自己写图形库不怎么完善，而且功能有限，在NIOS II上移植ucGUI，做界面设计就简单了!
当然首先要下载ucGUI源代码，改变TFT LCD设定的参数和读写TFT LCD函数即可。
首先我们要把GUI和Config两个文件夹放到NIOS II工程目录中，改变其只读属性，因为我们要修改文件。
在NIOS II工程名上点击右键选择Refresh就可以看到GUI和Config了，还是在工程上点击右键选择Properties，
添加ucGUI头文件路径，如下图：
修改config文件里面的GUIConf.h如下：
#ifndef GUICONF_H
#define GUICONF_H
#define GUI_OS (0) /* Compile with multitasking support */
#define GUI_SUPPORT_TOUCH (0) /* Support a touch screen (req. win-manager) */
#define GUI_SUPPORT_MOUSE (0) /* Support a mouse */
#define GUI_SUPPORT_UNICODE (0) /* Support mixed ASCII/UNICODE strings */
#define GUI_DEFAULT_FONT &GUI_Font8x16
#define GUI_ALLOC_SIZE 12500 /* Size of dynamic memory ... For WM and memory devices*/
/*********************************************************************
*
* Configuration of available packages
*/
#define GUI_WINSUPPORT 0 /* Window manager package available */
#define GUI_SUPPORT_MEMDEV 0 /* Memory devices available */
#define GUI_SUPPORT_AA 0 /* Anti aliasing available */
#endif /* Avoid multiple inclusion */
修改LCDConf.h如下：
#ifndef LCDCONF_H
#define LCDCONF_H
/*********************************************************************
*
* General configuration of LCD
*
**********************************************************************
*/
#include"io.h"
#include"system.h"
#define SRAM_BASE LCD_BASE + 320*2
#define LCD_XSIZE (320) /* X-resolution of LCD, Logical coor. */
#define LCD_YSIZE (240) /* Y-resolution of LCD, Logical coor. */
#define LCD_BITSPERPIXEL (16) /* 每个象素点需要的Bit数 */
#define LCD_CONTROLLER 3200 /* 控制器名称 */
#define LCD_ENDIAN_BIG 1 /* 选择little endian */
#define LCD_FIXEDPALETTE 565 /* 选择RGB565色彩模式 */
#define LCD_SWAP_RB 1 /* gui默认为GRB565，定义这个开关可以使之转换为RGB565，即交换R和B */
#define LCD_LIN_SWAP 16
//#define LCD_MIRRO_X 1
#define LCD_ALLOW_NON_OPTIMIZED_MODE 1
#define LCD_READ_MEM(Off) IORD_32DIRECT((U32)SRAM_BASE,(U32)(4*Off))
#define LCD_WRITE_MEM(Off,data) IOWR_32DIRECT((U32)SRAM_BASE,(U32)(4*Off),data)
//#define LCD_READ_MEM(Off) *((U32 *)LCD_BASE + (U32)Off)
//#define LCD_WRITE_MEM(Off,data) *((U32 *)LCD_BASE + (U32)Off) = Data;
/* 使用驱动LCDLin32.c需要定义的函数，用于读写显示缓冲区，由于把显示缓冲区的地址指针放到LCDLin32.c中去了，所以这两个函数也直接放到LCDLin32.c中去，在这里就可以不要了 */
#define LCD_INIT_CONTROLLER() LCD_Controller_Init() /* LCD 控制器初始化函数，由gui_init()调用，我在这里替换为自己的控制器初始化函数LCD_Controller_Init()，该函数在后文中叙述 */
#endif
修改LCDDriver/LCDLin32.c的LCD_Controller_Init()函数如下：
void LCD_Controller_Init(void)
{
int i;
for(i=0;i<320*240/2;i++) IOWR_32DIRECT(LCD_BASE,4*i,0);
}
这样直接编译会报错，需要在NIOS II工程目录里面添加一个GUI_X.c的文件，代码如下：
#include "GUI.h"
#include "GUI_X.h"
/*********************************************************************
*
* Global data
*/
volatile int OS_TimeMS;
/*********************************************************************
*
* Timing:
* GUI_X_GetTime()
* GUI_X_Delay(int)
Some timing dependent routines require a GetTime
and delay function. Default time unit (tick), normally is
1 ms.
*/
int GUI_X_GetTime(void)
{
// return OS_TimeMS;
return 0;
}
void GUI_X_Delay(int ms)
{
//int tEnd = OS_TimeMS + ms;
//while ((tEnd - OS_TimeMS) > 0);
}
/*********************************************************************
*
* GUI_X_Init()
*
* Note:
* GUI_X_Init() is called from GUI_Init is a possibility to init
* some hardware which needs to be up and running before the GUI.
* If not required, leave this routine blank.
*/
void GUI_X_Init(void) {}
/*********************************************************************
*
* GUI_X_ExecIdle
*
* Note:
* Called if WM is in idle state
*/
void GUI_X_ExecIdle(void) {}
/*********************************************************************
*
* Logging: OS dependent
Note:
Logging is used in higher debug levels only. The typical target
build does not use logging and does therefor not require any of
the logging routines below. For a release build without logging
the routines below may be eliminated to save some space.
(If the linker is not function aware and eliminates unreferenced
functions automatically)
*/
void GUI_X_Log (const char *s) { GUI_USE_PARA(s); }
void GUI_X_Warn (const char *s) { GUI_USE_PARA(s); }
void GUI_X_ErrorOut(const char *s) { GUI_USE_PARA(s); }