IIS3DHHC

#include <SPI.h>;

const int slaveSelectPin = 10;
const int FIFO_CTRL = 0x2E; //FIFO control register
const int CTRL_REG1 = 0x20; //FIFO control register 1
const int CTRL_REG4 = 0x23; //FIFO control register 4
const int INT1_CTRL = 0x21; //INT1 pin control register
const int STATUS = 0x27; //Status register
const int WHO_AM_I = 0x0F; //
const int OUT_X_L = 0x28; // OUT_X_L
const int OUT_X_H = 0x29; // OUT_X_H
const int OUT_Y_L = 0x2A; // OUT_Y_L
const int OUT_Y_H = 0x2B; // OUT_Y_H
const int OUT_Z_L = 0x2C; // OUT_Z_L
const int OUT_Z_H = 0x2D; // OUT_Z_H

void setup() {
  Serial.begin(115200);
  SPI.beginTransaction(SPISettings(14000000, MSBFIRST, SPI_MODE0))
  delay(2000);
  SPI.begin();
  pinMode (slaveSelectPin, OUTPUT);
  digitalWrite(slaveSelectPin, HIGH);

  /* Initialization */
  writeRegister(CTRL_REG1, 0xC0); // enables Normal mode and auto-increment
  writeRegister(CTRL_REG4, 0x01); // enables embedded temperature compensation
  writeRegister(INT1_CTRL, 0x80); // Data-ready interrupt on INT1 pin
  writeRegister(FIFO_CTRL, 0xC0); // FIFO mode continuous: if the FIFO is full, the new sample overwrites the older sample */

  delay(100); //give the sensor time to set up
}

void loop() {
  readFIFO();
  delay(25);
}

void readFIFO (){
  //FIFO stores 3 bytes of data for each axis (OUT_X, OUT_Y, OUT_Z)
  /* retrieving data from the FIFO
  reading the output registers (28h to 2Dh) returns the oldest FIFO sample set
  32 reads of 6 bytes
   */
  if (readRegister(STATUS) == 0x8) {   //read status STATUS 00000000 (0x0) if 00001000 (0x8) then continue;
    readRegister(OUT_X_L);
    Serial.println(readRegister(OUT_X_H));
    //readRegister(OUT_Y_L);
    //readRegister(OUT_Y_H);
    //readRegister(OUT_Z_L);
    //readRegister(OUT_Z_H);
  }
  //Data processing
  //Goto read status
  SPI.endTransaction();
}

byte readRegister (byte thisRegister){
    byte inByte = 0;
    digitalWrite(slaveSelectPin, LOW);
    SPI.transfer((thisRegister << 1) | 1);
    inByte = SPI.transfer(0x00);
    digitalWrite(slaveSelectPin, HIGH);
    return inByte;
}

void writeRegister (byte thisRegister, byte value){
    digitalWrite(slaveSelectPin, LOW);
    SPI.transfer(thisRegister << 1);
    SPI.transfer(value);
    digitalWrite(slaveSelectPin, HIGH);
}