FIFO定时错误

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LIS3DH：
http://www.st.com/internet/analog/product/250725.jsp
 
 
我正面临着FIFO模式下lis3dh加速度计的计时问题。目前我的ODR = 25 Hz并且我正在读取水印阈值= 30的FIFO。一旦我得到水印中断，我就会在5 Mhz读取196（32 * 3 * 2）个样本.Hence我在下一个ODR采样时间= 0.04秒（1/25）之前清除整个FIFO。
 
 
 
 
然而，在两分钟之后，我处于一秒的正偏移。这是由于加速度计时间的不准确吗？
 
 
 
 
我们的应用要求所有FIFO数据在2分钟内可用。
 
 
您能否告诉我们如何才能获得正确的定时数据？



以下为原文







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LIS3DH:
http://www.st.com/internet/analog/product/250725.jsp



I am facing timing issue with lis3dh accelerometer in FIFO mode.Currently my ODR=25 Hz and I am reading FIFO on watermark threshold=30.As soon as I get watermark interrupt I read 196 (32*3*2)samples at 5 Mhz.Hence I clear the entire FIFO before the next ODR sample time=0.04seconds(1/25).





However after two minutes I am at an positive offset of one second.Is this due to inaccuracies in the accelerometer timing ?





Our application requires that all the FIFO data to be available at precisely 2 minutes.


Can you please tell us what can we do to achieve correct timed data.