OpenglMan Posted February 23, 2020 Share Posted February 23, 2020 Hi, I have checked that the GPIO Interruptions are very slow. If i receive a wave in a GPIO with IRQ edge enable, for a frequency of 100Hz, all IRQs detected are right (100 interruptions received) However if i increase the frequency of the wave up to 500Hz, i can't detect all the IRQs received, (50 interruptions received more or less) Well, i think maybe, the solution is to change the following kernel parameter: CONFIG_HZ=1000 instead CONFIG_HZ=250 (default) What do you think ?? Is there other solution?? Thanks a lot in advance Link to comment Share on other sites More sharing options...
OpenglMan Posted February 23, 2020 Author Share Posted February 23, 2020 After more checks, the problem is about the pulse width. I mean, i am receiving a pulse wave in GPIO IRQ pin. If the width of the pulse is big, no problem ... all IRQs are right, but if the pulse width is very little, a lot of IRQ are not detected. The pulse with that i need to receive is only 20 useg So it is not a problem of frequency Link to comment Share on other sites More sharing options...
sfx2000 Posted February 29, 2020 Share Posted February 29, 2020 Are you doing a level detect or a trigger detect on the pin? Link to comment Share on other sites More sharing options...
Recommended Posts