[GitHub] jacobrosenthal commented on issue #1088: fix self test

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jacobrosenthal commented on issue #1088: fix self test
URL: https://github.com/apache/mynewt-core/pull/1088#issuecomment-390524343
 
 
   As I posted inline comments, this fails on my lis2ds12 (altered for my register set)
   
   I cant find anything that does a rolling average across both positive and negative, and which doesnt take a static reading first as your code implements here. Do you have a link?
   
   Some research from trawling ST support forums
   
   This is probably the best indication of how its supposed to work. Note  2G not 4G, and I think we need to discard data and average both the static and self test data. This doesnt mention the positive vs negative, but it seems wed just do it once for each against the same static data set.
   https://community.st.com/thread/45621-self-test-for-iis2dh-accelerometer-always-failing#comment-177225
   
   Again Everything I can find says you should be testing in 2G
   https://community.st.com/thread/46017-lis12dh12tr-self-test-values#comment-178877
   
   A fairly clear formula, abs value the average of the difference of the static and self test readings.
   https://community.st.com/thread/45171-lsm6ds33-problem-with-self-test#comment-175266
   
   More  chatter about discarding self test samples.
   https://community.st.com/thread/39822-lis2dh-minimum-delay-between-commands-during-self-test#comment-152736
   
   
   

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