GPIOS: Read pins with different interrupts

Read two pins with interrupts on falling edges, both pins has different vector interrupts.

In this case one pin has its corresponding vector interrupt in EXTI4_15_IRQn but the other one is in EXTI2_3_IRQn, the reason, well basically is the way the microcontroller has rooted the interrupts. But keep in mind they both calls the same callback

#include "bsp.h"

int main( void )
{
    GPIO_InitTypeDef GPIO_InitStruct;               /*gpios initial structure*/
    
    HAL_Init();                                     /*Init HAL library*/
    __HAL_RCC_GPIOB_CLK_ENABLE();                   /*Enable clock on port B*/
  
    GPIO_InitStruct.Pin = GPIO_PIN_3 | GPIO_PIN_4;   /*pins to set as output*/
    GPIO_InitStruct.Mode = GPIO_MODE_IT_FALLING;    /*input mode with interrupts enable on falling edge*/
    GPIO_InitStruct.Pull = GPIO_NOPULL;             /*no pull-up niether pull-down*/
    GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;    /*pin speed*/
    /*use the previous parameters to set configuration on pin B5*/
    HAL_GPIO_Init( GPIOB, &GPIO_InitStruct );

    /*Enable interrupt vector EXTI4_15_IRQ where the CPU will jump if a input change
    happens on pins 4 to 15*/
    HAL_NVIC_SetPriority( EXTI4_15_IRQn, 2, 0 ); /*set to the lowest of the four priorities*/
    HAL_NVIC_EnableIRQ( EXTI4_15_IRQn );

    /*Enable interrupt vector EXTI2_3_IRQ where the CPU will jump if a input change
    happens on pins 2 or 3*/
    HAL_NVIC_SetPriority( EXTI2_3_IRQn, 2, 0 ); /*set to the lowest of the four priorities*/
    HAL_NVIC_EnableIRQ( EXTI2_3_IRQn );
    
    while (1)
    {
        
    }
}

/* Even thou both pins has a differente ISR vectors both of them calls HAL_GPIO_EXTI_IRQHandler
from the EXTI4_15_IRQHandler or EXTI2_3_IRQHandler interrupt vectors*/
void HAL_GPIO_EXTI_Falling_Callback( uint16_t GPIO_Pin )
{
    /*since the library only has a common function to attend both interrupt vectors we still 
    need to see which one causes the interrupt*/
    if( GPIO_Pin == GPIO_PIN_3 )
    {
        /*if the change was on pin 3, do something*/
    }
    if( GPIO_Pin == GPIO_PIN_4 )
    {
        /*if the change was on pin 4, do something*/
    }   
}

ints.c

In this example we need to use different vectors

/*Declare interrupt service rutine as it is declare in startup_stm32g0b1xx.s file*/
void EXTI2_3_IRQHandler( void )
{
    /*HAL library fucntions that attend interrupt on inputs*/
    HAL_GPIO_EXTI_IRQHandler( GPIO_PIN_3 );
}

/*Declare interrupt service rutine as it is declare in startup_stm32g0b1xx.s file*/
void EXTI4_15_IRQHandler( void )
{
    /*HAL library fucntions that attend interrupt on inputs*/
    HAL_GPIO_EXTI_IRQHandler( GPIO_PIN_4 );
}