topic Re: iMX6SL GPIO Interrupt latency (Yocto Project) in i.MX Processors

iMX6SL GPIO Interrupt latency (Yocto Project)

indukkim — Fri, 26 Sep 2014 06:21:27 GMT

Hi All,

I want to use the GPIO Interrupt, but the interrupt response time is too long (20us more)

How do you feel about the following statements?

iMX6SL, Yocto Project, linux kenel 3.10.17

Please help me......

gpio_request(97,"test1"); //GPIO4 1 Intertup source

gpio_request(26,"test2"); //GPIO0 26 Out Control

gpio_direction_input(97);

gpio_direction_output(26,0);

int irq = gpio_to_irq(97);

int ret = request_irq(irq,test_isr,IRQF_TRIGGER_FALLING|IRQF_TRIGGER_RISING, "gpiodev", NULL);

irqreturn_t test_isr(int irq, void *dev_id)

{

gpio_set_value(26,1);

gpio_set_value(26,0);

gpio_set_value(26,1);

gpio_set_value(26,0);

return IRQ_HANDLED;

}

igorpadykov — Fri, 26 Sep 2014 08:02:45 GMT

Hi Induk

since linux is not real time OS such time is normal,

you can refer to below context latencies (interrupts use

this context switching)

Context switching - times in microseconds

Best regards

igor

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