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librtlsdr
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trapping sample rate/Rs conflicts

development
David 2020-10-25 10:30:14 +10:30
parent ebef4a2818
commit a51cee492c
1 changed files with 11 additions and 3 deletions
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14
src/rtl_fsk.c
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@ -116,7 +116,7 @@ void usage(void)
fprintf(stderr,
"rtl_fsk, a FSK demodulator for RTL2832 based DVB-T receivers\n\n"
"Usage:\t -f frequency_to_tune_to [Hz]\n"
"\t[-a modem_samplerate (default: %d Hz)]\n"
"\t[-a FSK modem sample rate (default: %d Hz)]\n"
"\t[-s samplerate (default: %d Hz)]\n"
"\t[-d device_index (default: 0)]\n"
"\t[-e extended gain -e 0xlmi (l,m,i single hex digits 0-f)\n"
@ -134,7 +134,7 @@ void usage(void)
"\t[--code CodeName Use LDPC code CodeName] (note packed bytes out)\n"
"\t[--listcodes List available LDPC codes]\n"
"\t[--testframes] built in testframe mode\n"
"\tfilename (a '-' dumps bits to stdout)\n\n", DEFAULT_MODEM_SAMPLE_RATE, DEFAULT_SAMPLE_RATE, DEFAULT_SYMBOL_RATE, DEFAULT_M);
"\tfilename ( '-' dumps bits to stdout)\n\n", DEFAULT_MODEM_SAMPLE_RATE, DEFAULT_SAMPLE_RATE, DEFAULT_SYMBOL_RATE, DEFAULT_M);
exit(1);
}
@ -665,7 +665,15 @@ int main(int argc, char **argv)
}
/* Setup the FSK demod -------------------------------------------------*/
if (modem_samp_rate % Rs) {
fprintf(stderr, "Error: (modem sample rate) / (modem symbol rate) must be an integer\n");
exit(1);
}
if ((modem_samp_rate / Rs) < 8) {
fprintf(stderr, "Error: (modem sample rate) / (modem symbol rate) must be >= 8\n");
exit(1);
}
if (fsk_ldpc == 0) {
/* uncoded mode: just set up FSK demod by itself */
int P = modem_samp_rate/Rs;