So basically, instead of having the analog data read in the actual
interrupt routine, the interrupt routine is
only setting a flag.  In the main program when the flag is set, the main
program itself will start reading in
data?

I guess you could increment a register as well so you can INTERLEAVE the
gathering of analog data.  So each
interrupt gets the next analog sample.  This way, the main program loop
could run more smoothly then having
to interrupt and gather all 8 analog samples in one chunk.

Dan



The way I do things that need to happen at specific intervals is to have
a timer interrupt set a flag. The main program runs in a loop checking
the flag, then does the conversion and resets the flag. As long as the
time taken to go through the loop is less than the interval, all is
well.


At 07:48 AM 3/2/2004 -0500, you wrote:
>I wanted to ask your advice regarding the use of a MAX127 IC in my
>program. I'm currently using a PIC16C76 and a MAX127 using I2C
>interface.
>
>All i'm really doing with this program is reading in 8 pieces of analog

>data, comparing it with threshold information, and then displaying the
>data on an LCD and sending control bits based on the data.
>
>I'm using a 4x20 LCD and have about five screens which display the
>information differently.  The user cycles through screens using a
>pushbutton.
>
>My question is, what is the best way to add a MAX127 read into my
>program.
>
>I was thinking maybe have the whole routine triggered of an internal
>timer interrupt.  So every X seconds, the program would be interrupted
>and gather all 8 samples of analog data.
>
>Is this what is typically done?
>
>Any help appreciated.
>Thanks
>
>Dan
>
>
>
>--
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Larry Bradley
Orleans (Ottawa), Ontario, CANADA

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