请问down != (key_values[button_irqs->number] & 1)这句代码如何解释
谢谢各位
static irqreturn_t irq_interrupt(int irq, void *dev_id)
{
struct button_irq_desc *button_irqs = (struct button_irq_desc *)dev_id;
int down;
down = !s3c2410_gpio_getpin(button_irqs->pin);
if (down != (key_values[button_irqs->number] & 1))
{
key_values[button_irqs->number] = '0' + down;
ev_press = 1;
wake_up_interruptible(&button_waitq);
}
return IRQ_RETVAL(IRQ_HANDLED);
} |
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