Editing DCO program to be a slow LFO?

Casty

Heya, I am using the DCO as an LFO but I am trying to make it oscillate even slower. I changed one value in the DCO program that makes the bottom threshold a little slower, but I'm wondering if there are any settings you could recommend for me to tweak it further? Thanks.

jose

Hi! Try this:

lines 148-151, replace with

  //Timer Interrupt Generation -timer 0
  TCCR0A = (1 << WGM01) | (1 << WGM00);  // fast PWM
  TCCR0B = (1 << WGM02) | (2 << CS00);   // 1/8 prescale
  OCR0A = 49;                            // Divide by 400 - 20kHz
  TIMSK = (1 << OCIE0A);                 // Enable interrupt on compare match

line 175, replace with

ISR(TIMER0_COMPA_vect) {

You can try different timer settings, see here.

I have the LFO pending so I'm going to get on with it later this year. My course of action would be to simplify the DCO, and then try a variation of the above, or alternatively construct a higher-resolution timer to get slower but more precise waves. Anyway, see how that goes!

Casty

Perfect! I edited OCR0A to = 130 and got my desired result. Also FYI for anyone else, if you want to start at the lowest octave change around line 162 from getMappedFreq(1) to getMappedFreq(0). Thanks again!

jose

awesome!!

Casty

PS: God damn this LFO opened up a ton of possibilities. Thanks again. I'll have some great demo videos for you in the future.