference_divider;
//int divisor = (int) ((target_f_osc + (f_ref * 4)) / (f_ref * 8));
long int divisor = (long int) (target_f_osc / f_ref);
double actual_freq = (f_ref * divisor) - FIRST_IF;
if (p_actual_freq != 0)
*p_actual_freq = actual_freq;
if ((divisor & ~0x1ffff) != 0) // >17 bit divisor
return false;
buf[0] = ((divisor & 0x07f00) >> 8) & 0xff; // DB1
buf[1] = divisor & 0xff; // DB2
buf[2] = control_byte_1 (d_prescaler, d_reference_divider);
buf[2] = buf[2] | (((divisor & 0x18000) >> 10) & 0xff);
buf[3] = control_byte_2 (target_freq);
printf ("%x\n", PLL_I2C_ADDR);
//#if 0
printf ("set_RF_freq: target: %g MHz actual: %g MHz %02x %02x %02x %02x\n",
target_freq/1e6, actual_freq/1e6, buf[0], buf[1], buf[2], buf[3]);
//#endif
return d_i2c->write (d_i2c_addr, buf, sizeof (buf));
}
/*!
* \returns true iff PLL is locked
*/
bool
microtune_4702::pll_locked_p ()
{
// FIXME
return true;
}
/*!
* \returns the output frequency of the tuner in Hz.
*/
double
microtune_4702::get_output_freq ()
{
return FIRST_IF;
}
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