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/* CWirc - X-Chat plugin for sending and receiving raw morse code over IRC
(c) Pierre-Philippe Coupard - 18/06/2003
Iambic keyer implementation
This program is distributed under the terms of the GNU General Public License
See the COPYING file for details
*/
#include "types.h"
#include "keyer.h"
/* Definitions */
#define NO_TIMEOUTS_SCHED -2
#define NO_ELEMENT -1
#define DIT 0
#define DAH 1
#define MODE_A 0
#define MODE_B 1
#define NO_PADDLE_SQUEEZE 0
#define PADDLES_SQUEEZED 1
#define PADDLES_RELEASED 2
#define NO_DELAY 0
#define CHAR_SPACING_DELAY 1
#define WORD_SPACING_DELAY 2
/* Implement the keyer. Ticklen is the time interval in ms between 2 calls to
the function. Return the state of the keyer-generated "straight key" */
T_BOOL cwirc_run_keyer(struct cwirc_keyer_state *is,T_BOOL dit,T_BOOL dah,
int wpm,int iambicmode,T_BOOL midelementmodeB,T_BOOL ditmemory,
T_BOOL dahmemory,T_BOOL autocharspacing,T_BOOL autowordspacing,
int weight,double ticklen)
{
double ditlen=1200/(double)wpm;
int set_element_timeouts=NO_TIMEOUTS_SCHED;
/* Do we need to initialize the keyer ? */
if(!is->keyer_initialized)
{
is->prev_dit=dit;
is->prev_dah=dah;
is->last_element=is->current_element=NO_ELEMENT;
is->iambic_in_element=NO_PADDLE_SQUEEZE;
is->paddles_squeezed_after_mid_element=0;
is->insert_inverted_element=0;
is->mid_element_timeout=is->beep_timeout=is->element_timeout=0;
is->delay_timeout=0;
is->delay_type=NO_DELAY;
is->keyer_initialized=1;
}
/* Decrement the timeouts */
is->delay_timeout-=is->delay_timeout>0?ticklen:0;
if(is->delay_timeout<=0)
{
/* If nothing is scheduled to play, and we just did a character spacing
delay, and we do auto word spacing, wait for a word spacing delay,
otherwise resume the normal element timeout countdowns */
if(is->element_timeout<=0 && is->delay_type==CHAR_SPACING_DELAY &&
autowordspacing)
{
is->delay_timeout=ditlen*4;
is->delay_type=WORD_SPACING_DELAY;
}
else
{
is->delay_type=NO_DELAY;
is->mid_element_timeout-=is->mid_element_timeout>0?ticklen:0;
is->beep_timeout-=is->beep_timeout>0?ticklen:0;
is->element_timeout-=is->element_timeout>0?ticklen:0;
}
}
/* Are both paddles squeezed ? */
if(dit && dah)
{
is->iambic_in_element=PADDLES_SQUEEZED;
/* Are the paddles squeezed past the middle of the element ? */
if(is->mid_element_timeout<=0)
is->paddles_squeezed_after_mid_element=1;
}
else
/* Are both paddles released and we had gotten a squeeze in this element ?*/
if(!dit && !dah && is->iambic_in_element==PADDLES_SQUEEZED)
is->iambic_in_element=PADDLES_RELEASED;
/* Is the current element finished ? */
if(is->element_timeout<=0 && is->current_element!=NO_ELEMENT)
{
is->last_element=is->current_element;
/* Should we insert an inverted element ? */
if(((dit && dah) ||
(is->insert_inverted_element && is->iambic_in_element!=
PADDLES_RELEASED) ||
(is->iambic_in_element==PADDLES_RELEASED && iambicmode==MODE_B &&
(!midelementmodeB || is->paddles_squeezed_after_mid_element)) ) )
{
if(is->last_element==DAH)
set_element_timeouts=is->current_element=DIT;
else
set_element_timeouts=is->current_element=DAH;
}
else
{
/* No more element */
is->current_element=NO_ELEMENT;
/* Do we do automatic character spacing ? */
if(autocharspacing && !dit && !dah)
{
is->delay_timeout=ditlen*2;
is->delay_type=CHAR_SPACING_DELAY;
}
}
is->insert_inverted_element=0;
is->iambic_in_element=NO_PADDLE_SQUEEZE;
is->paddles_squeezed_after_mid_element=0;
}
/* Is an element currently being played ? */
if(is->current_element==NO_ELEMENT)
{
if(dah) /* Dah paddle down ? */
set_element_timeouts=is->current_element=DAH;
else if(dit) /* Dit paddle down ? */
set_element_timeouts=is->current_element=DIT;
}
/* Do the dah memory */
if(is->current_element==DIT && !is->prev_dah && dah && dahmemory)
is->insert_inverted_element=1;
/* Do the dit memory */
if(is->current_element==DAH && !is->prev_dit && dit && ditmemory)
is->insert_inverted_element=1;
/* If we had a dit (or dah) scheduled to be played after a delay, and the
operator lifted both paddles before the end of the delay, and we have no
dit (or dah) memory, forget it */
if(is->delay_timeout>0 && !dit && !dah && (
(is->current_element==DIT && !ditmemory) ||
(is->current_element==DAH && !dahmemory)
))
set_element_timeouts=is->current_element=NO_ELEMENT;
/* Do we need to set the playing timeouts of an element? */
switch(set_element_timeouts)
{
case NO_ELEMENT: /* Cancel any dit or dah */
is->beep_timeout=0;
is->mid_element_timeout=0;
is->element_timeout=0;
break;
case DIT: /* Schedule a dit ? */
is->beep_timeout=(ditlen*(double)weight)/50;
is->mid_element_timeout=is->beep_timeout/2;
is->element_timeout=ditlen*2;
break;
case DAH: /* Schedule a dah ? */
is->beep_timeout=(ditlen*(double)weight)/50 + ditlen*2;
is->mid_element_timeout=is->beep_timeout/2;
is->element_timeout=ditlen*4;
break;
}
is->prev_dit=dit;
is->prev_dah=dah;
return(is->beep_timeout>0 && is->delay_timeout<=0?1:0);
}
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