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249 | /* filename mcd_out.c (send phrase)
*/
#include <stdio.h>
#include <string.h>
#include <ctype.h>
#include <Arduino.h>
#include "mcd_general.h"
#include "mcd_out.h"
//#include "mcd_utils.h"
#define BUZZER 7 // buzzer on pin 7
#define L1 1 // intra character space time duration
#define L3 3 // inter characters space time duration
#define L7 7 // inter words space time duration
#define CODE_SZ 6 // max morse code size: 5 + 1 (\0)
#define FRNSWORTH 3 // Farnsworth expantion factor between chars and words
static unsigned int F = 330; // a frequency (MI4) to play
/*
DO5 - C5 - 523 Hz
DO#5 - C#5 - 554 Hz
RE5 - D5 - 587 Hz
RE#5 - D#5 - 622 Hz
MI5 - E5 - 659 Hz
FA5 - F5 - 698 Hz
FA#5 - F#5 - 740 Hz
SOL5 - G5 - 784 Hz
SOL#5 - G#5 - 831 Hz
LA5 - A5 - 880 Hz
LA#5 - A#5 - 932 Hz
SI5 - B5 - 988 Hz
*/
static int Tu = 60; // time unit length in milliseconds
static bool Farnsworth = false;
void init_out(){
pinMode(BUZZER, OUTPUT);
}
void set_time_unit(int t){
Tu = t;
}
void set_frequency(unsigned int f){
F = f;
}
void set_farnsworth(bool mode){
Farnsworth = mode;
}
struct node{
char character;
char code[CODE_SZ];
};
static struct node mt[] = {
{'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', "--**"},
{'1', "*----"},
{'2', "**---"},
{'3', "***--"},
{'4', "****-"},
{'5', "*****"},
{'6', "-****"},
{'7', "--***"},
{'8', "---**"},
{'9', "----*"},
{'0', "-----"},
};
char * get_code(char c){
int mt_len = sizeof(mt) / sizeof(node);
static char code[CODE_SZ];
#ifdef DBG
Serial.print("> get_code(");
Serial.print(c);
Serial.println(")");
#endif
memset(code, '\0', CODE_SZ);
for(int i=0; i<mt_len; i++){
if(mt[i].character==c){
strcpy(code, mt[i].code);
break;
}
}
#ifdef DBG
Serial.print("< get_code, ret ");
Serial.println(code);
#endif
return code;
}
/* int play_phrase(char phrase_to_send[])
*
* our state machine:
*
* start <-------+-------------------------+------+
* | | | |
* +-- space --+ | |
* | | |
* +-- char --> send char | |
* | | |
* +-- char --> push back char |
* | send L3 |
* | |
* +-- space -> send L7 --------+
* | |
* +-- \0 ----------------------+
*/
int play_phrase(char p[]){
int i = 0;
#ifdef DBG
Serial.print("> send_phrase(");
Serial.print(p);
Serial.println(")");
// prt("> send_phrase(%s)\n", p); //to DEBUG
#endif
while(p[i] != '\0'){ // start
if(p[i]==' '){ // got space: back to start
i++;
continue;
}
else{ // got char, send it
play_char(p[i]);
i++;
if(p[i]!=' ' && p[i]!='\0'){ // next: char; push back char (no needed); send L3; back to start
play_signal(LOW, L3);
#ifdef DBG
Serial.println(); // this is CR for play_signal debug
#endif
continue;
}
else if(p[i]==' '){ // next: space; send L7; back to start
play_signal(LOW, L7);
#ifdef DBG
Serial.println(); // this is CR for play_signal debug
#endif
continue;
}
else{
#ifdef DBG
Serial.println(); // this is CR for play_signal debug
#endif
; // next: \0; back to start
}
}
}
#ifdef DBG
Serial.println("< send_phrase: ret 0");
#endif
return 0;
}
/* int play_char(char char_to_send) */
int play_char(char c){
char code[CODE_SZ];
#ifdef DBG
Serial.print("> play_char(");
Serial.print(c);
Serial.println(")");
#endif
c = tolower(c);
strcpy(code, get_code(c));
// #ifdef DBG
// Serial.print("- play_char: code to send is ");
// Serial.println(code);
// #endif
for(int i=0;code[i]!='\0';i++){
if(code[i]=='*'){
play_signal(HIGH, L1);
}
else{
play_signal(HIGH, L3);
}
if(code[i+1]!='\0')
play_signal(LOW, L1);
}
#ifdef DBG
Serial.println(); // CR for play signal character debug
#endif
#ifdef DBG
Serial.println("< play_char, ret 0");
#endif
return 0;
}
int play_signal(int s, int i){
int t = Tu * i;
if(s==HIGH){
#ifdef DBG
Serial.print("H");
Serial.print(i);
Serial.print(" ");
#endif
tone(BUZZER, (unsigned int) F);
delay(t);
noTone(BUZZER);
}
else{
#ifdef DBG
Serial.print("L");
Serial.print(i);
Serial.print(" ");
#endif
if(Farnsworth && i!=1){
delay(t*FRNSWORTH);
}
else
delay(t);
}
return 0;
}
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