Yasushi TAUCHI / Mbed 2 deprecated Sound_PWM_2

PWMによる音だし(疑似Sin波)

Dependencies:   mbed

Diff: main.cpp

Revision:
1:e1919d5190b3
Parent:
0:5a95bead7a47
--- a/main.cpp	Mon Dec 26 12:58:19 2011 +0000
+++ b/main.cpp	Thu Dec 29 06:06:16 2011 +0000
@@ -14,24 +14,24 @@
 float m1;
 
 void sound_out(void) {
-    static float j=0; 
+    static float j=0;
     j=j+m1;
-    if(j>180)j=j-180;
+    if (j>180)j=j-180;
     sp1.write(ms[(int)j]);
 }
 
 int main() {
     float mm[]={mC,mD,mE,mF,mG,mA,mB,mC*2};
     int i;
-    for (i=0;i<180;i++) {
+    for (i=0; i<180; i++) {
         ms[i]=sin(2*3.1415*(float)i/180.0)/2.0+0.5;
     }
 
-    sp1.period_us(10); 
+    sp1.period_us(10);
+    timer.attach_us(&sound_out,100);
 
-    for (i=0;i<sizeof(mm);i++) {
+    for (i=0; i<sizeof(mm); i++) {
         m1=mm[i]*180/10000;
-        timer.attach_us(&sound_out,100);
         wait(0.5f);
     }
     sp1.write(0.0f);