exti.c File Reference

External Interrupt (EXTI) configuration for vehicle detection inputs. More...

#include "exti.h"
#include "stm32f446xx.h"

Macros
#define	GPIOCEN   (1U<<2)
#define	SYSCFGEN   (1U<<14)

Functions
void	exti_init (void)
	Initializes external interrupt inputs for vehicle detection buttons.

Detailed Description

External Interrupt (EXTI) configuration for vehicle detection inputs.

This file configures GPIO input pins and EXTI lines used for detecting button press events representing vehicle arrivals at traffic lights.

Macro Definition Documentation

GPIOCEN

#define GPIOCEN   (1U<<2)

SYSCFGEN

#define SYSCFGEN   (1U<<14)

Function Documentation

exti_init()

void exti_init

(

void

)

Initializes external interrupt inputs for vehicle detection buttons.

This function configures GPIOC pins PC10–PC13 as input signals with internal pull-up resistors and maps them to EXTI lines 10–13. Falling edge triggers are enabled to detect button press events.

The EXTI lines are unmasked and routed through the NVIC using the EXTI15_10 interrupt channel.

Note

Global interrupts are temporarily disabled during configuration to prevent spurious interrupt execution.