Interrupts and delay()

hi, started to program attiny85 using following core hlt:
http://highlowtech.org/?p=1695

as far know not support tone() function so, in attempt make own created following sketch:

code: [select]

void setup()
{
  pinmode(0, output);
}

void loop()
{
  mytone(500);
  delay(1000);
  mynotone();
  delay(1000);
}

isr(timer1_compa_vect)
{
   portb ^= (1 << portb0);
}


void mytone(int freq)
{
  float period = 1.00/(float)freq;
  float ticks = (125000.00*(float)period)/2.00;
  int on = ticks/255;
  tccr1 = (1 << ctc1) | (1 << cs12); // divide 8 prescaler
 
 
  ocr1a = ticks; //
  ocr1c = ticks; //
  timsk = (1 << ocie1a) | (1<<toie1);
 
  sei();
}

void mynotone()
{
tccr1 = 0;
tcnt1 = 0;
}

everything works fine, however, when running sketch delays between tones aren,t 1000ms
if knows why happens, please let me know. thanks.

quote from: peppel on aug 04, 2014, 07:00 am

everything works fine, however, when running sketch delays between tones aren,t 1000ms
if knows why happens, please let me know. thanks.

so how long delay instead of expected 1000ms?

and same length?

...r

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