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Problem pulse length measurement #2500

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ChrisDorna opened this issue Oct 30, 2019 · 3 comments
Closed

Problem pulse length measurement #2500

ChrisDorna opened this issue Oct 30, 2019 · 3 comments
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bug P2 serial

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@ChrisDorna
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Describe the bug
We discovered that the value measured is consequently 2/3 of the actual pulse width.

To Reproduce
plaatje

Expected behavior
Show right pulse lenght

Additional context
Joe Finney had already a look on this issue and answered:
OK… That particular makeCode block (pulseIn) isn’t implemented using our DAL interrupt based code for this – instead it’s using its own software implementation shown below.

This would explain some of the jitter, but not the undershoot. Perhaps the system timer is running slow… but surely we would have noticed if it were so slow…
plaatje 2
@martinwork
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lancaster-university/microbit-dal#451 might be relevant.

@pelikhan
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pelikhan commented Nov 10, 2020 •
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v2 fix in #3642

@abchatra
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fixed

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bug P2 serial
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@martinwork @pelikhan @abchatra @ChrisDorna