TIM_BDTR_BK2P 496 drivers/pwm/pwm-stm32.c : TIM_BDTR_BK2E | TIM_BDTR_BK2P | TIM_BDTR_BK2F; TIM_BDTR_BK2P 504 drivers/pwm/pwm-stm32.c bdtr |= TIM_BDTR_BKP | TIM_BDTR_BK2P;