程序中需要使用UART，初始化了UART，使用了UART的FIFO，且FIFO的深度设为1/2，发送和接收都使用中断，可是发送就是死活都不产生，请指点一下！如果不使用FIFO，即FIFO深度为1字节，那么发送、接收中断都正常。
附初始化程序
void UART0_Init(void)
{
UART_InitTypeDef UART_InitStructure;
/* UART0 configuration -------------------------------------------------------*/
/* UART0 configured as follow:
- Word Length = 8 Bits
- One Stop Bit
- No parity
- BaudRate = 9600 baud
- Hardware flow control enabled (RTS and CTS signals)
- Receive and transmit enabled
- Receive and transmit FIFOs are enabled
- Transmit and Receive FIFOs levels have 8 bytes depth
*/
UART_InitStructure.UART_WordLength = UART_WordLength_8D;
UART_InitStructure.UART_StopBits = UART_StopBits_1;
UART_InitStructure.UART_Parity = UART_Parity_No ;
UART_InitStructure.UART_BaudRate = 9600;
UART_InitStructure.UART_HardwareFlowControl = UART_HardwareFlowControl_RTS_CTS;
UART_InitStructure.UART_Mode = UART_Mode_Tx_Rx;
UART_InitStructure.UART_FIFO = UART_FIFO_Enable;
UART_InitStructure.UART_TxFIFOLevel = UART_FIFOLevel_1_8; /* FIFO size 16 bytes, FIFO level 8 bytes */
UART_InitStructure.UART_RxFIFOLevel = UART_FIFOLevel_1_2; /* FIFO size 16 bytes, FIFO level 8 bytes */
UART_DeInit(UART0);
UART_Init(UART0, &UART_InitStructure);
/*------------------------------------------------
Setup UART0 Interrupt, UART0_ITLine = 16
------------------------------------------------*/
VIC1->VAiR[2] = (unsigned int)&UART0_irq;
VIC1->INTSR &= ~(0x01 << (UART0_ITLine - 16));
VIC1->VCiR[2] = 0x20 | (UART0_ITLine - 16);
VIC1->INTER |= (0x01 << (UART0_ITLine - 16));
UART_ITConfig(UART0, UART_IT_Transmit, ENABLE); // 使能发送中断
UART_ITConfig(UART0, UART_IT_Receive | UART_IT_ReceiveTimeOut, ENABLE);
/* Enable the UART0 */
UART_Cmd(UART0, ENABLE);
}
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