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Abnormal period values when using eMIOS IPM mode

Question asked by 雄 苏 on Feb 13, 2019
Latest reply on Feb 15, 2019 by 雄 苏

Hi,

I want to use 5748G to control a pwm fan . And i configured an eMIOS channel as IPM mode to measure the fan's speed. Sadly the period calculated by the IPM seems not quite right. I found someabnormal values, and the longer the period is, the more abnormal values are. So please help me to fix it.

 

There are some codes from my application:

emios.c

 

main

 

And there are some results: 

 

when period = 24000 us

 

when period = 12000 us

 

when period = 1000 us

 

when period = 50 us

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