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LFu.1
LFu.1
Associate II
September 16, 2021
Question

GPIO pin doesn't have output

  • September 16, 2021
  • 2 replies
  • 970 views

I configure 6 channel GPIO pins to generate PWM signals to control 3-phase bridge. There is one pin(PC13) sometimes stop to generate signal. Even we reset 3.3V power voltage, it won't recover. one time I inject 20k square wave to pin PC13 to verify other chip， but it cause the processor recovered. I use pin PA7 to sampling voltage(use as internal op-amp ）, it always has 1V even turn off 3.3V power. I am guessing because of this voltage cause the processor can't reset completely? How to explain these？

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Thanks，​

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2 replies

TDK
TDK
Super User
September 16, 2021

Sounds like there may be hardware issues going on. Pulling NRST low will reset the processor under normal scenarios.

If pins have a voltage on them while VDD is 0V, something external must be driving them high.

PC13 is special as it runs off of the low-power domain and has limited source/sink capability.

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LFu.1
LFu.1Author
Associate II
September 16, 2021

Thanks for your answer. How can we explain the processor can't get Reset properly. I guess it is because of PA7 has 1V voltage. But I am not sure. The issue didn't come up frequently. It is very hard to verify.

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