diff options
| -rw-r--r-- | gascop.c | 49 |
1 files changed, 46 insertions, 3 deletions
@@ -34,6 +34,7 @@ #include <string.h> #include <stdlib.h> #include <pthread.h> +#include <errno.h> #include "rtl-sdr.h" /* POCSAG parameters */ @@ -48,6 +49,9 @@ #define POCSAG_MAXWORD 16 #define POCSAG_MSG_LEN 256 +#define POCSAG_DEFAULT_RATE 2000000 +#define POCSAG_DEFAULT_WIDTH 1000 +#define POCSAG_DEFAULT_HEIGHT 700 #define POCSAG_ASYNC_BUF_NUMBER 12 #define POCSAG_DATA_LEN (16*16384) /* 256K */ #define POCSAG_AUTO_GAIN -100 /* Use automatic gain. */ @@ -149,6 +153,37 @@ uint32_t bchFix(uint32_t data, int poly, int n, int k) { return data; } +void rtlsdrInit(void) { + int device_count = rtlsdr_get_device_count(); + if (!device_count) { + fprintf(stderr, "No rtlsdr devices found.\n"); + exit(1); + } + + printf("Found %d device(s):\n", device_count); + char vendor[256], product[256], serial[256]; + int j; + for (j = 0; j < device_count; j++) { + rtlsdr_get_device_usb_strings(j, vendor, product, serial); + fprintf(stderr, "%d: %s, %s, SN: %s %s\n", j, vendor, product, serial, + (j == Gascop.dev_index) ? "(currently selected)" : ""); + } + + if (rtlsdr_open(&Gascop.dev, Gascop.dev_index) < 0) { + fprintf(stderr, "Error opening rtlsdr device: %s\n", strerror(errno)); + exit(1); + } + + rtlsdr_set_tuner_gain_mode(Gascop.dev, 0); /* auto gain */ + rtlsdr_set_freq_correction(Gascop.dev, 0); + rtlsdr_set_agc_mode(Gascop.dev, 1); + rtlsdr_set_center_freq(Gascop.dev, Gascop.freq); + rtlsdr_set_sample_rate(Gascop.dev, POCSAG_DEFAULT_RATE); + rtlsdr_reset_buffer(Gascop.dev); + fprintf(stderr, "Gain reported by device: %.2f\n", + rtlsdr_get_tuner_gain(Gascop.dev) / 10.0); +} + void rtlsdrCallback(unsigned char *buf, uint32_t len, void *ctx) { IGNORE(ctx); @@ -168,10 +203,18 @@ void *readerThreadEntryPoint(void *arg) { return NULL; } +void printUsage() { + printf("Usage: ./gascop [options] <frequency Hz>\n\n"); +} + int main(int argc, char **argv) { - IGNORE(argc); - IGNORE(argv); + if (argc < 2 || !strcmp(argv[1], "--help")) { + printUsage(); + exit(-1); + } + + Gascop.freq = strtoll(argv[1], NULL, 10); - printf("Gascop...\n"); + rtlsdrInit(); exit(0); } |