GPIOS: Read pin with interrupts

Read a pin using interrupts on edge detection

Since pin 5 is been used it is necessary to enable the vector interrupt corresponding that pin, ion this particular case is the one identified by EXTI4_15_IRQn and both callback function are in use

#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_5;               /*pin to set as output*/
    GPIO_InitStruct.Mode = GPIO_MODE_IT_RISING_FALLING;    /*input mode with interrupts enable on falling and rising edges*/
    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 );

    while (1)
    {
        
    }
}

/* when the pin changes from high to low this function will be called by HAL_GPIO_EXTI_IRQHandler
which is in turn called from the EXTI4_15_IRQHandler interrupt vector*/
void HAL_GPIO_EXTI_Falling_Callback( uint16_t GPIO_Pin )
{
    /*do something while still in the ISR, the parameter GPIO_Pin
    received by the callback function can be use to corroborate
    the pin that cause the interrupt*/    
}

/* when the pin changes from low to high this function will be called by HAL_GPIO_EXTI_IRQHandler
which is in turn called from the EXTI4_15_IRQHandler interrupt vector*/
void HAL_GPIO_EXTI_Rising_Callback( uint16_t GPIO_Pin )
{
    /*do something while still in the ISR, the parameter GPIO_Pin
    received by the callback function can be use to corroborate
    the pin that cause the interrupt*/*/
}

ints.c

/*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_5 );
}