TMR0 Confusion

[retepsnikrep]

Thanks it's working on the bench now just need to check my TMR0 calculations.

Using http://eng-serve.com/pic/pic_timer.html I get a prescaler of 1/4 and preload of 6 giving 500us interrupts (2khz) so that gives me 250 ticks per cycle with 8mhz clock.

That works out at 2.5ticks per 1% duty.
So for 10% duty I need to load 25 + 6 into TMR0 for the 90% off part of the cycle? and 225 + 6 for the 10% on part of the cycle?
Does that look sound right?

So my modified code looks like this.

    TMR0_ON_TICKS = DutyCycle           '(DutyCycle must be between 25 - 225 (10-90%)
    TMR0_OFF_TICKS = 250 - TMR0_ON_TICKS
    TMR0_ON_VAL = 250 - TMR0_ON_TICKS + 6
    TMR0_OFF_VAL = 250 - TMR0_OFF_TICKS + 6