Revision 1:f17240b3e85e, committed 2018-04-20

Comitter:

eencae

Date:

Fri Apr 20 13:59:18 2018 +0000

Parent:

0:836cdf67dbdb

Commit message:

Added set_bpm method.

Changed in this revision

--- a/Tone.cpp	Wed Mar 08 17:15:42 2017 +0000
+++ b/Tone.cpp	Fri Apr 20 13:59:18 2018 +0000
@@ -30,15 +30,21 @@
 
 }
 
+void Tone::set_bpm(float bpm)
+{
+    _bpm = bpm;
+}
+
+
 void Tone::play(float frequency,float duration)
 {
     // calculate time step between samples
     float dt = 1.0/(frequency*_n);
     // start from beginning of LUT
     _sample = 0;
-    
+
     // setup ticker and timeout to stop ticker
-    
+
     // the ticker repeats every dt to plat each sample in turn
     ticker->attach(callback(this, &Tone::ticker_isr), dt);
     // the timeout stops the ticker after the required duration
@@ -51,9 +57,9 @@
     _bpm = bpm;
     _notes = notes;  // pointer for array
     _durations = durations;  // pointer for array
-    _melody_length = length; 
-    _repeat = repeat;  
-    
+    _melody_length = length;
+    _repeat = repeat;
+
     _note = 0;  // start from first note
 
     play_next_note(); // play the next note in the melody
@@ -63,17 +69,17 @@
 void Tone::play_next_note()
 {
     // _note is the note index to play
-    
+
     // calculate the duration and frequency of the note
     float duration = 60.0/(_bpm*_durations[_note]);
     float frequency = float(_notes[_note]);
     //printf("[%i] f = %f d = %f\n",_note,frequency,duration);
-    
+
     // check if the note is not a space and if not then play the note
     if (frequency > 0) {
-        play(frequency,duration);  
+        play(frequency,duration);
     }
-    
+
     // the timeout goes to the next note in the melody
     // double the duration to leave a bit of a gap in between notes to be better
     // able to distinguish them
@@ -84,10 +90,10 @@
 void Tone::note_timeout_isr()
 {
     _note++; // go onto next note
-    
+
     // if in repeat mode then reset the note counter when get to end of melody
     if (_repeat && _note == _melody_length) {
-        _note=0;    
+        _note=0;
     }
 
     // check if note is within the melody

--- a/Tone.h	Wed Mar 08 17:15:42 2017 +0000
+++ b/Tone.h	Fri Apr 20 13:59:18 2018 +0000
@@ -21,6 +21,9 @@
     
     // play array of notes and duration, must send length and beats per minute
     void play_melody(int length,const int *notes,const int *durations,float bpm,bool repeat);
+    
+    // change the BPM
+    void set_bpm(float bpm);
      
     private: