Interrupt Servie Routines using an Arduino 2560 Mega

1/*
2 *   Simple Arduino CW program to emulate a Memory Keyer 
3 *   with sound and a flashing LED Has 4 pre-defined memories.
4 *   Text is shown  on a 0.91" OLED display. We are using an 
5 *   Arduino Mega 2560 because we  need 4 hardware interrupts
6 *   
7 *   Paul M Dunphy, VE1DX
8 *   
9 *   March 2020
10 */
11 
12#include "U8glib.h"
13U8GLIB_SSD1306_128X32 u8g(U8G_I2C_OPT_NONE);
14
15char  *myMem[] = {
16                 "CQ CQ VE1DX TEST",  
17                 "DE  VE1DX 5NN 05",
18                 "TU DE VE1DX TEST",  
19                 "AGN  ?"
20                 };
21char mess[100];                
22
23const char*  MorseTable[] = {
24  NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
25  NULL,  NULL, NULL, NULL, NULL, NULL, NULL, NULL,
26  NULL, NULL, NULL, NULL, NULL, NULL,  NULL, NULL,
27  NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
28  // space,  !, ", #, $, %, &, '
29  NULL, "-.-.--", ".-..-.", ".----.","...-.-", NULL,  NULL,NULL,
30  // ( ) * + , - . /
31  "-.--.", "-.--.-", NULL, ".-.-.",  "--..--", "-....-", ".-.-.-", "-..-.",
32  // 0 1 2 3 4 5 6 7
33  "-----",  ".----", "..---", "...--", "....-", ".....", "-....", "--...",
34  // 8 9 : ; < = > ?
35  "---..", "----.", "---...", "-.-.-.", NULL, "-...-",  NULL, "..--..",
36  // @ A B C D E F G
37  ".--.-.", ".-", "-...", "-.-.",  "-..", ".", "..-.", "--.",
38  // H I J K L M N O
39  "....", "..",  ".---", "-.-", ".-..", "--", "-.", "---",
40  // P Q R S T U V W
41  ".--.", "--.-", ".-.", "...", "-", "..-", "...-", ".--",
42  //  X Y Z [ \] ^ _
43  "-..-", "-.--", "--..", NULL, NULL, NULL, NULL, "..--.-",
44  // ' a b c d e f g
45  NULL, ".-", "-...", "-.-.", "-..", ".", "..-.",  "--.",
46  // h i j k l m n o
47  "....", "..", ".---", "-.-", ".-..",  "--", "-.", "---",
48  // p q r s t u v w
49  ".--.", "--.-", ".-.",  "...", "-", "..-", "...-", ".--",
50  // x y z { | } ~ DEL
51  "-..-",  "-.--", "--..", NULL, NULL, NULL, NULL, NULL,
52};
53
54int dotLength = 40;
55int  dashLength = dotLength * 3;
56int CW_pin = A0;
57int flashPin = 13;
58int freq  = 650;
59int Pin2 = 2;
60int Pin3 = 3;
61int Pin18 = 18;
62int Pin19 = 19;
63volatile  int mess_number = 0;
64volatile int buttonState = 0;
65
66volatile boolean pressed  = false;
67
68
69void clearOLED(){
70    u8g.firstPage(); 
71    do {
72    }  while( u8g.nextPage() );
73}
74
75
76
77void prompt(void) {
78  u8g.setFont(u8g_font_unifont);
79  u8g.drawStr( 0, 22, "Press 1-4");
80}
81
82
83
84void showText(void) {
85  u8g.setFont(u8g_font_unifont);
86  u8g.drawStr( 0, 22, mess);
87}
88
89
90
91void  setup()
92  {
93    clearOLED();    
94    memset(mess,0,strlen(mess));
95    pinMode(flashPin,  OUTPUT);
96    pinMode(CW_pin, OUTPUT);
97    pinMode(Pin2, INPUT_PULLUP);
98    pinMode(Pin3, INPUT_PULLUP);
99    pinMode(Pin18, INPUT_PULLUP);
100    pinMode(Pin19,  INPUT_PULLUP);
101    attachInterrupt(digitalPinToInterrupt(Pin2), ISR_2, RISING);
102    attachInterrupt(digitalPinToInterrupt(Pin3), ISR_3, RISING);
103    attachInterrupt(digitalPinToInterrupt(Pin18),  ISR_18, RISING);
104    attachInterrupt(digitalPinToInterrupt(Pin19), ISR_19, RISING);
105  }
106
107
108
109void loop() 
110  {
111  int i = 0; 
112  char ch;
113  
114  u8g.firstPage(); 
115  do {
116       prompt();
117     } while( u8g.nextPage()  );
118
119  
120  if (pressed == true) 
121    { 
122      strcpy(mess, myMem[mess_number-1]);
123      
124      u8g.firstPage(); 
125      do {
126         showText();
127         }  while( u8g.nextPage() );
128
129      ch = mess[i];
130      while (ch != NULL )
131        {
132          i++;
133          makeDashDot(MorseTable[ch]);
134          delay(dotLength  * 2);
135          ch = mess[i];
136         }
137       pressed = false;
138       i  = 0; 
139     }
140
141  }
142  
143
144
145void makeDashDot(const char * morseCode)
146{
147  int i = 0;
148  while (morseCode[i] != 0)
149  {
150    if (morseCode[i] == '.')  {
151      dot();
152    } else if (morseCode[i] == '-') {
153      dash();
154    }
155    i++;
156  }
157}
158
159
160
161void dot()
162{
163  digitalWrite(flashPin,  HIGH);
164  tone(CW_pin, freq);
165  delay(dotLength);
166  digitalWrite(flashPin,  LOW);
167  noTone(CW_pin);
168  delay(dotLength);
169}
170
171
172
173void dash()
174{
175  digitalWrite(flashPin, HIGH);
176  tone(CW_pin, freq);
177  delay(dashLength);
178  digitalWrite(flashPin, LOW);
179  noTone(CW_pin);
180  delay(dotLength);
181}
182
183
184void  ISR_2()          
185{    
186   noInterrupts();   
187   buttonState = digitalRead(Pin2);                                                             
188   mess_number  = 1;
189   pressed = true;
190   interrupts();
191}
192
193
194
195void ISR_3()          
196{       
197   noInterrupts();    
198   buttonState = digitalRead(Pin3);                                                           
199   mess_number =  2;
200   pressed = true;
201   interrupts();
202}
203
204
205
206void ISR_18()          
207{     
208   noInterrupts();  
209   buttonState = digitalRead(Pin18);                                                               
210   mess_number = 3;
211   pressed = true;
212   interrupts();   
213}
214
215
216
217void  ISR_19()          
218{              
219   noInterrupts();       
220   buttonState  = digitalRead(Pin19);                                                 
221   mess_number  = 4;
222   pressed = true;
223   interrupts();
224}