void init_EXTI()
{
GPIO_InitTypeDef GPIO_InitStructure;
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA , ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2ENR_AFIOEN , ENABLE);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
GPIO_Init(GPIOA, &GPIO_InitStructure);
GPIO_EXTILineConfig(GPIO_PortSourceGPIOA, GPIO_PinSource0);

EXTI_InitTypeDef EXTI_InitStructure;

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

void init_NVIC()
{
NVIC_InitTypeDef NVIC_InitStructure;
NVIC_InitStructure.NVIC_IRQChannel = EXTI0_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0x0F;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0x0F;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
}

int main(void)
{
RCC_Configuration();
init_timer();

init_EXTI();
init_NVIC();

NVIC_EnableIRQ(EXTI0_IRQn);
NVIC_DisableIRQ(TIM6_DAC_IRQn);


while(1);
}

void EXTI0_IRQHandler(void)
{
if (EXTI_GetITStatus(EXTI_Line0) != RESET)
{

EXTI_ClearITPendingBit(EXTI_Line0);
TIM_ClearITPendingBit(TIM6, TIM_IT_Update);
TIM_SetCounter(TIM6, 0);

if (flag)
{
flag = 0;
NVIC_EnableIRQ(TIM6_DAC_IRQn);
}
}
}

RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOC, ENABLE);
GPIO_InitTypeDef GPIO_InitStructure;
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8 | GPIO_Pin_9;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
GPIO_Init(GPIOC, &GPIO_InitStructure);
GPIO_WriteBit(GPIOC, GPIO_Pin_8 | GPIO_Pin_9, Bit_SET);

if (EXTI_GetITStatus(EXTI_Line0) != RESET)

        __DSB();

#include "stm32f10x.h"
#include "stm32f10x_rcc.h"
#include "stm32f10x_gpio.h"
#include "stm32f10x_exti.h"
#include "misc.h"


void EXTI_USER_Button_init()
{
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO, ENABLE);

// Set pin PA0 as input
GPIO_InitTypeDef GPIO_InitStructure;
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_2MHz;
GPIO_Init(GPIOA, &GPIO_InitStructure);

// Tell system that you will use PA0 for EXTI_Line0
GPIO_EXTILineConfig(GPIO_PortSourceGPIOA, GPIO_PinSource0);

EXTI_InitTypeDef EXTI_InitStructure;
// PA0 is connected to EXTI_Line0
EXTI_InitStructure.EXTI_Line = EXTI_Line0;
// Interrupt mode
EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;
// Triggers on rising edge
EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Rising;
// Enable interrupt
EXTI_InitStructure.EXTI_LineCmd = ENABLE;
// Add to EXTI
EXTI_Init(&EXTI_InitStructure);


// Add IRQ vector to NVIC
NVIC_InitTypeDef NVIC_InitStruct;
// PA0 is connected to EXTI_Line1, which has EXTI0_IRQn vector
NVIC_InitStruct.NVIC_IRQChannel = EXTI0_IRQn;
// Set priority
NVIC_InitStruct.NVIC_IRQChannelPreemptionPriority = 0x00;
// Set sub priority
NVIC_InitStruct.NVIC_IRQChannelSubPriority = 0x00;
// Enable interrupt
NVIC_InitStruct.NVIC_IRQChannelCmd = ENABLE;
// Add to NVIC
NVIC_Init(&NVIC_InitStruct);
}

int main(void)
{
// Инициализируем светодиоды LD3 и LD4
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOC, ENABLE);

GPIO_InitTypeDef GPIO_InitStructure;
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8 | GPIO_Pin_9; // PC8 - LD4, PC9 - LD3
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP; // Set pin PC8 and PC9 as output
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_2MHz;
GPIO_Init(GPIOC, &GPIO_InitStructure);

GPIO_SetBits(GPIOC,GPIO_Pin_9);
GPIO_SetBits(GPIOC,GPIO_Pin_8);

EXTI_USER_Button_init();

while(1)
{
//
}
}

void EXTI0_IRQHandler(void)
{
if(EXTI_GetITStatus(EXTI_Line0) != RESET) // Judge whether a line break
{
GPIOC->ODR ^= GPIO_Pin_9;
for(uint32_t i = 0; i < 500000; i++); // Simple delay
}
EXTI_ClearITPendingBit(EXTI_Line0); // Remove LINE interrupt flag bit
}