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FX3 INT# / CTL15 interrupt example | Cypress Semiconductor

FX3 INT# / CTL15 interrupt example

Summary: 1 Reply, Latest post by Madhu Sudhan on 11 Jan 2016 11:52 AM PST
Verified Answers: 0
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nia_1534961's picture
20 posts


Is there an example of how to configure the INT# / CTL15 pin to handle interrupts on the FX3?  Using GPIF II Designer I tried configuring an input signal on the INT pin, then defined a state machine that sends INTR_CPU on an INT trigger.  I do see the pin go low (Polarity -> Active Low) but never see the firmware callback function called.  What else do I need to do?

In the firmware code:

AppThread_Entry (
        uint32_t input)



  // register GPIF callback





mady's picture
Cypress Employee
964 posts


The INT Signal can be used only on a special mode of GPIF called the PP Mode. I hope you are using it in the normal mode. (Refre programmers manual for more details on PP Mode)

I recommend you to use ordinary GPIO Interrupt for your application.


- Madhu Sudhan

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