LPC824的串口收发数据异常

调试串口0收发数据，用调试助手发12345678，但接受到8个1，大神帮忙看一下！！

#include "LPC8xx.h"
#include
#include
#define UART_BPS       9600
#define BUFFSIZE       64
#define tiME          (3.5*10)/UART_BPS
volatile  uint8_t UART0_GucRcvNew;
uint8_t    UART0_GucRcvBuf[BUFFSIZE];
uint8_t    UART0_GucRcvProcess[BUFFSIZE];
uint32_t Gul0Num;
uint32_t Sen0Num;

void UARTInit (void)
{
LPC_SWM->PINASSIGN[0] &= ~( 0xFFFF << 0 );
LPC_SWM->PINASSIGN[0] |=  ( 4 << 0 );
LPC_SWM->PINASSIGN[0] |=  ( 0 << 8 );

LPC_SYSCON->UARTCLKDIV    = 1;
LPC_SYSCON->SYSAHBCLKCTRL |= (1 << 14);

LPC_USART0->BRG = SystemCoreClock * LPC_SYSCON->SYSAHBCLKDIV /
                  (LPC_SYSCON->UARTCLKDIV * 16 * UART_BPS) - 1;
LPC_USART0->CFG = (1 << 0) |
                  (1 << 2) |
                  (0 << 4) |
                  (0 << 6);

LPC_USART0->INTENSET = (1 << 0);
NVIC_EnableIRQ(UART0_IRQn);
      NVIC_SetPriority(UART0_IRQn,5);
}

void UART0_IRQHandler (void)
{
LPC_MRT->CHANNEL[0].INTVAL  = SystemCoreClock*TIME;
LPC_MRT->CHANNEL[0].INTVAL |= 1UL << 31;
if (LPC_USART0->STAT & 0x01)
{
      UART0_GucRcvBuf[Gul0Num] = LPC_USART0->RXDATA;
                        Gul0Num++;
                        Sen0Num=Gul0Num;
                        LPC_MRT->CHANNEL[0].INTVAL  = SystemCoreClock*TIME;
                        LPC_MRT->CHANNEL[0].INTVAL |= 1UL << 31;

void UART0SendByte (uint8_t ucData)
{
while ((LPC_USART0->STAT & 0x04) == 0);
LPC_USART0->TXDATA = ucData;
while ((LPC_USART0->STAT & 0x08) == 0);
}

void UART0SendString (uint8_t *pucData, uint32_t uiLen)
{
      uint32_t i;
      for(i=0;i       {
               UART0SendByte(*pucData);
      }
}


void MRTInit (void)
{
LPC_SYSCON->SYSAHBCLKCTRL |=  (1 << 10);
LPC_SYSCON->PRESETCTRL &= ~(1 << 7);
LPC_SYSCON->PRESETCTRL |=  (1 << 7);
LPC_MRT->CHANNEL[0].CTRL = (1 << 0) | (1 << 1);
NVIC_EnableIRQ(MRT_IRQn);
      NVIC_SetPriority(UART0_IRQn,4);
}

/*********************************************************************************************************
** Function name:    MRT_IRQHandler
** Descriptions:       MRTÖÐ¶Ï·þÎñº¯Êý
** input parameters: ÎÞ
** output parameters: ÎÞ
** Returned value:    ÎÞ
*********************************************************************************************************/
void MRT_IRQHandler (void)
{
      uint32_t i;
LPC_MRT->CHANNEL[0].STAT = (1 << 0);
      UART0_GucRcvNew=1;
for(i=0;i                      {
                              UART0_GucRcvProcess=UART0_GucRcvBuf;
                     }
Gul0Num=0;
LPC_MRT->CHANNEL[0].INTVAL  = 0;
LPC_MRT->CHANNEL[0].INTVAL |= 1UL << 31;                      关闭定时器
}

int main (void)
{
SystemInit();
UARTInit();
MRTInit();
// GuiNum=0;
//       GucRcvNew=0;
while (1)
            {
                     if(UART0_GucRcvNew==1)
         {

                                                      UART0_GucRcvNew=0;
                                          UART0SendString (UART0_GucRcvProcess,Sen0Num);
                                 }
}
}