Software to turn the RTL2832U into a SDR receiver
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rtl-sdr/src/rtl-sdr.c

539 lines
13 KiB

/*
* rtl-sdr, a poor man's SDR using a Realtek RTL2832 based DVB-stick
* Copyright (C) 2012 by 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, see <http://www.gnu.org/licenses/>.
*/
#include <errno.h>
#include <signal.h>
#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include <math.h>
#include <unistd.h>
#include <libusb.h>
#include "tuner_e4000.h"
#include "tuner_fc0013.h"
/* generic tuner interface functions, shall be moved to the tuner implementations */
int e4k_init(void *dev) { return e4000_Initialize(dev); }
int e4k_exit(void *dev) { return 0; }
int e4k_tune(void *dev, int freq) { return e4000_SetRfFreqHz(dev, freq); }
int e4k_set_bw(void *dev, int bw) { return e4000_SetBandwidthHz(dev, 8000000); }
int fc0012_init(void *dev) { return 0; }
int fc0012_exit(void *dev) { return 0; }
int fc0012_tune(void *dev, int freq) { return 0; }
int fc0012_set_bw(void *dev, int bw) { return 0; }
int fc0013_init(void *dev) { return FC0013_Open(dev); }
int fc0013_exit(void *dev) { return 0; }
int fc0013_tune(void *dev, int freq) {
/* read bandwidth mode to reapply it */
int bw = 0;
//fc0013_GetBandwidthMode(dev, &bw); // FIXME: missing
return FC0013_SetFrequency(dev, freq/1000, bw & 0xff);
}
int fc0013_set_bw(void *dev, int bw) {
/* read frequency to reapply it */
unsigned long freq = 0;
//fc0013_GetRfFreqHz(dev, &freq); // FIXME: missing
return FC0013_SetFrequency(dev, freq/1000, 8);
}
enum rtlsdr_tuners {
RTLSDR_TUNER_UNDEF,
RTLSDR_TUNER_E4000,
RTLSDR_TUNER_FC0012,
RTLSDR_TUNER_FC0013
};
typedef struct rtlsdr_tuner {
enum rtlsdr_tuners tuner;
int(*init)(void *);
int(*exit)(void *);
int(*tune)(void *, int freq /* Hz */);
int(*set_bw)(void *, int bw /* Hz */);
int freq; /* Hz */
int corr; /* ppm */
} rtlsdr_tuner_t;
rtlsdr_tuner_t tuners[] = {
{ RTLSDR_TUNER_E4000, e4k_init, e4k_exit, e4k_tune, e4k_set_bw, 0, 0 },
{ RTLSDR_TUNER_FC0012, fc0012_init, fc0012_exit, fc0012_tune, fc0012_set_bw, 0, 0 },
{ RTLSDR_TUNER_FC0013, fc0013_init, fc0013_exit, fc0013_tune, fc0013_set_bw, 0, 0 },
};
struct rtlsdr_device {
uint16_t vid;
uint16_t pid;
} devices[] = {
{ 0x0bda, 0x2832, /*RTLSDR_TUNER_E4000,*/ }, /* default RTL2832U vid/pid (eg. hama nano) */
{ 0x0bda, 0x2838, /*RTLSDR_TUNER_E4000,*/ }, /* ezcap USB 2.0 DVB-T/DAB/FM stick */
{ 0x0ccd, 0x00b3, /*RTLSDR_TUNER_FC0013,*/ }, /* Terratec NOXON DAB/DAB+ USB-Stick */
{ 0x1f4d, 0xb803, /*RTLSDR_TUNER_FC0012,*/ }, /* GTek T803 */
{ 0x1b80, 0xd3a4, /*RTLSDR_TUNER_FC0013,*/ }, /* Twintech UT-40 */
};
typedef struct {
struct libusb_device_handle *devh;
rtlsdr_tuner_t *tuner;
} rtlsdr_dev_t;
#define CRYSTAL_FREQ 28800000
#define CTRL_IN (LIBUSB_REQUEST_TYPE_VENDOR | LIBUSB_ENDPOINT_IN)
#define CTRL_OUT (LIBUSB_REQUEST_TYPE_VENDOR | LIBUSB_ENDPOINT_OUT)
enum usb_reg {
USB_SYSCTL = 0x2000,
USB_CTRL = 0x2010,
USB_STAT = 0x2014,
USB_EPA_CFG = 0x2144,
USB_EPA_CTL = 0x2148,
USB_EPA_MAXPKT = 0x2158,
USB_EPA_MAXPKT_2 = 0x215a,
USB_EPA_FIFO_CFG = 0x2160,
};
enum sys_reg {
DEMOD_CTL = 0x3000,
GPO = 0x3001,
GPI = 0x3002,
GPOE = 0x3003,
GPD = 0x3004,
SYSINTE = 0x3005,
SYSINTS = 0x3006,
GP_CFG0 = 0x3007,
GP_CFG1 = 0x3008,
SYSINTE_1 = 0x3009,
SYSINTS_1 = 0x300a,
DEMOD_CTL_1 = 0x300b,
IR_SUSPEND = 0x300c,
};
enum blocks {
DEMODB = 0,
USBB = 1,
SYSB = 2,
TUNB = 3,
ROMB = 4,
IRB = 5,
IICB = 6,
};
int rtlsdr_read_array(rtlsdr_dev_t *dev, uint8_t block, uint16_t addr, uint8_t *array, uint8_t len)
{
int r;
uint16_t index = (block << 8);
r = libusb_control_transfer(dev->devh, CTRL_IN, 0, addr, index, array, len, 0);
return r;
}
int rtlsdr_write_array(rtlsdr_dev_t *dev, uint8_t block, uint16_t addr, uint8_t *array, uint8_t len)
{
int r;
uint16_t index = (block << 8) | 0x10;
r = libusb_control_transfer(dev->devh, CTRL_OUT, 0, addr, index, array, len, 0);
return r;
}
int rtlsdr_i2c_write(rtlsdr_dev_t *dev, uint8_t i2c_addr, uint8_t *buffer, int len)
{
uint16_t addr = i2c_addr;
return rtlsdr_write_array(dev, IICB, addr, buffer, len);
}
int rtlsdr_i2c_read(rtlsdr_dev_t *dev, uint8_t i2c_addr, uint8_t *buffer, int len)
{
uint16_t addr = i2c_addr;
return rtlsdr_read_array(dev, IICB, addr, buffer, len);
}
uint16_t rtlsdr_read_reg(rtlsdr_dev_t *dev, uint8_t block, uint16_t addr, uint8_t len)
{
int r;
unsigned char data[2];
uint16_t index = (block << 8);
uint16_t reg;
r = libusb_control_transfer(dev->devh, CTRL_IN, 0, addr, index, data, len, 0);
if (r < 0)
printf("%s failed\n", __FUNCTION__);
reg = (data[1] << 8) | data[0];
return reg;
}
void rtlsdr_write_reg(rtlsdr_dev_t *dev, uint8_t block, uint16_t addr, uint16_t val, uint8_t len)
{
int r;
unsigned char data[2];
uint16_t index = (block << 8) | 0x10;
if (len == 1)
data[0] = val & 0xff;
else
data[0] = val >> 8;
data[1] = val & 0xff;
r = libusb_control_transfer(dev->devh, CTRL_OUT, 0, addr, index, data, len, 0);
if (r < 0)
printf("%s failed\n", __FUNCTION__);
}
uint16_t rtlsdr_demod_read_reg(rtlsdr_dev_t *dev, uint8_t page, uint8_t addr, uint8_t len)
{
int r;
unsigned char data[2];
uint16_t index = page;
uint16_t reg;
addr = (addr << 8) | 0x20;
r = libusb_control_transfer(dev->devh, CTRL_IN, 0, addr, index, data, len, 0);
if (r < 0)
printf("%s failed\n", __FUNCTION__);
reg = (data[1] << 8) | data[0];
return reg;
}
void rtlsdr_demod_write_reg(rtlsdr_dev_t *dev, uint8_t page, uint16_t addr, uint16_t val, uint8_t len)
{
int r;
unsigned char data[2];
uint16_t index = 0x10 | page;
addr = (addr << 8) | 0x20;
if (len == 1)
data[0] = val & 0xff;
else
data[0] = val >> 8;
data[1] = val & 0xff;
r = libusb_control_transfer(dev->devh, CTRL_OUT, 0, addr, index, data, len, 0);
if (r < 0)
printf("%s failed\n", __FUNCTION__);
rtlsdr_demod_read_reg(dev, 0x0a, 0x01, 1);
}
void rtlsdr_set_i2c_repeater(rtlsdr_dev_t *dev, int on)
{
rtlsdr_demod_write_reg(dev, 1, 0x01, on ? 0x18 : 0x10, 1);
}
void rtlsdr_init_baseband(rtlsdr_dev_t *dev)
{
unsigned int i;
/* default FIR coefficients used for DAB/FM by the Windows driver,
* the DVB driver uses different ones */
uint8_t fir_coeff[] = {
0xca, 0xdc, 0xd7, 0xd8, 0xe0, 0xf2, 0x0e, 0x35, 0x06, 0x50,
0x9c, 0x0d, 0x71, 0x11, 0x14, 0x71, 0x74, 0x19, 0x41, 0x00,
};
/* initialize USB */
rtlsdr_write_reg(dev, USBB, USB_SYSCTL, 0x09, 1);
rtlsdr_write_reg(dev, USBB, USB_EPA_MAXPKT, 0x0002, 2);
rtlsdr_write_reg(dev, USBB, USB_EPA_CTL, 0x1002, 2);
/* poweron demod */
rtlsdr_write_reg(dev, SYSB, DEMOD_CTL_1, 0x22, 1);
rtlsdr_write_reg(dev, SYSB, DEMOD_CTL, 0xe8, 1);
/* reset demod (bit 3, soft_rst) */
rtlsdr_demod_write_reg(dev, 1, 0x01, 0x14, 1);
rtlsdr_demod_write_reg(dev, 1, 0x01, 0x10, 1);
/* disable spectrum inversion and adjacent channel rejection */
rtlsdr_demod_write_reg(dev, 1, 0x15, 0x00, 1);
rtlsdr_demod_write_reg(dev, 1, 0x16, 0x0000, 2);
/* set IF-frequency to 0 Hz */
rtlsdr_demod_write_reg(dev, 1, 0x19, 0x0000, 2);
/* set FIR coefficients */
for (i = 0; i < sizeof (fir_coeff); i++)
rtlsdr_demod_write_reg(dev, 1, 0x1c + i, fir_coeff[i], 1);
rtlsdr_demod_write_reg(dev, 0, 0x19, 0x25, 1);
/* init FSM state-holding register */
rtlsdr_demod_write_reg(dev, 1, 0x93, 0xf0, 1);
/* disable AGC (en_dagc, bit 0) */
rtlsdr_demod_write_reg(dev, 1, 0x11, 0x00, 1);
/* disable PID filter (enable_PID = 0) */
rtlsdr_demod_write_reg(dev, 0, 0x61, 0x60, 1);
/* opt_adc_iq = 0, default ADC_I/ADC_Q datapath */
rtlsdr_demod_write_reg(dev, 0, 0x06, 0x80, 1);
/* Enable Zero-IF mode (en_bbin bit), DC cancellation (en_dc_est),
* IQ estimation/compensation (en_iq_comp, en_iq_est) */
rtlsdr_demod_write_reg(dev, 1, 0xb1, 0x1b, 1);
}
int rtlsdr_set_center_freq(rtlsdr_dev_t *dev, uint32_t freq)
{
rtlsdr_set_i2c_repeater(dev, 1);
if (dev->tuner) {
dev->tuner->freq = freq;
double f = (double) freq;
f *= 1.0 + dev->tuner->corr / 1e6;
dev->tuner->tune((void *)dev, (int) f);
printf("Tuned to %i Hz\n", freq);
}
rtlsdr_set_i2c_repeater(dev, 0);
return 0;
}
int rtlsdr_get_center_freq(rtlsdr_dev_t *dev)
{
return 0; // TODO: implement
}
int rtlsdr_set_freq_correction(rtlsdr_dev_t *dev, int32_t ppm)
{
if (dev->tuner) {
if (dev->tuner->corr == ppm)
return -1;
dev->tuner->corr = ppm;
/* retune to apply new correction value */
rtlsdr_set_center_freq(dev, dev->tuner->freq);
}
return 0;
}
int32_t rtlsdr_get_freq_correction(rtlsdr_dev_t *dev)
{
if (dev->tuner)
return dev->tuner->corr;
else
return 0;
}
void rtlsdr_set_sample_rate(rtlsdr_dev_t *dev, uint32_t samp_rate)
{
uint16_t tmp;
uint32_t rsamp_ratio;
double real_rate;
/* check for the maximum rate the resampler supports */
if (samp_rate > 3200000)
samp_rate = 3200000;
rsamp_ratio = (CRYSTAL_FREQ * pow(2, 22)) / samp_rate;
rsamp_ratio &= ~3;
real_rate = (CRYSTAL_FREQ * pow(2, 22)) / rsamp_ratio;
printf("Setting sample rate: %.3f Hz\n", real_rate);
if (dev->tuner)
dev->tuner->set_bw((void *)dev, real_rate);
tmp = (rsamp_ratio >> 16);
rtlsdr_demod_write_reg(dev, 1, 0x9f, tmp, 2);
tmp = rsamp_ratio & 0xffff;
rtlsdr_demod_write_reg(dev, 1, 0xa1, tmp, 2);
}
int rtlsdr_get_sample_rate(rtlsdr_dev_t *dev)
{
return 0; // TODO: implement
}
int rtlsdr_init(void)
{
return libusb_init(NULL);
}
void rtlsdr_exit(void)
{
libusb_exit(NULL);
}
uint32_t rtlsdr_get_device_count(void)
{
int i, j;
libusb_device **list;
uint32_t device_count = 0;
struct libusb_device_descriptor dd;
ssize_t cnt = libusb_get_device_list(NULL, &list);
for (i = 0; i < cnt; i++) {
libusb_get_device_descriptor(list[i], &dd);
for (j = 0; j < sizeof(devices)/sizeof(struct rtlsdr_device); j++ ) {
if ( devices[j].vid == dd.idVendor && devices[j].pid == dd.idProduct ) {
device_count++;
}
}
}
libusb_free_device_list(list, 0);
return device_count;
}
const char *rtlsdr_get_device_name(uint32_t index)
{
libusb_device **list;
ssize_t cnt = libusb_get_device_list(NULL, &list);
if (index > cnt - 1)
return NULL;
/*libusb_device *device = list[index];*/
libusb_free_device_list(list, 0);
return "TODO: implement";
}
rtlsdr_dev_t *rtlsdr_open(int index)
{
int r;
int i, j;
libusb_device **list;
rtlsdr_dev_t * dev = NULL;
libusb_device *device = NULL;
uint32_t device_count = 0;
struct libusb_device_descriptor dd;
dev = malloc(sizeof(rtlsdr_dev_t));
memset(dev, 0, sizeof(rtlsdr_dev_t));
ssize_t cnt = libusb_get_device_list(NULL, &list);
for (i = 0; i < cnt; i++) {
device = list[i];
libusb_get_device_descriptor(list[i], &dd);
for (j = 0; j < sizeof(devices)/sizeof(struct rtlsdr_device); j++ ) {
if ( devices[j].vid == dd.idVendor && devices[j].pid == dd.idProduct ) {
device_count++;
if (index == device_count - 1)
break;
}
}
if (index == device_count - 1)
break;
device = NULL;
}
if (!device)
goto err;
r = libusb_open(device, &dev->devh);
if (r < 0) {
libusb_free_device_list(list, 0);
fprintf(stderr, "usb_open error %d\n", r);
goto err;
}
libusb_free_device_list(list, 0);
unsigned char buffer[256];
libusb_get_string_descriptor_ascii(dev->devh, 0, buffer, sizeof(buffer) );
printf("sn#: %s\n", buffer);
libusb_get_string_descriptor_ascii(dev->devh, 1, buffer, sizeof(buffer) );
printf("manufacturer: %s\n", buffer);
libusb_get_string_descriptor_ascii(dev->devh, 2, buffer, sizeof(buffer) );
printf("product: %s\n", buffer);
r = libusb_claim_interface(dev->devh, 0);
if (r < 0) {
fprintf(stderr, "usb_claim_interface error %d\n", r);
goto err;
}
rtlsdr_init_baseband(dev);
// TODO: probe the tuner and set dev->tuner member to appropriate tuner object
// dev->tuner = &tuners[...];
return dev;
err:
return NULL;
}
int rtlsdr_close(rtlsdr_dev_t *dev)
{
libusb_release_interface(dev->devh, 0);
libusb_close(dev->devh);
free(dev);
return 0;
}
int rtlsdr_reset_buffer(rtlsdr_dev_t *dev)
{
return 0; // TODO: implement
}
int rtlsdr_read_sync(rtlsdr_dev_t *dev, void *buf, int len, int *n_read)
{
return libusb_bulk_transfer(dev->devh, 0x81, buf, len, n_read, 3000);
}
#if 0
int rtlsdr_async_loop(rtlsdr_dev_t *dev, rtlsdr_async_read_cb_t cb, void *ctx)
{
return 0;
}
#endif