File content as of revision 2:589ab4e1c22e:

#include "mbed.h"
#include "rtos.h"
#include "MMA8451Q.h"

  PinName const SDA = PTE25;
  PinName const SCL = PTE24;

#define MMA8451_I2C_ADDRESS (0x1d<<1)

int main(void)
{
    MMA8451Q acc(SDA, SCL, MMA8451_I2C_ADDRESS);
    DigitalOut led1(LED1);
    DigitalOut led2(LED1);
    DigitalOut led3(LED1);
    PwmOut gled(LED2);
    PwmOut bled(LED3);
    Serial pc(USBTX, USBRX); // tx, rx
    



    pc.printf("MMA8451 ID: %d\n", acc.getWhoAmI());

    while (true) {
        float x, y, z;
        float errorrange = 0.05;
        float threshold = 0.2;
        int filter = 4;
        int countflag = 0;
        //int entry = 0;
       
        
        x = acc.getAccX();
        y = acc.getAccY();
        z = acc.getAccZ();
       
        Thread::wait(300);
        pc.printf("X: %1.2f, Y: %1.2f, Z: %1.2f\n\r", x, y, z);
        
        if ((abs((x+y+z)-1))<threshold)
        {
            if ((abs(z-1)<=errorrange))
            {
                if (countflag == 0)
                {
                    pc.printf("flat");
                    countflag = filter;
                    led1= 1;
                    led2=1;
                    led3 =0;
                    
                   
                }
                else
                {
                    countflag--;
                }
            } 
            
            if (abs(x-1)<=errorrange)
            {
                if (countflag == 0)
                {
                    pc.printf("left");
                    countflag = filter;
                     led1= 1;
                    led2=0;
                    led3 =1;
                    
                }
                else
                {
                    countflag--;
                }
            } 
            
             if (abs(x+1.0f)<=errorrange)
            {
                if (countflag == 0)
                {
                    pc.printf("right");
                    countflag = filter;
                    led1= 0;
                    led2=1;
                    led3 =1;
                   
                }
                else
                {
                    countflag--;
                }
            }   
               
        
        } 
        
    }
}