HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);/* Enable and set PA.12 (Arduino D2) EXTI Interrupt to the lowest priority */NVIC_SetPriority((IRQn_Type)(EXTI4_15_IRQn),0x03);HAL_NVIC_EnableIRQ((IRQn_Type)(EXTI4_15_IRQn));/* Wait for the user to set GPIOA to GND before starting the ...