彼岸战士

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彼岸战士发布于 2013-05-09 10:14:40

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无法打开3531的fb0

海思

我在加载了hifb.ko后，出现了fb0-fb6，但是写程序是无法open打开fb0，请问这是为什么呢？

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david

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david 2013-05-09 15:13:09

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dev目录下是否有对应设备？

彼岸战士

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彼岸战士 2013-05-09 19:15:58

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[quote]david 发表于 2013-5-9 15:13 [url=forum.php?mod=redirect&goto=findpost&pid=3015&ptid=1698][img]static/image/common/back.gif[/img][/url]
dev目录下是否有对应设备？[/quote]

有，cat的时候cat: can't open 'fb0': Operation not permitted，编写程序open的时候也提示这个。

hilinux

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hilinux 2013-05-17 20:58:44

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海思对framebuffer的操作做了限制，和15的有点不同了，系统起来要先初始化对应的VO设备，这样才能操作fb

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彼岸战士 2013-05-21 14:08:30

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[quote]hilinux 发表于 2013-5-17 20:58 [url=forum.php?mod=redirect&goto=findpost&pid=3060&ptid=1698][img]static/image/common/back.gif[/img][/url]
海思对framebuffer的操作做了限制，和15的有点不同了，系统起来要先初始化对应的VO设备，这样才能操作fb[/quote]

恩，我现在能打开了，也初始化了framebuffer，是按照sample里的hifb例程中第二个线程初始化的framebuffer，但是我写了个qt程序，把初始化和qt界面写在了一起，但是vga屏上还是不能显示qt的界面，是不是还需要设置一些参数呢？

shensifeng2011

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shensifeng2011 2014-01-15 14:43:32

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我单写了一个程序就是在framebuffer上显示一张图片我这个程序哪有问题吗  帮忙看下

#include
#include
#include
#include
#include
#include "inc/hifb.h"
#define IMAGE_WIDTH 362
#define IMAGE_HEIGHT 254
#define IMAGE_SIZE (362 * 254 * 2)
#define IMAGE_NUM 14
//#define IMAGE_PATH "/0705-yinxr/%d.bmp"
#define IMAGE_PATH "/0705-yinxr/blui_update.bmp"

static struct fb_bitfield g_r16 = {10, 5, 0};
static struct fb_bitfield g_g16 = {5, 5, 0};
static struct fb_bitfield g_b16 = {0, 5, 0};
static struct fb_bitfield g_a16 = {15, 1, 0};

/*bit area for argb 8888*/
static struct fb_bitfield g_r32 = {16, 8, 0};
static struct fb_bitfield g_g32 = {8, 8, 0};
static struct fb_bitfield g_b32 = {0, 8, 0};
static struct fb_bitfield g_a32 = {24, 8, 0};

int main()
{
int fd;
int i = 0;
struct fb_fix_screeninfo fix;
struct fb_var_screeninfo var;
unsigned char *pShowScreen;
unsigned char *pHideScreen;
HIFB_POINT_S stPoint = {100, 0};
HIFB_ALPHA_S stAlpha;

FILE *fp;
char image_name[128];

/*1. open Framebuffer device overlay 0*/
fd = open("/dev/fb0", O_RDWR);
if(fd < 0)
{
      printf("open fb0 failed!\n");
      return -1;
}

/*2. set the screen original position*/
stPoint.s32XPos = 0;
stPoint.s32YPos = 0;
if (ioctl(fd, FBIOPUT_SCREEN_ORIGIN_HIFB, &stPoint) < 0)
{
      printf("set screen original show position failed!\n");
      return -1;
}

#if 1
stAlpha.bAlphaEnable = HI_TRUE;
stAlpha.bAlphaChannel = HI_TRUE;
stAlpha.u8Alpha0 = 0xff;
stAlpha.u8Alpha1 = 0xff;
stAlpha.u8GlobalAlpha = 0xff;
#endif
if (ioctl(fd, FBIOPUT_ALPHA_HIFB,  &stAlpha) < 0)
{
      printf("Set alpha failed!\n");
close(fd);
      return HI_NULL;
}
/*3. get the variable screen info*/
if (ioctl(fd, FBIOGET_VSCREENINFO, &var) < 0)
{
      printf("Get variable screen info failed!\n");
      close(fd);
      return -1;
}
/*4. modify the variable screen info
         the screen size: IMAGE_WIDTH*IMAGE_HEIGHT
         the virtual screen size: IMAGE_WIDTH*(IMAGE_HEIGHT*2)
         the pixel format: ARGB1555
         */
#if 1
var.xres = 1920;
var.yres = 1080;
var.xres_virtual = 1920;
var.yres_virtual = 1080 * 2;
var.transp= g_a16;
var.red = g_r16;
var.green = g_g16;
var.blue = g_b16;
var.bits_per_pixel = 16;

#else
var.xres_virtual = 1920;
var.yres_virtual = 960;
var.xres = 1920;
var.yres = 960;
var.transp= g_a32;
var.red = g_r32;
var.green = g_g32;
var.blue = g_b32;
var.bits_per_pixel = 32;
var.activate = FB_ACTIVATE_NOW;
#endif

/*5. set the variable screeninfo*/
if (ioctl(fd, FBIOPUT_VSCREENINFO, &var) < 0)
{
      printf("Put variable screen info failed!\n");
      close(fd);
      return -1;
}

/*6. get the fix screen info*/
if (ioctl(fd, FBIOGET_FSCREENINFO, &fix) < 0)
{
      printf("Get fix screen info failed!\n");
      close(fd);
      return -1;
}

/*7. map the physical video memory for user use*/
pShowScreen = mmap(NULL, fix.smem_len, PROT_READ|PROT_WRITE, MAP_SHARED, fd, 0);
pHideScreen = pShowScreen + IMAGE_SIZE;
memset(pShowScreen, 0, IMAGE_SIZE);

/*8. load the bitmaps from file to hide screen and set pan display the
         hide screen*/
//for(i = 0; i < IMAGE_NUM; i++)
{
      sprintf(image_name, IMAGE_PATH);
      fp = fopen(image_name, "rb");
      if(NULL == fp)
      {
         printf("Load %s failed!\n", image_name);
         close(fd);
         return -1;
      }
      fread(pHideScreen, 1, IMAGE_SIZE, fp);
      fclose(fp);
#if 1
      if(1 % 2)
      {
         var.yoffset = 0;
         pHideScreen = pShowScreen + IMAGE_SIZE;
      }
      else
      {
         var.yoffset = IMAGE_HEIGHT;
         pHideScreen = pShowScreen;
      }
#endif

      if (ioctl(fd, FBIOPAN_DISPLAY, &var) < 0)
      {
         printf("FBIOPAN_DISPLAY failed!\n");
         close(fd);
         return -1;
      }
}

printf("Enter to quit!\n");
getchar();

/*9. close the Framebuffer device*/
close(fd);
return 0;
}

彼岸战士

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彼岸战士 2014-01-16 13:10:00

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stAlpha.bAlphaEnable  = HI_TRUE;
stAlpha.bAlphaChannel = HI_FALSE;
stAlpha.u8Alpha0    = 0xff;
stAlpha.u8Alpha1    = 0xff;
stAlpha.u8GlobalAlpha = 0x80;
试试？

shensifeng2011

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shensifeng2011 2014-01-20 11:08:09

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[quote][url=forum.php?mod=redirect&goto=findpost&pid=3098&ptid=1698]彼岸战士发表于 2013-5-21 14:08[/url]
恩，我现在能打开了，也初始化了framebuffer，是按照sample里的hifb例程中第二个线程初始化的framebuffer ...[/quote]

你程序里面是不是要读取图片显示什么的，图片显示有头信息，还有图片信息两部分，我写的是c程序，显示不出来是图片的位不对，头信息没读，主要原因还是对例子程序没读透。