File content as of revision 2:049f61b9ebcb:

#include "mbed.h"

DigitalOut led(LED_RED);
DigitalOut led2(LED_BLUE);
DigitalIn sw2(SW2);
InterruptIn sw3(SW3);
Serial pc(USBTX, USBRX);
int n = 0;


void SwitchN() {
    n++;
    }

int main()
{
  pc.baud(115200);


  
  while (true) {
        sw3.fall(&SwitchN);
        
char c = pc.getc();    
    
    
    
    
    
    switch (c) 
    {
        case 's': 
        {
            if (n%2 == 0) 
            {
              pc.printf("up \n\r");  
            } 
            else
            { 
                pc.printf("right \n\r");
            }
            break;
        }
        case 'd': 
        {
            if (n%2 == 0) 
            {
              pc.printf("down \n\r");              } 
            else
            { 
                pc.printf("left \n\r");
            }
            break;
        
        }
    }
    
}
}