zoukankan      html  css  js  c++  java
  • 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。

    /*********************************************************************
    *                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
    
    
    We appreciate your understanding and fairness.
    ----------------------------------------------------------------------
    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 ****************************/


  • 相关阅读:
    easyui 单元格超出鼠标放上弹出全部
    EasyUI datagrid单元格文本超出显示省略号,鼠标移动到单元格显示文本
    easyui 回车搜索
    js控制easyui文本框例子及控制html例子
    Android错误---NoClassDefFoundError: org.ksoap2.transport.HttpTransportSE
    [Android错误]The literal 100000000000000 of type int is out of range
    Eclipse错误:Conversion to Dalvik format failed with error 1
    Android微信分享音乐加网络图片失败分析
    android.view.WindowManager$BadTokenException异常
    Android错误--Attempted to add application window with unknown token
  • 原文地址:https://www.cnblogs.com/java20130723/p/3211364.html
Copyright © 2011-2022 走看看