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Altera_Forum
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10 years ago

sine wave using Different duty cycles of PWM

Hi i am having problem in generating different duty cycles of PWM. can somebody check my code and tell what is wrong. well code is generating a duty cycle but it does not change it automatically as t...
Altera_Forum's avatar
Altera_Forum
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10 years ago

Your case(counter[15:0]) statement only covers 256 out of 65536 possibilities. I'm sure that's not what you intended.

Have you simulated this? I suspect not. I can see immediately what's wrong having done so and that your 'duty_cycle' value never 'appears' to change. It does change, but it always ends up at the same value for 65280/65536 of the time. (65280 = 65536-256)

Cheers,

Alex