在Spartan3E-500 Nexys2上使用uartlite

Question

我的Nexys2上嵌有一个Microblaze构建版，其中包含一个uartlite端口。我试图让它与液晶屏通信，但没有运气。这是我的代码，有人可以看到任何明显的错误吗？此外，LCD要求将整数发送给它以设置诸如背光，光标发布等内容。我该怎么做？对不起，我对C不太好。

/*
 * Copyright (c) 2009 Xilinx, Inc.  All rights reserved.
 *
 * Xilinx, Inc.
 * XILINX IS PROVIDING THIS DESIGN, CODE, OR INFORMATION "AS IS" AS A
 * COURTESY TO YOU.  BY PROVIDING THIS DESIGN, CODE, OR INFORMATION AS
 * ONE POSSIBLE   IMPLEMENTATION OF THIS FEATURE, APPLICATION OR
 * STANDARD, XILINX IS MAKING NO REPRESENTATION THAT THIS IMPLEMENTATION
 * IS FREE FROM ANY CLAIMS OF INFRINGEMENT, AND YOU ARE RESPONSIBLE
 * FOR OBTAINING ANY RIGHTS YOU MAY REQUIRE FOR YOUR IMPLEMENTATION.
 * XILINX EXPRESSLY DISCLAIMS ANY WARRANTY WHATSOEVER WITH RESPECT TO
 * THE ADEQUACY OF THE IMPLEMENTATION, INCLUDING BUT NOT LIMITED TO
 * ANY WARRANTIES OR REPRESENTATIONS THAT THIS IMPLEMENTATION IS FREE
 * FROM CLAIMS OF INFRINGEMENT, IMPLIED WARRANTIES OF MERCHANTABILITY
 * AND FITNESS FOR A PARTICULAR PURPOSE.
 *
 */

/*
 * helloworld.c: simple test application
 */

#include <stdio.h>
#include "platform.h"
#include "xparameters.h"
#include "mb_interface.h"
#define XPS_UART_0_RX_FIFO_VALID_DATA 0x01
#define XPS_UART_STATUS (*(volatile int*) (XPAR_UARTLITE_0_BASEADDR+8))
#define XPS_UART_RX_FIFO (*(volatile int*) (XPAR_UARTLITE_0_BASEADDR))
#define XPS_UART_TX_FIFO (*(volatile int*) (XPAR_UARTLITE_0_BASEADDR+4))
#define XPS_UART_0_TX_FIFO_FULL 0x08
char getcharacter(void);
void pucharacter(char character);
void putstring(char *stringptr);
void delayms(int ms);

int main()
{
    char character;
    putstring("Hello\n\r");
    while(1){
    //character = getcharacter();
putstring("Hello World");
}
    return 0;
}


char getcharacter(){
        unsigned int status;
        char character;
    while((XPS_UART_0_RX_FIFO_VALID_DATA & XPS_UART_STATUS) ==0){
        status = XPS_UART_STATUS;
        }
    character = XPS_UART_RX_FIFO;
            return character;
    }

void putcharacter(char character){
    unsigned int status;
    while(XPS_UART_0_TX_FIFO_FULL & XPS_UART_STATUS){
        status = XPS_UART_STATUS;
    }
    XPS_UART_TX_FIFO = character;
    }

void putstring(char*stringptr){
    while(*stringptr != 0x00){
            putcharacter(*stringptr);
        stringptr++;
    }
    }

void delayms(int ms){
    int count;
    for(count = 0; count <ms*256; count++){}
    }