ucgui移植

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关于ucgui的移植，网上多是stm32上的或者是带fb设备的板卡上的移植，由于我用的板卡不支持fb，所以整个移植是建立在v4l2的基础上的，由于不懂驱动什么的，纠结了快一个月，磕磕巴巴地终于在昨天成功移植，真的是很感谢热情如火的大神，所以在这里也分享一下自己的移植心得，希望有一天也能帮到某个需要的人。

硬件平台：SEET-DVS6467

UCGUI版本：3.90

下载ucgui源码

----Sample

----Start

----Tool

在做移植的时候，把Sample中的GUI_X中的GUI_X.c、Start中的GUI和Config拷出来放在一个文件夹下。

由于板卡没有framebuffer硬件，所以需要通过v4l2提供显示接口，由此，需要将v4l2和ucgui的LCD驱动接口相连。

需要修改的有四个地方：

1、首先是配置文件，Config中的GUIConf.h和LCDConf.h，

GUIConf主要是图形化界面的相关配置，主要修改如下：

#defineGUI_OS (1) /* Compile with multitasking support */

#defineGUI_SUPPORT_TOUCH (0) /* Support a touch screen (req. win-manager)*/

#defineGUI_SUPPORT_UNICODE (1) /* Support mixed ASCII/UNICODE strings */

#defineGUI_DEFAULT_FONT &GUI_Font6x8

#defineGUI_ALLOC_SIZE 25*1024 /* Size of dynamic memory ... For WM and memory devices*/

#defineGUI_WINSUPPORT 1 /* Window manager package available */

#defineGUI_SUPPORT_MEMDEV 1 /* Memory devices available */

#defineGUI_SUPPORT_AA 1 /* Anti aliasing available */

LCDConf主要是显示器的相关配置，主要修改如下：

#defineLCD_XSIZE (720) /* X-resolution of LCD, Logical coor. */

#defineLCD_YSIZE (576) /* Y-resolution of LCD, Logical coor. */

#defineLCD_BITSPERPIXEL (8)

#defineLCD_CONTROLLER (-1)

2、其次是GUI_X.c中初始化部分，在初始化过程中最关键是要实现v4l2的初始化，申请缓存区，映射到用户空间，将缓存区加入缓存队列（在initDisplay中实现），获得缓存区地址赋给全局变量video_buffer，然后打开流，具体实现如下：

void GUI_X_Init(void) {

int i= 0,ret = 0;

struct v4l2_format display_fmt;

int display_numbuffers= MAX_BUFFER;

char dev[40];

AddrObj *display_buff;

sprintf(dev,"/dev/video%d",2);

/* open display channel */

ret = initDisplay(&display_fd,dev,&display_numbuffers,"COMPOSITE", "PAL",&display_fmt);

if(ret < 0) {

printf("Error in opening display device\n");

return ret;

}

ret = startDisplay(&display_fd);

if(ret < 0) {

printf("Error in starting display\n");

return ret;

}

static int initDisplay(int *display_fd, char *devname, int*numbuffers, char *outputname,char *stdname, struct v4l2_format *fmt)

{

int mode =O_RDWR, j;

structv4l2_buffer buf;

int ret,i=0;

structv4l2_requestbuffers reqbuf;

charcommand[80];

video_buffer=(char*)malloc(sizeof(char)*576*720);

strcpy(command,"echo ");

strcat(command,outputname);

strcat(command," > ");

strcat(command,OUTPUTPATH);

if(system(command)){

printf("Cannot set the output\n");

return -1;

}

/* Set modewhich is same as the one detected in the capture */

strcpy(command, "echo ");

strcat(command, stdname);

strcat(command, " >");

strcat(command, STDPATH);

if(system(command)) {

printf("Cannotset the output\n");

return -1;

}

for(i = 0; i < MAX_BUFFER; i++) {

display_buff_info[i].start= NULL;

}

/* Open the channel-2 displaydevice */

*display_fd= open((const char *)devname, mode);

if(*display_fd<= 0) {

printf("Cannotopen %s\n",devname);

return-1;

}

reqbuf.type= V4L2_BUF_TYPE_VIDEO_OUTPUT;

reqbuf.count= *numbuffers;

reqbuf.memory= V4L2_MEMORY_MMAP;

ret =ioctl(*display_fd, VIDIOC_REQBUFS, &reqbuf);

if (ret< 0) {

perror("cannotallocate memory\n");

return-1;

}

/* Storethe numbfer of buffers allocated */

*numbuffers= reqbuf.count;

/* It isbetter to zero all the members of buffer structure */

memset(&buf,0, sizeof(buf));

/* Mmap thebuffers

* To access driver allocated buffer inapplication space, they have

* to be mmapped in the application space usingmmap system call */

for(i = 0 ;i < reqbuf.count ; i ++) {

/*Query physical address of the buffers */

buf.index= i;

buf.type= V4L2_BUF_TYPE_VIDEO_OUTPUT;

buf.memory = V4L2_MEMORY_MMAP;

ret= ioctl(*display_fd, VIDIOC_QUERYBUF, &buf);

if(ret < 0) {

perror("VIDIOC_QUERYCAP\n");

return-1;

}

/*Mmap the buffers in application space */

display_buff_info[i].length= buf.length;

display_buff_info[i].index= i;

display_buff_info[i].start=

mmap(NULL,buf.length, PROT_READ | PROT_WRITE,

MAP_SHARED,*display_fd, buf.m.offset);

if((unsigned int) display_buff_info[i].

start == MAP_SHARED) {

printf("Cannotmmap = %d buffer\n", i);

return-1;

}

display_buff_phy[i]=buf.m.offset;

/*It is better to zero buffers */

memset(display_buff_info[i].start,0x80,

display_buff_info[i].length);

printf("%d\n",display_buff_info[i].length);

}

video_buffer=display_buff_info[buf.index].start;

printf("phy=%x\n",display_buff_phy[buf.index]);

printf("vir=%x\n",video_buffer);

/* Enqueuebuffers

* Before starting streaming, all the buffersneeds to be en-queued

* in the driver incoming queue. */

/* Enqueuebuffers */

for (i = 0;i < reqbuf.count; i++) {

buf.type= V4L2_BUF_TYPE_VIDEO_OUTPUT;

buf.memory = V4L2_MEMORY_MMAP;

buf.index= i;

ret= ioctl(*display_fd, VIDIOC_QBUF, &buf);

if(ret < 0) {

perror("VIDIOC_QBUF\n");

return-1;

}

fmt->type= V4L2_BUF_TYPE_VIDEO_OUTPUT;

ret =ioctl(*display_fd, VIDIOC_G_FMT, fmt);

if(ret <0) {

perror("VIDIOC_G_FMT\n");

return-1;

}

printf("width=%d,heigth=%d\n",fmt->fmt.pix.width,fmt->fmt.pix.height);

return 0;

}

3、由于V4L2是输入输出实际就是在维护一个缓存区队列，所以在对缓存区进行修改后，需要放进队列中，并且在队列中获取新的一个缓存区，所以还需要修改GUI/Core/GUI_Exec.c，

int GUI_Exec(void) {

int r = 0;

while (GUI_Exec1()) {

r = 1; /* We have done something */

}

if(r==1)

{

AddrObj *display_buff;

int ret=0;

ret = putDisplayBuffer(&display_fd, 3,video_buffer);

if(ret < 0) {

printf("Error in put displaybuffer\n");

return ret;

}

display_buff=getDisplayBuffer(&display_fd);

if(NULL == display_buff) {

printf("Error in get displaybuffer\n");

return ret;

}

return r;

}

4、最后需要做的就是重写LCD驱动函数，其实需要重写的只有两个，分别是LCD_L0_GetPixelIndex和LCD_L0_SetPixelIndex，利用前面得到的用户空间地址video_buffer进行读写

LCD_L0_GetPixelIndex修改如下：

/* Read fromhardware ... Adapt to your system */

{

PixelIndex = video_buffer[yPhys*720+xPhys];

}

类似的，LCD_L0_SetPixelIndex的修改如下：

/* Write into hardware ... Adapt to yoursystem */

{

video_buffer[yPhys*720+xPhys]=PixelIndex;

}

至此，ucgui的移植修改全部结束。需要注意的是，video_buffer应该是char类型，因为我的显示器是8bpp，之前因为设的是int产生了横向的偏移。

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