为什么串口2与串口1相同的配置，但是串口2每次都发送00？

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void uart_init(u32 bound){  //GPIO¶Ë¿úéèÖà GPIO_InitTypeDef GPIO_InitStructure;USART_InitTypeDef USART_InitStructure;NVIC_InitTypeDef NVIC_InitStructure; RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1|RCC_APB2Periph_GPIOA, ENABLE);//ê1ÄüUSART1￡¬GPIOAê±Öó //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;//¸′óÃíÆíìêä3ö  GPIO_Init(GPIOA, &GPIO_InitStructure);//3õê¼»ˉGPIOA.9     //USART1_RX  GPIOA.103õê¼»ˉ  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;//PA10  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOAtiNG;//¸¡¿Õêäèë  GPIO_Init(GPIOA, &GPIO_InitStructure);//3õê¼»ˉGPIOA.10    //Usart1 NVIC ÅäÖà NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn;NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=3 ;//ÇàÕ¼óÅÏ輶3NVIC_InitStructure.NVIC_IRQChannelSubPriority = 3;//×óóÅÏ輶3NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;//IRQí¨μàê1ÄüNVIC_Init(&NVIC_InitStructure);//¸ù¾YÖ¸¶¨μÄ2Îêy3õê¼»ˉVIC¼Ä′æÆ÷     //USART 3õê¼»ˉéèÖÃUSART_InitStructure.USART_BaudRate = bound;//′®¿ú2¨ìØÂêUSART_InitStructure.USART_WordLength = USART_WordLength_9b;//×Ö3¤Îa8λêy¾Y¸ñê½USART_InitStructure.USART_StopBits = USART_StopBits_1;//ò»¸öí￡Ö1λUSART_InitStructure.USART_Parity = USART_Parity_Even;//ÎTÆæżD￡ÑéλUSART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;//ÎTó2¼têy¾Yá÷¿ØÖÆUSART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;//êÕ·￠Ä￡ê½  USART_Init(USART1, &USART_InitStructure); //3õê¼»ˉ′®¿ú1  USART_ITConfig(USART1, USART_IT_RXNE, ENABLE);//¿aÆô′®¿ú½óêüÖD¶Ï//USART_ITConfig(USART1, USART_IT_IDLE, ENABLE);//¿aÆô′®¿ú½óêüÖD¶Ï  USART_Cmd(USART1, ENABLE);                    //ê1Äü′®¿ú1 }void uart_inita(u32 bound){  GPIO_InitTypeDef GPIO_InitStructure;USART_InitTypeDef USART_InitStructure;NVIC_InitTypeDef NVIC_InitStructure; RCC_APB2PeriphClockCmd(RCC_APB1Periph_USART2|RCC_APB2Periph_GPIOA, ENABLE);//ê1ÄüUSART1￡¬GPIOAê±Öó//USART2TX   GPIOA.2  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2; //PA.9  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;//¸′óÃíÆíìêä3ö  GPIO_Init(GPIOA, &GPIO_InitStructure);//3õê¼»ˉGPIOA.9     //USART2_RX  GPIOA.33õê¼»ˉ  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_3;//PA10  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;//¸¡¿Õêäèë  GPIO_Init(GPIOA, &GPIO_InitStructure);//3õê¼»ˉGPIOA.10    //Usart1 NVIC ÅäÖà NVIC_InitStructure.NVIC_IRQChannel = USART2_IRQn;NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=3 ;//ÇàÕ¼óÅÏ輶3NVIC_InitStructure.NVIC_IRQChannelSubPriority = 3;//×óóÅÏ輶3NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;//IRQí¨μàê1ÄüNVIC_Init(&NVIC_InitStructure);//¸ù¾YÖ¸¶¨μÄ2Îêy3õê¼»ˉVIC¼Ä′æÆ÷     //USART 3õê¼»ˉéèÖÃUSART_InitStructure.USART_BaudRate = bound;//′®¿ú2¨ìØÂêUSART_InitStructure.USART_WordLength = USART_WordLength_9b;//×Ö3¤Îa8λêy¾Y¸ñê½USART_InitStructure.USART_StopBits = USART_StopBits_1;//ò»¸öí￡Ö1λUSART_InitStructure.USART_Parity = USART_Parity_Even;//ÎTÆæżD￡ÑéλUSART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;//ÎTó2¼têy¾Yá÷¿ØÖÆUSART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;//êÕ·￠Ä￡ê½  USART_Init(USART2, &USART_InitStructure); //3õê¼»ˉ′®¿ú1  USART_ITConfig(USART2, USART_IT_RXNE, ENABLE);//¿aÆô′®¿ú½óêüÖD¶Ï//USART_ITConfig(USART1, USART_IT_IDLE, ENABLE);//¿aÆô′®¿ú½óêüÖD¶Ï  USART_Cmd(USART2, ENABLE);                    //ê1Äü′®¿ú1 }