File content as of revision 2:dd33a9d29c63:

#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);
    PwmOut rled(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, ts;
        //threshold
        ts = 0.2;
        x = acc.getAccX();
        y = acc.getAccY();
        z = acc.getAccZ();
        rled = 1.0f - abs(x);
        gled = 1.0f - abs(y);
        bled = 1.0f - abs(z);
        
        // black
        rled = 1;
        gled = 1;
        bled = 1;
        
        if( abs(x) <= 1+ts && abs(x)>= 1-ts) {
            rled = 0   ;
        }
        if( abs(y) <= 1+ts && abs(y)>= 1-ts) {
            gled = 0   ;
        }
        if( abs(z) <= 1+ts && abs(z)>= 1-ts) {
            bled = 0   ;
        }
        
        if(rled == 0 && gled == 0 && bled ==1)
            pc.printf("Flat");
        else if (rled == 0 && gled == 0 && bled ==1)
            pc.printf("Flat");
        
        
        Thread::wait(300);
       pc.printf("X: %1.2f, Y: %1.2f, Z: %1.2f\n\r", x, y, z);
    }
}