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minimodem --txstopbits M.N variable stop bits

This commit is contained in:
Kamal Mostafa 2011-06-22 13:43:24 -07:00
parent 1b764faa5b
commit 27bc5f5ca7
1 changed files with 15 additions and 2 deletions
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17
src/minimodem.c
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@ -77,6 +77,7 @@ static void fsk_transmit_stdin(
float bfsk_mark_f,
float bfsk_space_f,
int n_data_bits,
float bfsk_txstopbits,
int (*framebits_encoder)( unsigned int *databits_outp, char char_out )
)
{
@ -102,7 +103,8 @@ static void fsk_transmit_stdin(
float tone_freq = bit == 1 ? bfsk_mark_f : bfsk_space_f;
simpleaudio_tone(sa_out, tone_freq, bit_nsamples);
}
simpleaudio_tone(sa_out, bfsk_mark_f, bit_nsamples); // stop
simpleaudio_tone(sa_out, bfsk_mark_f,
bit_nsamples * bfsk_txstopbits); // stop
}
}
simpleaudio_tone(sa_out, bfsk_mark_f, bit_nsamples); // 2.0 bit tail
@ -150,6 +152,7 @@ usage()
" -b, --bandwidth {rx_bandwidth}\n"
" -M, --mark {mark_freq}\n"
" -S, --space {space_freq}\n"
" -T, --txstopbits {m.n}\n"
" {baudmode}\n"
" 1200 : Bell202 1200 bps --ascii\n"
" 300 : Bell103 300 bps --ascii (auto-rx-carrier)\n"
@ -168,6 +171,7 @@ main( int argc, char*argv[] )
float band_width = 0;
unsigned int bfsk_mark_f = 0;
unsigned int bfsk_space_f = 0;
float bfsk_txstopbits = 0;
unsigned int bfsk_n_data_bits = 0;
unsigned int autodetect_shift;
char *filename = NULL;
@ -196,9 +200,10 @@ main( int argc, char*argv[] )
{ "bandwidth", 1, 0, 'b' },
{ "mark", 1, 0, 'M' },
{ "space", 1, 0, 'S' },
{ "txstopbits", 1, 0, 'T' },
{ 0 }
};
c = getopt_long(argc, argv, "tr85f:b:M:S:",
c = getopt_long(argc, argv, "tr85f:b:M:S:T:",
long_options, &option_index);
if ( c == -1 )
break;
@ -234,6 +239,10 @@ main( int argc, char*argv[] )
bfsk_space_f = atoi(optarg);
assert( bfsk_space_f > 0 );
break;
case 'T':
bfsk_txstopbits = atof(optarg);
assert( bfsk_txstopbits > 0 );
break;
default:
usage();
}
@ -324,6 +333,9 @@ main( int argc, char*argv[] )
}
}
if ( bfsk_txstopbits == 0 )
bfsk_txstopbits = 1.0;
/* restrict band_width to <= data rate (FIXME?) */
if ( band_width > bfsk_data_rate )
band_width = bfsk_data_rate;
@ -351,6 +363,7 @@ main( int argc, char*argv[] )
bfsk_data_rate,
bfsk_mark_f, bfsk_space_f,
bfsk_n_data_bits,
bfsk_txstopbits,
bfsk_framebits_encode
);
return 0;