Stm32f407 key interrupt

Configure the register through the figure above , Yes 23 External interrupts are shown below

According to external interrupt ,9 System configuration controller (SYSCFG) Chapter of ,SYSCFG external interrupt configuration register 1(SYSCFG_EXTICR1~4) Configure interrupt source and pin ,

See the reference manual for relevant interruptions SYSCFG And interruptions and events 、Core_m4 NVIC Chapter of
1、 Steps to configure key interrupts

（1） To configure PA0 and PC13 Of GPIO Pin type mode
（2） Configure in SYSCFg Interrupt source and pin
（3） Enable the associated clock ,（GPIO and SYSCFG）
（4）/* choice EXTI Interrupt source */
（5） Configure nested vector interrupt controller NVIC
The programming is as follows 、
#include “ygcKeyItr.h”

void ygcNVIC_Configuration()
{
NVIC_InitTypeDef NVIC_InitStruct;
NVIC_PriorityGroupConfig(NVIC_PriorityGroup_1);
NVIC_InitStruct.NVIC_IRQChannel=EXTI0_IRQn;
NVIC_InitStruct.NVIC_IRQChannelPreemptionPriority=0;
NVIC_InitStruct.NVIC_IRQChannelSubPriority=1;
NVIC_InitStruct.NVIC_IRQChannelCmd=ENABLE;
NVIC_Init(&NVIC_InitStruct);
NVIC_InitStruct.NVIC_IRQChannel=EXTI15_10_IRQn;
NVIC_Init(&NVIC_InitStruct);
}

void ygcEXTI_Key_Config(void)
{
/ Define a GPIO_InitTypeDef Type of structure /
GPIO_InitTypeDef GPIO_InitStructure;
// Can make GPIO The clock
RCC_AHB1PeriphClockCmd( RCC_AHB1Periph_GPIOA|RCC_AHB1Periph_GPIOC,ENABLE);
// To configure PA0 and PC13 Input mode pin
GPIO_InitStructure.GPIO_Pin=GPIO_Pin_0;
GPIO_InitStructure.GPIO_Mode=GPIO_Mode_IN;
GPIO_InitStructure.GPIO_PuPd=GPIO_PuPd_NOPULL;
GPIO_Init(GPIOA, &GPIO_InitStructure);
// timing PC13 Pin
GPIO_InitStructure.GPIO_Pin=GPIO_Pin_13;
GPIO_Init(GPIOC, &GPIO_InitStructure);
// Can make SYSCFG The clock
RCC_APB2PeriphClockCmd(RCC_APB2Periph_SYSCFG, ENABLE);
/* Connect EXTI Interrupt source To key1 Pin /
SYSCFG_EXTILineConfig( EXTI_PortSourceGPIOA, EXTI_PinSource0);
/ Connect EXTI Interrupt source To key2 Pin */
SYSCFG_EXTILineConfig( EXTI_PortSourceGPIOC, EXTI_PinSource13);

/* Initialize interrupt source */
EXTI_InitTypeDef  EXTI_InitStruct;
EXTI_InitStruct.EXTI_Line=EXTI_Line0;// External interrupt channel PA0
EXTI_InitStruct.EXTI_Mode=EXTI_Mode_Interrupt;
EXTI_InitStruct.EXTI_Trigger=EXTI_Trigger_Rising;
EXTI_InitStruct.EXTI_LineCmd=ENABLE;
EXTI_Init(&EXTI_InitStruct);
EXTI_InitStruct.EXTI_Line=EXTI_Line13; External interrupt channel PC13
EXTI_Init(&EXTI_InitStruct);

/*  The third step ： To configure NVIC */
  ygcNVIC_Configuration();
/*  Configure interrupt function */

}
void EXTI0_IRQHandler(void)//PA0 Interrupt function
{
// Make sure that... Is generated EXTI Line interrupt
if(EXTI_GetITStatus(KEY1_INT_EXTI_LINE) != RESET)
{
// LED1 Take the opposite
LED1_TOGGLE;
// Clears the interrupt flag bit
EXTI_ClearITPendingBit(KEY1_INT_EXTI_LINE);
}
}

void EXTI15_10_IRQHandler(void)//PC13 Interrupt function
{
// Make sure that... Is generated EXTI Line interrupt
if(EXTI_GetITStatus(KEY2_INT_EXTI_LINE) != RESET)
{
// LED2 Take the opposite
LED2_TOGGLE;
// Clears the interrupt flag bit
EXTI_ClearITPendingBit(KEY2_INT_EXTI_LINE);
}
}