UART error after WFI excuted

Junchuan Tan

Hello,

We found UART will not act correctly after WFI excuted. It must wait for some time after chip wakeup, then it can turn to normal. How to solve the problem?

Regards,

Jackie

over 12 years ago

0 Junchuan Tan over 12 years ago

Prodigy 150 points

Problem solved! Just set UART to work during sleep mode.

0 Petrei over 12 years ago in reply to Junchuan Tan

Guru 26105 points

Hi,

You did not specified your micro - check the errata sheet - for mine micro, for example it states a problem with waking from sleep with WFI and a special routine is recommended.

Check also the user manual - the electrical characteristics specify some delay time until wakes up.

Your solution is/could be OK if you do not exceed the power consumption (if imposed).

Petrei

Arm-based microcontrollers

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UART error after WFI excuted