File content as of revision 0:637e2ec8d164:

#include "mbed.h"

#define PWMB PC_7  //D9
#define DIRB D8    //D8

#define PWMA PB_4  //D5
#define DIRA D4    //D4

PwmOut motorBpower(PWMB);
DigitalOut motorBdirection(DIRB);

PwmOut motorApower(PWMA);
DigitalOut motorAdirection(DIRA);

void avanti();
void indietro();
void destra();
void sinistra();
void fermo();

int main() {
    
    motorBpower.period_ms(10);
    motorApower.period_ms(10);
    
    wait(2);
    
    avanti();
    wait(2);
    fermo();
    
    while(true);
}

void avanti()
{
    motorBdirection = 1; 
    motorAdirection = 0;
    motorBpower.pulsewidth(0.01); // 100%
    motorApower.pulsewidth(0.01); // 100%
}

void indietro()
{
    motorBdirection = 0; 
    motorAdirection = 1;
    motorBpower.pulsewidth(0.01); // 100%
    motorApower.pulsewidth(0.01); // 100%
}

void destra()
{
    motorBdirection = 0; 
    motorAdirection = 0;
    motorBpower.pulsewidth(0.01); // 100%
    motorApower.pulsewidth(0.007); // 70%
}

void sinistra()
{
    motorBdirection = 1; 
    motorAdirection = 1;
    motorBpower.pulsewidth(0.007); // 100%
    motorApower.pulsewidth(0.01); // 100%
}

void fermo()
{
    motorBpower.pulsewidth(0); // fermo
    motorApower.pulsewidth(0); // fermo
}