#include <stdio.h>
#include <stdint.h>
#include <unistd.h>
#include <fcntl.h>

struct Sample{
    int16_t x;
    int16_t y;
    int16_t z;
};

int main(){

    int fd;
    unsigned char buf[64];
    size_t count = 6;
    ssize_t ret_size;
    struct Sample sample;


    if((fd = open("/dev/adxl345", O_RDWR)) == -1){
        printf("/dev/adxl345 opening failed\n");
        return(0);
    }
    else{

        for(int i=0; i<100; i++){
            if((ret_size = read(fd, &buf, count)) < 0){
                printf("Error while reading the device file.\n");
                return(1);
            }
            else if(ret_size < count){
                printf(".");
            }
            else{
                sample.x = (int16_t)(buf[1]<<8 | buf[0]);
                sample.y = (int16_t)(buf[3]<<8 | buf[2]);
                sample.z = (int16_t)(buf[5]<<8 | buf[4]);

                printf("Sample %i: %i %i %i\n",i,sample.x,sample.y,sample.z);
            }
        }
    }
    return(0);
}