#define RT_SERIAL_CONFIG_DEFAULT          
{                                         
    BAUD_RATE_115200, /* 115200 bits/s */ 
    DATA_BITS_9,      /* 8 databits */    
    STOP_BITS_1,      /* 1 stopbit */     
    PARITY_ODD,      /* No parity  */    
    BIT_ORDER_LSB,    /* LSB first sent */
    NRZ_NORMAL,       /* Normal mode */   
    RT_SERIAL_RB_BUFSZ, /* Buffer size */ 
    0                                     
}
若是设置为奇校验，必须把数据长度设置为DATA_BITS_9，否则通讯不正常。