Just want to clarify. I didn't know about the global <= a word (int) ok on
global IRQ
vars. I had used dint() ... eint() for the calculation of an average updated
by an
IRQ:
// Global declaration
unsigned int avg[32];
unsigned int loopinc = 0;
unsigned int agvnum = 16;
int Myaverage()
{
unsigned int i;
unsigned long int templong = 0;
dint( );
for ( i = 0; i < avgnum; i++ )
templong += avg[i];
eint( );
return ( templong / avgnum );
}
//IRQ
{
avg[loopinc] = newnumber;
loopinc++;
if ( loopinc > avgnum )
loopinc = 0;
}
But found that it worked correctly either way. Since the array "avg[]" is
declared as
unsigned int, I don't have to use dint() eint() correct?
I suppose I should declare avg[] as volitile.
Thoughts?/Thanks.
-Mark
-----Original Message-----
From: Chris Liechti [mailto:[email protected]]
Sent: Monday, June 21, 2004 5:20 PM
To: [email protected]
Subject: Re: [Mspgcc-users] dint()
Robert Seczkowski wrote:
> Does anyone has idea in what cases use dint()....eint().
> If I run the code with one oscilator, Do I need to use
> dint() when I write to common variable.
it has nothing to do with the clock source.
if you modify a global var larger than a word, you have to use
dint();nop() ... eint() because the write operation is not elementary
and a interrupt could occour while accesing the data.
chris
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