fox_grack wrote: >Hello > >I try to handle an interrupt with the fox board. > >Does anybody can tellme what i have to do? > >I have an I/O Port at the FoxBoard. >If this Port is Low Voltage i whant to run a programm. >First i thought i will write a programm that listen every 10 sec. on >the port. >But is it possible to handle this with an interrupt? >So if the Port is low an programm will start? > >best regards >grack > If you want to use a REAL interrupt you can write a device driver to handle this. Not very simple, writing it, a kernelmodule I must say. If you have it then you read from a device and use 'select()' to block on input until the interrupt arrives, then you fork or exec the process you want. Very difficult. What I would do is write a script that loops, checks the input pin you need, starts the program if needed and sleeps a second. You will not be loading the cpu for more then about 0.1 % using this approach. This is the way I would do it if I was focussed on the result not on the technical fun of writing a device driver. check out the command setbits and readbits! also read http://www.acmesystems.it/?id=17 If your input pulses are very short you can use a JK-FlipFlop circuit to clock your pulse in and use another pin to reset your flipflop after you have read the input pin. (I did it and it worked for me)
Best regards, Edwin van den Oetelaar
