Romain Huet

GPIO interrupt delay on LPC 1769

Discussion created by Romain Huet on Jun 16, 2016
Latest reply on Jun 18, 2016 by lpcware

Hello everybody,

I'm new here and I have a small problem with the GPIO interrupt ( LPC 1769). I manage to run the "Pinint.c" program, both with rising or falling edge. But i would like to know if it's normal to have a constant 1.5 micro second delay between the edge of my signal and the start of the handler. I just switch on a led in the interruption program and i can see that the led is on 1.5 microsecond after the edge of my signal.

It seems long and i would like to decrease that but it's like it cannot be shortened. What is the reason of that delay? I read that this GPIO is asynchronous so it should be shorter that a microsecond, isn't it?


Sorry for my english, hoping i'm understandable!