Software to turn the RTL2832U into a SDR receiver
You can not select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
 
 
 
 
 
rtl-sdr/src/tuner_fc0013.c

500 lines
10 KiB

/*
* Fitipower FC0013 tuner driver
*
* Copyright (C) 2012 Hans-Frieder Vogt <hfvogt@gmx.net>
* partially based on driver code from Fitipower
* Copyright (C) 2010 Fitipower Integrated Technology Inc
*
* modified for use in librtlsdr
* Copyright (C) 2012 Steve Markgraf <steve@steve-m.de>
*
* This program 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 of the License, or
* (at your option) any later version.
*
* This program 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 this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*
*/
#include <stdint.h>
#include <stdio.h>
#include "rtlsdr_i2c.h"
#include "tuner_fc0013.h"
static int fc0013_writereg(void *dev, uint8_t reg, uint8_t val)
{
uint8_t data[2];
data[0] = reg;
data[1] = val;
if (rtlsdr_i2c_write_fn(dev, FC0013_I2C_ADDR, data, 2) < 0)
return -1;
return 0;
}
static int fc0013_readreg(void *dev, uint8_t reg, uint8_t *val)
{
uint8_t data = reg;
if (rtlsdr_i2c_write_fn(dev, FC0013_I2C_ADDR, &data, 1) < 0)
return -1;
if (rtlsdr_i2c_read_fn(dev, FC0013_I2C_ADDR, &data, 1) < 0)
return -1;
*val = data;
return 0;
}
int fc0013_init(void *dev)
{
int ret = 0;
unsigned int i;
uint8_t reg[] = {
0x00, /* reg. 0x00: dummy */
0x09, /* reg. 0x01 */
0x16, /* reg. 0x02 */
0x00, /* reg. 0x03 */
0x00, /* reg. 0x04 */
0x17, /* reg. 0x05 */
0x02, /* reg. 0x06: LPF bandwidth */
0x0a, /* reg. 0x07: CHECK */
0xff, /* reg. 0x08: AGC Clock divide by 256, AGC gain 1/256,
Loop Bw 1/8 */
0x6e, /* reg. 0x09: Disable LoopThrough, Enable LoopThrough: 0x6f */
0xb8, /* reg. 0x0a: Disable LO Test Buffer */
0x82, /* reg. 0x0b: CHECK */
0xfc, /* reg. 0x0c: depending on AGC Up-Down mode, may need 0xf8 */
0x01, /* reg. 0x0d: AGC Not Forcing & LNA Forcing, may need 0x02 */
0x00, /* reg. 0x0e */
0x00, /* reg. 0x0f */
0x00, /* reg. 0x10 */
0x00, /* reg. 0x11 */
0x00, /* reg. 0x12 */
0x00, /* reg. 0x13 */
0x50, /* reg. 0x14: DVB-t High Gain, UHF.
Middle Gain: 0x48, Low Gain: 0x40 */
0x01, /* reg. 0x15 */
};
#if 0
switch (rtlsdr_get_tuner_clock(dev)) {
case FC_XTAL_27_MHZ:
case FC_XTAL_28_8_MHZ:
reg[0x07] |= 0x20;
break;
case FC_XTAL_36_MHZ:
default:
break;
}
#endif
reg[0x07] |= 0x20;
// if (dev->dual_master)
reg[0x0c] |= 0x02;
for (i = 1; i < sizeof(reg); i++) {
ret = fc0013_writereg(dev, i, reg[i]);
if (ret < 0)
break;
}
return ret;
}
int fc0013_rc_cal_add(void *dev, int rc_val)
{
int ret;
uint8_t rc_cal;
int val;
/* push rc_cal value, get rc_cal value */
ret = fc0013_writereg(dev, 0x10, 0x00);
if (ret)
goto error_out;
/* get rc_cal value */
ret = fc0013_readreg(dev, 0x10, &rc_cal);
if (ret)
goto error_out;
rc_cal &= 0x0f;
val = (int)rc_cal + rc_val;
/* forcing rc_cal */
ret = fc0013_writereg(dev, 0x0d, 0x11);
if (ret)
goto error_out;
/* modify rc_cal value */
if (val > 15)
ret = fc0013_writereg(dev, 0x10, 0x0f);
else if (val < 0)
ret = fc0013_writereg(dev, 0x10, 0x00);
else
ret = fc0013_writereg(dev, 0x10, (uint8_t)val);
error_out:
return ret;
}
int fc0013_rc_cal_reset(void *dev)
{
int ret;
ret = fc0013_writereg(dev, 0x0d, 0x01);
if (!ret)
ret = fc0013_writereg(dev, 0x10, 0x00);
return ret;
}
static int fc0013_set_vhf_track(void *dev, uint32_t freq)
{
int ret;
uint8_t tmp;
ret = fc0013_readreg(dev, 0x1d, &tmp);
if (ret)
goto error_out;
tmp &= 0xe3;
if (freq <= 177500000) { /* VHF Track: 7 */
ret = fc0013_writereg(dev, 0x1d, tmp | 0x1c);
} else if (freq <= 184500000) { /* VHF Track: 6 */
ret = fc0013_writereg(dev, 0x1d, tmp | 0x18);
} else if (freq <= 191500000) { /* VHF Track: 5 */
ret = fc0013_writereg(dev, 0x1d, tmp | 0x14);
} else if (freq <= 198500000) { /* VHF Track: 4 */
ret = fc0013_writereg(dev, 0x1d, tmp | 0x10);
} else if (freq <= 205500000) { /* VHF Track: 3 */
ret = fc0013_writereg(dev, 0x1d, tmp | 0x0c);
} else if (freq <= 219500000) { /* VHF Track: 2 */
ret = fc0013_writereg(dev, 0x1d, tmp | 0x08);
} else if (freq < 300000000) { /* VHF Track: 1 */
ret = fc0013_writereg(dev, 0x1d, tmp | 0x04);
} else { /* UHF and GPS */
ret = fc0013_writereg(dev, 0x1d, tmp | 0x1c);
}
error_out:
return ret;
}
int fc0013_set_params(void *dev, uint32_t freq, uint32_t bandwidth)
{
int i, ret = 0;
uint8_t reg[7], am, pm, multi, tmp;
uint64_t f_vco;
uint32_t xtal_freq_div_2;
uint16_t xin, xdiv;
int vco_select = 0;
xtal_freq_div_2 = rtlsdr_get_tuner_clock(dev) / 2;
/* set VHF track */
ret = fc0013_set_vhf_track(dev, freq);
if (ret)
goto exit;
if (freq < 300000000) {
/* enable VHF filter */
ret = fc0013_readreg(dev, 0x07, &tmp);
if (ret)
goto exit;
ret = fc0013_writereg(dev, 0x07, tmp | 0x10);
if (ret)
goto exit;
/* disable UHF & disable GPS */
ret = fc0013_readreg(dev, 0x14, &tmp);
if (ret)
goto exit;
ret = fc0013_writereg(dev, 0x14, tmp & 0x1f);
if (ret)
goto exit;
} else if (freq <= 862000000) {
/* disable VHF filter */
ret = fc0013_readreg(dev, 0x07, &tmp);
if (ret)
goto exit;
ret = fc0013_writereg(dev, 0x07, tmp & 0xef);
if (ret)
goto exit;
/* enable UHF & disable GPS */
ret = fc0013_readreg(dev, 0x14, &tmp);
if (ret)
goto exit;
ret = fc0013_writereg(dev, 0x14, (tmp & 0x1f) | 0x40);
if (ret)
goto exit;
} else {
/* disable VHF filter */
ret = fc0013_readreg(dev, 0x07, &tmp);
if (ret)
goto exit;
ret = fc0013_writereg(dev, 0x07, tmp & 0xef);
if (ret)
goto exit;
/* enable UHF & disable GPS */
ret = fc0013_readreg(dev, 0x14, &tmp);
if (ret)
goto exit;
ret = fc0013_writereg(dev, 0x14, (tmp & 0x1f) | 0x40);
if (ret)
goto exit;
}
/* select frequency divider and the frequency of VCO */
if (freq < 37084000) { /* freq * 96 < 3560000000 */
multi = 96;
reg[5] = 0x82;
reg[6] = 0x00;
} else if (freq < 55625000) { /* freq * 64 < 3560000000 */
multi = 64;
reg[5] = 0x02;
reg[6] = 0x02;
} else if (freq < 74167000) { /* freq * 48 < 3560000000 */
multi = 48;
reg[5] = 0x42;
reg[6] = 0x00;
} else if (freq < 111250000) { /* freq * 32 < 3560000000 */
multi = 32;
reg[5] = 0x82;
reg[6] = 0x02;
} else if (freq < 148334000) { /* freq * 24 < 3560000000 */
multi = 24;
reg[5] = 0x22;
reg[6] = 0x00;
} else if (freq < 222500000) { /* freq * 16 < 3560000000 */
multi = 16;
reg[5] = 0x42;
reg[6] = 0x02;
} else if (freq < 296667000) { /* freq * 12 < 3560000000 */
multi = 12;
reg[5] = 0x12;
reg[6] = 0x00;
} else if (freq < 445000000) { /* freq * 8 < 3560000000 */
multi = 8;
reg[5] = 0x22;
reg[6] = 0x02;
} else if (freq < 593334000) { /* freq * 6 < 3560000000 */
multi = 6;
reg[5] = 0x0a;
reg[6] = 0x00;
} else if (freq < 950000000) { /* freq * 4 < 3800000000 */
multi = 4;
reg[5] = 0x12;
reg[6] = 0x02;
} else {
multi = 2;
reg[5] = 0x0a;
reg[6] = 0x02;
}
f_vco = freq * multi;
if (f_vco >= 3060000000U) {
reg[6] |= 0x08;
vco_select = 1;
}
/* From divided value (XDIV) determined the FA and FP value */
xdiv = (uint16_t)(f_vco / xtal_freq_div_2);
if ((f_vco - xdiv * xtal_freq_div_2) >= (xtal_freq_div_2 / 2))
xdiv++;
pm = (uint8_t)(xdiv / 8);
am = (uint8_t)(xdiv - (8 * pm));
if (am < 2) {
am += 8;
pm--;
}
if (pm > 31) {
reg[1] = am + (8 * (pm - 31));
reg[2] = 31;
} else {
reg[1] = am;
reg[2] = pm;
}
if ((reg[1] > 15) || (reg[2] < 0x0b)) {
fprintf(stderr, "[FC0013] no valid PLL combination "
"found for %u Hz!\n", freq);
return -1;
}
/* fix clock out */
reg[6] |= 0x20;
/* From VCO frequency determines the XIN ( fractional part of Delta
Sigma PLL) and divided value (XDIV) */
xin = (uint16_t)((f_vco - (f_vco / xtal_freq_div_2) * xtal_freq_div_2) / 1000);
xin = (xin << 15) / (xtal_freq_div_2 / 1000);
if (xin >= 16384)
xin += 32768;
reg[3] = xin >> 8;
reg[4] = xin & 0xff;
reg[6] &= 0x3f; /* bits 6 and 7 describe the bandwidth */
switch (bandwidth) {
case 6000000:
reg[6] |= 0x80;
break;
case 7000000:
reg[6] |= 0x40;
break;
case 8000000:
default:
break;
}
/* modified for Realtek demod */
reg[5] |= 0x07;
for (i = 1; i <= 6; i++) {
ret = fc0013_writereg(dev, i, reg[i]);
if (ret)
goto exit;
}
ret = fc0013_readreg(dev, 0x11, &tmp);
if (ret)
goto exit;
if (multi == 64)
ret = fc0013_writereg(dev, 0x11, tmp | 0x04);
else
ret = fc0013_writereg(dev, 0x11, tmp & 0xfb);
if (ret)
goto exit;
/* VCO Calibration */
ret = fc0013_writereg(dev, 0x0e, 0x80);
if (!ret)
ret = fc0013_writereg(dev, 0x0e, 0x00);
/* VCO Re-Calibration if needed */
if (!ret)
ret = fc0013_writereg(dev, 0x0e, 0x00);
if (!ret) {
// msleep(10);
ret = fc0013_readreg(dev, 0x0e, &tmp);
}
if (ret)
goto exit;
/* vco selection */
tmp &= 0x3f;
if (vco_select) {
if (tmp > 0x3c) {
reg[6] &= ~0x08;
ret = fc0013_writereg(dev, 0x06, reg[6]);
if (!ret)
ret = fc0013_writereg(dev, 0x0e, 0x80);
if (!ret)
ret = fc0013_writereg(dev, 0x0e, 0x00);
}
} else {
if (tmp < 0x02) {
reg[6] |= 0x08;
ret = fc0013_writereg(dev, 0x06, reg[6]);
if (!ret)
ret = fc0013_writereg(dev, 0x0e, 0x80);
if (!ret)
ret = fc0013_writereg(dev, 0x0e, 0x00);
}
}
exit:
return ret;
}
int fc0013_set_gain_mode(void *dev, int manual)
{
int ret = 0;
uint8_t tmp = 0;
ret |= fc0013_readreg(dev, 0x0d, &tmp);
if (manual)
tmp |= (1 << 3);
else
tmp &= ~(1 << 3);
ret |= fc0013_writereg(dev, 0x0d, tmp);
/* set a fixed IF-gain for now */
ret |= fc0013_writereg(dev, 0x13, 0x0a);
return ret;
}
int fc0013_lna_gains[] ={
-99, 0x02,
-73, 0x03,
-65, 0x05,
-63, 0x04,
-63, 0x00,
-60, 0x07,
-58, 0x01,
-54, 0x06,
58, 0x0f,
61, 0x0e,
63, 0x0d,
65, 0x0c,
67, 0x0b,
68, 0x0a,
70, 0x09,
71, 0x08,
179, 0x17,
181, 0x16,
182, 0x15,
184, 0x14,
186, 0x13,
188, 0x12,
191, 0x11,
197, 0x10
};
#define GAIN_CNT (sizeof(fc0013_lna_gains) / sizeof(int) / 2)
int fc0013_set_lna_gain(void *dev, int gain)
{
int ret = 0;
unsigned int i;
uint8_t tmp = 0;
ret |= fc0013_readreg(dev, 0x14, &tmp);
/* mask bits off */
tmp &= 0xe0;
for (i = 0; i < GAIN_CNT; i++) {
if ((fc0013_lna_gains[i*2] >= gain) || (i+1 == GAIN_CNT)) {
tmp |= fc0013_lna_gains[i*2 + 1];
break;
}
}
/* set gain */
ret |= fc0013_writereg(dev, 0x14, tmp);
return ret;
}