2440linux中断编程

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/interrupt.h>
#include <linux/gpio.h>

#define IRQ_NUMBER 17  // 假设使用GPIO 17的中断

static irqreturn_t my_interrupt_handler(int irq, void *dev_id) {
    printk(KERN_INFO "Interrupt occurred!\n");
    // 处理中断事件
    return IRQ_HANDLED;
}

static int __init my_module_init(void) {
    int ret;

    // 请求中断
    ret = request_irq(IRQ_NUMBER, my_interrupt_handler, IRQF_SHARED, "my_interrupt", NULL);
    if (ret) {
        printk(KERN_ERR "Failed to request IRQ %d
", IRQ_NUMBER);
        return ret;
    }

    printk(KERN_INFO "Module loaded, IRQ %d requested
", IRQ_NUMBER);
    return 0;
}

static void __exit my_module_exit(void) {
    // 释放中断
    free_irq(IRQ_NUMBER, NULL);
    printk(KERN_INFO "Module unloaded, IRQ %d freed
", IRQ_NUMBER);
}

module_init(my_module_init);
module_exit(my_module_exit);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Your Name");
MODULE_DESCRIPTION("A simple Linux interrupt handler");