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Any suggestions for troubleshooting missed interrupts?

Posted by Sterling
3:43 am
21/11/2024

Hey guys, a friend of mine is currently working on AT91SAM9M10-EKES. The Code registers IRQ for 2 GPIO pins (PA20 & PA21) but only receives 22/26 expected interrupts (random). Could there be an issue in this IRQ handling code?

“` static irqreturn_t wiegand_interrupt(int irq, void *dev_id){
atomic_inc(&counter);
printk(KERN_WARNING “IRQ received, counting… %d\n”, atomic_read(&counter));
return 0;
}

irq1 = gpio_to_irq(AT91_PIN_PA21);
if (irq1 < 0) { err = irq1; printk("Unable to get irq number for GPIO %d, error %d\n", AT91_PIN_PA21, err); goto fail; } err = request_irq(irq1, wiegand_interrupt, 0, "wiegand", NULL); irq2 = gpio_to_irq(AT91_PIN_PA20); if (irq2 < 0) { err = irq2; printk("Unable to get irq number for GPIO %d, error %d\n", AT91_PIN_PA21, err); goto fail; } err = request_irq(irq2, wiegand_interrupt, 0, "wiegand", NULL); ``` Any suggestions for troubleshooting missed interrupts? @Middleware & OS