Diff: beep.cpp

Revision:

5:49c961e79a12

Parent:

4:d8e14429a95f

--- a/beep.cpp	Tue Sep 11 08:21:45 2012 +0000
+++ b/beep.cpp	Thu Sep 22 18:11:47 2016 +0000
@@ -1,5 +1,6 @@
 #include "beep.h"
 #include "mbed.h"
+#include "notes.h"
 
 /** class to make sound with a buzzer, based on a PwmOut
  *   The class use a timeout to switch off the sound  - it is not blocking while making noise
@@ -20,6 +21,14 @@
  * @endcode
  */
 
+int notes[] = { 0,
+NOTE_C4, NOTE_CS4, NOTE_D4, NOTE_DS4, NOTE_E4, NOTE_F4, NOTE_FS4, NOTE_G4, NOTE_GS4, NOTE_A4, NOTE_AS4, NOTE_B4,
+NOTE_C5, NOTE_CS5, NOTE_D5, NOTE_DS5, NOTE_E5, NOTE_F5, NOTE_FS5, NOTE_G5, NOTE_GS5, NOTE_A5, NOTE_AS5, NOTE_B5,
+NOTE_C6, NOTE_CS6, NOTE_D6, NOTE_DS6, NOTE_E6, NOTE_F6, NOTE_FS6, NOTE_G6, NOTE_GS6, NOTE_A6, NOTE_AS6, NOTE_B6,
+NOTE_C7, NOTE_CS7, NOTE_D7, NOTE_DS7, NOTE_E7, NOTE_F7, NOTE_FS7, NOTE_G7, NOTE_GS7, NOTE_A7, NOTE_AS7, NOTE_B7
+};
+
+
 using namespace mbed;
  // constructor
  /** Create a Beep object connected to the specified PwmOut pin
@@ -52,5 +61,151 @@
 }
 
 
+void Beep::playRttl(char *p){
+  char default_dur = 4;
+  char default_oct = 6;
+  int bpm = 63;
+  int num;
+  long wholenote;
+  long duration;
+  char note;
+  char scale;
+
+  // format: d=N,o=N,b=NNN:
+  // find the start (skip name, etc)
+
+  while(*p != ':') p++;    // ignore name
+  p++;                     // skip ':'
+
+  // get default duration
+  if(*p == 'd')
+  {
+    p++; p++;              // skip "d="
+    num = 0;
+    while(isdigit(*p))
+    {
+      num = (num * 10) + (*p++ - '0');
+    }
+    if(num > 0) default_dur = num;
+    p++;                   // skip comma
+  }
+
+
+  // get default octave
+  if(*p == 'o')
+  {
+    p++; p++;              // skip "o="
+    num = *p++ - '0';
+    if(num >= 3 && num <=7) default_oct = num;
+    p++;                   // skip comma
+  }
+
+
+  // get BPM
+  if(*p == 'b')
+  {
+    p++; p++;              // skip "b="
+    num = 0;
+    while(isdigit(*p))
+    {
+      num = (num * 10) + (*p++ - '0');
+    }
+    bpm = num;
+    p++;                   // skip colon
+  }
+
+
+  // BPM usually expresses the number of quarter notes per minute
+  wholenote = (60 * 1000L / bpm) * 4;  // this is the time for whole note (in seconds)
+    
 
 
+  // now begin note loop
+  while(*p)
+  {
+    // first, get note duration, if available
+    num = 0;
+    while(isdigit(*p))
+    {
+      num = (num * 10) + (*p++ - '0');
+    }
+    
+    if(num) duration = wholenote / num;
+    else duration = wholenote / default_dur;  // we will need to check if we are a dotted note after
+
+    // now get the note
+    note = 0;
+
+    switch(*p)
+    {
+      case 'c':
+        note = 1;
+        break;
+      case 'd':
+        note = 3;
+        break;
+      case 'e':
+        note = 5;
+        break;
+      case 'f':
+        note = 6;
+        break;
+      case 'g':
+        note = 8;
+        break;
+      case 'a':
+        note = 10;
+        break;
+      case 'b':
+        note = 12;
+        break;
+      case 'p':
+      default:
+        note = 0;
+    }
+    p++;
+
+    // now, get optional '#' sharp
+    if(*p == '#')
+    {
+      note++;
+      p++;
+    }
+
+    // now, get optional '.' dotted note
+    if(*p == '.')
+    {
+      duration += duration/2;
+      p++;
+    }
+  
+    // now, get scale
+    if(isdigit(*p))
+    {
+      scale = *p - '0';
+      p++;
+    }
+    else
+    {
+      scale = default_oct;
+    }
+
+    scale += OCTAVE_OFFSET;
+
+    if(*p == ',')
+      p++;       // skip comma for next note (or we may be at the end)
+
+    // now play the note
+
+    if(note)
+    {
+      beep(notes[(scale - 4) * 12 + note], (float)duration/1000);
+      wait((float)duration/1000);
+    }
+    else
+    {
+      //wait((float)duration/1000);
+    }
+  }
+}
+