03-02 FlashingLEDspleLED

From Manuals

Alternately flashes LEDs connected to pins D0 and D1 on connector J9. Please see schematic below for further details.

/*Program Example 3.2: Flashes red and green LEDs in simple time-based pattern
                                            */
#include "mbed.h"
DigitalOut redled(D0);     //define and name a digital output on pin D0
DigitalOut greenled(D1);   //define and name a digital output on pin D1

int main()
{
    while(1) {
        redled = 1;
        greenled = 0;
        wait(0.2);
        redled = 0;
        greenled = 1;
        wait(0.2);
    }
}

Schematic for example 03-02