[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: [mw_shl_code=applescript,true] 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;
}[/mw_shl_code] 7. 中断信号波形:
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