各位大侠，小弟现在在搞一块LPC1114的板子，用的坏境是IAR6.3，在测试uart时，发现用IAR上自带的例程可以收发，例程是用中断将受到的数据在用查询发回电脑。但是我自己加了个发字节的函数都总是发不了，请同事也看过了，也找不到原因。现在有点困扰，想请大家帮忙看看。
附上代码 除了 UARTSendByte 其他都是例程自带的。
中断处理/*****************************************************************************
** Function name: UART0_IRQHandler
**
** Descriptions: UART interrupt handler
**
** parameters: None
** Returned value: None
**
*****************************************************************************/
#pragma diag_suppress=Pa082
void UART0_IRQHandler(void)
{
uint8_t IIRValue, LSRValue;
uint8_t Dummy = Dummy;
IIRValue = LPC_UART->IIR; // interrupt ID Register
IIRValue >>= 1; /* skip pending bit in IIR */
IIRValue &= 0x07; /* check bit 1~3, interrupt identification */
if (IIRValue == IIR_RLS) /* Receive Line Status */
{
LSRValue = LPC_UART->LSR; /* Receive Line Status */
if (LSRValue & (LSR_OE | LSR_PE | LSR_FE | LSR_RXFE | LSR_BI))
{
/* There are errors or break interrupt */
/* Read LSR will clear the interrupt */
UARTStatus = LSRValue;
Dummy = LPC_UART->RBR; /* Dummy read on RX to clear
interrupt, then bail out */
return;
}
if (LSRValue & LSR_RDR) /* Receive Data Ready */
{
/* If no error on RLS, normal ready, save into the data buffer. */
/* Note: read RBR will clear the interrupt */
UARTBuffer[UARTCount++] = LPC_UART->RBR;
if (UARTCount == BUFSIZE)
{
UARTCount = 0; /* buffer overflow */
}
}
}
else if (IIRValue == IIR_RDA) /* Receive Data Available */
{
/* Receive Data Available */
UARTBuffer[UARTCount++] = LPC_UART->RBR;
if (UARTCount == BUFSIZE)
{
UARTCount = 0; /* buffer overflow */
}
}
else if (IIRValue == IIR_CTI) /* Character timeout indicator */
{
/* Character Time-out indicator */
UARTStatus |= 0x100; /* Bit 9 as the CTI error */
}
else if (IIRValue == IIR_THRE) /* THRE, transmit holding register empty */
{
/* THRE interrupt */
LSRValue = LPC_UART->LSR; /* Check status in the LSR to see if
valid data in U0THR or not */
if (LSRValue & LSR_THRE)
{
UARTTxEmpty = 1;
}
else
{
UARTTxEmpty = 0;
}
}
return;
}
#pragma diag_default=Pa082
*****************************************************************************
** Function name: UARTSend
**
** Descriptions: Send a block of data to the UART 0 port based
** on the data length
**
** parameters: buffer pointer, and data length
** Returned value: None
**
*****************************************************************************/
void UARTSend(uint8_t *BufferPtr, uint32_t Length)
{
while ( Length != 0 )
{
/* THRE status, contain valid data */
#if !TX_INTERRUPT
LPC_UART->THR = *BufferPtr;
while ( !(LPC_UART->LSR & LSR_THRE) ); //polling
#else
/* Below flag is set inside the interrupt handler when THRE occurs. */
while ( !(UARTTxEmpty & 0x01) );
LPC_UART->THR = *BufferPtr;
UARTTxEmpty = 0; /* not empty in the THR until it shifts out */
#endif
BufferPtr++;
Length--;
}
return;
}
/*****************************************************************************
** Function name: UARTSendByte
**
** Descriptions: Send a block of data to the UART 0 port based
** on the data length
**
** parameters: buffer pointer, and data length
** Returned value: None
**
*****************************************************************************/
void UARTSendByte(uint8_t dat)
{
LPC_UART->THR = dat;
while ( !(LPC_UART->LSR & LSR_THRE) ); //polling
}
int main (void) {
SystemInit();
/* NVIC is installed inside UARTInit file. */
UARTInit(9600);
#if MODEM_TEST
ModemInit();
#endif
UARTSendByte(0xaa);
while (1)
{
/* Loop forever */
if ( UARTCount != 0 )
{
LPC_UART->IER = IER_THRE | IER_RLS; /* Disable RBR */
UARTSendByte(0xaa);
UARTSend( (uint8_t *)UARTBuffer, UARTCount );
UARTCount = 0;
LPC_UART->IER = IER_THRE | IER_RLS | IER_RBR; /* Re-enable RBR */
}
}
}
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