emWin使用外部SRAM的方法

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     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。

/*********************************************************************
*                SEGGER Microcontroller GmbH & Co. KG                *
*        Solutions for real time microcontroller applications        *
**********************************************************************
*                                                                    *
*        (c) 1996 - 2013  SEGGER Microcontroller GmbH & Co. KG       *
*                                                                    *
*        Internet: www.segger.com    Support:  support@segger.com    *
*                                                                    *
**********************************************************************


** emWin V5.18 - Graphical user interface for embedded applications **
All  Intellectual Property rights  in the Software belongs to  SEGGER.
emWin is protected by  international copyright laws.  Knowledge of the
source code may not be used to write a similar product.  This file may
only be used in accordance with the following terms:


The software has been licensed to  NXP Semiconductors USA, Inc.  whose
registered  office  is  situated  at 411 E. Plumeria Drive, San  Jose,
CA 95134, USA  solely for  the  purposes  of  creating  libraries  for
NXPs M0, M3/M4 and  ARM7/9 processor-based  devices,  sublicensed  and
distributed under the terms and conditions of the NXP End User License
Agreement.
Full source code is available at: www.segger.com


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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 ****************************/