Tadao Iida
エレキジャック Web版 mbedで初めてのマイコン開発 メモリカードを使ったデータの読み書き<2/3> 音符データをSDから読み込んで音楽を鳴らすプログラムです。 音楽データはエレキジャックのサイトに置いてあります。 music.txt http://www.eleki-jack.com/arm/2010/12/mbed-6.html
Dependencies: TextLCD mbed SDFileSystem
Diff: MySound.cpp
- Revision:
- 0:f0cd2b9de695
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/MySound.cpp Fri Feb 04 15:09:01 2011 +0000
@@ -0,0 +1,118 @@
+#include "MySound.h"
+
+MySound::MySound(PinName out) : _out(out){
+ _out = 0;
+}
+
+void MySound::play(char pn,int s, char l)
+{
+ double freq,f;
+ double scale ;
+ float length ;
+
+ switch(l){
+ case 'W':
+ length = 4 ;
+ break ;
+ case 't':
+ length = 3;
+ break ;
+ case 'D':
+ length = 2 ;
+ break;
+ case 'Q':
+ length = 1;
+ break;
+ case 'q':
+ length = 1.5;
+ break;
+ case 'E':
+ length = 0.5;
+ break;
+ case 'S':
+ length = 0.25;
+ break;
+ case 'T':
+ length = 0.125;
+ break;
+ default:
+ length = 1;
+ }
+
+ switch(pn){
+ case 'a':
+ freq = 415.30469 ;
+ break;
+ case 'A':
+ freq = 440.0;
+ break ;
+ case 'b':
+ freq = 466.16876;
+ break;
+ case 'B':
+ freq = 493.88330;
+ break ;
+ case 'C':
+ freq = 261.62556;
+ break ;
+ case 'd':
+ freq = 277.18263;
+ break ;
+ case 'D':
+ freq = 293.66476;
+ break;
+ case 'e':
+ freq = 311.12698;
+ break ;
+ case 'E':
+ freq = 329.62755;
+ break ;
+ case 'F':
+ freq = 349.22823;
+ break;
+ case 'g':
+ freq = 369.99442;
+ break ;
+ case 'G':
+ freq = 391.99543;
+ break ;
+ case 'R':
+ freq = 0.0;
+ break ;
+ default:
+ freq = 440;
+ }
+
+ switch ( s ){
+ case 6:
+ f = freq * 4.0 ;
+ break;
+ case 5:
+ f = freq * 2.0 ;
+ break;
+ case 4:
+ f = freq;
+ break;
+ case 3:
+ f = freq / 2.0 ;
+ break;
+ case 2:
+ f = freq / 4.0;
+ break;
+ default:
+ f = freq ;
+ break ;
+ }
+
+ scale = 1.0/(2.0*f);
+
+// printf("scale=%lf\tf=%f\tfreq=%f\tlength=%lf\n",scale,f,freq,length);
+// printf("f*length=%lf\tfreq=%lf\t%lf \n",f*length,freq,scale);
+
+ for(int i = 0 ; i <= (int)( f * length ) ; i++ ){
+ _out = 1;
+ wait(scale) ;
+ _out = 0 ;
+ wait(scale) ;
+ }
+}
\ No newline at end of file