Which IRQn is used for each EXTI Line?

[epalaima]

Posted on February 06, 2017 at 04:13

Hi, I am working on a project using EXTI interrupts from the GPIO pins on the STM32F303 Discovery Board. I am using the STM32F03x_StdPeriph_Driver and CMSIS libraries. 

In these libraries EXTI 1-16 are defined, while for the EXTI IRQn interrupt handlers 0-4 are defined, as well as 9_5 and 15_10. Which interrupt handler is meant to work with each EXTI Line? Is it possible to have the 9_5 line handle interrupts from multiple lines? Say from both 6 and 7? 

#handler #exti #interrupt #irqn

[john doe]

Posted on February 06, 2017 at 06:14

the irq handlers in the libraries are configured to handle the irqs of the chip

where you see irq handler for 0-4, et al, that means in your callback routine, you need to determine which irq was called so you can handle them individually, despite the callback handling multiple irq.

[Self.Glenn]

Posted on February 06, 2017 at 07:03

In your interrupt service routine you would do something like this:

void EXTI15_10_IRQHandler (void)

{

//test for exti13 and 14

if (EXTI_GetITStatus(EXTI_LINE13) != RESET)

{

//process EXTI13 events

EXTI_ClearITPendingBit(EXTI_LINE13); //clear the interrupt flag

}

if (EXTI_GetITStatus(EXTI_LINE14) != RESET)

{

//process EXTI14 events

EXTI_ClearITPendingBit(EXTI_LINE14); //clear the interrupt flag

}

}

Glenn