On Fri, 2005-10-07 at 17:52 +1000, Timothy Smith wrote:
ok i understand about interupts. you register an interupt() for the
specific event and when it happens it interupts the ic and runs it.
the timer stuff is still a little confusing, all the abreviations are
unintuitive. is there a
On Fri, 2005-10-07 at 17:52 +1000, Timothy Smith wrote:
the timer stuff is still a little confusing, all the abreviations
are unintuitive.
You mean the bit names?
They come straight from Atmel's datasheet. Usually, with a bit of
phantasy, you could guess what they mean.
/* tmr1 is
#include avr/io.h
int
main(void){
DDRA |= 1PA0;
while (1) {
PORTA = !(1PA0);
};
}
i want the following code to light the led connected to porta pin0, it
should work?
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Timothy Smith wrote:
i want the following code to light the led connected to porta pin0, it
should work?
I don't think so. Try:
main()
{
DDRA|= 1PA0;
PORTA|=1PA0;
}
Bernard
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Joerg Wunsch wrote:
Timothy Smith [EMAIL PROTECTED] wrote:
while (1) {
PORTA = !(1PA0);
! is the Boolean negation. You want bitwise negation, operator ~.
ok i made it turn on. now i've attempted to make it blink,
unsuccessfully. the light just stays off now.
also, is
ok i made it turn on. now i've attempted to make it blink,
unsuccessfully. the light just stays off now.
unsigned char i;
DDRA |= 1PA0;
while (1) {
for (i=0; i2; i++) wait();
PORTA |= 1PA0;
That's normal I think. You turn the LED on when i reaches 20,000,
Timothy Smith [EMAIL PROTECTED] wrote:
also, is there a more elegant way of doing time delays?
Yes, use a hardware timer. ;-) That's what they are made for.
Otherwise, have a look at the functions in avr/delay.h.
--
Jorg Wunsch Unix support engineer
A hardware clock is different than a hardware timer.
Look at the datasheet for the AVR you are using. The hardware timer is
built into the AVR, and if all you want to do is flash an LED, like the
previous poster wrote, you would find that it's really easy to place
such a routine in a timer
Daniel Mayo wrote:
A hardware clock is different than a hardware timer.
Look at the datasheet for the AVR you are using. The hardware timer
is built into the AVR, and if all you want to do is flash an LED, like
the previous poster wrote, you would find that it's really easy to
place such a
On Thu, 2005-10-06 at 21:59 +0200, Joerg Wunsch wrote:
Patrick Blanchard [EMAIL PROTECTED] wrote:
Yes, use a hardware timer. ;-) ...
Otherwise, have a look at the functions in avr/delay.h.
FWIW using the delay.h made more sense for me; easier code to
follow.
It eats up your CPU.
Patrick Blanchard wrote:
On Thu, 2005-10-06 at 21:59 +0200, Joerg Wunsch wrote:
Patrick Blanchard [EMAIL PROTECTED] wrote:
Yes, use a hardware timer. ;-) ...
Otherwise, have a look at the functions in avr/delay.h.
FWIW using the delay.h made more sense for me;
On Fri, 2005-10-07 at 09:54 +1000, Timothy Smith wrote:
so if i was to use the PWM in an avr i could time events without holding
up the rest of the program? this is a little important for my
appliaction because i need to run multiple outputs at once, each being
timed individually
You
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