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Interrupts

Started by michel capua, Aug 11 2013 07:05 AM

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#1 michel capua

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Posted 11 August 2013 - 07:05 AM

Is it possible use all the GPIO with a different interrupt?

How many interrupts are possible with NP2?

#2 hanzibal

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Posted 13 August 2013 - 10:21 AM

The STM32F405xx datasheet says "Up to 140 I/O ports with interrupt capability" depending on package:

http://www.st.com/st.../DM00037051.pdf

They don't explicitly say that you can enable interrupts on all ports simultaneously and I strongly doubt you can.

The reference manual says the interrupt controller has 82 interrupt vectors:

http://www.st.com/we.../DM00031020.pdf

Since the interrupt vector table only has 82 entries of which many are used by peripherals, there's no way all GPIOs can be configured for external interrupts. This is confirmed in chapter 10.2.5 that says there are 16 external interrupts.

The NP2 has has a maximum of 22 GPIOs and it seems only any 16 of these can be used with interrupts.