GPIO Interrupt

[Sri_Nishanth]

Is it possible to disable a specific GPIO interrupt in my code and re-enable it after some time. HAL_NVIC_DisableIRQ(EXTI4_15_IRQn) this function will help but this will disable all the GPIO pins connected to that particular EXTI line. Any other possible ways I can implement?

[waclawek.jan]

Which STM32?

In most STM32 the individual EXTI interrupts are enabled/disabled in the EXTI_IMR register, see EXTI chapter in Reference Manual (RM).

JW

[Sri_Nishanth]

Hi @waclawek.jan

I am using STM32G474RCT6 controller.

Should I need to make changes in the EXTI_IMR register. Or are there any HAL functions I can use to Implement this. Currently I could be able to disable EXTI15_10_IRQn which disables all the GPIOs connected to this line.

[waclawek.jan]

I don't use Cube/HAL.

I've seen in the past users to perform the same operation as when initializing the pin, just without the interrupt being set.

JW

[FBL]

Hello @Sri_Nishanth 

According to the reference manual, EXTI line dedicated to 10->15 are regrouped in one vector in NVIC controller. So, using CMSIS, this should not be possible. Maybe, we can implement this operation in HAL driver using directly EXTI_IMR. I will forward the request to dedicated team. 

[Sri_Nishanth]

Hi @FBL 

Okay sure.

Thanks for the help!!

[Pavel A. · Accepted solution]

You can use LL_EXTI_EnableIT_0_31()  and  LL_EXTI_DisableIT_0_31() 

[Sri_Nishanth]

Thanks!!

This worked:grinning_face::handshake:

[Ed Peguillan III]

Thanks for the solution. When calling for example:

LL_EXTI_EnableIT_0_31(uint32_t EXTI_Line);

how do the individual "EXTI_Line"s map to specific GPIO ports and pins? I see "lines" referenced in the reference manual, but I don't understand the mapping.

EDIT: I may have found the mapping on page 271. It seems that, for example:

LL_EXTI_Disable_IT_0_31(LL_EXTI_LINE_3);

will disable the interrupts on pin 3 of ALL ports. Is that right?

[waclawek.jan]

These are two different things.

First comes the multiplexer controlled by SYSCFG register, which selects, which port's pin is used for that particular EXTIn, n = 0..15.

Then output of that multiplexer enters EXTI module and you can then there enable/disable individual EXTI in the EXTI_IMR register, see EXTI chapter in Reference Manual (RM). That's what those LL functions/macros do.

Cube/LL is open source, so you can look up yourself what the macros/functions do.

JW