Diff: main.cpp

Revision:

1:11303019663d

Parent:

0:2f4ee2a22324

Child:

2:12e0dd6bced5

--- a/main.cpp	Fri Feb 17 11:13:02 2017 +0000
+++ b/main.cpp	Fri Feb 17 11:41:13 2017 +0000
@@ -1,6 +1,6 @@
 /* ELEC1620 Application Board Example
 
-Buttons
+RGB LED
 
 (c) Dr Craig A. Evans, University of Leeds, Feb 2017
 
@@ -8,37 +8,47 @@
 
 #include "mbed.h"
 
-DigitalIn button_A(p29);
-DigitalIn button_B(p28);
-DigitalIn button_C(p27);
-DigitalIn button_D(p26);
+DigitalOut red_led(p24);
+DigitalOut green_led(p23);
+DigitalOut blue_led(p22);
+
+void init_leds();
 
-int main() {
-    
+int main()
+{
+
+    init_leds();
+
     while(1) {
-        
-        // read each of the buttons and store in variable
-        int button_A_value = button_A.read();
-        // int button_A_value = button_A;  // this is equivalent
-        int button_B_value = button_B.read();
-        int button_C_value = button_C.read();
-        int button_D_value = button_D.read();
+
+        // writing a 1 turns the LED off, 0 makes it turn on
         
-        // check if pressed (value will be 1 i.e. true) and print message
-        if (button_A_value) {
-            printf("Button A is pressed\n");    
-        }
-        if (button_B_value) {
-            printf("Button B is pressed\n");    
-        }
-        if (button_C_value) {
-            printf("Button C is pressed\n");    
-        }
-        if (button_D_value) {
-            printf("Button D is pressed\n");    
-        }
+        blue_led.write(1);  // blue off
+        red_led.write(0);   // red on
+        wait(0.5);
         
-        wait(0.5);  // small delay - won't be able to read button during delay
+        red_led.write(1);   // red off
+        green_led.write(0); // green on
+        wait(0.5);
         
+        green_led.write(1); // green off
+        blue_led.write(0);  // blue on
+        wait(0.5);
+
+
     }
 }
+
+void init_leds()
+{
+    // LEDs are common anode (active-low) so writing a 1 will turn them off
+    red_led.write(1);
+    green_led.write(1);
+    blue_led.write(1);
+
+    // this syntax is equivalent
+    //red_led = 1;
+    //green_led = 1;
+    //blue_led = 1;
+}
+