Port from GPIO_PIN_#, or how to tell pins apart in a callback?

Forum|Forum|9 years ago
June 10, 2017
4 replies
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Posted on June 10, 2017 at 21:18

Let us say for the purposes of discussion that I have external interrupts on PA08 and PB08. The callback is passed a pin address. How do I tell them apart if they're both the same pin number on different ports? Or does this just not come up and its a bit fumbling amateur question.

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Tesla DeLorean

Guru

Posted on June 10, 2017 at 21:32

The EXTI implementations I'm aware of permit only one pin 8 (Px8) input at a time

You might be able to create a similar effect with a TIM using input-capture.

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john doeAuthor

Senior III

Posted on June 11, 2017 at 00:02

ok, so we'll chalk this one up to an stm32 hardware limitation regarding its nvic and/or timer/counter implementation

Tesla DeLorean

Guru

Posted on June 11, 2017 at 16:17

In this case specifically the EXTI and the gating of pin sources.

Like I said External Interrupts, in the classical sense, can also be implemented via TIMx_CHx inputs. The hardware time-stamp allows for a determination of which fired first, and also accurate understanding of placement with indeterminate latency of the interrupt(s).

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