怎么用stm32f103库函数编写PB7的外部中断程序

以下是用STM32F103库函数编写PB7的外部中断程序的示例代码：

#include "stm32f10x.h"

void EXTI9_5_IRQHandler(void)
{
if (EXTI_GetITStatus(EXTI_Line7) != RESET)
{
// 在这里写处理PB7中断的代码
EXTI_ClearITPendingBit(EXTI_Line7);
}
}

int main(void)
{
// 初始化GPIOB Pin7为输入口，上拉
GPIO_InitTypeDef GPIO_InitStructure;
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_7;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;
GPIO_Init(GPIOB, &GPIO_InitStructure);

// 初始化PB7为外部中断线7
EXTI_InitTypeDef EXTI_InitStructure;
RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO, ENABLE);
GPIO_EXTILineConfig(GPIO_PortSourceGPIOB, GPIO_PinSource7);
EXTI_InitStructure.EXTI_Line = EXTI_Line7;
EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;
EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Falling;
EXTI_InitStructure.EXTI_LineCmd = ENABLE;
EXTI_Init(&EXTI_InitStructure);

// 配置PB7对应的中断
NVIC_InitTypeDef NVIC_InitStructure;
NVIC_InitStructure.NVIC_IRQChannel = EXTI9_5_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);

while (1)
{
// 在这里写主程序的代码
}
}