[riot-notifications] [RIOT-OS/RIOT] tests/posix_semaphore: add (lack of) fe310 timer accuracy workaround (#11377)
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Thu Apr 11 15:37:25 CEST 2019
### Contribution description
On hifive1, the test runs slightly longer than the default allows. This is probably caused by the board using a 32kHz timer as base for xtimer. This PR adds a workaround (allow up to 250usec/sec too long) only for the FE310 cpu.
### Testing procedure
- assert validity of fix
- see #11041 passing the test on all boards including hifive1
### Issues/PRs references
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-- Commit Summary --
* tests/posix_semaphore: add (lack of) fe310 timer accuracy workaround
-- File Changes --
M tests/posix_semaphore/main.c (7)
-- Patch Links --
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