Linux/AM3358: Reading a digital tachometer output

Brian Weir

Part Number: AM3358

Tool/software: Linux

We would like to be able to read and display the actual RPM of the fan. But, more importantly be able to use a some time / counter to post an interrupt when the fan's speed is out of tolerance (either to slow or too fast). We currently have the fan tach output pulled up to 3.3v and connected to a Timer7 input. Is there a better way of doing this?

Thanks again my TI friends!

Best Regards,

Brian Weir

over 8 years ago

0 Biser Gatchev-XID over 8 years ago

TI__Guru**** 393215 points

Hi,

From what you describe this would be either a DMTimer input or an PWMSS eCAP input.

0 Brian Weir over 8 years ago in reply to Biser Gatchev-XID

Intellectual 810 points

Thank you Biser, Per your suggestion we will stick with a DMTimer (Timer7) that we currently have in our design. Could you direct us to any programming examples that would help us get this fan tach working:

Best Regards,
Brian

0 Biser Gatchev-XID over 8 years ago in reply to Brian Weir

TI__Guru**** 393215 points

I'm afraid we cannot help on this. This is application software, which is beyond the scope of support on this forum.

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Linux/AM3358: Reading a digital tachometer output