中断
INTERRUPT_HANDLER(USART1_RX_TIM5_CC_IRQHandler,28)
{
/* In order to detect unexpected events during development,
it is recommended to set a breakpoint on the following instruction.
*/
USART1_SendByte(0x88);
bTemp=USART_ReceiveData8(USART1);//USART1->DR
USART_ClearITPendingBit(USART1,USART_IT_RXNE);
USART1_SendByte(bTemp);
}