用Arduino ide读取ADXL355加速度计的XYZ轴数据

ADXL355用的是 ADXL355-PMDZ板，该传感器共有12个引脚。
引脚的关系如下：
1 芯片选择（SCL）；2 MOSI（SDA为I2C通信的引脚）；
3 MISO； 4 串行时钟（SCLK）；
5 接地（GND）； 6 数字电源（VCC）；
Arduino UNO R3上的引脚：
1连7,2连11,3连12,4连13.
电源接3.3V，接地直接接地。

在这里插入代码片
#include <SPI.h>

// Memory register addresses:
const int XDATA3 = 0x08;
const int XDATA2 = 0x09;
const int XDATA1 = 0x0A;
const int YDATA3 = 0x0B;
const int YDATA2 = 0x0C;
const int YDATA1 = 0x0D;
const int ZDATA3 = 0x0E;
const int ZDATA2 = 0x0F;
const int ZDATA1 = 0x10;
const int RANGE = 0x2C;
const int POWER_CTL = 0x2D;

// Device values
const int RANGE_2G = 0x01;
const int RANGE_4G = 0x02;
const int RANGE_8G = 0x03;
const int MEASURE_MODE = 0x06; // Only accelerometer

// Operations
const int READ_BYTE = 0x01;
const int WRITE_BYTE = 0x00;

// Pins used for the connection with the sensor
const int CHIP_SELECT_PIN = 7;

void setup() {
  Serial.begin(9600);
  SPI.begin();

  // Initalize the  data ready and chip select pins:
  pinMode(CHIP_SELECT_PIN, OUTPUT);

  //Configure ADXL355:
  writeRegister(RANGE, RANGE_2G); // 2G
  writeRegister(POWER_CTL, MEASURE_MODE); // Enable measure mode

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

void loop() {
  int axisAddresses[] = {XDATA1, XDATA2, XDATA3, YDATA1, YDATA2, YDATA3, ZDATA1, ZDATA2, ZDATA3};
  int axisMeasures[] = {0, 0, 0, 0, 0, 0, 0, 0, 0};
  int dataSize = 9;

  // Read accelerometer data
  readMultipleData(axisAddresses, dataSize, axisMeasures);

  // Split data
  int xdata = (axisMeasures[0] >> 4) + (axisMeasures[1] << 4) + (axisMeasures[2] << 12);
  int ydata = (axisMeasures[3] >> 4) + (axisMeasures[4] << 4) + (axisMeasures[5] << 12);
  int zdata = (axisMeasures[6] >> 4) + (axisMeasures[7] << 4) + (axisMeasures[8] << 12);
  
  // Apply two complement
  if (xdata >= 0x80000) {
    xdata = ~xdata + 1;
  }
  if (ydata >= 0x80000) {
    ydata = ~ydata + 1;
  }
  if (zdata >= 0x80000) {
    zdata = ~zdata + 1;
  }

  // Print axis
  Serial.print("X=");
  Serial.print(xdata);
  Serial.print("\t");
  
  Serial.print("Y=");
  Serial.print(ydata);
  Serial.print("\t");

  Serial.print("Z=");
  Serial.print(zdata);
  Serial.print("\n");

  // Next data in 100 milliseconds
  delay(100);
}

/* 
 * Write registry in specific device address
 */
void writeRegister(byte thisRegister, byte thisValue) {
  byte dataToSend = (thisRegister << 1) | WRITE_BYTE;
  digitalWrite(CHIP_SELECT_PIN, LOW);
  SPI.transfer(dataToSend);
  SPI.transfer(thisValue);
  digitalWrite(CHIP_SELECT_PIN, HIGH);
}

/* 
 * Read registry in specific device address
 */
unsigned int readRegistry(byte thisRegister) {
  unsigned int result = 0;
  byte dataToSend = (thisRegister << 1) | READ_BYTE;

  digitalWrite(CHIP_SELECT_PIN, LOW);
  SPI.transfer(dataToSend);
  result = SPI.transfer(0x00);
  digitalWrite(CHIP_SELECT_PIN, HIGH);
  return result;
}

/* 
 * Read multiple registries
 */
void readMultipleData(int *addresses, int dataSize, int *readedData) {
  digitalWrite(CHIP_SELECT_PIN, LOW);
  for(int i = 0; i < dataSize; i = i + 1) {
    byte dataToSend = (addresses[i] << 1) | READ_BYTE;
    SPI.transfer(dataToSend);
    readedData[i] = SPI.transfer(0x00);
  }
  digitalWrite(CHIP_SELECT_PIN, HIGH);
}

接上之后，就能在串口上看到数据了。如图：