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librtlsdr.c
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librtlsdr.c
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#include <errno.h>
#include <signal.h>
#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include <libusb-1.0/libusb.h>
#ifndef _WIN32
#include <unistd.h>
#define min(a, b) (((a) < (b)) ? (a) : (b))
#endif
//#include <libusb.h>
/*
* All libusb callback functions should be marked with the LIBUSB_CALL macro
* to ensure that they are compiled with the same calling convention as libusb.
*
* If the macro isn't available in older libusb versions, we simply define it.
*/
#ifndef LIBUSB_CALL
#define LIBUSB_CALL
#endif
/* two raised to the power of n */
#define TWO_POW(n) ((double)(1ULL<<(n)))
#include "rtl-sdr.h"
#include "tuner_r820t.h"
typedef struct rtlsdr_tuner_iface {
/* tuner interface */
int (*init) (void *);
int (*exit) (void *);
int (*set_freq) (void *, uint32_t freq /* Hz */ );
int (*set_bw) (void *, int bw /* Hz */ );
int (*set_gain) (void *, int gain /* tenth dB */ );
int (*set_if_gain) (void *, int stage, int gain /* tenth dB */ );
int (*set_gain_mode) (void *, int manual);
} rtlsdr_tuner_iface_t;
enum rtlsdr_async_status {
RTLSDR_INACTIVE = 0,
RTLSDR_CANCELING,
RTLSDR_RUNNING
};
struct rtlsdr_dev {
libusb_context *ctx;
struct libusb_device_handle *devh;
uint32_t xfer_buf_num;
uint32_t xfer_buf_len;
struct libusb_transfer **xfer;
unsigned char **xfer_buf;
rtlsdr_read_async_cb_t cb;
void *cb_ctx;
enum rtlsdr_async_status async_status;
/* rtl demod context */
uint32_t rate; /* Hz */
uint32_t rtl_xtal; /* Hz */
int direct_sampling;
/* tuner context */
enum rtlsdr_tuner tuner_type;
rtlsdr_tuner_iface_t *tuner;
uint32_t tun_xtal; /* Hz */
uint32_t freq; /* Hz */
uint32_t offs_freq; /* Hz */
int corr; /* ppm */
int gain; /* tenth dB */
int dev_lost;
int driver_active;
unsigned int xfer_errors;
};
void rtlsdr_set_gpio_bit(rtlsdr_dev_t * dev, uint8_t gpio, int val);
/* generic tuner interface functions, shall be moved to the tuner implementations */
int r820t_init(void *dev)
{
int r = R828_Init(dev);
r820t_SetStandardMode(dev, DVB_T_6M);
return r;
}
int r820t_exit(void *dev)
{
return r820t_SetStandby(dev, 0);
}
int r820t_set_freq(void *dev, uint32_t freq)
{
return r820t_SetRfFreqHz(dev, freq);
}
// int r820t_set_bw(void *dev, int bw) { return 0; }
int r820t_set_gain(void *dev, int gain)
{
return R828_SetRfGain(dev, gain);
}
int r820t_set_gain_mode(void *dev, int manual)
{
return R828_RfGainMode(dev, manual);
}
/* definition order must match enum rtlsdr_tuner */
static rtlsdr_tuner_iface_t tuners[] = {
{
NULL, NULL, NULL, NULL, NULL, NULL, NULL /* dummy for unknown tuners */
},
{
r820t_init, r820t_exit,
// r820t_set_freq, r820t_set_bw, r820t_set_gain, NULL,
r820t_set_freq, NULL, r820t_set_gain, NULL,
r820t_set_gain_mode},
};
typedef struct rtlsdr_dongle {
uint16_t vid;
uint16_t pid;
const char *name;
} rtlsdr_dongle_t;
/*
* Please add your device here and send a patch to osmocom-sdr@lists.osmocom.org
*/
static rtlsdr_dongle_t known_devices[] = {
{0x0bda, 0x2832, "Generic RTL2832U"},
{0x0bda, 0x2838, "ezcap USB 2.0 DVB-T/DAB/FM dongle"},
{0x0ccd, 0x00a9, "Terratec Cinergy T Stick Black (rev 1)"},
{0x0ccd, 0x00b3, "Terratec NOXON DAB/DAB+ USB dongle (rev 1)"},
{0x0ccd, 0x00b4, "Terratec NOXON DAB/DAB+ USB dongle (rev 1)"},
{0x0ccd, 0x00b7, "Terratec NOXON DAB/DAB+ USB dongle (rev 1)"},
{0x0ccd, 0x00c6, "Terratec NOXON DAB/DAB+ USB dongle (rev 1)"},
{0x0ccd, 0x00d3, "Terratec Cinergy T Stick RC (Rev.3)"},
{0x0ccd, 0x00d7, "Terratec T Stick PLUS"},
{0x0ccd, 0x00e0, "Terratec NOXON DAB/DAB+ USB dongle (rev 2)"},
{0x1554, 0x5020, "PixelView PV-DT235U(RN)"},
{0x185b, 0x0620, "Compro Videomate U620F"},
{0x185b, 0x0650, "Compro Videomate U650F"},
{0x185b, 0x0680, "Compro Videomate U680F"},
{0x1f4d, 0xa803, "Sweex DVB-T USB"},
{0x1f4d, 0xb803, "GTek T803"},
{0x1f4d, 0xc803, "Lifeview LV5TDeluxe"},
{0x1f4d, 0xd286, "MyGica TD312"},
{0x1f4d, 0xd803, "PROlectrix DV107669"},
{0x1b80, 0xd398, "Zaapa ZT-MINDVBZP"},
{0x1b80, 0xd3a4, "Twintech UT-40"},
{0x1d19, 0x1101, "Dexatek DK DVB-T Dongle (Logilink VG0002A)"},
{0x1d19, 0x1102, "Dexatek DK DVB-T Dongle (MSI DigiVox mini II V3.0)"},
{0x1d19, 0x1103, "Dexatek Technology Ltd. DK 5217 DVB-T Dongle"},
{0x1d19, 0x1104, "MSI DigiVox Micro HD"},
{0x0413, 0x6f0f, "Leadtek WinFast DTV Dongle mini D"},
{0x0458, 0x707f, "Genius TVGo DVB-T03 USB dongle (Ver. B)"},
{0x1b80, 0xd393, "GIGABYTE GT-U7300"},
{0x1b80, 0xd394, "DIKOM USB-DVBT HD"},
{0x1b80, 0xd395, "Peak 102569AGPK"},
{0x1b80, 0xd39d, "SVEON STV20 DVB-T USB & FM"},
};
#define DEFAULT_BUF_NUMBER 32
#define DEFAULT_BUF_LENGTH (16 * 32 * 512)
#define DEF_RTL_XTAL_FREQ 28800000
#define MIN_RTL_XTAL_FREQ (DEF_RTL_XTAL_FREQ - 1000)
#define MAX_RTL_XTAL_FREQ (DEF_RTL_XTAL_FREQ + 1000)
#define MAX_SAMP_RATE 3200000
#define CTRL_IN (LIBUSB_REQUEST_TYPE_VENDOR | LIBUSB_ENDPOINT_IN)
#define CTRL_OUT (LIBUSB_REQUEST_TYPE_VENDOR | LIBUSB_ENDPOINT_OUT)
#define CTRL_TIMEOUT 300
#define BULK_TIMEOUT 0
#define EEPROM_ADDR 0xa0
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, CTRL_TIMEOUT);
#if 0
if (r < 0)
fprintf(stderr, "%s failed with %d\n", __FUNCTION__, r);
#endif
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, CTRL_TIMEOUT);
#if 0
if (r < 0)
fprintf(stderr, "%s failed with %d\n", __FUNCTION__, r);
#endif
return r;
}
int rtlsdr_i2c_write_reg(rtlsdr_dev_t * dev, uint8_t i2c_addr, uint8_t reg, uint8_t val)
{
uint16_t addr = i2c_addr;
uint8_t data[2];
data[0] = reg;
data[1] = val;
return rtlsdr_write_array(dev, IICB, addr, (uint8_t *) & data, 2);
}
uint8_t rtlsdr_i2c_read_reg(rtlsdr_dev_t * dev, uint8_t i2c_addr, uint8_t reg)
{
uint16_t addr = i2c_addr;
uint8_t data = 0;
rtlsdr_write_array(dev, IICB, addr, ®, 1);
rtlsdr_read_array(dev, IICB, addr, &data, 1);
return data;
}
int rtlsdr_i2c_write(rtlsdr_dev_t * dev, uint8_t i2c_addr, uint8_t * buffer, int len)
{
uint16_t addr = i2c_addr;
if (!dev)
return -1;
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;
if (!dev)
return -1;
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, CTRL_TIMEOUT);
if (r < 0)
fprintf(stderr, "%s failed with %d\n", __FUNCTION__, r);
reg = (data[1] << 8) | data[0];
return reg;
}
int 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, CTRL_TIMEOUT);
if (r < 0)
fprintf(stderr, "%s failed with %d\n", __FUNCTION__, r);
return r;
}
uint16_t rtlsdr_demod_read_reg(rtlsdr_dev_t * dev, uint8_t page, uint16_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, CTRL_TIMEOUT);
if (r < 0)
fprintf(stderr, "%s failed with %d\n", __FUNCTION__, r);
reg = (data[1] << 8) | data[0];
return reg;
}
int 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, CTRL_TIMEOUT);
if (r < 0)
fprintf(stderr, "%s failed with %d\n", __FUNCTION__, r);
rtlsdr_demod_read_reg(dev, 0x0a, 0x01, 1);
return (r == len) ? 0 : -1;
}
void rtlsdr_set_gpio_bit(rtlsdr_dev_t * dev, uint8_t gpio, int val)
{
uint8_t r;
gpio = 1 << gpio;
r = rtlsdr_read_reg(dev, SYSB, GPO, 1);
r = val ? (r | gpio) : (r & ~gpio);
rtlsdr_write_reg(dev, SYSB, GPO, r, 1);
}
void rtlsdr_set_gpio_output(rtlsdr_dev_t * dev, uint8_t gpio)
{
int r;
gpio = 1 << gpio;
r = rtlsdr_read_reg(dev, SYSB, GPD, 1);
rtlsdr_write_reg(dev, SYSB, GPO, r & ~gpio, 1);
r = rtlsdr_read_reg(dev, SYSB, GPOE, 1);
rtlsdr_write_reg(dev, SYSB, GPOE, r | gpio, 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, 0xa5,
};
/* 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);
/* clear both DDC shift and IF frequency registers */
for (i = 0; i < 6; i++)
rtlsdr_demod_write_reg(dev, 1, 0x16 + i, 0x00, 1);
/* set FIR coefficients */
for (i = 0; i < sizeof(fir_coeff); i++)
rtlsdr_demod_write_reg(dev, 1, 0x1c + i, fir_coeff[i], 1);
/* enable SDR mode, disable DAGC (bit 5) */
// rtlsdr_demod_write_reg(dev, 0, 0x19, 0x05, 1);
// changed as per Changing from 0x25 to 0xd5 here switches the AGC off SM5BSZ July2 2012
// didn't see any change AEER 13 Nov 13
rtlsdr_demod_write_reg(dev, 0, 0x19, 0xd5, 1);
/* init FSM state-holding register */
rtlsdr_demod_write_reg(dev, 1, 0x93, 0xf0, 1);
rtlsdr_demod_write_reg(dev, 1, 0x94, 0x0f, 1);
/* disable AGC (en_dagc, bit 0) (this seems to have no effect) */
rtlsdr_demod_write_reg(dev, 1, 0x11, 0x00, 1);
// test made no difference
/* disable RF and IF AGC */
// uint16_t tmp;
// tmp = rtlsdr_demod_read_reg(dev, 1, 0x04, 1);
// tmp &= ~0xc0;
// rtlsdr_demod_write_reg(dev, 1, 0x04, tmp, 1);
/* disable AGC PGA */
// rtlsdr_demod_write_reg(dev, 1, 0xd7, 0x00, 1);
/* disable GI PGA */
// rtlsdr_demod_write_reg(dev, 1, 0xe5, 0x00, 1);
// end of test
/* disable RF and IF AGC loop */
rtlsdr_demod_write_reg(dev, 1, 0x04, 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);
/* disable 4.096 MHz clock output on pin TP_CK0 */
rtlsdr_demod_write_reg(dev, 0, 0x0d, 0x83, 1);
}
int rtlsdr_deinit_baseband(rtlsdr_dev_t * dev)
{
int r = 0;
if (!dev)
return -1;
if (dev->tuner && dev->tuner->exit) {
rtlsdr_set_i2c_repeater(dev, 1);
r = dev->tuner->exit(dev); /* deinitialize tuner */
rtlsdr_set_i2c_repeater(dev, 0);
}
/* poweroff demodulator and ADCs */
rtlsdr_write_reg(dev, SYSB, DEMOD_CTL, 0x20, 1);
return r;
}
int rtlsdr_set_if_freq(rtlsdr_dev_t * dev, uint32_t freq)
{
uint32_t rtl_xtal;
int32_t if_freq;
uint8_t tmp;
int r;
if (!dev)
return -1;
/* read corrected clock value */
if (rtlsdr_get_xtal_freq(dev, &rtl_xtal, NULL))
return -2;
if_freq = ((freq * TWO_POW(22)) / rtl_xtal) * (-1);
tmp = (if_freq >> 16) & 0x3f;
r = rtlsdr_demod_write_reg(dev, 1, 0x19, tmp, 1);
tmp = (if_freq >> 8) & 0xff;
r |= rtlsdr_demod_write_reg(dev, 1, 0x1a, tmp, 1);
tmp = if_freq & 0xff;
r |= rtlsdr_demod_write_reg(dev, 1, 0x1b, tmp, 1);
return r;
}
int rtlsdr_set_sample_freq_correction(rtlsdr_dev_t * dev, int ppm)
{
int r = 0;
uint8_t tmp;
int16_t offs = ppm * (-1) * TWO_POW(24) / 1000000;
tmp = offs & 0xff;
r |= rtlsdr_demod_write_reg(dev, 1, 0x3f, tmp, 1);
tmp = (offs >> 8) & 0x3f;
r |= rtlsdr_demod_write_reg(dev, 1, 0x3e, tmp, 1);
return r;
}
int rtlsdr_set_xtal_freq(rtlsdr_dev_t * dev, uint32_t rtl_freq, uint32_t tuner_freq)
{
int r = 0;
if (!dev)
return -1;
if (rtl_freq > 0 && (rtl_freq < MIN_RTL_XTAL_FREQ || rtl_freq > MAX_RTL_XTAL_FREQ))
return -2;
if (rtl_freq > 0 && dev->rtl_xtal != rtl_freq) {
dev->rtl_xtal = rtl_freq;
/* update xtal-dependent settings */
if (dev->rate)
r = rtlsdr_set_sample_rate(dev, dev->rate);
}
if (dev->tun_xtal != tuner_freq) {
if (0 == tuner_freq)
dev->tun_xtal = dev->rtl_xtal;
else
dev->tun_xtal = tuner_freq;
/* update xtal-dependent settings */
if (dev->freq)
r = rtlsdr_set_center_freq(dev, dev->freq);
}
return r;
}
int rtlsdr_get_xtal_freq(rtlsdr_dev_t * dev, uint32_t * rtl_freq, uint32_t * tuner_freq)
{
if (!dev)
return -1;
#define APPLY_PPM_CORR(val,ppm) (((val) * (1.0 + (ppm) / 1e6)))
if (rtl_freq)
*rtl_freq = (uint32_t) APPLY_PPM_CORR(dev->rtl_xtal, dev->corr);
if (tuner_freq)
*tuner_freq = (uint32_t) APPLY_PPM_CORR(dev->tun_xtal, dev->corr);
return 0;
}
int rtlsdr_get_usb_strings(rtlsdr_dev_t * dev, char *manufact, char *product, char *serial)
{
struct libusb_device_descriptor dd;
libusb_device *device = NULL;
const int buf_max = 256;
int r = 0;
if (!dev || !dev->devh)
return -1;
device = libusb_get_device(dev->devh);
r = libusb_get_device_descriptor(device, &dd);
if (r < 0)
return -1;
if (manufact) {
memset(manufact, 0, buf_max);
libusb_get_string_descriptor_ascii(dev->devh, dd.iManufacturer, (unsigned char *) manufact, buf_max);
}
if (product) {
memset(product, 0, buf_max);
libusb_get_string_descriptor_ascii(dev->devh, dd.iProduct, (unsigned char *) product, buf_max);
}
if (serial) {
memset(serial, 0, buf_max);
libusb_get_string_descriptor_ascii(dev->devh, dd.iSerialNumber, (unsigned char *) serial, buf_max);
}
return 0;
}
int rtlsdr_write_eeprom(rtlsdr_dev_t * dev, uint8_t * data, uint8_t offset, uint16_t len)
{
int r = 0;
int i;
uint8_t cmd[2];
if (!dev)
return -1;
if ((len + offset) > 256)
return -2;
for (i = 0; i < len; i++) {
cmd[0] = i + offset;
r = rtlsdr_write_array(dev, IICB, EEPROM_ADDR, cmd, 1);
r = rtlsdr_read_array(dev, IICB, EEPROM_ADDR, &cmd[1], 1);
/* only write the byte if it differs */
if (cmd[1] == data[i])
continue;
cmd[1] = data[i];
r = rtlsdr_write_array(dev, IICB, EEPROM_ADDR, cmd, 2);
if (r != sizeof(cmd))
return -3;
/* for some EEPROMs (e.g. ATC 240LC02) we need a delay
* between write operations, otherwise they will fail */
#ifdef _WIN32
Sleep(5);
#else
usleep(5000);
#endif
}
return 0;
}
int rtlsdr_read_eeprom(rtlsdr_dev_t * dev, uint8_t * data, uint8_t offset, uint16_t len)
{
int r = 0;
int i;
if (!dev)
return -1;
if ((len + offset) > 256)
return -2;
r = rtlsdr_write_array(dev, IICB, EEPROM_ADDR, &offset, 1);
if (r < 0)
return -3;
for (i = 0; i < len; i++) {
r = rtlsdr_read_array(dev, IICB, EEPROM_ADDR, data + i, 1);
if (r < 0)
return -3;
}
return r;
}
int rtlsdr_set_center_freq(rtlsdr_dev_t * dev, uint32_t freq)
{
int r = -1;
if (!dev || !dev->tuner)
return -1;
if (dev->direct_sampling) {
r = rtlsdr_set_if_freq(dev, freq);
} else if (dev->tuner && dev->tuner->set_freq) {
rtlsdr_set_i2c_repeater(dev, 1);
r = dev->tuner->set_freq(dev, freq - dev->offs_freq);
rtlsdr_set_i2c_repeater(dev, 0);
}
if (!r)
dev->freq = freq;
else
dev->freq = 0;
return r;
}
uint32_t rtlsdr_get_center_freq(rtlsdr_dev_t * dev)
{
if (!dev)
return 0;
return dev->freq;
}
int rtlsdr_set_freq_correction(rtlsdr_dev_t * dev, int ppm)
{
int r = 0;
if (!dev)
return -1;
if (dev->corr == ppm)
return -2;
dev->corr = ppm;
r |= rtlsdr_set_sample_freq_correction(dev, ppm);
if (dev->freq) /* retune to apply new correction value */
r |= rtlsdr_set_center_freq(dev, dev->freq);
return r;
}
int rtlsdr_get_freq_correction(rtlsdr_dev_t * dev)
{
if (!dev)
return 0;
return dev->corr;
}
enum rtlsdr_tuner rtlsdr_get_tuner_type(rtlsdr_dev_t * dev)
{
if (!dev)
return RTLSDR_TUNER_UNKNOWN;
return dev->tuner_type;
}
int rtlsdr_get_tuner_gains(rtlsdr_dev_t * dev, int *gains)
{
/* all gain values are expressed in tenths of a dB */
const int r820t_gains[] = { 0, 9, 14, 27, 37, 77, 87, 125, 144, 157,
166, 197, 207, 229, 254, 280, 297, 328,
338, 364, 372, 386, 402, 421, 434, 439,
445, 480, 496
};
const int unknown_gains[] = { 0 /* no gain values */ };
const int *ptr = NULL;
int len = 0;
if (!dev)
return -1;
switch (dev->tuner_type) {
case RTLSDR_TUNER_R820T:
ptr = r820t_gains;
len = sizeof(r820t_gains);
break;
default:
ptr = unknown_gains;
len = sizeof(unknown_gains);
break;
}
if (!gains) { /* no buffer provided, just return the count */
return len / sizeof(int);
} else {
if (len)
memcpy(gains, ptr, len);
return len / sizeof(int);
}
}
int rtlsdr_set_tuner_gain(rtlsdr_dev_t * dev, int gain)
{
int r = 0;
if (!dev || !dev->tuner)
return -1;
if (dev->tuner->set_gain) {
rtlsdr_set_i2c_repeater(dev, 1);
r = dev->tuner->set_gain((void *) dev, gain);
rtlsdr_set_i2c_repeater(dev, 0);
}
if (!r)
dev->gain = gain;
else
dev->gain = 0;
return r;
}
int rtlsdr_get_tuner_gain(rtlsdr_dev_t * dev)
{
if (!dev)
return 0;
return dev->gain;
}
int rtlsdr_set_tuner_if_gain(rtlsdr_dev_t * dev, int stage, int gain)
{
int r = 0;
if (!dev || !dev->tuner)
return -1;
if (dev->tuner->set_if_gain) {
rtlsdr_set_i2c_repeater(dev, 1);
r = dev->tuner->set_if_gain(dev, stage, gain);
rtlsdr_set_i2c_repeater(dev, 0);
}
return r;
}
int rtlsdr_set_tuner_gain_mode(rtlsdr_dev_t * dev, int mode)
{
int r = 0;
if (!dev || !dev->tuner)
return -1;
if (dev->tuner->set_gain_mode) {
rtlsdr_set_i2c_repeater(dev, 1);
r = dev->tuner->set_gain_mode((void *) dev, mode);
rtlsdr_set_i2c_repeater(dev, 0);
}
return r;
}
int rtlsdr_set_sample_rate(rtlsdr_dev_t * dev, uint32_t samp_rate)
{
int r = 0;
uint16_t tmp;
uint32_t rsamp_ratio;
double real_rate;
if (!dev)
return -1;
/* check for the maximum rate the resampler supports */
if (samp_rate > MAX_SAMP_RATE)
samp_rate = MAX_SAMP_RATE;
rsamp_ratio = (dev->rtl_xtal * TWO_POW(22)) / samp_rate;
rsamp_ratio &= ~3;
real_rate = (dev->rtl_xtal * TWO_POW(22)) / rsamp_ratio;
if (((double) samp_rate) != real_rate)
fprintf(stderr, "Exact sample rate is: %f Hz\n", real_rate);
if (dev->tuner && dev->tuner->set_bw) {
rtlsdr_set_i2c_repeater(dev, 1);
dev->tuner->set_bw(dev, (int) real_rate);
rtlsdr_set_i2c_repeater(dev, 0);
}
dev->rate = (uint32_t) real_rate;
tmp = (rsamp_ratio >> 16);
r |= rtlsdr_demod_write_reg(dev, 1, 0x9f, tmp, 2);
tmp = rsamp_ratio & 0xffff;
r |= rtlsdr_demod_write_reg(dev, 1, 0xa1, tmp, 2);
r |= rtlsdr_set_sample_freq_correction(dev, dev->corr);
/* reset demod (bit 3, soft_rst) */
r |= rtlsdr_demod_write_reg(dev, 1, 0x01, 0x14, 1);
r |= rtlsdr_demod_write_reg(dev, 1, 0x01, 0x10, 1);
/* recalculate offset frequency if offset tuning is enabled */
if (dev->offs_freq)
rtlsdr_set_offset_tuning(dev, 1);
return r;
}
uint32_t rtlsdr_get_sample_rate(rtlsdr_dev_t * dev)
{
if (!dev)
return 0;
return dev->rate;
}
int rtlsdr_set_testmode(rtlsdr_dev_t * dev, int on)
{
if (!dev)
return -1;
return rtlsdr_demod_write_reg(dev, 0, 0x19, on ? 0x03 : 0x05, 1);
}
int rtlsdr_set_agc_mode(rtlsdr_dev_t * dev, int on)
{
if (!dev)
return -1;
return rtlsdr_demod_write_reg(dev, 0, 0x19, on ? 0x25 : 0x05, 1);
}
int rtlsdr_set_direct_sampling(rtlsdr_dev_t * dev, int on)
{
int r = 0;
if (!dev)
return -1;
if (on) {
if (dev->tuner && dev->tuner->exit) {
rtlsdr_set_i2c_repeater(dev, 1);
r = dev->tuner->exit(dev);
rtlsdr_set_i2c_repeater(dev, 0);
}
/* disable Zero-IF mode */
r |= rtlsdr_demod_write_reg(dev, 1, 0xb1, 0x1a, 1);
/* disable spectrum inversion */
r |= rtlsdr_demod_write_reg(dev, 1, 0x15, 0x00, 1);
/* only enable In-phase ADC input */
r |= rtlsdr_demod_write_reg(dev, 0, 0x08, 0x4d, 1);
/* swap I and Q ADC, this allows to select between two inputs */
r |= rtlsdr_demod_write_reg(dev, 0, 0x06, (on > 1) ? 0x90 : 0x80, 1);
fprintf(stderr, "Enabled direct sampling mode, input %i\n", on);
dev->direct_sampling = on;
} else {
if (dev->tuner && dev->tuner->init) {
rtlsdr_set_i2c_repeater(dev, 1);
r |= dev->tuner->init(dev);
rtlsdr_set_i2c_repeater(dev, 0);
}
if (dev->tuner_type == RTLSDR_TUNER_R820T) {
r |= rtlsdr_set_if_freq(dev, R820T_IF_FREQ);
/* enable spectrum inversion */
r |= rtlsdr_demod_write_reg(dev, 1, 0x15, 0x01, 1);
} else {
r |= rtlsdr_set_if_freq(dev, 0);
/* enable In-phase + Quadrature ADC input */
r |= rtlsdr_demod_write_reg(dev, 0, 0x08, 0xcd, 1);
/* Enable Zero-IF mode */
r |= rtlsdr_demod_write_reg(dev, 1, 0xb1, 0x1b, 1);
}
/* opt_adc_iq = 0, default ADC_I/ADC_Q datapath */
r |= rtlsdr_demod_write_reg(dev, 0, 0x06, 0x80, 1);
fprintf(stderr, "Disabled direct sampling mode\n");
dev->direct_sampling = 0;
}
r |= rtlsdr_set_center_freq(dev, dev->freq);
return r;
}
int rtlsdr_get_direct_sampling(rtlsdr_dev_t * dev)
{
if (!dev)
return -1;
return dev->direct_sampling;
}
int rtlsdr_set_offset_tuning(rtlsdr_dev_t * dev, int on)
{
int r = 0;
if (!dev)
return -1;
if (dev->tuner_type == RTLSDR_TUNER_R820T)
return -2;
if (dev->direct_sampling)
return -3;
/* based on keenerds 1/f noise measurements */
dev->offs_freq = on ? ((dev->rate / 2) * 170 / 100) : 0;
r |= rtlsdr_set_if_freq(dev, dev->offs_freq);
if (dev->tuner && dev->tuner->set_bw) {
rtlsdr_set_i2c_repeater(dev, 1);
dev->tuner->set_bw(dev, on ? (2 * dev->offs_freq) : dev->rate);
rtlsdr_set_i2c_repeater(dev, 0);
}