STM32串口1重映射到PB6、PB7

void uart_init(u32 bound) {
    //GPIO端口设置
    GPIO_InitTypeDef GPIO_InitStructure;
    USART_InitTypeDef USART_InitStructure;
    NVIC_InitTypeDef NVIC_InitStructure;

    RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1 | RCC_APB2Periph_GPIOA, ENABLE);	//使能USART1，GPIOA时钟
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE);
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO, ENABLE);
    GPIO_PinRemapConfig(GPIO_Remap_USART1, ENABLE);
//	//USART1_TX   GPIOA.9
//  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9; //PA.9
//  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
//  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;	//复用推挽输出
//  GPIO_Init(GPIOA, &GPIO_InitStructure);//初始化GPIOA.9
//
//  //USART1_RX	  GPIOA.10初始化
//  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;//PA10
//  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;//浮空输入
//  GPIO_Init(GPIOA, &GPIO_InitStructure);//初始化GPIOA.10
    /* TX PB6 */
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_Init(GPIOB, &GPIO_InitStructure);

    /*  RX PB7 */
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_7;
    GPIO_Init(GPIOB, &GPIO_InitStructure);


    //Usart1 NVIC 配置
    NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn;
    NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 3 ; //抢占优先级3
    NVIC_InitStructure.NVIC_IRQChannelSubPriority = 3;		//子优先级3
    NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;			//IRQ通道使能
    NVIC_Init(&NVIC_InitStructure);	//根据指定的参数初始化VIC寄存器

    //USART 初始化设置

    USART_InitStructure.USART_BaudRate = bound;//串口波特率
    USART_InitStructure.USART_WordLength = USART_WordLength_8b;//字长为8位数据格式
    USART_InitStructure.USART_StopBits = USART_StopBits_1;//一个停止位
    USART_InitStructure.USART_Parity = USART_Parity_No;//无奇偶校验位
    USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;//无硬件数据流控制
    USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;	//收发模式

    USART_Init(USART1, &USART_InitStructure); //初始化串口1
    USART_ITConfig(USART1, USART_IT_RXNE, ENABLE);//开启串口接受中断
    USART_Cmd(USART1, ENABLE);                    //使能串口1

}