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Changing PWM duty cycle with value from variable

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Hello, so I have a problem like this. I have a variable which goes from 128-255 and a CCR1 register that goes from 0-255. The question is, How do I change value in CCR1 by two steps for every step in my variable. So 128 is 0 in CCR1, 129 is 2, 130 is 4 etc.


I suck at programming so I hope some of you guys can help me out. Thanks

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