LM63_PWM_BASE_SLOW_HZ
LM63_PWM_BASE_SLOW_HZ : LM63_PWM_BASE_FAST_HZ;
pfr_slow = clamp_val(DIV_ROUND_CLOSEST((unsigned long)LM63_PWM_BASE_SLOW_HZ, val),
err_slow = abs_diff(LM63_PWM_BASE_SLOW_HZ / pfr_slow, val);