Changing prescaler and overflow of multiple timers

(3 posts) (2 voices)

pyrohaz
Member

Hey guys,
I want to use the PWM pins 8, 9 and 11, all of which are linked to 3 different timers.

I want the overflow at 255 and the prescaler at 5, quite like in the example on: http://leaflabs.com/docs/lang/api/hardwaretimer.html#lang-hardwaretimer << this page.

When I try to declare 3 different HardwareTimer timer(x)'s, the compiler doesn't allow it due to "redefinition of 'HardwareTimer timer'"

How can I get around this and set all timers to prescale of 5 and overflow of 255?

Also, by changing the timers, does time keeping such as micros() and millis() still work? When you change the timer1 prescaler on arduino, the time keeping functions don't keep time properly.

Thanks, Harris

Posted 2 years ago #
crenn
Moderator

Hi there!

The problem is you're giving the 3 HardwareTimer objects the same name, just give each a different name any it will work fine. Something like this:

HardwareTimer timera(1); HardwareTimer timerb(2); HardwareTimer timerc(3);

Then later you'll need to call the set overflow and pre-scale functions for each HardwareTimer object.

Another timer called systick is used for micros() and millis() and is unaffected by changing the timer pre-scalers and overflows.

Posted 2 years ago #
pyrohaz
Member

Perfect! Thats all I needed.

Thanks a lot! :)

Posted 2 years ago #

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