请教大神们一个STM32串口通信的问题，急！

用的开发板例程将串口1、2定义成了COM2和COM1了………………
int main()
{
// 配置串口参数
/* USARTx configured as follow:
- BaudRate = 9600 baud
- Word Length = 8 Bits
- One Stop Bit
- No parity
- Hardware flow control disabled (RTS and CTS signals)
- Receive and transmit enabled
*/
USART_InitStructure.USART_BaudRate = 9600;
USART_InitStructure.USART_WordLength = USART_WordLength_8b;
USART_InitStructure.USART_StopBits = USART_StopBits_2;
USART_InitStructure.USART_Parity = USART_Parity_No;
USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;
NVIC_InitStructure.NVIC_IRQChannel = USART2_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=1 ;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=1 ;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
/* 完成串口时钟配置、GPIO配置、根据上述参数初始化并使能串口 */
STM_COMInit(COM2, &USART_InitStructure); //初始化USART1，用于发送到电脑
STM_COMInit(COM1, &USART_InitStructure);
USART_ITConfig(USART2, USART_IT_RXNE, ENABLE);//接收短信
USART_ITConfig(USART1, USART_IT_RXNE, ENABLE);
// if(temp_trx[1]==0x2b && temp_trx[1]==0x43 && temp_trx[1]==0x4d && temp_trx[1]==0x54 )
// {
// num=temp_trx[1];
// }
while(1)
{
printf(" welcome! \n\r");
// printf(" temperature: \n\r");
// printf("voltage: \n\r");
// printf("%c",num);
delay(200000);
delay(200000);
delay(200000);
delay(200000);
}
}

串口初始化函数 就用的是开发板例程
void STM_COMInit(COM_TypeDef COM, USART_InitTypeDef* USART_InitStruct)
{
GPIO_InitTypeDef GPIO_InitStructure;
/* Enable GPIO clock */
RCC_APB2PeriphClockCmd(COM_TX_PORT_CLK[COM] | COM_RX_PORT_CLK[COM] | RCC_APB2Periph_AFIO, ENABLE);
if (COM == COM1)
{
/* Enable the USART2 Pins Software Remapping */
GPIO_PinRemapConfig(GPIO_Remap_USART2, ENABLE);
RCC_APB1PeriphClockCmd(COM_USART_CLK[COM], ENABLE);
}
else
{
/* Enable the USART1 Pins */
RCC_APB2PeriphClockCmd(COM_USART_CLK[COM], ENABLE);
}
/* Configure USART Tx as alternate function push-pull */
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_InitStructure.GPIO_Pin = COM_TX_PIN[COM];
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(COM_TX_PORT[COM], &GPIO_InitStructure);
/* Configure USART Rx as input floating */
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
GPIO_InitStructure.GPIO_Pin = COM_RX_PIN[COM];
GPIO_Init(COM_RX_PORT[COM], &GPIO_InitStructure);
/* USART configuration */
USART_Init(COM_USART[COM], USART_InitStruct);
/* Enable USART */
USART_Cmd(COM_USART[COM], ENABLE);
}

现在用串口1来做的接受实验
void USART1_IRQHandler(void)
{
if(USART_GetITStatus(USART2, USART_IT_RXNE) != RESET) //如果是接收中断
{
delay_it(20000);
printf("abc");
}
}