Revision 3:640558c1c0d3, committed 2015-07-08

Comitter:

BrentLei

Date:

Wed Jul 08 00:09:57 2015 +0000

Parent:

2:09ee85ab1717

Child:

4:dbce53c4e44d

Commit message:

test

Changed in this revision

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/SongPlayer.h	Wed Jul 08 00:09:57 2015 +0000
@@ -0,0 +1,41 @@
+#include "mbed.h"
+// new class to play a note on Speaker based on PwmOut class
+class SongPlayer
+{
+public:
+    SongPlayer(PinName pin) : _pin(pin) {
+// _pin(pin) means pass pin to the constructor
+    }
+// class method to play a note based on PwmOut class
+    void PlaySong(float frequency[], float duration[], float volume=1.0) {
+        vol = volume;
+        notecount = 0;
+        _pin.period(1.0/frequency[notecount]);
+        _pin = volume/2.0;
+        noteduration.attach(this,&SongPlayer::nextnote, duration[notecount]);
+        // setup timer to interrupt for next note to play
+        frequencyptr = frequency;
+        durationptr = duration;
+        //returns after first note starts to play
+    }
+    void nextnote();
+private:
+    Timeout noteduration;
+    PwmOut _pin;
+    int notecount;
+    float vol;
+    float * frequencyptr;
+    float * durationptr;
+};
+//Interrupt Routine to play next note
+void SongPlayer::nextnote()
+{
+    _pin = 0.0;
+    notecount++; //setup next note in song
+    if (durationptr[notecount]!=0.0) {
+        _pin.period(1.0/frequencyptr[notecount]);
+        noteduration.attach(this,&SongPlayer::nextnote, durationptr[notecount]);
+        _pin = vol/2.0;
+    } else
+        _pin = 0.0; //turn off on last note
+}
\ No newline at end of file

--- a/main.cpp	Wed Jul 08 00:05:05 2015 +0000
+++ b/main.cpp	Wed Jul 08 00:09:57 2015 +0000
@@ -1,17 +1,27 @@
 #include "mbed.h"
 #include "C12832.h"
+#include "MMA7660.h"
 
-// 添加MMA7660库文件
-#include "MMA7660.h"
+// 添加旋律播放相关文件
+#include "SongPlayer.h"
+
+// 旋律数据
+float note[18]= {1568.0,1396.9,1244.5,1244.5,1396.9,1568.0,1568.0,1568.0,1396.9,
+                 1244.5,1396.9,1568.0,1396.9,1244.5,1174.7,1244.5,1244.5, 0.0
+                };
+float duration[18]= {0.48,0.24,0.72,0.48,0.24,0.48,0.24,0.24,0.24,
+                     0.24,0.24,0.24,0.24,0.48,0.24,0.48,0.48, 0.0
+                    };
 
 PwmOut led(D5);
 DigitalIn button_up(A2);
 DigitalIn button_center(D4);
 DigitalIn button_down(A3);
 C12832 lcd(D11, D13, D12, D7, D10);
+MMA7660 MMA(D14, D15);
 
-// 初始化MMA7660
-MMA7660 MMA(D14, D15);
+// 初始化D6引脚作为PWM用于驱动扬声器
+SongPlayer mySpeaker(D6);
 
 double brightness = 1.0;
 double brightness_inc = 0.1;
@@ -21,7 +31,10 @@
     int bt_flag = 0;
     lcd.cls();
     led.write(brightness);
-
+    
+    // 播放旋律
+    mySpeaker.PlaySong(note,duration,0.05);
+    
     while (1) {
         bt_flag = 1;
         if(button_up==1)
@@ -40,8 +53,6 @@
         }
         lcd.locate(0, 0);
         lcd.printf("Brightness = %.1f\r\n", 1.0 - brightness);
-        
-        // 显示加速度计的测量结果
         lcd.printf("x=%.2f y=%.2f z=%.2f", MMA.x(), MMA.y(), MMA.z());
         wait(0.2);
     }