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PWM-QG8-Sinewave Lookup Table

Question asked by Abhijit Jagtap on Aug 11, 2013
Latest reply on Aug 12, 2013 by iansmusical



I am trying to generate a variable frequency (few Hz to 100 Hz) PWM waveform to drive an H-Bridge.

A Potentiometer varies a voltage which in turn varies the Frequency.


How should i proceed with this?


1)I have used native PWM CH0 pin as Edge-aligned PWM.

2)I use a 256 byte LUT(Look up table)

3)PWM frequency 15.625 Khz

4)Used Timer overflow interrupt to update Duty cycle from LUT value.

5)Haven't yet implemented ADC-->PWM updates.


What I need is a guideline, as to, what should be the best method and limitations etc with QG8.

Also am not sure how i will change the frequency (up to 100 Hz) with this.


Please someone throw some light....

Best Rgds