Using HPWM to blink an LED?

[Christopher4187]

Is there a way to use the HPWM to blink an LED? When I read the manual, it seems like you can only use high frequencies and the LED only appears to be bright or dim. I know you can connect external hardware, I guess like a shift register to do it but I'd rather just use the output of the PIC if possible.

Thanks,

Chris

[Dave]

Christopher4187, There is no way to change the hardware divide string to make it any longer. You can only set the prescaler to it's maximum value of 16X and set the PR2 register for a maximum of 255. This will give you a minimum frequency of about 1.22 khz. at a 20 Mhz clock.

Dave Purola,
N8NTA

[Acetronics2]

Christopher,

IF you'd wanted to use HPWM ... there's a Timer1 unused aboard your chip ... YESS !

So, running TMR1 as a free timer and toggling the led at each TMR1 overflow interrupt ... will do the job. A basic interrupt should be enough ...

Without any "external" counter, you should get a ~ 1 sec maximum period @ 4 Mhz clock ...

Alain

PS: It's a bit like giving marmelade to a pig ... but, if unused ...

[mister_e]

Yup TIMER interrupt is the way to go.

[Christopher4187]

I'm a bit confused about using the timer1. I have read Darrel's posts on his timers and trying to follow the code myself is very confusing. Is there a step by step explanation on how to do it. I didn't see anything in the manual and if there was I didn't see it.

Thanks,

Chris

[Darrel Taylor]

Chris,

You've read this post?
http://www.picbasic.co.uk/forum/showthread.php?p=23259

What part don't you understand?

How the Timer works?
How the Interrupts work?
How the program works?
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