main.cpp

00001 #include "mbed.h"
00002 
00003 DigitalOut myled1(LED1);
00004 DigitalOut myled2(LED2);
00005 DigitalOut myled3(LED3);
00006 DigitalOut myled4(LED4);
00007 
00008 InterruptIn mybutton(USER_BUTTON);
00009 
00010 double tempo = 0.3; // LED blinking delay
00011 
00012 // Change LEDs blinking frequency
00013 void change_blinking_frequency() {
00014     if (tempo == 0.3) // If leds have low frequency
00015         tempo = 0.1;  // Set the fast frequency
00016     else              // If leds have fast frequency
00017         tempo = 0.3;  // Set the low frequency
00018 }
00019 
00020 int main() {
00021     // All LEDs are OFF
00022     myled1 = 0;
00023     myled2 = 0;
00024     myled3 = 0;
00025     myled4 = 0;
00026 
00027     // Change LEDs blinking frequency when button is pressed
00028     mybutton.fall(&change_blinking_frequency);
00029 
00030     while(1) {
00031         myled2 = 1;   // LED2 is ON
00032         wait(tempo);  // wait tempo
00033         myled2 = 0;   // LED2 is OFF
00034         myled1 = 1;   // LED1 is ON
00035         wait(tempo);  // wait tempo
00036         myled1 = 0;   // LED1 is OFF
00037         myled3 = 1;   // LED3 is ON
00038         wait(tempo);  // wait tempo
00039         myled3 = 0;   // LED3 is OFF
00040         myled4 = 1;   // LED4 is ON
00041         wait(tempo);  // wait tempo
00042         myled4 = 0;   // LED4 is OFF
00043     }
00044 }