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没人给个意见吗？

如何验证状态字？我的程序如下：

LOCAL int uartTxStartup
(
SIO_CHAN * pSioChan /* channel to start */
)
{
UINT8 lsrValue;
UINT8 outChar;

UART_CHAN * pUartChan = (UART_CHAN *)pSioChan;

UART_LOGMSG(("uartTxStartup: startup tx a char\n"));

/* This routine should only be called while in interrupt mode */
if (pUartChan->mode == SIO_MODE_POLL)
return ENOSYS; /* Not valid for polled mode operation */

/* Disable all the interrupts */
pUartPtr->ier &= ~(UART_IER_ERBI | UART_IER_ELSI |
UART_IER_EDSSI |UART_IER_ETBEI);

/* SIU interrupt mask */
*SIMASK(pUartChan->ioBase) &= ~(SIMASK_IRM0 >> pUartChan->intVec);

lsrValue = pUartPtr->lsr;

while(((lsrValue & UART_LSR_THRE)!=0)&&
((*pUartChan->getTxChar) (pUartChan->getTxArg, &outChar) == OK));
{
pUartPtr->rbthr = outChar;
UART_LOGMSG(("uartTxStartup:pUartPtr->rbthr = 0x%x\n",outChar));

/* Get the new status of line status register */
lsrValue = pUartPtr->lsr;
}

/* SIU interrupt unmask */
*SIMASK(pUartChan->ioBase) |= SIMASK_IRM0 >> pUartChan->intVec;

/* Enable all the interrupts*/
pUartPtr->ier |= UART_IER_ERBI | UART_IER_EDSSI |UART_IER_ELSI;;

return (OK);
}

每次使用write函数的时候startup调用了一次，并且while循环中的logMsg只打印了一次，且取得字符串最后一个字符。
比如write(fd,"123",3),shell里输出：

uartTxStartup: startup tx a char
uartTxStartup: pUartPtr->rbthr = 0x33

起初我还怀疑(lsrValue & UART_LSR_THRE)!=0这个条件错误，去掉这句还是一样。

我该如何处理呢？

老大，你在while(((lsrValue & UART_LSR_THRE)!=0)&&
((*pUartChan->getTxChar) (pUartChan->getTxArg, &outChar) == OK));
后面加分号干吗？？？

不加分号应该就好了。

哈，我晕死！什么时候加上去的！我再去试试

woodhead

强人也~