Variable frequency

[vidor]

Hi,

I have to thank for that great software!
I am developing AVR programs in Assembler and Pascal and a little C.
I've boght the pro version of Flowcode for AVR to develop applications faster and learn C too.
I managed to do some simple programs in no time at all, but I am stuck with a problem:
I want to do a PWM with variable frequency but no success.
I am using ADC0-value to change the Frequency... I've defined the DutyCycle for ~50%.
I can change the frequency, but the DutyCycle is changing too.
How can I achieve to vary the frequeqncy without changing the DutyCycle?

My best regards

Vidor

[Benj]

Hello Vidor

Please could you send me your program and ill try to find out whats going wrong. My email is ben@matrixmultimedia.co.uk

[Sean]

The PWM duty period and cycle period are both controlled seperately and regulated by the selected clock source. If the cycle period is to be changed, but the duty cycle is to be maintained, the duty period must be recalculated (based on the new cycle period).

An alternative method is to select different prescaler settings (5 settings available) or use an external, variable clock source, possibly using Timer2.