STM32串口使用偶校驗時(shí)初始化

USART 1 配置
如果需要使用奇數校驗或者偶數校驗，需要把數據長(cháng)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);

看了數據手冊，還是不太明白為啥要把數據長(cháng)度定位9，

難道 奇偶校驗位也是數據的一部分，無(wú)就是 0 +8 = 8，

而有校驗就是1+8 = 9

或許只能這樣理解了。