All EXTIs triggered at same time

[RafaelSTM32]

I configured the EXTIs for 16 inputs from PD0 to PD15, rising and falling edge, IRQ1 for PD0, IRQ2 por PD1, and so on as must be for groups 5-9 and 10-15 IRQ Handler. I debug the program with a breakpoint in each EXTI_IRQ_HANDLER and all of them are activated when I press a button. I found the behavior of the callback because of this but I do not know the cause.

[Sarra.S]

Hello @RafaelSTM32, 

it would be helpful if you could share the code snippet for the EXTI_IRQ_HANDLER functions and the callback function. 

Also, what is the need to use 16 EXTIs?

[TDK]

Check for the appropriate flags in the EXTI->PR register. All pins have their own interrupt flag. HAL does this for you and will provide the GPIO_Pin that triggered the interrupt.

Look at HAL_EXTI_IRQHandler for inspiration.

https://github.com/STMicroelectronics/STM32CubeF7/blob/043626d52e34ee8146588bae597513398683e329/Drivers/STM32F7xx_HAL_Driver/Src/stm32f7xx_hal_exti.c#L434C52-L434C52

[waclawek.jan · Accepted solution]

> when I press a button

What button? What exactly is the hardware? Can you post a photo? Can't it be that that button indeed causes a pulse on all pins of PD (e.g. through inadequate common ground)?

JW

[RafaelSTM32]

Thank you for your ideas, I got a new path because of you to look for and I found when I press a button it's created an spike that triggers to all inputs EXTIs, I'll look for a mistake or something in the hardware. I got an oscilloscope to do this, I need to buy one.

[RafaelSTM32]

the need for the EXTIs is because I am doing a logger for all inputs, I need to detect when an input is activated and deactivated

[waclawek.jan]

> I found when I press a button it's created an spike that triggers to all inputs EXTIs

Post relevant portion of schematics, and a photo of your setup.

JW

[RafaelSTM32]

Hi, I found a broken track in my pcb, it looked fine when I tested with a multimeter for continuity but when I pressed a button the force applied opened the track and isolated the ground connection of my debounce capacitors giving an spike in almost all inputs 

 

[RafaelSTM32]

Thanks a lot people!!! your advices make me find the fail very fast!!!

[RafaelSTM32]

this is my project!!