st-ti

#include "stm32f10x.h"
#include "stm32f10x_it.h"

/* led pa8 key--Vcc pa0*/

void NVIC_Configure(void);
void LED_Configure(void);
void KEY_Configure(void);
uint8_t flag=1;

int main(void)
{
 NVIC_Configure( );
 LED_Configure( );
 KEY_Configure( );
	
 while(1)
	{
		if(flag)
		{
		  GPIO_ResetBits(GPIOA,GPIO_Pin_8);
		}
		else
		{
		  GPIO_SetBits(GPIOA,GPIO_Pin_8);
		}	 
	}
}
void NVIC_Configure(void)
{
	NVIC_InitTypeDef NVIC_InitStructure;
	NVIC_PriorityGroupConfig(NVIC_PriorityGroup_1);
	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);
}

void LED_Configure(void)
{
	GPIO_InitTypeDef GPIO_InitStructure;
	RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA,ENABLE);
	GPIO_InitStructure.GPIO_Pin=GPIO_Pin_8;
	GPIO_InitStructure.GPIO_Speed=GPIO_Speed_50MHz;
	GPIO_InitStructure.GPIO_Mode=GPIO_Mode_Out_PP;
	GPIO_Init(GPIOA,&GPIO_InitStructure);
}
void KEY_Configure(void)
{
	GPIO_InitTypeDef GPIO_InitStructure;
	EXTI_InitTypeDef EXTI_InitStructure;
	RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA|RCC_APB2Periph_AFIO,ENABLE);
	GPIO_InitStructure.GPIO_Pin=GPIO_Pin_0;
	GPIO_InitStructure.GPIO_Mode=GPIO_Mode_Out_PP;
	GPIO_Init(GPIOA,&GPIO_InitStructure);
	GPIO_EXTILineConfig(GPIO_PortSourceGPIOA,GPIO_PinSource0);
	
	EXTI_InitStructure.EXTI_Line=EXTI_Line0;
	EXTI_InitStructure.EXTI_Mode=EXTI_Mode_Interrupt;
	EXTI_InitStructure.EXTI_Trigger=EXTI_Trigger_Rising;
	EXTI_InitStructure.EXTI_LineCmd=ENABLE;
	EXTI_Init(&EXTI_InitStructure);
	
}

void EXTI0_IRQHandler(void)
{
	if(EXTI_GetITStatus(EXTI_Line0)!=RESET)
	{
		flag=1-flag;
		EXTI_ClearITPendingBit(EXTI_Line0);
	}
}

2.

#include "stm32f10x.h"
#include "stm32f10x_it.h"

/* led pa8 key  --gnd pa15  */

void NVIC_Configure(void);
void LED_Configure(void);
void KEY_Configure(void);
uint8_t flag=1;

int main(void)
{
 NVIC_Configure( );
 LED_Configure( );
 KEY_Configure( );
	
 while(1)
	{
		if(flag)
		{
		  GPIO_ResetBits(GPIOA,GPIO_Pin_8);
		}
		else
		{
		  GPIO_SetBits(GPIOA,GPIO_Pin_8);
		}	 
	}
}
void NVIC_Configure(void)
{
	NVIC_InitTypeDef NVIC_InitStructure;
	NVIC_PriorityGroupConfig(NVIC_PriorityGroup_1);
	NVIC_InitStructure.NVIC_IRQChannel=EXTI15_10_IRQn;
	NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=0;
	NVIC_InitStructure.NVIC_IRQChannelSubPriority=0;
	NVIC_InitStructure.NVIC_IRQChannelCmd=ENABLE;
	NVIC_Init(&NVIC_InitStructure);
}

void LED_Configure(void)
{
	GPIO_InitTypeDef GPIO_InitStructure;
	RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA,ENABLE);
	GPIO_InitStructure.GPIO_Pin=GPIO_Pin_8;
	GPIO_InitStructure.GPIO_Speed=GPIO_Speed_50MHz;
	GPIO_InitStructure.GPIO_Mode=GPIO_Mode_Out_PP;
	GPIO_Init(GPIOA,&GPIO_InitStructure);
}
void KEY_Configure(void)
{
	GPIO_InitTypeDef GPIO_InitStructure;
	EXTI_InitTypeDef EXTI_InitStructure;
	RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA|RCC_APB2Periph_AFIO,ENABLE);
	GPIO_InitStructure.GPIO_Pin=GPIO_Pin_15;
	GPIO_InitStructure.GPIO_Mode=GPIO_Mode_Out_PP;
	GPIO_Init(GPIOA,&GPIO_InitStructure);
	GPIO_EXTILineConfig(GPIO_PortSourceGPIOA,GPIO_PinSource15);
	
	EXTI_InitStructure.EXTI_Line=EXTI_Line15;
	EXTI_InitStructure.EXTI_Mode=EXTI_Mode_Interrupt;
	EXTI_InitStructure.EXTI_Trigger=EXTI_Trigger_Rising_Falling;
	EXTI_InitStructure.EXTI_LineCmd=ENABLE;
	EXTI_Init(&EXTI_InitStructure);
	
}

void EXTI15_10_IRQHandler(void)
{
	if(EXTI_GetITStatus(EXTI_Line15)!=RESET)
	{
		flag=1-flag;
		EXTI_ClearITPendingBit(EXTI_Line15);
	}
}