File content as of revision 0:ef6b25a481a5:

#include "mbed.h"
#include "MMA8451Q.h"
#if   defined (TARGET_KL25Z) || defined (TARGET_KL46Z)
  PinName const SDA = PTE25;
  PinName const SCL = PTE24;
  #else
  #error TARGET NOT DEFINED
#endif
/*
#if   defined (TARGET_KL25Z) || defined (TARGET_KL46Z)
  PinName const SDA = PTE25;
  PinName const SCL = PTE24;
#elif defined (TARGET_KL05Z)
  PinName const SDA = PTB4;
  PinName const SCL = PTB3;
#elif defined (TARGET_K20D50M)
  PinName const SDA = PTB1;
  PinName const SCL = PTB0;
#else
  #error TARGET NOT DEFINED
#endif
*/

#define MMA8451_I2C_ADDRESS (0x1d<<1)
#define CNTRL_REG_1 0x2A
#define X_acc 0x01
#define Y_acc 0x03
#define Z_acc 0x05
#define STATUS 0x00

float conversion(char buf);

int main(void)
{
    
    I2C i2c(SDA,SCL);

    MMA8451Q acc(SDA, SCL, MMA8451_I2C_ADDRESS);
    
    int address = MMA8451_I2C_ADDRESS;
    float x, y, z;
    char stato=STATUS;
    char data_stato;
    const char X_addr=X_acc;
    const char Y_addr=Y_acc;
    const char Z_addr=Z_acc;
    char z_buffer;
    char y_buffer;
    char x_buffer;
   
    char data[2] = {CNTRL_REG_1, 0x00};
    i2c.write(address, data, 2);
    
    char data_wr_2[2]={CNTRL_REG_1, 0x3B};
    i2c.write(address,data_wr_2, 2);
    PwmOut rled(LED1);
    PwmOut gled(LED2);
    PwmOut bled(LED3);

    while (true) {
       
       i2c.write(address,&stato,1,true);
       i2c.read(address,&data_stato,1,false);
       
       if(data_stato & 8 == 8)
       {
        z = 0;
        x = 0;
        y = 0;
       i2c.write(address,&Z_addr,1,true);
       i2c.read(address,&z_buffer,1,false);
       printf("z=%d\n\r", z_buffer);
       
       
       i2c.write(address,&X_addr,1,true);
       i2c.read(address,&x_buffer,1,false);
       printf("x=%d\n\r", x_buffer);
       
       
       i2c.write(address,&Y_addr,1,true);
       i2c.read(address,&y_buffer,1,false);
       printf("y=%d\n\r", y_buffer);
       
       printf("\n\r");
       x = conversion(x_buffer);
       printf("X= %f\n\r",x);
       y = conversion(y_buffer);
       printf("Y= %f\n\r",y);
       z = conversion(z_buffer);
       printf("Z= %f\n\r",z);
       printf("\n\r");
       rled = 1.0f - abs(x);
        gled = 1.0f - abs(y);
        bled = 1.0f - abs(z);
        }
        
        
    }
}


float conversion(char buf)
{
    float val;
    if( (buf/128) >= 1)
       {
            buf -= 128; 
            val -= 128;  
        }
       
       if( (buf/64) >= 1)
       {
            buf-= 64;
            val += 64;
       }
       if( (buf/32) >= 1)
       {
            buf -=32;
            val += 32;
       }
       if( (buf/16) >= 1)
       {
            buf -=16;
            val += 16;
       }
       if( (buf/8) >= 1)
       {
            buf -=8;
            val += 8;
       }
       if( (buf/4) >= 1)
       {
            buf -= 4;
            val += 4;
       }
       if( (buf/2) >= 1)
       {
            buf -= 2;
            val += 2;
       }
       if( (buf/1) >= 1)
       {
            val+= 1;
       }
    val = (float) val/64;
    return val;
}