Hello
I have wrote a GPIO-driver, that toggle the value of a GPIO when a
interrupt is comming from an another GPIO.
When I measure the latency between the interrupt and the toggled Pin
it's about ten times higher than without the rt-patch.
(without Patch = 8-11 us
with Patch = 30-110 us)
Can anybody help me please?
I have a Beagleboard with an Omap-Arm running.
Here are the changes in gpio_keys.c:
static irqreturn_t gpio_keys_isr(int irq, void *dev_id)
{
struct gpio_button_data *bdata = dev_id;
struct gpio_keys_button *button = bdata->button;
BUG_ON(irq != gpio_to_irq(button->gpio));
if (button->debounce_interval)
{
mod_timer(&bdata->timer,
jiffies + msecs_to_jiffies(button->debounce_interval));
}
else
{
// schedule_work(&bdata->work);
if(gpio_get_value(158)==0)
{
gpio_set_value(158, 1);
}
else
{
gpio_set_value(158, 0);
}
}
return IRQ_HANDLED;
}
Thx Christian
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