File content as of revision 2:74e66e0bc451:

#include "mbed.h"
#include "keypad.h" 
#include "TextLCD.h"
 
TextLCD lcd(PTB10, PTB11, PTE2, PTE3, PTE4, PTE5); // rs, e, d4-d7
DigitalOut Sonido(PTB8);

PwmOut Pwm(PTA5);

 
float pp=0.001;
float Dd=0.1;
char key,keyy;
int C1=0x0F;

// Define your own keypad values
char Keytable[] = { '1', '2', '3', 'A',
                     '4', '5', '6', 'B',
                      '7', '8', '9', 'C',
                      '*', '0', '#', 'D'
                    };
 
 
//PWM                   
int PWMmodule(float pp,float Dd)
{
        Pwm.period(pp);
        Pwm.write(Dd);
        wait(0.1);
        Pwm.write(0); 
        return 0;
}

uint32_t cbAfterInput(uint32_t Key)
{
        
        PWMmodule(pp,Dd);
        key=Key;
        lcd.locate(0,0);
        lcd.printf("%c",Keytable[key]);
            
        return 0;
}
 
int main()

{
  
    
    //             r0   r1   r2   r3   c0   c1   c2   c3
    Keypad keypad(PTA2,PTD4,PTD3,PTD1,PTD2,PTD0,PTD5,PTA13);
    keypad.CallAfterInput(&cbAfterInput);
    keypad.Start();  

 
    while (1) 
    {
            
    }
}