emWin使用外部SRAM的方法

我用的是stm32，加了1MB的外部SRAM，在使用emWin的时候，将一部分内存分配给emWin使用。其实方法很简单，传入SRAM数据总线地址即可，数据位宽我采用16bit，因为使用的SRAM是16bit的，这样做比较合适。如果是在ARM9及以上的平台上使用，依葫芦画瓢的把DDRAM的物理地址传入emWin即可，不过地址位宽一般是32位的，大小由自己决定。

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** emWin V5.18 - Graphical user interface for embedded applications **
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----------------------------------------------------------------------
File        : GUIConf.c
Purpose     : Display controller initialization
---------------------------END-OF-HEADER------------------------------
*/

#include "GUI.h"
#include "SRAM_Driver.h"
/*********************************************************************
*
*       Defines
*
**********************************************************************
*/
//
// Define the available number of bytes available for the GUI
//

#define Bank1_SRAM3_ADDR    ((u32)0x68000000)

#define GUI_NUMBYTES  (1024*700)
//
// Define the average block size
//
#define GUI_BLOCKSIZE 0x80

/*********************************************************************
*
*       Public code
*
**********************************************************************
*/
/*********************************************************************
*
*       GUI_X_Config
*
* Purpose:
*   Called during the initialization process in order to set up the
*   available memory for the GUI.
*/
void GUI_X_Config(void) {
  //
  // 16 bit aligned memory area
  //
   volatile U16* aMemory = (volatile U16*)(Bank1_SRAM3_ADDR);
  //
  // Assign memory to emWin
  //
  GUI_ALLOC_AssignMemory((void*)aMemory, GUI_NUMBYTES);
  GUI_ALLOC_SetAvBlockSize(GUI_BLOCKSIZE);
  //
  // Set default font
  //
  GUI_SetDefaultFont(GUI_FONT_6X8);
}

/*************************** End of file ****************************/