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Altera_Forum's avatar
Altera_Forum
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15 years ago

HOW TO DETECT A RISING EDGE(OF A PULSE) ON NIOS 2 (ucLINUX) AS AN INTERRUPT

hi every one, i am using a nios 2(on cyclone 2) on uclinux os..can anybody suggest me ,how can i detect a rising or falling edge of a pulse(hardware signal) as an interrupt to the processor..??
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
15 years ago

in the code there r instructions like

main()

{

signal(SIGPIPE,SIG_IGN);

int fp,oflags;

signal(SIGIO, interrupt_handler);

fp = open("/dev/interrupt1", O_NOCTTY);

if(fp < 0)

{

printf("Error opening device node !\n");

}

else

{

fcntl(fp, F_SETOWN, getpid());

oflags = fcntl(fp, F_GETFL);

fcntl(fp, F_SETFL, oflags | FASYNC);

}

}///end of main function

interrupt_handler()

{

\\control should come here when edge is detected

}