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it works, may need some more testing but after calling and testing I'm able to read text from the microsoft customer support tty/tdd

This commit is contained in:
erratic 2015-01-24 21:48:41 +00:00
parent 7dfee8900b
commit d962b12ac2
1 changed files with 22 additions and 5 deletions
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27
src/minimodem.c
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@ -364,6 +364,7 @@ usage()
" 1200 Bell202 1200 bps --ascii\n"
" 300 Bell103 300 bps --ascii\n"
" rtty RTTY 45.45 bps --baudot --stopbits=1.5\n"
" tdd TTY/TDD 45.45 bps --baudot --startbits=1 --stopbits=1.5 -M 1400 -S 1800\n"
" same NOAA SAME 520.83 bps --sync-byte=0xAB ...\n"
" callerid Bell202 CID 1200 bps\n"
" uic{-train,-ground} UIC-751-3 Train/Ground 600 bps\n"
@ -788,11 +789,27 @@ main( int argc, char*argv[] )
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.
/*
* 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.
*
* Furthermore, there is a mark hold tone, which extends the
* length of time the stop bit is transmitted following the last
* character from 150 ms to 300 ms. The mark hold tone is not
* transmitted if the character is immediately followed by
* another character. The mark hold tone prevents the
* transmitting TTY device from receiving its echo and mistaking
* it for an incoming character. This mechanism is effective
* for wireline calls but may not be sufficient to mitigate
* echo in wireless scenarios because of the longer delays.
* Refer to the TTY specification for a solution to mitigating
* echo in wireless networks.
*
*/
bfsk_nstopbits = 1.5;
}
}