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librtlsdr
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check for integer samplrate/modem_samplerate

development
David 2020-09-19 12:51:44 +09:30
parent b3549df70d
commit 4e85c4d1d0
1 changed files with 11 additions and 2 deletions
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13
src/rtl_fsk.c
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@ -104,6 +104,7 @@ void usage(void)
fprintf(stderr, fprintf(stderr,
"rtl_fsk, a FSK demodulator for RTL2832 based DVB-T receivers\n\n" "rtl_fsk, a FSK demodulator for RTL2832 based DVB-T receivers\n\n"
"Usage:\t -f frequency_to_tune_to [Hz]\n" "Usage:\t -f frequency_to_tune_to [Hz]\n"
"\t[-a modem_samplerate (default: %d Hz)]\n"
"\t[-s samplerate (default: %d Hz)]\n" "\t[-s samplerate (default: %d Hz)]\n"
"\t[-d device_index (default: 0)]\n" "\t[-d device_index (default: 0)]\n"
"\t[-e extended gain -e 0xlmi (l,m,i single hex digits 0-f)\n" "\t[-e extended gain -e 0xlmi (l,m,i single hex digits 0-f)\n"
@ -119,7 +120,7 @@ void usage(void)
"\t[-u hostname (optional hostname:8001 where we send UDP dashboard diagnostics)\n" "\t[-u hostname (optional hostname:8001 where we send UDP dashboard diagnostics)\n"
"\t[-x output complex float samples (default output demodulated oneCharPerBit)]\n" "\t[-x output complex float samples (default output demodulated oneCharPerBit)]\n"
"\t[-t toneSpacing use 'mask' freq est]\n" "\t[-t toneSpacing use 'mask' freq est]\n"
"\tfilename (a '-' dumps bits to stdout)\n\n", DEFAULT_SAMPLE_RATE, DEFAULT_SYMBOL_RATE, DEFAULT_M); "\tfilename (a '-' dumps bits to stdout)\n\n", DEFAULT_MODEM_SAMPLE_RATE, DEFAULT_SAMPLE_RATE, DEFAULT_SYMBOL_RATE, DEFAULT_M);
exit(1); exit(1);
} }
@ -395,8 +396,11 @@ int main(int argc, char **argv)
int ext_gain = 0; int ext_gain = 0;
int gains_hex, lna_gain, mixer_gain, vga_gain; int gains_hex, lna_gain, mixer_gain, vga_gain;
while ((opt = getopt(argc, argv, "d:e:f:g:s:b:n:p:S:u:r:m:c:M:R:xt:w:")) != -1) { while ((opt = getopt(argc, argv, "a:d:e:f:g:s:b:n:p:S:u:r:m:c:M:R:xt:w:")) != -1) {
switch (opt) { switch (opt) {
case 'a':
modem_samp_rate = (uint32_t)atofs(optarg);
break;
case 'd': case 'd':
dev_index = verbose_device_search(optarg); dev_index = verbose_device_search(optarg);
dev_given = 1; dev_given = 1;
@ -584,6 +588,11 @@ int main(int argc, char **argv)
float transition_bw = 0.05; float transition_bw = 0.05;
window_t window = WINDOW_DEFAULT; window_t window = WINDOW_DEFAULT;
if (samp_rate % modem_samp_rate) {
fprintf(stderr, "ERROR: samplerate/modem_samplerate = %d/%d must be an integer\n",
samp_rate, modem_samp_rate);
exit(1);
}
csdr_factor = samp_rate/modem_samp_rate; csdr_factor = samp_rate/modem_samp_rate;
csdr_taps = csdr_init_decimate_cc(csdr_factor, transition_bw, window, &csdr_padded_taps_length); csdr_taps = csdr_init_decimate_cc(csdr_factor, transition_bw, window, &csdr_padded_taps_length);
assert(CSDR_BUFSIZE > padded_taps_length); assert(CSDR_BUFSIZE > padded_taps_length);