GPIO interrupt speed

[Elmoo]

Hi,
how fast GPIO input pins react to interrupts? I have an interrupts coming with interval of ~500 microseconds and it seems that some of the inputs are lost. Is GPIO api capable of processing inputs happening that often?

-Elmo

[jyijyi]

Try to use kernel driver for GPIO interrupt and see if it has improvement.

Error while using Dataclock with GPIOs

[Elmoo]

Thanks! I’m not too familiar with kernel drivers so is there any instructions to use provided gpio_interrupt.rar with leaf environment and wp7607?

[jyijyi]

You need to edit the makefile to use the toolchain in leaf package to compile

You also need to see this:

spiService and gpioService are not starting within an Application

That’s what I did Now it’s working. The problem seems to be in these lines: struct task_struct* t; /* find the task with that pid */ t = pid_task(find_pid_ns(TargetPID, &init_pid_ns), PIDTYPE_PID); send_sig(SIGINT, t, 0); One of these functions crashed the module. Since I don’t need them, I don’t care, but maybe you can fix that before sending it to the next guy that also will waste time on that. Regards, Simon

[Elmoo]

I managed to create and install kernel module. I was trying to use gpios 21 and 22 (60 and 61) when driver failed with error -16, saying gpios were already in use. I checked /proc/interrupts and there was no one using those pins. After I removed gpioService from default.sdef, it started working. Is it not possible to use driver at the same time with gpioService?

Elmo

[jyijyi]

you can check whether the gpio is in /sys/class/gpio/export