File content as of revision 7:4f8de47a9641:

#include "mbed.h"

DigitalOut myled(LED1);
DigitalOut T1(PB_3);
DigitalOut T2(PB_4);
DigitalOut T3(PB_5);
DigitalOut T4(PB_10);

int val = 0;

int main() {
    while(1) {
        while(val <= 50) {
            myled = 1; // LED is ON
            T1 = 1;
            T2 = 0;
            T3 = 0;
            T4 = 0;
            wait(0.01); // 200 ms
            myled = 0; // LED is OFF
            T1 = 0;
            T2 = 1;
            T3 = 0;
            T4 = 0;
            wait(0.01); // 1 sec
            T1 = 0;
            T2 = 0;
            T3 = 1;
            T4 = 0;
            wait(0.01);
            T1 = 0;
            T2 = 0;
            T3 = 0;
            T4 = 1;
            wait(0.01);
            val = val + 1;
        }
        while(val >= 0) {
            myled = 1; // LED is ON
            T1 = 0;
            T2 = 0;
            T3 = 1;
            T4 = 0;
            wait(0.01); // 200 ms
            myled = 0; // LED is OFF
            T1 = 0;
            T2 = 1;
            T3 = 0;
            T4 = 0;
            wait(0.01); // 1 sec
            T1 = 1;
            T2 = 0;
            T3 = 0;
            T4 = 0;
            wait(0.01);
            T1 = 0;
            T2 = 0;
            T3 = 0;
            T4 = 1;
            wait(0.01);
            val = val - 1;
        }
    }
}