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[求救大神]4412开发板设置外部中断为下降沿触发，但是在上升沿的时候也触发中断 设置和问题如下：
1. 中断信号经过硬件消斗处理；
1. 调试迅为4412的外部中断时，设置中断为下降沿触发，但是在上升沿的时候也触发了中断，这里上升沿触发中断时，中断脚的电平读出来为 0；
2. 设置的外部中断脚为EXYNOS4_GPX2(0)，EXYNOS4_GPX2(1)，EXYNOS4_GPX1(2)，EXYNOS4_GPX3(0))，EXYNOS4_GPX3(2)；
3. 其中引脚EXYNOS4_GPX3(0)设置为下降沿中断时，在上升沿不会像其他引脚一样触发中断；
4. 设置为上升沿触发中断时，在上升沿会触发两次中断，在第一次中断时，读取中断脚的电平为 0，在第二次中断时，读取中断脚的电平为 1 ；
5. 调试过程中没有加载下列make menuconfig 路径中提供的的任何驱动：
Device Drivers --->
Input device support --->
· Keyboards --->
6. 中断配置代码如下： - ret = gpio_request(EXYNOS4_GPX3(2), "EINT26");
- if (ret) {
- printk("%s: request GPIO %d for EINT26 failed, ret = %d\n", DRIVER_NAME,
- EXYNOS4_GPX3(2), ret);
- return ret;
- }
- s3c_gpio_cfgpin(EXYNOS4_GPX3(2), S3C_GPIO_SFN(0xF));
- s3c_gpio_setpull(EXYNOS4_GPX3(2), S3C_GPIO_PULL_UP);
- gpio_free(EXYNOS4_GPX3(2));
- ret = gpio_request(EXYNOS4_GPX3(2), "EINT26");
- if (ret) {
- printk("%s: request GPIO %d for EINT26 failed, ret = %d\n", DRIVER_NAME,
- EXYNOS4_GPX3(0), ret);
- return ret;
- }
- s3c_gpio_cfgpin(EXYNOS4_GPX3(0), S3C_GPIO_SFN(0xF));
- s3c_gpio_setpull(EXYNOS4_GPX3(0), S3C_GPIO_PULL_UP);
- gpio_free(EXYNOS4_GPX3(0));
- ret = gpio_request(EXYNOS4_GPX2(1), "EINT17");
- if (ret) {
- printk("%s: request GPIO %d for EINT17 failed, ret = %d\n", DRIVER_NAME,
- EXYNOS4_GPX2(1), ret);
- return ret;
- }
- s3c_gpio_cfgpin(EXYNOS4_GPX2(1), S3C_GPIO_SFN(0xF));
- s3c_gpio_setpull(EXYNOS4_GPX2(1), S3C_GPIO_PULL_UP);
- gpio_free(EXYNOS4_GPX2(1));
- ret = gpio_request(EXYNOS4_GPX1(2), "EINT10");
- if (ret) {
- printk("%s: request GPIO %d for EINT10 failed, ret = %d\n", DRIVER_NAME,
- EXYNOS4_GPX1(2), ret);
- return ret;
- }
- s3c_gpio_cfgpin(EXYNOS4_GPX1(2), S3C_GPIO_SFN(0xF));
- s3c_gpio_setpull(EXYNOS4_GPX1(2), S3C_GPIO_PULL_UP);
- gpio_free(EXYNOS4_GPX1(2));
- ret = request_irq(IRQ_EINT(26), eint26_interrupt,
- IRQ_TYPE_EDGE_FALLING /*IRQF_TRIGGER_FALLING*/, "eint26", pdev);
- if (ret < 0) {
- printk("Request IRQ %d failed, %d\n", IRQ_EINT(26), ret);
- goto exit;
- }
- ret = request_irq(IRQ_EINT(24), eint24_interrupt,
- IRQ_TYPE_EDGE_FALLING /*IRQF_TRIGGER_FALLING*/, "eint24", pdev);
- if (ret < 0) {
- printk("Request IRQ %d failed, %d\n", IRQ_EINT(24), ret);
- goto exit;
- }
- ret = request_irq(IRQ_EINT(17), eint17_interrupt,
- IRQ_TYPE_EDGE_FALLING /*IRQF_TRIGGER_FALLING*/, "eint17", pdev);
- if (ret < 0) {
- printk("Request IRQ %d failed, %d\n", IRQ_EINT(17), ret);
- goto exit;
- }
- ret = request_irq(IRQ_EINT(10), eint10_interrupt,
- IRQ_TYPE_EDGE_FALLING /*IRQF_TRIGGER_FALLING*/, "eint10", pdev);
- if (ret < 0) {
- printk("Request IRQ %d failed, %d\n", IRQ_EINT(10), ret);
- goto exit;
- }
7. 中断信号波形：
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