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minimodem: fix --tx startbits/stopbits handling 

Make --tx support specified --startbits and --stopbits; also enables --tx SAME.

Thanks to Jamie Batmanglidj for reporting the issue.
This commit is contained in:
Kamal Mostafa 2012-11-01 12:48:40 -07:00
parent 83f8c7cbdd
commit 6ad778ce03
1 changed files with 8 additions and 3 deletions
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11
src/minimodem.c
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@ -79,6 +79,7 @@ static void fsk_transmit_stdin(
float bfsk_mark_f,
float bfsk_space_f,
int n_data_bits,
float bfsk_nstartbits,
float bfsk_nstopbits,
databits_encoder encode
)
@ -120,15 +121,18 @@ static void fsk_transmit_stdin(
}
unsigned int j;
for ( j=0; j<nwords; j++ ) {
simpleaudio_tone(sa_out, bfsk_space_f, bit_nsamples); // start
if ( bfsk_nstartbits > 0 )
simpleaudio_tone(sa_out, bfsk_space_f,
bit_nsamples * bfsk_nstartbits); // start
int i;
for ( i=0; i<n_data_bits; i++ ) { // data
unsigned int bit = ( bits[j] >> i ) & 1;
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 * bfsk_nstopbits); // stop
if ( bfsk_nstopbits > 0 )
simpleaudio_tone(sa_out, bfsk_mark_f,
bit_nsamples * bfsk_nstopbits); // stop
}
if ( tx_interactive )
@ -724,6 +728,7 @@ main( int argc, char*argv[] )
bfsk_data_rate,
bfsk_mark_f, bfsk_space_f,
bfsk_n_data_bits,
bfsk_nstartbits,
bfsk_nstopbits,
bfsk_databits_encode
);