TIM_CCER_CCxP
wfhw->ccer |= TIM_CCER_CCxP(ch + 1);
if (wfhw->ccer & TIM_CCER_CCxP(ch + 1)) {
mask = TIM_CCER_CCxP(ch + 1) | TIM_CCER_CCxNP(ch + 1);
#define TIM_CCER_CC1P TIM_CCER_CCxP(1) /* Capt/Comp 1 Polarity */
#define TIM_CCER_CC2P TIM_CCER_CCxP(2) /* Capt/Comp 2 Polarity */
#define TIM_CCER_CC3P TIM_CCER_CCxP(3) /* Capt/Comp 3 Polarity */
#define TIM_CCER_CC4P TIM_CCER_CCxP(4) /* Capt/Comp 4 Polarity */