stm_afr_set(&stm_gpioa, 8, STM_AFR_AF0);
stm_moder_set(&stm_gpioa, 8, STM_MODER_ALTERNATE);
stm_ospeedr_set(&stm_gpioa, 8, STM_OSPEEDR_HIGH);
stm_afr_set(&stm_gpioa, 8, STM_AFR_AF0);
stm_moder_set(&stm_gpioa, 8, STM_MODER_ALTERNATE);
stm_ospeedr_set(&stm_gpioa, 8, STM_OSPEEDR_HIGH);