rtthread移植nxplpc54102 rt_kprintf 打印异常

    Board_LED_Set(0, true);
        rt_thread_delay(1000);
//    rt_kprintf("LED1_thread running,led_on\n");  
    ROM_UART_Send(hUART, uart_buf2, sizeof(uart_buf2));
    Board_LED_Set(0, false);
    rt_thread_delay(1000);
//    rt_kprintf("LED1_thread running,LED1_off\r\n");
    ROM_UART_Send(hUART, uart_buf3, sizeof(uart_buf3));
void rt_hw_console_output(const char *str)
{
    ErrorCode_t ret;
    rt_enter_critical();
    while(*str !='\0') //×Ö·û´®½áÊø
    {
    if(*str == '\n') //»»ÐÐ
    {
    ret=ROM_UART_Send(hUART, (uint8_t*)'\r', 1);
    if(ret == LPC_OK)    
    {                                                        
             ROM_UART_WaitTx(hUART);
    }
    }
    //SendData
    ret = ROM_UART_Send(hUART, (uint8_t*)(str++), 1);
    if(ret == LPC_OK)    
    {        
        ROM_UART_WaitTx(hUART);
    }
        }
        //exit critical
        rt_exit_critical();
}