https://dkeemin.com/stm32f4-ll-i2c-%ec%84%a4%ec%a0%95-%eb%b0%8f-adxl345-%eb%a0%88%ec%a7%80%ec%8a%a4%ed%84%b0-%ec%82%b4%ed%8e%b4%eb%b3%b4%ea%b8%b0/
ADXL345 I2C 설정 및 레지스터 살펴보기