diff options
Diffstat (limited to 'gnuradio-core/src/lib/io/microtune_4702.cc')
-rw-r--r-- | gnuradio-core/src/lib/io/microtune_4702.cc | 183 |
1 files changed, 183 insertions, 0 deletions
diff --git a/gnuradio-core/src/lib/io/microtune_4702.cc b/gnuradio-core/src/lib/io/microtune_4702.cc new file mode 100644 index 000000000..9b180ff8b --- /dev/null +++ b/gnuradio-core/src/lib/io/microtune_4702.cc @@ -0,0 +1,183 @@ +/* -*- 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 2, 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., 59 Temple Place - Suite 330, + * Boston, MA 02111-1307, 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; +} |