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Increase wait_ns test tolerance

pull/9812/head
Kevin Bracey 2019-02-26 12:49:59 +02:00
parent 91b22f8bf3
commit d2df5a03cb
1 changed files with 9 additions and 6 deletions
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15
TESTS/mbed_platform/wait_ns/main.cpp
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@ -31,13 +31,16 @@ using namespace utest::v1;
*/
/*
* Define tolerance as follows:
* Timer might be +/-5% out; wait_ns is permitted 20% slow, but not fast.
* Therefore minimum measured time should be 95% of requested, maximum should
* be 125%. Unity doesn't let us specify an asymmetric error though.
*/
* Define tolerance as follows:
* Timer might be +/-5% out; wait_ns is permitted 40% slow, but not fast.
* Therefore minimum measured time should be 95% of requested, maximum should
* be 145%. Unity doesn't let us specify an asymmetric error though.
*
* Would be nice to have tighter upper tolerance, but in practice we've seen
* a few devices unable to sustain theoretical throughput - flash wait states?
*/
#define TOLERANCE_MIN 0.95f
#define TOLERANCE_MAX 1.25f
#define TOLERANCE_MAX 1.45f
#define MIDPOINT ((TOLERANCE_MIN+TOLERANCE_MAX)/2)
#define DELTA (MIDPOINT-TOLERANCE_MIN)