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rtl-sdr/src/main.c

428 lines
9.0 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"
#define READLEN (16 * 16384)
#define CTRL_IN (LIBUSB_REQUEST_TYPE_VENDOR | LIBUSB_ENDPOINT_IN)
#define CTRL_OUT (LIBUSB_REQUEST_TYPE_VENDOR | LIBUSB_ENDPOINT_OUT)
/* ezcap USB 2.0 DVB-T/DAB/FM stick */
#define EZCAP_VID 0x0bda
#define EZCAP_PID 0x2838
/* Terratec NOXON DAB/DAB+ USB-Stick */
#define NOXON_VID 0x0ccd
#define NOXON_PID 0x00b3
#define CRYSTAL_FREQ 28800000
static struct libusb_device_handle *devh = NULL;
static int do_exit = 0;
enum TUNER_TYPE {
TUNER_E4000,
TUNER_FC0013
} tuner_type;
static int find_device(void)
{
devh = libusb_open_device_with_vid_pid(NULL, EZCAP_VID, EZCAP_PID);
if (devh > 0) {
tuner_type = TUNER_E4000;
printf("Found ezcap stick with E4000 tuner\n");
return 0;
}
devh = libusb_open_device_with_vid_pid(NULL, NOXON_VID, NOXON_PID);
if (devh > 0) {
tuner_type = TUNER_FC0013;
printf("Found Terratec NOXON stick with FC0013 tuner\n");
return 0;
}
return -EIO;
}
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 rtl_read_array(uint8_t block, uint16_t addr, uint8_t *array, uint8_t len)
{
int r;
uint16_t index = (block << 8);
r = libusb_control_transfer(devh, CTRL_IN, 0, addr, index, array, len, 0);
return r;
}
int rtl_write_array(uint8_t block, uint16_t addr, uint8_t *array, uint8_t len)
{
int r;
uint16_t index = (block << 8) | 0x10;
r = libusb_control_transfer(devh, CTRL_OUT, 0, addr, index, array, len, 0);
return r;
}
int rtl_i2c_write(uint8_t i2c_addr, uint8_t *buffer, int len)
{
uint16_t addr = i2c_addr;
return rtl_write_array(IICB, addr, buffer, len);
}
int rtl_i2c_read(uint8_t i2c_addr, uint8_t *buffer, int len)
{
uint16_t addr = i2c_addr;
return rtl_read_array(IICB, addr, buffer, len);
}
uint16_t rtl_read_reg(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(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 rtl_write_reg(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(devh, CTRL_OUT, 0, addr, index, data, len, 0);
if (r < 0)
printf("%s failed\n", __FUNCTION__);
}
uint16_t demod_read_reg(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(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 demod_write_reg(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(devh, CTRL_OUT, 0, addr, index, data, len, 0);
if (r < 0)
printf("%s failed\n", __FUNCTION__);
demod_read_reg(0x0a, 0x01, 1);
}
void set_samp_rate(uint32_t samp_rate)
{
uint16_t tmp;
uint32_t rsamp_ratio;
/* check for the maximum rate the resampler supports */
if (samp_rate > 3200000)
samp_rate = 3200000;
printf("Setting sample rate: %i Hz\n", samp_rate);
rsamp_ratio = (CRYSTAL_FREQ * pow(2, 22)) / samp_rate;
rsamp_ratio &= ~3;
tmp = (rsamp_ratio >> 16);
demod_write_reg(1, 0x9f, tmp, 2);
tmp = rsamp_ratio & 0xffff;
demod_write_reg(1, 0xa1, tmp, 2);
}
void set_i2c_repeater(int on)
{
demod_write_reg(1, 0x01, on ? 0x18 : 0x10, 1);
}
void rtl_init(void)
{
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 */
rtl_write_reg(USBB, USB_SYSCTL, 0x09, 1);
rtl_write_reg(USBB, USB_EPA_MAXPKT, 0x0002, 2);
rtl_write_reg(USBB, USB_EPA_CTL, 0x1002, 2);
/* poweron demod */
rtl_write_reg(SYSB, DEMOD_CTL_1, 0x22, 1);
rtl_write_reg(SYSB, DEMOD_CTL, 0xe8, 1);
/* reset demod (bit 3, soft_rst) */
demod_write_reg(1, 0x01, 0x14, 1);
demod_write_reg(1, 0x01, 0x10, 1);
/* disable spectrum inversion and adjacent channel rejection */
demod_write_reg(1, 0x15, 0x00, 1);
demod_write_reg(1, 0x16, 0x0000, 2);
/* set IF-frequency to 0 Hz */
demod_write_reg(1, 0x19, 0x0000, 2);
/* set FIR coefficients */
for (i = 0; i < sizeof (fir_coeff); i++)
demod_write_reg(1, 0x1c + i, fir_coeff[i], 1);
demod_write_reg(0, 0x19, 0x25, 1);
/* init FSM state-holding register */
demod_write_reg(1, 0x93, 0xf0, 1);
/* disable AGC (en_dagc, bit 0) */
demod_write_reg(1, 0x11, 0x00, 1);
/* disable PID filter (enable_PID = 0) */
demod_write_reg(0, 0x61, 0x60, 1);
/* opt_adc_iq = 0, default ADC_I/ADC_Q datapath */
demod_write_reg(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) */
demod_write_reg(1, 0xb1, 0x1b, 1);
}
void tuner_init(int frequency)
{
set_i2c_repeater(1);
switch (tuner_type) {
case TUNER_E4000:
e4000_Initialize(1);
e4000_SetBandwidthHz(1, 8000000);
e4000_SetRfFreqHz(1, frequency);
break;
case TUNER_FC0013:
FC0013_Open();
FC0013_SetFrequency(frequency/1000, 8);
break;
default:
printf("No valid tuner available!");
break;
}
printf("Tuned to %i Hz\n", frequency);
set_i2c_repeater(0);
}
void usage(void)
{
printf("rtl-sdr, an I/Q recorder for RTL2832 based USB-sticks\n\n"
"Usage:\t -f frequency to tune to [Hz]\n"
"\t[-s samplerate (default: 2048000 Hz)]\n"
"\toutput filename\n");
exit(1);
}
static void sighandler(int signum)
{
do_exit = 1;
}
int main(int argc, char **argv)
{
struct sigaction sigact;
int r, opt;
char *filename;
uint32_t frequency = 0, samp_rate = 2048000;
uint8_t buffer[READLEN];
int n_read;
FILE *file;
while ((opt = getopt(argc, argv, "f:s:")) != -1) {
switch (opt) {
case 'f':
frequency = atoi(optarg);
break;
case 's':
samp_rate = atoi(optarg);
break;
default:
usage();
break;
}
}
if (argc <= optind) {
usage();
} else {
filename = argv[optind];
}
r = libusb_init(NULL);
if (r < 0) {
fprintf(stderr, "Failed to initialize libusb\n");
exit(1);
}
r = find_device();
if (r < 0) {
fprintf(stderr, "Could not find/open device\n");
goto out;
}
r = libusb_claim_interface(devh, 0);
if (r < 0) {
fprintf(stderr, "usb_claim_interface error %d\n", r);
goto out;
}
sigact.sa_handler = sighandler;
sigemptyset(&sigact.sa_mask);
sigact.sa_flags = 0;
sigaction(SIGINT, &sigact, NULL);
sigaction(SIGTERM, &sigact, NULL);
sigaction(SIGQUIT, &sigact, NULL);
/* Initialize the RTL2832 */
rtl_init();
set_samp_rate(samp_rate);
/* Initialize tuner & set frequency */
tuner_init(frequency);
file = fopen(filename, "wb");
if (!file) {
printf("Failed to open %s\n", filename);
goto out;
}
/* reset endpoint before we start reading */
rtl_write_reg(USBB, USB_EPA_CTL, 0x1002, 2);
rtl_write_reg(USBB, USB_EPA_CTL, 0x0000, 2);
printf("Reading samples...\n");
while (!do_exit) {
libusb_bulk_transfer(devh, 0x81, buffer, READLEN, &n_read, 3000);
fwrite(buffer, n_read, 1, file);
if (n_read < READLEN) {
printf("Short bulk read, samples lost, exiting!\n");
break;
}
}
fclose(file);
libusb_release_interface(devh, 0);
out:
libusb_close(devh);
libusb_exit(NULL);
return r >= 0 ? r : -r;
}