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working on adding tty/tdd support

This commit is contained in:
erratic 2015-01-24 21:25:41 +00:00
parent bf097873c0
commit 7dfee8900b
1 changed files with 35 additions and 2 deletions
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37
src/minimodem.c
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@ -497,7 +497,7 @@ main( int argc, char*argv[] )
int c;
int option_index;
enum {
MINIMODEM_OPT_UNUSED=256, // placeholder
MINIMODEM_OPT_MSBFIRST,
@ -763,7 +763,40 @@ main( int argc, char*argv[] )
bfsk_nstopbits = 0;
expect_data_string = "11110010ddddddddddddddddddddddddddddddddddddddd";
expect_n_bits = 47;
} else {
}
else if( strncasecmp(modem_mode, "tdd", 3) == 0 ) {
// 3GPP spec / documentation on TTY/TDD
//https://github.com/paigeadele/nBaudot/raw/master/C.S0028-A_v1.0_121503.pdf
if(bfsk_data_rate == 0)
bfsk_data_rate = 45.45;
if(bfsk_mark_f == 0)
bfsk_mark_f = 1400;
if(bfsk_space_f == 0)
bfsk_space_f = 1800;
if( bfsk_nstartbits == 0 )
bfsk_nstartbits = 1;
bfsk_databits_decode = databits_decode_baudot;
bfsk_databits_encode = databits_encode_baudot;
if ( bfsk_n_data_bits == 0 )
bfsk_n_data_bits = 5;
if ( bfsk_nstopbits < 0 )
{
//TODO I read somewhere that TTY/TDD called for 1 and a half stop
//bits but I think its possible that was wrong, based on the
//documentation above which says that it is 1-2 stop bits,
//the examples later in the documentation I mentioned above seems
//to indicate 2 as well.
bfsk_nstopbits = 1.5;
}
}
else {
bfsk_data_rate = atof(modem_mode);
if ( bfsk_n_data_bits == 0 )
bfsk_n_data_bits = 8;