[lis3dx] What should the FSS[4:0] be valued when the fifo is full

[Kefei Yao]

Posted on March 20, 2018 at 07:43

FSS[4:0] contains the unread samples stored in the FIFO. So when the EMPTY is 1, the FSS[4:0] is 0. But when the OVRN_FIFO is 1, the FSS[4:0] should be 32 but it can't. So when 

FSS[4:0] is 31 we should check the OVRN_FIFO flag to judge the real unread sample number. Is that correct?

[Winfred LU · Accepted solution]

Posted on March 20, 2018 at 09:39

Hi Kefei,

Correct. Reference the below table:

• OVRN=0, FSS=11111  --> Unread FIFO samples = 31
• OVRN=1, FSS=11111  -->

   Unread FIFO samples = 32

   

Best Regards,

Winfred

[Kefei Yao]

Posted on March 20, 2018 at 09:48

Thank you very much.