Query:How to change brightness of a screen(framebuffer) using Qtopia ?

[sureshgani1984]

Hi All,
I have been developed a GUI for WIreless access point which is displaying on the LCD(framebuffer) screen, that GUI has LCD settings options like brightness, contrast and sharpness.

Here when I run GUI the Qtopia will open framebuffer device and writes GUI data to it, So how can I get that file descriptor to call proper ioctl's in my program to change brightness, contrast and sharp. Or otherwise can I open the same framebuffer device again and use that file descriptor?

Please help out on this issue.

Thanks in advance
Suresh S Gani

[QbelcorT]

Hi,
I was able to access the device directly using the /dev/fb. This is a simple routine for blanking the LCD.

int lcdBlank(bool val)
{
                int fbfd;
	int blank = 0;
	int ret = 0;
 
	if(val == true)
		blank = FB_BLANK_POWERDOWN;
	else
		blank = FB_BLANK_UNBLANK;
 
	fbfd = open(FBDEVFILE, O_RDWR);
	if(fbfd < 0)
	{
		printf("Could Not Open FB for blanking\n");
		return -1;
	}
 
	ret = ioctl(fbfd,FBIOBLANK, &blank);
	if (ret < 0) 
		printf("Could not exe IOCTL for blanking lcd\n");
 
	close(fbfd);
	return ret;
}

int lcdBlank(bool val)
{
                int fbfd;
	int blank = 0;
	int ret = 0;

	if(val == true)
		blank = FB_BLANK_POWERDOWN;
	else
		blank = FB_BLANK_UNBLANK;

	fbfd = open(FBDEVFILE, O_RDWR);
	if(fbfd < 0)
	{
		printf("Could Not Open FB for blanking\n");
		return -1;
	}
	
	ret = ioctl(fbfd,FBIOBLANK, &blank);
	if (ret < 0) 
		printf("Could not exe IOCTL for blanking lcd\n");
                 
	close(fbfd);
	return ret;
}

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