File content as of revision 1:2416bbc70934:

// Nucleo OnDeley Oneshot
#include "mbed.h"

// IO instance
#if defined (TARGET_NUCLEO_F746ZG)
DigitalOut myled(PB_0);     // Green
DigitalOut myled2(PB_7);    // Blue
DigitalOut myled3(PB_14);   // Red
DigitalIn mySw(PC_13);      // User button
#define MYSWLOGIC 1
#endif

#if defined (TARGET_NUCLEO_F411RE)
DigitalOut myled(D13);     // LED
DigitalOut myled2(D12);    // 
DigitalOut myled3(D11);   // 
DigitalIn mySw(PC_13);      // User button
#define MYSWLOGIC 0
#endif


// Timer instance
Timeout delay1;
Timeout oneShot1;

// Timer flag
bool swon = false;          // Switch status. Set true when press. Set false when Time up and release. 
bool tmon = false;          // Timer status.  Set to the true when the OneShot timer starts. Set to the false when time up. 

// Function prototype
void upDelay1();
void upOneShot1();

// Functions
// Up time from delay timer. 
void upDelay1(){
    myled2 = 1;                                 // LED on
    oneShot1.attach_us(&upOneShot1, 50000);   // Set oneShot
    tmon = true;                                // tmon flag set.
}

// Up time from oneShot timeer.
void upOneShot1(){
    myled2 = 0;                                 // LED off
    delay1.detach();                            // Timeout::detach
    oneShot1.detach();                          // Timeout::detach
    tmon = false;                               // tmon flag reset.
}

int main() {
    while(1) {
        myled3 = !myled3;
        if (mySw == MYSWLOGIC){                         // If sw on,
            myled = 1;                          // Monitor LED ON
            if(myled2 == 0 && swon == false){   // If timer is not started,
                swon = true;                    //  flag on
                printf("Button is pushed.\r\n");
                delay1.attach_us(&upDelay1, 50000);    // Start delay timer.
            }            
        }else{                                  // If sw off,
            myled = 0; // LED is OFF            //  Monitor LED off
            if(tmon == false){                  //  If timer is completed,
                swon = false;                   //      frag reset.
                delay1.detach();                //      Cansel the on delay timer.
            }
         }
    }
}