`gpio-irq-interrupt-10.ino`

Efinix Sapphire RV64 : Configurable 64-bit RISC-V SoC for FPGAs · File : gpio-irq-interrupt-10.ino · Language : C · Use case : Gérer un bouton poussoir via une interruption matérielle pour éviter le polling.

Configures a GPIO interrupt to detect button press, freeing the processor from constant polling.

Connect a button between the GPIO pin and ground (with internal or external pull-up). Interrupt configuration often requires specific mapping in the Efinity constraint file to link the GPIO to the IRQ line. The interrupt handler must be short and fast.

gpio-irq-interrupt-10.ino

#include <stdio.h>
#include "xhal_gpio.h"
#include "xhal_irq.h"

#define BTN_PIN GPIO_PIN_2
#define IRQ_LINE GPIO_IRQ_LINE_2 // À mapper dans Efinity

volatile int button_pressed = 0;

void gpio_irq_handler(void) {
    // Effacer l'interruption
    xhal_gpio_clear_irq_status(BTN_PIN);
    button_pressed = 1;
}

int main(void) {
    xhal_gpio_init();
    xhal_gpio_config(BTN_PIN, GPIO_INPUT);
    
    // Configurer l'interruption sur front descendant
    xhal_gpio_configure_irq(BTN_PIN, GPIO_IRQ_FALLING);
    
    // Enregistrer le handler
    xhal_irq_register(IRQ_LINE, gpio_irq_handler);
    xhal_irq_enable(IRQ_LINE);
    
    printf("Waiting for button press...\n");
    
    while(1) {
        if (button_pressed) {
            printf("Button Pressed!\n");
            button_pressed = 0;
        }
        // WFI pour économie d'énergie (si supporté)
        // asm volatile("wfi");
    }
}

← Back to the board