Low-Level Driver

[prsh]

Hello

I have been working on some project which require external interrupt (EXTI). It is a custom PCB with stm32L476vgtx MCU. I am able to verify interrupt via HAL library but unable to do so with the LL driver library. I have used the repository example to do so but no luck. I have never worked with LL drivers before, so anyone could please guide me what could possibly go wrong. I have only changed the pin configuration mentioned in the example, nothing else.

Thanks in advance!

[TDK]

Probably you aren't using the correct EXTI callback. The interrupt handler name is different for different pins. Show your code, what did you change specifically?

[waclawek.jan]

Read out and check content of EXTI registers.

Some generic "interrupt does not work" debugging hints here.

JW

@TDK, EXTI callback? Does Cube/LL use the same unified-driver-then-callback mechanism as Cube/HAL?

[prsh]

EXTI15_10_IRQHandler as callback function.

#define USER_BUTTON_IRQHANDLER EXTI15_10_IRQHandler

void USER_BUTTON_IRQHANDLER(void)
{
/* Manage Flags */
if(LL_EXTI_IsActiveFlag_0_31(USER_BUTTON_EXTI_LINE) != RESET)
{
LL_EXTI_ClearFlag_0_31(USER_BUTTON_EXTI_LINE);

/* Manage code in main.c.*/
UserButton_Callback();
}
}

[prsh]

The same hardware is working fine with HAL library. Been using the same port/pin which is working with HAL.

[TDK]

LL doesn't have a unified callback like HAL, it just puts code in the IRQ handler itself (as below).

[TDK]

And what is USER_BUTTON_EXTI_LINE? Is it a pin between 10 and 15? If not, callback will be different.

[prsh]

PE11 as EXTI.

[waclawek.jan]

Is PE11 selected as EXTI11 input in respective SYSCFG_EXTICRx?

JW

[prsh]

Yes it is.