请教一个简单的串口FIFO问题

只看该作者 · 2008-3-5 10:49

    Uart_Printf("[Uart channel 0 tx FIFO Interrupt Test] ");
    Uart_TxEmpty(0);    //wait until tx shifter is empty.

    uart0TxStr="123456789abcdef";//UART0 Tx FIFO interrupt test is good!!!! ";
    rUFCON0=(2<<6)|(1<<4)|(6)|1;
    //FIFO trigger:tx/rx:8byte,tx/rx_fifo reset(will be cleared),FIFO enable.
    rUCON0 = 0x244;    //tx:levl,rx:edge,error int,normal*2,interrupt(Start)
    rINTMSK=~(BIT_GLOBAL|BIT_UTXD0);

    Delay(500);

请问这段fifo中断测试程序在 rINTMSK=~(BIT_GLOBAL|BIT_UTXD0);语句后市因为什么中断的阿？是发送超时么？