LIS3DH加速度数据输出分辨率是12位

1）问题1我正在阅读LIS3DH AN3308的数据表。我怀疑3.2.3的描述（加速数据的例子）。

350（0x15E）mg寄存器数据为Val_0x29 = 0x15，Val_0x28 = E0（左对齐）
BLE没问题
1g（0x400mg）寄存器数据为Val_0x29 = 0x04，Val_0x28 = 0x00
这是正确的例子吗？我认为它应该是Val_0x29 = 0x40，Val_0x28 = 0x00

2）我从st.com下载LIS3DH驱动程序代码
stsw-mems023_LIS3DH Linux OS设备driver.zip

获取加速数据代码如下，
acc_data [0] =（AXISDATA_REG）;
err = lis3dh_acc_i2c_read（stat，acc_data，6）;

hw_d [0] =（（（s16）（（acc_data [1]＆lt;＆lt; 8）| acc_data [0]））＆gt;＆gt; 4）;
hw_d [1] =（（（s16）（（acc_data [3]＆lt;＆lt; 8）| acc_data [2]））＆gt;＆gt; 4）;
hw_d [2] =（（（s16）（（acc_data [5]＆lt;＆lt; 8）| acc_data [4]））＆gt;＆gt; 4）;
实际上，输出分辨率是12位，而不是16位???
我在LIS2DH数据表中找到了输出分辨率描述
但是没有在LIS3DH，AN3308中找到
3.2.1数据对齐
加速度数据表示为16位数字并且左对齐。

谢谢

＃lis3dh数据格式变换



以下为原文




1) Question1 I am reading the the data sheet of LIS3DH AN3308.  I doubt about the description of 3.2.3(Example of accleration data).

350(0x15E)mg register data is Val_0x29 = 0x15, Val_0x28 = E0 (left-justified)
It is OK of BLE
1g(0x400mg) register data is Val_0x29 = 0x04, Val_0x28 = 0x00
Is it correct example?? I think it should be  Val_0x29 = 0x40, Val_0x28 = 0x00

2) I download LIS3DH driver code from st.com  
stsw-mems023_LIS3DH Linux OS device driver.zip

the get acceleration data code is as the following,
acc_data[0] = (AXISDATA_REG);  
err = lis3dh_acc_i2c_read(stat, acc_data, 6);

hw_d[0] = (((s16) ((acc_data[1] << 8) | acc_data[0])) >> 4);
hw_d[1] = (((s16) ((acc_data[3] << 8) | acc_data[2])) >> 4);
hw_d[2] = (((s16) ((acc_data[5] << 8) | acc_data[4])) >> 4);
In fact, the output resolution is 12bit, not 16bit ???
I found the output resolution description at LIS2DH data sheet
But not found at LIS3DH, In AN3308
3.2.1 Data alignment
    Acceleration data are represented as 16-bit numbers and are left justified.

Thanks
   
#lis3dh-data-format