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I tried looking at the code, could someone point me to where the ARR register is being set for TIM1 (PWM), I want to try reducing the PWM frequency to 12kHZ from 17.5. what else would this break in the code since it appears that all clocks are using TIM1?

Answered my own first question
https://github.com/jsphuebner/stm32-sin ... ration.cpp

/* PWM frequency */
timer_set_period(PWM_TIMER, pwmmax);

any guidance on the 2nd?