Tutorial 11: LAB - External Interrupt ( EXTI ) Interfacing in STM32 using STM32CUBEMX

External Interrupt ( EXTI ) Interfacing in STM32 using STM32CUBEMX
▶️ARM Cores also support interrupts lines which are external to the core itself. These interrupt lines are usually routed to vendor specific peripherals on the MCU such as GPIO, SPI, I2C, Timers, RTC etc.
Out of these many external interrupts, some are directly connected to processor core by Nested Vector interrupt Controller (NVIC) and some are connected through called External Interrupt Controller (EXTI) block.
▶️External Interrupt Controller (EXTI) block basically handles interrupt related to GPIO and wakeup events with the help of EXTI Interrupt mask register, pending register and edge selection register. We can find IRQ numbers as well as addresses of their handler in the vector table.
EXTI Controller Features
The EXTI controller main features are the following:
➡️Independent trigger and mask on each interrupt/event line
➡️Dedicated status bit for each interrupt line
➡️Generation of up to 23 software event/interrupt requests
➡️Detection of external signal with pulse width lower than the APB2 clock period.
➡️mapping of multiple GPIO lines to 16 NVIC external interrupt inputs
➡️Dedicated status bit for external interrupt line
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[@trabajosfacu3728]

The best explanation on KZbin, you save me for my enbedded systems class, thanks!!! Greetings from Mexico

[@Hexnbit]

Greetings from India !! Thank you for your feedback. Happy to help!

[@Fr4nzB0OM]

Ohh man, you don't know how much you helped me!! You saved my life ahah. Thank's man

[@Hexnbit]

Welcome!! Happy to help!

[@TheDutchGuyOnYT]

Thx for this very clear tutorial

[@ahmetalitilkicioglu5761]

thx man you so helped me ! :D

[@Hexnbit]

Welcome!! Happy to help!

[@sugiyartosugiyarto1587]

Sir Make video timer interup...thanks🎉🎉

[@VinothkannanR-vu9yl]

for multiple ISR call back function name is same then how to use it?

[@ltlt6117]

Hi how much is the time between interrupt(falling or rising edge) and function and how we can decrease this time ? (Doing the function immediately after interrupt without any delay)

[@alanjacob.4559]

thanks you very much.

[@Hexnbit]

Welcome!!

[@edvinass3804]

Good stuff, thanks!

[@rezamalaki833]

nice

[@ahmettokay731]

Thanks man

[@Fixaj]

Nice thanks

[@Hexnbit]

Welcome!!

[@jingtingleow3974]

Is this function not available for nucleo-c031c6 because i cannot find EXTI line [15:10] interrupts checkbox in my NVIC Tab :(

[@abbasraimkulov3913]

Hi, What if we have used the 2 external interrupts? How we differentiate "HAL_GPIO_EXTI_Callback(uint16_t GPIO_Pin); " for each interrupt?

[@Hexnbit]

Based on the pin number which is given as a parameter to this callback function. If you have configured PC7 and PD8 so you have to check what is the pin number for source of interrupt and then decode the isr to be executed..

[@5245jah]

@@Hexnbitgreat answer, what about when I use mul.tiple inputs such as GPIOAPIN7 and GPIOBPIN7 ? these both have same pins

[@aravinds6698]

​@@5245jahi have the same doubt did you get any answer

[@csigabigaboca1987]

I understand the interruption method, but what can the event be used for?

[@MamathaJ987]

hello sir this is not working on NUCLEO-L053R8

[@coolchriss]

Cool❤

[@mrezamuktasib]

i want use Motor with encoder, and the encoder have Signal FG Wire that send hall signal, how do i manage it in stm32 using external intterupt? jgb37-3525

[@Hexnbit]

You can try working with timer instead of external interrupt. There is separate section for encoder interface. Try referring the example code for eval board from repository. C:\Users\User_Name\STM32Cube\Repository\STM32Cube_FW_F4_V1.27.1\Projects\STM324xG_EVAL\Examples\TIM\TIM_Encoder If you have used any custom path then you can select the path likewsie