LM63_PWM_BASE_FAST_HZ
LM63_PWM_BASE_SLOW_HZ : LM63_PWM_BASE_FAST_HZ;
pfr_fast = clamp_val(DIV_ROUND_CLOSEST((unsigned long)LM63_PWM_BASE_FAST_HZ, val),
err_fast = abs_diff(LM63_PWM_BASE_FAST_HZ / pfr_fast, val);