前面已经说了ADXL345的初始化，那么接下来就该读取ADXL345的数据了。ADXL345的数据装载在0x32-0x37的6个寄存器里，分别是XYZ轴的数据。

数据怎么转换为g 或者mg呢，也很简单，计算公式如下：

*采样值（g）

实际计算时可以做一些简化

static unsigned char       DataX1, DataX2, DataY1, DataY2, DataZ1, DataZ2;      //xyz的高低字节

static unsigned  int       DataX, DataY, DataZ;  //X Y Z的数据

static unsigned char   Interrupt;

void display_adxl345_data(unsigned int x)

{ 

//      unsigned int x;

         unsigned long    y;

         if((x&0xf000)==0xf000)    //是负数

         {

                   uartPutc('-') ; //显示符号位

                   x = ~x;                         //按位取反

         }

         x &= 0xffff;

         y=x*39;

         uartPutdouble(y);

}

void ADXL345_Test(void)

{

                            Interrupt=(unsigned char)read_adxl345_reg(0x30);       // get interrupt status                                                                                        

                            if((Interrupt&0x80)==0x80)     // Data Rdy interrupt,    get X Y Z data for shake and rotate function

                            {

                                     DataX1=(unsigned char)read_adxl345_reg(0x32);

                                     DataX2=(unsigned char)read_adxl345_reg(0x33);

                                     DataY1=(unsigned char)read_adxl345_reg(0x34);

                                     DataY2=(unsigned char)read_adxl345_reg(0x35);

                                     DataZ1=(unsigned char)read_adxl345_reg(0x36);

                                     DataZ2=(unsigned char)read_adxl345_reg(0x37);

                                     DataX=DataX2;

                                     DataX=(DataX<<8) | DataX1;

                                     DataY=DataY2;

                                     DataY=(DataY<<8) | DataY1;

                                     DataZ=DataZ2;

                                     DataZ=(DataZ<<8) | DataZ1;

                                     uartPuts("X=:");                        display_adxl345_data(DataX);        

                                     uartPuts("  mg     Y=:"); display_adxl345_data(DataY);

                                     uartPuts("  mg     Z=:"); display_adxl345_data(DataZ);

                                     uartPuts("  mg     \r\n");

                           }

}       

晃动小板子，就会发现数据有变化了，

静止情况下，读取的数据和下图对应，那么板子基本上就调好了。