#else
#if SERIAL_2_PD5_PD6
stm_rcc.ahbenr |= (1 << STM_RCC_AHBENR_GPIODEN);
stm_afr_set(&stm_gpiod, 5, STM_AFR_AF7);
stm_afr_set(&stm_gpiod, 6, STM_AFR_AF7);
#else
#if SERIAL_2_PD5_PD6
stm_rcc.ahbenr |= (1 << STM_RCC_AHBENR_GPIODEN);
stm_afr_set(&stm_gpiod, 5, STM_AFR_AF7);
stm_afr_set(&stm_gpiod, 6, STM_AFR_AF7);