EVM430-FR6047: USS library error 135 and lock up (DToF - Shift value was greater than maxSampleShift) at rapid flow change

Dmitry Egorov

Part Number: EVM430-FR6047

Hi everyone,

We are having troubles with the TI's USS library running on a EVM430-FR6047 - based 2 channel flow meter design.

When the flow rate changes rapidly (ex, rapid 20% transient from 10% of max flow to 30% of max flow) , we are getting error 135 (DToF - Shift value was greater than maxSampleShift).

What this happens, error 135 does not go away by itself, it outputs zero flow and the only way is to reset the algorithm completely by rebooting. This is of course not acceptable.

Could someone suggest what causes error 135 and how to recover from it without reboot ?

Thanks

Dmitry

over 3 years ago

0 Johnson He over 3 years ago

TI__Mastermind 28516 points

Hi Dmitry,

You can change this parameter to fix this error when flow rate changes rapidly

Thanks!

Best Regards

Johnson

0 Felipe Garay over 3 years ago

Prodigy 110 points

Hi Dmitry,

I was wondering if you solved your issue?

I´m having the same behavior in my meter, it locks in code error 135 and it doesn´t give me any flow rate until I change the flow, but suddenly it comes back to same behavior.

0 Johnson He over 3 years ago in reply to Felipe Garay

TI__Mastermind 28516 points

Hi Felipe,

Does your issue have been resolved?

Thanks!

Best Regards

Johnson

0 Felipe Garay over 3 years ago in reply to Johnson He

Prodigy 110 points

Hi,

I´m sorry for the delay,

I've been modifying gain value and ADC time capture, and fortunately I have not found the error anymore.

Thanks for you answer.

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EVM430-FR6047: USS library error 135 and lock up (DToF - Shift value was greater than maxSampleShift) at rapid flow change