STM32F103中断出现错误了

#include "stm32f10x.h"  



void USART1_Init()  

{  

    NVIC_InitTypeDef NVIC_InitStructure;  

    GPIO_InitTypeDef GPIO_InitStructure;  

    USART_InitTypeDef USART_InitStructure;  

        

    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);  

        RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1, ENABLE);

      

    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;  

    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;  

    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;  

    GPIO_Init(GPIOA, &GPIO_InitStructure);  

      

    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;  

    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;  

    GPIO_Init(GPIOA, &GPIO_InitStructure);  

        

        NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);

    NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn;  

    NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;  

    NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;

    NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;          

    NVIC_Init(&NVIC_InitStructure);

  

    USART_InitStructure.USART_BaudRate = 9600;

    USART_InitStructure.USART_WordLength = USART_WordLength_8b;

    USART_InitStructure.USART_StopBits = USART_StopBits_1;

    USART_InitStructure.USART_Parity = USART_Parity_No;

    USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;

    USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;

    USART_Init(USART1, &USART_InitStructure);

  

    USART_Cmd(USART1, ENABLE);

    USART_ITConfig(USART1, USART_IT_TC, ENABLE);

    USART_ITConfig(USART1, USART_IT_RXNE, DISABLE);

}    

  

int global = 50;



int main(void)  

{  

    USART1_Init();  

        

        while (1)

        {

            USART_SendData(USART1, global);

    }

        

        return 0;

}  



void USART1_IRQHandler(void)

{

    if(USART_GetITStatus(USART1, USART_IT_TC) == SET)

    {

        USART_ClearFlag(USART1, USART_FLAG_TC);

    }

    global++;

}

USART_ITConfig(USART1, USART_IT_TC, ENABLE);