diff options
author | Dimitri Stolnikov <horiz0n@gmx.net> | 2012-05-25 20:45:47 +0200 |
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committer | Dimitri Stolnikov <horiz0n@gmx.net> | 2012-05-25 20:45:47 +0200 |
commit | b5beddca4f3ac5f7614d3fea3e1516336e1f4951 (patch) | |
tree | b0e6683b48a74d65253bc826a13092d905adcc12 /src/rtl_sdr.c | |
parent | 6d34b04b422192550716233df5b6e479f5c1f268 (diff) |
fix gain setting and update usage information for CLI tools
Diffstat (limited to 'src/rtl_sdr.c')
-rw-r--r-- | src/rtl_sdr.c | 44 |
1 files changed, 28 insertions, 16 deletions
diff --git a/src/rtl_sdr.c b/src/rtl_sdr.c index 45995c2..5cc999d 100644 --- a/src/rtl_sdr.c +++ b/src/rtl_sdr.c @@ -42,16 +42,16 @@ static rtlsdr_dev_t *dev = NULL; void usage(void) { #ifdef _WIN32 - fprintf(stderr,"rtl-sdr, an I/Q recorder for RTL2832 based USB-sticks\n\n" - "Usage:\t rtl-sdr-win.exe [device_index] [samplerate in kHz] " - "[gain] [frequency in Hz] [filename]\n"); + fprintf(stderr,"rtl_sdr, an I/Q recorder for RTL2832 based DVB-T receivers\n\n" + "Usage:\t rtl_sdr.exe [device_index] [samplerate in kHz] " + "[gain (0 for auto)] [frequency in Hz] [filename]\n"); #else fprintf(stderr, - "rtl-sdr, an I/Q recorder for RTL2832 based DVB-T receivers\n\n" + "rtl_sdr, an I/Q recorder for RTL2832 based DVB-T receivers\n\n" "Usage:\t -f frequency_to_tune_to [Hz]\n" "\t[-s samplerate (default: 2048000 Hz)]\n" "\t[-d device_index (default: 0)]\n" - "\t[-g tuner_gain (default: -1dB)]\n" + "\t[-g gain (default: 0 for auto)]\n" "\t[-b output_block_size (default: 16 * 16384)]\n" "\t[-S force sync output (default: async)]\n" "\tfilename (a '-' dumps samples to stdout)\n\n"); @@ -98,7 +98,7 @@ int main(int argc, char **argv) char *filename = NULL; int n_read; int r, opt; - int i, gain = -10; // tenths of a dB + int i, gain = 0; int sync_mode = 0; FILE *file; uint8_t *buffer; @@ -118,7 +118,7 @@ int main(int argc, char **argv) frequency = (uint32_t)atof(optarg); break; case 'g': - gain = (int)(atof(optarg) * 10); + gain = (int)(atof(optarg) * 10); /* tenths of a dB */ break; case 's': samp_rate = (uint32_t)atof(optarg); @@ -141,11 +141,11 @@ int main(int argc, char **argv) filename = argv[optind]; } #else - if(argc <6) + if(argc < 6) usage(); dev_index = atoi(argv[1]); - samp_rate = atoi(argv[2])*1000; - gain=(int)(atof(argv[3]) * 10); + samp_rate = atoi(argv[2])*1000; /* kHz */ + gain = (int)(atof(argv[3]) * 10); /* tenths of a dB */ frequency = atoi(argv[4]); filename = argv[5]; #endif @@ -206,12 +206,24 @@ int main(int argc, char **argv) else fprintf(stderr, "Tuned to %u Hz.\n", frequency); - /* Set the tuner gain */ - r = rtlsdr_set_tuner_gain(dev, gain); - if (r < 0) - fprintf(stderr, "WARNING: Failed to set tuner gain.\n"); - else - fprintf(stderr, "Tuner gain set to %f dB.\n", gain/10.0); + if (0 == gain) { + /* Enable automatic gain */ + r = rtlsdr_set_tuner_gain_mode(dev, 0); + if (r < 0) + fprintf(stderr, "WARNING: Failed to enable automatic gain.\n"); + } else { + /* Enable manual gain */ + r = rtlsdr_set_tuner_gain_mode(dev, 1); + if (r < 0) + fprintf(stderr, "WARNING: Failed to enable manual gain.\n"); + + /* Set the tuner gain */ + r = rtlsdr_set_tuner_gain(dev, gain); + if (r < 0) + fprintf(stderr, "WARNING: Failed to set tuner gain.\n"); + else + fprintf(stderr, "Tuner gain set to %f dB.\n", gain/10.0); + } if(strcmp(filename, "-") == 0) { /* Write samples to stdout */ file = stdout; |