stm32f103c8t6串口3初始化卡住

在进行STM32F103C8T6串口3初始化时，出现卡住的情况可能有以下几种原因：
1. 波特率设置错误：在进行串口3初始化时，需要对波特率进行设置，如果设置错误会导致串口无法正常工作。
2. 时钟配置错误：在进行串口3初始化时，需要先配置相关时钟，如果时钟配置错误也会导致串口无法正常工作。
3. 中断优先级设置错误：如果中断优先级设置错误，也有可能导致串口卡住的情况出现。

以下是一份参考代码，供您参考：

#include "stm32f10x.h"

void USART3_Init(void)
{
    USART_InitTypeDef USART_InitStructure;
    GPIO_InitTypeDef GPIO_InitStructure;
    NVIC_InitTypeDef NVIC_InitStructure;

    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB | RCC_APB2Periph_AFIO, ENABLE);
    RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART3, ENABLE);

    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
    GPIO_Init(GPIOB, &GPIO_InitStructure);

    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_11;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
    GPIO_Init(GPIOB, &GPIO_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(USART3, &USART_InitStructure);

    NVIC_InitStructure.NVIC_IRQChannel = USART3_IRQn;
    NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
    NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;
    NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
    NVIC_Init(&NVIC_InitStructure);

    USART_ITConfig(USART3, USART_IT_RXNE, ENABLE);

    USART_Cmd(USART3, ENABLE);
}

void USART3_IRQHandler(void)
{
    if (USART_GetITStatus(USART3, USART_IT_RXNE) != RESET)
    {
        // 处理接收到的数据
        USART_ClearITPendingBit(USART3, USART_IT_RXNE);
    }
}