Diff: main.cpp

Revision:

0:cfa060762ad7

Child:

1:e004fff01d0d

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Tue Feb 17 20:35:43 2015 +0000
@@ -0,0 +1,72 @@
+#include "mbed.h"
+
+PwmOut buzzer(p21);
+PwmOut speaker(p26);
+
+Serial pc(USBTX, USBRX); 
+DigitalOut cols[4]= {p20,p19,p18,p17};
+InterruptIn rows[4]={p25,p22,p23,p24};
+
+double HZc[] = { 1209.0,   1336.0, 1477.0, 1633.0}; // Colum
+double HZr[] = {697.0, 770.0, 852.0, 941.0}; //Row
+char Keytable[] = { '1', '2', '3', 'A',
+                     '4', '5', '6', 'B',
+                     '7', '8', '9', 'C',
+                     '*', '0', '#', 'D'
+                   };
+ 
+void start(int row){
+    double high = 0, low = 0;
+    if(rows[row].read() == 0) return;
+    for(int i = 0; i < 4; ++i){
+        cols[i].write(0);
+        if(rows[row].read() == 0){
+            high = HZc[i];
+            low = HZr[row];
+            pc.printf("input row %d col %d %c \n", row, i, Keytable[row * 4 + i]);
+            break;
+        }
+    }
+    buzzer.period(low);
+    speaker.period(high);
+    buzzer = 0.5;
+    speaker = 0.5;
+}    
+
+void stop(){
+    buzzer.period(0);
+    speaker.period(0);
+    buzzer = 0;
+    speaker = 0;
+    for(int i = 0; i < 4; ++i) cols[i] = 1;
+}
+
+
+
+void row0Rise(){
+    start(0);
+}
+void row1Rise(){
+    start(1);
+}
+void row2Rise(){
+    start(2);
+}
+void row3Rise(){
+    start(3);
+}
+
+void rowFall(){
+    stop();
+}
+
+int main() {
+    rows[0].rise(&row0Rise);
+    rows[1].rise(&row1Rise);
+    rows[2].rise(&row2Rise);
+    rows[3].rise(&row3Rise);
+    for(int i = 0; i < 4; ++i) rows[i].fall(&rowFall);
+    while(1) {
+        ;
+    }
+}