基于ARM 9板显示图像 [英] Displaying an image on ARM 9 board

问题描述

我需要一个嵌入式系统上显示图像。该板配置如下：

I need to display images on an embedded system. The board configuration is as follows:

这是AT91SAM9263-EK，与它运行Linux 2.6.20内核。是否有此board.The处理器的图像处理库是ARM926EJ-S。

It is AT91sam9263-EK, with Linux 2.6.20 kernel running on it. Are there any image processing libraries for this board.The processor is ARM926EJ-S.

谢谢大家。

推荐答案

如果帧缓冲区不是在Linux操作系统启动你有我知道这是通过的 Linux4Sam 。你总是可以尝试，如果它是通过发出命令猫/ bin / sh的＆GT激活;为/ dev / fb0设备;随机模式应出现在屏幕（请注意，它可能需要激活背光 - 如果它被关闭，你可能无法看到所有东西）上。您可能需要杀死的目标第一次运行图形环境。

If the framebuffer isn't activated in the Linux OS you got I know that it is in the Linux OS provided by Linux4Sam. You can always try if it is activated by issuing the command cat /bin/sh > /dev/fb0; a random pattern should appear on the screen (note that it might be necessary to activate the backlight - if it is turned off you might not see anything at all). You might have to kill the graphical environment that is running on target first.

如果你想要做的是，通过打开帧缓冲（的/ dev / fb0设备）来显示图像，可以做到和写入（或只是猫吧）;但你必须有正确的格式的图像。如果我没有记错的评估板帧缓冲是一个RGB555（即5对绿，红，5位，蓝色5位位）。

If all you want to do is to display an image it is possible to do that by opening the framebuffer (/dev/fb0) and write to it (or just cat it); but you have to have an image in the correct format. If I remember correctly the framebuffer in the evaluation board is a RGB555 (i.e. 5 bits for red, 5 bits for green and 5 bits for blue).

如果你想使用你必须使用一个具有帧缓冲后端一个GUI库。在一个标准的Linux系统的GUI库假定您已经安装了X，但他们中的一些也有framebuffer的后端。 Qt的，例如可以以这样的方式被编译（但我认为你必须修改它以提供正确的色彩信息;它仅支持RGB565开箱即用）。 DirectFB的是一个简单的解决方案，提供了基本的图形支持（但它对于FreeType的给你很好的字体支持支持）。见上面其他的例子提供的链接。

If you want to use a GUI library you have to use one that has a framebuffer backend. On a standard Linux system a GUI library assumes that you have X installed but some of them also have framebuffer backends. Qt for instance can be compiled in such a way (but I think you have to modify it to provide the correct color information; it only supports RGB565 out of the box). DirectFB is a simpler solution that provides basic graphic support (but it has support for FreeType giving you good font support). See the links provided above for other examples.

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