USART 1 配置
如果需要使用奇數(shù)校驗(yàn)或者偶數(shù)校驗(yàn)，需要把數(shù)據(jù)長(zhǎng)度定位9bit
*/
USART_InitStructure.USART_BaudRate = COM1BAUD;
USART_InitStructure.USART_WordLength =USART_WordLength_9b;
USART_InitStructure.USART_StopBits = USART_StopBits_1;
USART_InitStructure.USART_Parity = USART_Parity_Even;
USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;
STM_EVAL_COMInit(COM1, &USART_InitStructure);

/*使能USART1的接收中斷*/
USART_ITConfig(USART1,USART_IT_RXNE,ENABLE);

看了數(shù)據(jù)手冊(cè)，還是不太明白為啥要把數(shù)據(jù)長(zhǎng)度定位9，

難道 奇偶校驗(yàn)位也是數(shù)據(jù)的一部分，無就是 0 +8 = 8，

而有校驗(yàn)就是1+8 = 9

或許只能這樣理解了。