#include <stdint.h>
#include <stm32h747xx.h>

#ifndef EXTI_H
#define EXTI_H

typedef struct {
  EXTI_TypeDef* exti;
  SYSCFG_TypeDef* syscfg;
} exti_t;

exti_t* exti_init(EXTI_TypeDef* exti, SYSCFG_TypeDef* syscfg);
void exti_external_interrupt(exti_t* exti, uint8_t line, uint8_t gpio);

// Only 21 positions are now supported. This is too hard for other ones.

/**
 * @brief Set the exti line to send an interrupt on rising edge.
 * @details Valid for external EXTI interrupts. The interrupt will be triggered on rising interrupt
 * @param[in,out] exti The exti line descriptor
 */
void exti_rising_interrupt(exti_t* exti, uint8_t line);

/**
 * @brief Set the exti line to send an interrupt on falling edge.
 * @details Valid for external EXTI interrupts. The interrupt will be triggered on falling interrupt
 * @param[in,out] exti The exti line descriptor
 */
void exti_falling_interrupt(exti_t* exti, uint8_t line);

/**
 * @brief Mask the interrupt for given exti line.
 * @details Description
 * @param[in,out] exti The exti line descriptor
 */
void exti_disable_interrupt(exti_t* exti, uint8_t line);

/**
 * @brief Enable the nvic interrupt
 * @param[in,out] exti The exti line descriptor
 */
void exti_nvic_setup(exti_t* exti, uint8_t line);

#endif // EXTI_H