44b0串口的自动流控与FIFO

sunxq

44b0的串口, AFC和FIFO功能如何使用呀?为什么我启用了这两个功能后串口就无法正常工作了呢?我的代码如下:
void init_uart()
{
    /* Bit6    : infra-Red mode or not, 1 for infra-Red mode.
     * bit5..3 : parity mode, 0xx for no parity.
     * Bit2    : number of stop bit, 0 one stop bit, 1 two stop bit per frame.
     * Bit1..0 : data bits per frame, 11 for 8 bits.
     */
    rULCON0 = 0x3;     /*No parity, 1 stop bit, 8 data bits*/
    rULCON1 = 0x3;
    /* Bit7..6 : Tx FIFO Trigger Level
     * Bit5..4 : Rx FIFO Trigger Level
     * Bit3    : Reserved and not used.
     * Bit2    : Tx FIFO Reset
     * Bit1    : Rx FIFO Reset
     * Bit0    : FIFO enable or not, 0 for disable, 1 for enable.
     */
    rUFCON0 = 0x1;     /* FIFO enabled. */
    rUFCON1 = 0x1;
    /* Bit4    : Auto Flow Control(AFC) enable or not, 1 for enable, 0 for disable.
     * Bit3..1 : Reserved and must be 0.
     * Bit0    : nRTS, only used when AFC is disabled.
     */
    rUMCON0 = 0x10;     /* AFC disabled. */
    rUMCON1 = 0x10;
    /* Bit9    : Tx interrupt type, 0 for pulse, 1 for level
     * Bit8    : Rx interrupt type, 0 for pulse, 1 for level
     * Bit7    : Rx timeout enable, 0 for disable, 1 for enable
     * Bit6    : Rx error status interrupt enable, 0 for disable, 1 for enable
     * Bit5    : Loop-back mode, 0 for normal option, 1 for Loop-back mode
     * Bit4    : Send Break Signal, 0 for normal transmit, 1 for send break signal
     * Bit3..2 : Transmit Mode, 00 for disable, 01 for interrupt request or polling mode
     * Bit1..0 : Receive Mode, 00 for disable, 01 for interrupt request or polling mode
     */
    rUCON0 = 0x45;     /* Tx is using polling mode.
                        * Rx is using pulse interrupt type.
                        * Rx timeout is disabled.
                        * Don't send break signal.
                        */
    rUCON1 = 0x45;
    /* default baud rate is 57600bps. */
    rUBRDIV0 = (MCLK + 8 * BAUD_DEFAULT)/(16 * BAUD_DEFAULT) - 1;
    rUBRDIV1 = (MCLK + 8 * BAUD_DEFAULT)/(16 * BAUD_DEFAULT) - 1;
}
在把rUFCON和rUMCON都设为0x0时, 串口可以正常工作, 但在传输数据量大时会出现Overun Error.
[em04]