File content as of revision 3:1861f741c2df:

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

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

#define MMA8451_I2C_ADDRESS (0x1d<<1)

Timer t;
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
    enum s { flat, right, up,error};
    s state=flat;

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

    while (true) {
        float x, y, z;
        double th,time1,time2,time3;
        th=0.5;
        x = acc.getAccX();
        y = acc.getAccY();
        z = acc.getAccZ();
        //rled = 1.0f - abs(x);
        //gled = 1.0f - abs(y);
        // bled = 1.0f - abs(z);
        if (z>0.5) {
            state=flat;
        } else if ((x>th)&&(abs(y)<th)&&(abs(z)<th)) {
            state=right;
        } else if ((y>th)&&(abs(x)<th)&&(abs(z)<th)) {
            state=up;
        } else {
            state=error;
        }
        switch (state) {
            case flat:
                t.start();
                gled=0;
                bled=1;
                rled=1;
                pc.printf("flat");
                t.stop();
                time1=t.read();
                t.reset();
                if (time1>=10) {
                    state=right;
                } else {
                    state=error;
                }
                break;
            case right:
                gled=1;
                bled=1;
                rled=1;
                t.start();
                pc.printf("right");
                t.stop();
                time2=t.read();
                t.reset();
                if ((time2>2)&&(time2<6)) {
                    state=up;
                } else {
                    state=error;
                }
                break;
            case up:
                gled=1;
                bled=1;
                rled=1;
                t.start();
                pc.printf("up");
                t.stop();
                time3=t.read();
                t.reset();
                if ((time3>4)&&(time3)<8) {
                    state=flat;
                } else {
                    state=error;
                }
                break;
            case error:
                printf("error");
                rled=0;
                gled=1;
                bled=1;
                break;






        }








        Thread::wait(300);
        //pc.printf("X: %1.2f, Y: %1.2f, Z: %1.2f\n \r", x, y, z);
    }
}