Timer 0 ,2

nicofer · Joined: 01 May 2013 Posts: 90 Location: GRJ

Hi
I know there are lots of posts and info about timers and interrupts but I have a problem with Timer 0 ,2

I use timer 1 as a pwm timer so that leave me Timer 0 or timer 2 for periodic system interrupt,

I also use Config Clock = Soft to use time functions

The cpu is an at90can32 or 128

My problem is that the timer0 count does not increment , and if I try to use timer2 I get the error : 249 ISR already defined SOFTCLOCK

Here is the timer0 config part :

Config Timer0 = Timer , Prescale = 1024
On Ovf0 Time0e

Enable Timer0

Enable Interrupts

The isr

Time0e:

Toggle Yellowled

Return

In the main loop I have :

Print #2 , Tcnt0

for debugging and the value stay on " 0 " - it does not increment , and also the LED does not toggle .

What am I missing to get this running.

The plan is to get an interrupt each time the timer 0 overflow , with a 16 MHz crystal and 1024 prescale and 8 bit count it should be about 60Hz ?

Cheers
Nico

bgardner · Joined: 09 Apr 2004 Posts: 46 Location: Everett, WA

Hi Nico,

Here's how I configure a Timer to do something like what you're doing.

enniom · Joined: 20 Oct 2009 Posts: 537

Nico,

do not have the chip to test fully ... but as a minimum I suggest including: