// NVIC configuration

NVIC_InitTypeDef NVIC_InitStructure;

// Set the Vector Table base location at 0x08000000 !!!!!!
NVIC_SetVectorTable(NVIC_VectTab_FLASH, 0x0);

// Configure one bit for preemption priority
NVIC_PriorityGroupConfig(NVIC_PriorityGroup_1);
// Enable the EXTI0 Interrupt

//NVIC_InitStructure.NVIC_IRQChannel = EXTI9_5_IRQChannel; // !!!

NVIC_InitStructure.NVIC_IRQChannel = EXTI0_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);


// GPIO configuration
GPIO_InitTypeDef GPIO_InitStructure;
// Configure PA0 as input floating (EXTI Line0)
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_AFIO, ENABLE); // можно ли последовательно?
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0;
GPIO_Init(GPIOA, &GPIO_InitStructure);


// Configure EXTI Line0 to generate an interrupt on rising or falling edge
GPIO_EXTILineConfig(GPIOA,GPIO_PinSource0);

EXTI_InitStructure.EXTI_Line = EXTI_Line0;
EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;
EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Rising_Falling;
EXTI_InitStructure.EXTI_LineCmd = ENABLE;
EXTI_Init(&EXTI_InitStructure);


NVIC_EnableIRQ(EXTI0_IRQn);