From 1b4023134b5ff6342301c8135b11df46546d2828 Mon Sep 17 00:00:00 2001 From: Ralf Baechle Date: Mon, 7 Jun 1999 10:24:56 +0200 Subject: Import ax25-tools 0.0.2 from tarball --- hdlcutil/soundmodem.9 | 82 +++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 82 insertions(+) create mode 100644 hdlcutil/soundmodem.9 (limited to 'hdlcutil/soundmodem.9') diff --git a/hdlcutil/soundmodem.9 b/hdlcutil/soundmodem.9 new file mode 100644 index 0000000..c65837c --- /dev/null +++ b/hdlcutil/soundmodem.9 @@ -0,0 +1,82 @@ +.\" Copyright 1996 Thomas Sailer (sailer@ife.ee.ethz.ch) +.\" May be distributed under the GNU General Public License +.\" " +.TH SOUNDMODEM 9 "2 October 1996" "Linux 2.1.x" "Kernel Reference Guide" +.SH NAME +soundmodem \- amateur (AX.25) packet radio network driver for soundcards +.SH SYNOPSIS + +.nf +.B #include +.B #include +.fi + +.SH DESCRIPTION +The driver currently supports both 1200 baud AFSK and 9600 baud FSK +(G3RUH compatible) using a standard SoundBlaster compatible or +WindowsSoundSystem compatible soundcard. The whole decoding is done +in software, so you definitely do not want to use it on a 386SX class +machine. + +.SH "KEYING THE TRANSMITTER" +Soundcards do not have a DC coupled output that could serve as a +PTT signal. So there are basically for possibilities for +obtaining a PTT signal. Sample schematic diagrams can be found on +\fIhttp://www.ife.ee.ethz.ch/~sailer/pcf/ptt_circ/ptt.html\fP. +.SS "VOX circuitry" +A simple VOX circuitry that detects output signals at the output of +the soundcard can be used, especially as it can be built with a single +transistor plus a few passive components and typical soundcards have +strong output signals. +.SS "Parallel Port" +A parallel port line can also be used to signal PTT. If selected, +the PTT signal is output on the DATA0 line and DCD is output on the +DATA1 line. +.SS "Serial Port" +A standard serial port (8250, 16450, 16550) can also be used to output +PTT. PTT is output on RTS and TxD, while DCD is output on DTR. +.SS "MPU401 MIDI Port" +The MIDI port is basically an asynchronous serial interface and +thus cannot output a straight DC level, however it may be used if +connected through a retriggerable monoflop with about 15ms pulse +duration. Note that only newer SoundBlaster models have a genuine +MPU401 MIDI port. The older SB MIDI port cannot be used. + +.SH "IOCTL CALLS" +The \fBioctl\fP calls follow the implementation in the \fIhdlcdrv\fP. + +.TP +.B SMCTL_GETMODEMTYPE +returns the modem type (i.e. \fISBC1200\fP, \fISBC9600\fP, \fIWSS1200\fP +or \fIWSS9600\fP) +.TP +.B SMCTL_SETMODEMTYPE +sets the modem type. Only superuser can do this. +.TP +.B SMCTL_GETMIXER +returns the mixer type and the contents of the specified +mixer register. +.TP +.B SMCTL_SETMIXER +sets the specified mixer register, if the specified +mixer type matches the mixer type of the soundcard. Only +superuser can do this. +.TP +.B SMCTL_DIAGNOSE +returns the contents of the diagnose buffer, which is used by +\fIsmdiag\fP to display the eye and oscilloscope diagrams. +.TP +.B SMCTL_GETDEBUG +return some debugging values. Not always available. + + +.SH "SEE ALSO" +.BR baycom " (9), " soundmodem " (9)," smdiag " (8)," smmixer " (9)," +linux/drivers/net/hdlcdrv.c, + +.SH AUTHOR +soundmodem was written by Thomas Sailer, HB9JNX/AE4WA, (sailer@ife.ee.ethz.ch). + + + + -- cgit v1.2.3