/usr/share/svxlink/events.d/CW.tcl is in svxlink-server 14.08.1-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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#
# This code is used to send morse code messages.
#
# This file is sourced by the main event handler file so no manual inclusion
# is necessary. Use functions CW::setWpm or CW::setCpm to set the CW speed.
# Use functions CW::setPitch to set the pitch and CW::setAmplitude to set the
# amplitude. Then use CW::play to play some text. See documentation for each
# function below.
#
###############################################################################
namespace eval CW {
# Timing variables
variable short_len;
variable long_len;
variable char_spacing;
variable letter_spacing;
variable word_spacing;
# The pitch of the CW audio
variable fq;
# The amplitude of the CW audio
variable amplitude;
# Morse code table
array set letters {
"A" ".-"
"B" "-..."
"C" "-.-."
"D" "-.."
"E" "."
"F" "..-."
"G" "--."
"H" "...."
"I" ".."
"J" ".---"
"K" "-.-"
"L" ".-.."
"M" "--"
"N" "-."
"O" "---"
"P" ".--."
"Q" "--.-"
"R" ".-."
"S" "..."
"T" "-"
"U" "..-"
"V" "...-"
"W" ".--"
"X" "-..-"
"Y" "-.--"
"Z" "--.."
"0" "-----"
"1" ".----"
"2" "..---"
"3" "...--"
"4" "....-"
"5" "....."
"6" "-...."
"7" "--..."
"8" "---.."
"9" "----."
"." ".-.-.-"
"," "--..--"
"?" "..--.."
"/" "-..-."
"=" "-...-"
" " " "
}
# Private function
proc calculateTimings {} {
variable short_len;
variable long_len [expr $short_len * 3];
variable char_spacing $short_len;
variable letter_spacing [expr $short_len * 3];
variable word_spacing [expr $short_len * 7];
}
#
# Set the CW speed in words per minute
#
proc setWpm {wpm} {
variable short_len [expr 60000 / (50 * $wpm)];
calculateTimings;
}
#
# Set the CW speed in characters per minute
#
proc setCpm {cpm} {
variable short_len [expr 60000 / (10 * $cpm)];
calculateTimings;
}
#
# Set the pitch (frequency), in Hz, of the CW audio.
#
proc setPitch {new_fq} {
variable fq $new_fq;
}
#
# Set the amplitude in per mille (0-1000) of full amplitude.
#
proc setAmplitude {new_amplitude} {
variable amplitude $new_amplitude;
}
#
# Play the given CW text
#
proc play {txt} {
variable short_len;
variable long_len;
variable char_spacing;
variable letter_spacing;
variable word_spacing;
variable fq;
variable amplitude;
variable letters;
set txt [string toupper $txt];
set first_letter 1;
foreach letter [split $txt ""] {
if {!$first_letter} {
playSilence $letter_spacing;
}
set first_letter 0;
set first_char 1;
foreach char [split $letters($letter) ""] {
if {!$first_char} {
playSilence $char_spacing;
}
set first_char 0;
if {$char == "."} {
playTone $fq $amplitude $short_len;
} elseif {$char == "-"} {
playTone $fq $amplitude $long_len;
} elseif {$char == " "} {
playSilence $word_spacing;
}
}
}
}
# Set defaults
setPitch 800;
setAmplitude 500;
setCpm 100;
}
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