oky I want to know which input is pressed so I decide what to do ?
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oky I want to know which input is pressed so I decide what to do ?
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So, you do not need a "change" on the pins.
You have buttons and they can only be pressed, right?
"Change" means =>
If the button is pressed, there is a change. While the button is being pressed, there is no change.
If the button is released, there is also a change.
Are you sure you need interrupt to do this? any particular reason? Many people can solve their issues without using interrupt; simple pin readings can be more then good enough. This may be true in your case, may be.
You may want to check the status of a port for all six pins.
Last edited by sayzer; - 19th February 2008 at 16:52.
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Hi Sayzer,
Looks like he wants an assembly interrupt to jump out of any running process.
looks like a job for instant interrupts."beacuse our system entering in multiple sub routines so using polling way in main code not visible when our programm entering in another subroutine"
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Thanks
I think sayzer understand what I mean, but I think without interrupt we can't know what button is presesd due to busy of my porgramm in other sub routines than main code
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It sounds like you have more inputs than you have PORTB interrupt pins - or maybe your switches aren't connected to PORTB at all.
In that case, you could write an interrupt routine on a timer. The interrupt would read all ports connected to the buttons into variables, then return from the ISR.
Your main program can then (bitwise) AND the variables with a mask to pick out
which button was pushed.
Charles Linquist
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iugmoh, Why not use 1 interrupt pin with a pullup resistor tied to as many diodes as you have switches. Then have 1 port change interrupt read the switch inputs and give the results? Why make it so complicated? Just a thought......
Dave Purola,
N8NTA
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This is where I was going to go.Originally Posted by Dave
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