Diff: main.cpp

Revision:

0:a4f3aa903302

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Fri May 09 15:31:05 2014 +0000
@@ -0,0 +1,51 @@
+/* 
+    INSTRUCCIONES:
+    Suponga que tiene 3 botones con resistencias de pull-up (A, B, C) 
+    y un display de 7 segmentos de cátodo común. Realice un programa 
+    que convierta de número binario a display de 7 segmentos.
+*/
+
+#include "mbed.h"
+
+DigitalIn A(D2);
+DigitalIn B(D3);
+DigitalIn C(D4);
+BusOut display(D5, D6, D7, D8, D9, D10, D11);
+
+void bcd_to_7segment(int number);
+
+bool button_A, button_B, button_C;
+int number;
+ 
+int main() {
+    A.mode(PullUp);
+    B.mode(PullUp);
+    C.mode(PullUp);
+    while(1){
+        button_A = !A;
+        button_B = !B;
+        button_C = !C;
+        number = A + B*2 + C*4; //tambien se puede number = A | B << 1 | C << 2;
+        bcd_to_7segment(number);
+    }   
+}
+
+void bcd_to_7segment(int number){
+    switch (number){
+        case 0:
+            display = 63; break;
+        case 1:
+            display = 6; break;
+        case 2:
+            display = 91; break;
+        case 3:
+            display = 79; break;
+        case 4:
+            display = 102; break;
+        case 5:
+            display = 109; break;
+        case 6:
+            display = 125; break;
+        case 7:
+            display = 7; break;
+}
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