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Diffstat (limited to 'gnuradio-core/src/lib/io/microtune_4702.cc')
-rw-r--r--gnuradio-core/src/lib/io/microtune_4702.cc183
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
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index 000000000..9b180ff8b
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+++ 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;
+}