//库函数配置

    UART1_DeInit();

    UART1_Init((u32)1000000, UART1_WORDLENGTH_8D, UART1_STOPBITS_1, \

    UART1_PARITY_NO , UART1_SYNCMODE_CLOCK_DISABLE , UART1_MODE_TXRX_ENABLE);

    UART1_ITConfig(UART1_IT_RXNE_OR,ENABLE  );

    UART1_Cmd(ENABLE );

    //寄存器配置

    //UART1->CR1 |= 0X00;

    //UART1->CR3 |= 0X00;

    UART1->CR2 = 0X2C;

    UART1->BRR2 = 0x00;

    UART1->BRR1 = 0x01;  //1Mbps

    UART1->CR1 &= (uint8_t)(~0X20);//enable uart1