当配置PICMZ启动套件与MEB2使用图形库时可以定义图形而不使用SRAM吗？

视频缓冲器可以是内部RAM或外部RAM芯片。我认为外部可以使用外部RAM进行存储，因为它可以双缓冲。



      以下为原文

    The video buffer can be the internal RAM or the external RAM chip.
I think the external you can use the external ram for storage too since it can double buffer.

是的，您可以使用MHC定义SRAM使用（内部或外部）。我们有两个应用实例。内部SRAM足够大，可以处理单个缓冲函数（WQVGA）。如果它不经常重画整个屏幕，这可能是足够好的来完成图形功能。在V2.03B中，我们有一些更好的例子（即将到来）。即使是WVGA，外部SRAM也可以处理双缓冲。除了软件设置外，请注意跳线（J9，MEB2板的底部）。它必须在物理上改变以从内部移动到外部。如果不是，结果看起来将是一个白色屏幕（背光灯只）。是的，你可以使用SRAM的未分配部分用于其他目的。



      以下为原文

    Yes, you can define the SRAM usage (internal or external) using MHC.  We have applications examples for both.
 
The internal SRAM is large enough to handle a single buffer function (WQVGA).  This may be good enough for doing your graphics function, if it does not repaint the whole screen often.  In Harmony v2.03b we have some better examples of this (coming soon).
 
The external SRAM can handle double buffering even for WVGA. 
 
In addition to the software setting, please pay attention to the jumper (J9, bottom side of the MEB2 board).  It must be physically changed to move from internal to external.  If not the result will appear to be a white screen (backlight on only).
 
Yes, you can use the unallocated portion of either SRAM for other purposes.

谢谢你的答案。现在我试着把数组映射到外部SRAM，像这样。{ PrimaMeListName =“ExtXMeM”原点＝0xC000 0大小＝0x1000未签名int MyWord（2）α属性（（EXTAXMEM））；由于某些原因，它不起作用。如果我使用指针到外部内存地址，它工作正常。我是什么？错了吗？



      以下为原文

    Thanks for the answer.
 
Now i'm trying to map an array to external SRAM like this.
 
#pragma region name="ext_mem" origin=0xC0000000 size=0x1000
unsigned int MyWord[2] __attribute__((region("ext_mem")));
 
For some reason it's not working.
If i use pointer to external memory address it works fine.
 
What am i doing wrong?