Tadao Iida
mbed/ARM 活用事例 第3章 SDカードを使ってファイルを操作するプログラムを作る
Dependencies: TextLCD mbed SDFileSystem
Diff: MySound.cpp
- Revision:
- 0:c743b6678d88
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/MySound.cpp Tue Oct 04 12:59:42 2011 +0000
@@ -0,0 +1,125 @@
+// --- MySound.cpp ---
+#include "MySound.h"
+
+MySound::MySound(PinName out) : _out(out){
+
+}
+
+void MySound::play(char pn,int s, char l)
+{
+ double freq,f;
+ float length ;
+ int scale ;
+ int begin;
+
+ 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 ;
+ break;
+ case 5:
+ f = freq * 2 ;
+ break;
+ case 4:
+ f = freq;
+ break;
+ case 3:
+ f = freq / 2 ;
+ break;
+ case 2:
+ f = freq / 4;
+ break;
+ default:
+ f = freq ;
+ break ;
+ }
+
+ scale = (int)((1.0/f)*1e6) ;
+ _out.period_us(scale);
+
+ t.start();
+ begin = t.read_ms() ;
+ if ( pn != 'R' ){
+ while(t.read_ms()-begin < (int)(500 * length) ){
+ _out.write(0.5f);
+ }
+ }else{
+ while(t.read_ms()-begin < (int)(500 * length) ){
+ _out.write(0.0f);
+ }
+ }
+ t.stop();
+ t.reset();
+}