On Sat, 22 Apr 2006 08:30:33 +0200
Lars Noschinski [EMAIL PROTECTED] wrote:
* [EMAIL PROTECTED] [EMAIL PROTECTED] [2006-04-22 08:09]:
How can I use the PORTB constant with variables? eg:
while (1) {
var = 1;
PORTB = var
}
This will work. But after seven iterations (if var is (u)int8_t), var
will be 0.
That is what I'm trying to acheive. I'd like to be able to do it with
variables
like I do above, but it doesn't seem to work. Once I replace var with an
actual number, it works as expected.
The problem lies probably elsewhere.
OK. This is some brief code... This works as expected.
int main() {
DDRB = 255;
while (1) {
int var=1;
while (var != 0) {
PORTB = var;
var = 1;
}
}
return 0;
}
This example doesn't, and I don't know why... I know it's specific to C, so
that's why I'm asking here...
int var 1;
void blink()
{
PORTB ^= var; // LED on
sleep(50);
PORTB = 255; // LEDs off
sleep(50);
}
void change() {
var = 1;
}
int main() {
DDRB = 255;
PORTB=255;
while (1) {
blink();
change();
}
return 0;
}
This doesn't work as expected... not sure why. I would like to keep the
functions if possible, I'm thinking it has something to do with scope perhaps?
I am new to C by the way, if it isn't evident already (:
Thanks,
Chris-
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