Diff: main.cpp

Revision:

0:9c24ad364892

diff -r 000000000000 -r 9c24ad364892 main.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Thu Nov 05 01:37:13 2015 +0000
@@ -0,0 +1,170 @@
+//mbedSwTone
+// tact Swtitch is pushed then output Beep tone from Piezoelectric speaker 
+//
+//
+//
+#include "mbed.h"
+
+//define sw ports
+DigitalIn k1(p13);
+DigitalIn k2(p15);
+DigitalIn k3(p14);
+DigitalIn k4(p17);
+DigitalIn k5(p18);
+DigitalIn k6(p19);
+DigitalIn k7(p10);
+DigitalIn k8(p20);
+DigitalIn k9(p9);
+DigitalIn k10(p7);
+DigitalIn k11(p8);
+DigitalIn k12(p6);
+DigitalIn k13(p5);
+DigitalIn k14(p22);
+DigitalIn k15(p21);
+DigitalIn k16(p23);
+DigitalIn k17(p24);
+DigitalIn k18(p25);
+DigitalIn k19(p29);
+DigitalIn k20(p27);
+DigitalIn k21(p30);
+DigitalIn k22(p28);
+
+#define SW_N 22//number of key switches
+PwmOut speaker(p26);
+
+DigitalOut led(p11);
+
+//switch status 0:off, 1:posEdge, 2:on, 3:negEdge
+int sw_st[SW_N];
+
+//period array
+int p[SW_N]={
+1912,
+1805,
+1703,
+1608,
+1518,
+1432,
+1352,
+1276,
+1205,
+1137,
+1073,
+1013,
+956,
+902,
+852,
+804,
+759,
+716,
+676,
+638,
+602,
+568
+};
+
+void chksw(void)
+{
+    static int ssw[SW_N], psw[SW_N], cnt[SW_N], tcnt[SW_N];
+    int i;
+
+    psw[0] = k1;
+    psw[1] = k2;
+    psw[2] = k3;
+    psw[3] = k4;
+    psw[4] = k5;
+    psw[5] = k6;
+    psw[6] = k7;
+    psw[7] = k8;
+    psw[8] = k9;
+    psw[9] = k10;
+    psw[10] = k11;
+    psw[11] = k12;
+    psw[12] = k13;
+    psw[13] = k14;
+    psw[14] = k15;
+    psw[15] = k16;
+    psw[16] = k17;
+    psw[17] = k18;
+    psw[18] = k19;
+    psw[19] = k20;
+    psw[20] = k21;
+    psw[21] = k22;
+
+//switch status 0:off, 1:posEdge, 2:on, 3:negEdge
+    for(i = 0; i < SW_N; i++){
+        if((ssw[i] == 0)&&(psw[i] == 0)){
+            sw_st[i] = 2;//on
+            tcnt[i] ++;
+        }
+        if((ssw[i] == 0)&&(psw[i] == 1)){
+            sw_st[i] = 3;//negEdge
+            cnt[i] = tcnt[i];
+        }
+        if((ssw[i] == 1)&&(psw[i] == 1)){
+            sw_st[i] = 0;//off
+            tcnt[i] ++;
+        }
+        if((ssw[i] == 1)&&(psw[i] == 0)){
+            sw_st[i] = 1;//posEdge
+            cnt[i] = tcnt[i];
+        }
+        ssw[i] = psw[i];
+    }
+}
+
+void beepon(int i)
+{
+    speaker.period_us(p[i]);//change period 
+    speaker.write(0.5);//duty = 50% -> on
+}
+
+void beepoff(int i)
+{
+    speaker.write(0);//duty = 0% -> off
+}
+
+void beep(void)
+{
+    int i;
+    for(i = 0; i < SW_N; i++){
+        if(sw_st[i] == 1){//Positive edge
+            beepon(i);
+            led = 1;
+        }
+        if(sw_st[i] == 3){//Negative edge
+            beepoff(i);
+            led = 0;
+        }
+    }
+}
+
+int main() {
+//    speaker.pulsewidth(0.5);
+    k1.mode(PullUp);
+    k2.mode(PullUp);
+    k3.mode(PullUp);
+    k4.mode(PullUp);
+    k5.mode(PullUp);
+    k6.mode(PullUp);
+    k7.mode(PullUp);
+    k8.mode(PullUp);
+    k9.mode(PullUp);
+    k10.mode(PullUp);
+    k11.mode(PullUp);
+    k12.mode(PullUp);
+    k13.mode(PullUp);
+    k14.mode(PullUp);
+    k15.mode(PullUp);
+    k16.mode(PullUp);
+    k17.mode(PullUp);
+    k18.mode(PullUp);
+    k19.mode(PullUp);
+    k20.mode(PullUp);
+    k21.mode(PullUp);
+    k22.mode(PullUp);
+    while(1) {
+        chksw();
+        beep();
+    }
+}