Hi all,
I have just realized a DTMF software decoder in C that works on Linux and
grabs its input via soundcard. I want to utilize it to develop a vocal
radio BBS activable via DTMF tones so i need to pilot my transciver to let
it start/stop trasmitting. I have already a soundmodem for packet that do
this work via serial port, so I have watched soundmodem sources to
understand how it is possible to set/unset signal lines of a serial port
under linux (i have not much experience about this programming task). I
think that right way is to use "outb" stantment how follow:
#define iobase 0x2f8 #define UART_LCR(iobase) (iobase+3)
if (ioperm(UART_LCR(iobase), 1, 1)) {
perror("ioperm");
exit(1); } outb(0x40, UART_LCR(iobase)); // ptt on
With above stantments, soundmodem tx-led switchs on so i think this is a
right way to set RTS signal but my transciver don't start to trasmit! (i
have checked: soundmodem is OK and works correctly for packet).
I have done numerous attempts like this but transciver never trasmits and
i really don't know why.
Finally, my question to all you with more C experience than me is : how
can I set/unset RTS serial signal in order to start/stop transciver
trasmission ?
Any help will be very appreciated, please redirect your answer to my
personal email-address too.
Andrea Barbaresi ---------------------------------------------------------
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