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ADXL345, 3200Hz Data Ready makes ideal time interval?

Question asked by JiwonOh on Mar 20, 2015
Latest reply on Mar 31, 2015 by venkat

Hi.

 

 

I.m trying to get high sampling rate data from ADXL345.

So I set configurations as data rate as 3200Hz and receive data ready through INT1.

 

ADXL345 makes interrupt signal well, but when I measure real signal with oscilloscope.

It looks it cannot make ideal 3200Hz.

 

I count up how long takes for getting 3200 data, using count variable in ISR.

When the variable get 3200, it will stop for a while.


I only put spi read(for getting next data) and count++.

3200Hz setting can makes ideal 3200Hz signal?


In my case, only ~3050 data can delivered within 1sec. 3200 data takes about 1050ms.



Jiwon

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