买了一个友善之臂的mini2440的板子,

2440都是玩linux 或者 wince的,而且即使是裸奔 也在ads上面,我十分不爽ads,

喜欢IAR(在avr上面,编译质量一流gcc无法比),MDK(keil的51),因为前段时间学习stm32,所以安装了mdk的环境,所以目标用mdk来移植ucos

但是我先想移植ucos过去,

习惯的单片机的从底层往上走的思想,在这里发表博客 就是为了使得自己一步一步往上走

首先来玩点亮一个 led

led的连线为 nXBACK/GPB5 --led--res--vdd3.3v

首先创建一个 2440的项目

Project-->New uVision Project  名称为 2440_led   

然后cpu选择 s3c2440a

采用mdk默认的启动代码

(这个代码有点不爽的,他是以用户模式进入main函数的,在用户模式修改cache是会出错误的,但是可以点亮led,先点灯再说)

以下是各种设置

定义程序在内存中的位置,

UploadFiles/2009-12/201424230363.jpg

定义使用J-LINK进行调试

UploadFiles/2009-12/201427565240.jpg

定义下载到ram中运行,不用烧录flash

UploadFiles/2009-12/201428964263.jpg

在J-LINK设置的时候 要对系统进行一次初始化 使用文件   Ext_RAM.ini

因为J-LINK  要将程序下载到sdram中,cpu必须将sdram进行设置,线宽,等待时间等等

文件如下:

/******************************************************************************/
/* Ext_RAM.INI: External RAM (SDRAM) Initialization File                      */
/******************************************************************************/
// <<< Use Configuration Wizard in Context Menu >>>                           //
/******************************************************************************/
/* This file is part of the uVision/ARM development tools.                    */
/* Copyright (c) 2005-2008 Keil Software. All rights reserved.                */
/* This software may only be used under the terms of a valid, current,        */
/* end user licence from KEIL for a compatible version of KEIL software       */
/* development tools. Nothing else gives you the right to use this software.  */
/******************************************************************************/

FUNC void SetupForStart (void) {

// <o> Program Entry Point
  PC = 0x30000000;
}

FUNC void Init (void) {

  _WDWORD(0x53000000, 0x00000000);      // Disable Watchdog Timer
  _WDWORD(0x4A000008, 0xFFFFFFFF);      // Disable All Interrupts
  _WDWORD(0x4A00001C, 0X000007FF);
 
                                        // Clock Setup
                                        // FCLK = 300 MHz, HCLK = 100 MHz, PCLK = 50 MHz
  _WDWORD(0x4C000000, 0x00FFFFFF);      // LOCKTIME
  _WDWORD(0x4C000004, 0x0005C042);      // MPLLCON

                                        // Memory Controller Setup for SDRAM
  _WDWORD(0x48000000, 0x22111120);      // BWSCON
  _WDWORD(0x48000004, 0x00000700);      // BWSCON
  _WDWORD(0x48000008, 0x00000700);      // BWSCON
  _WDWORD(0x4800000C, 0x00000700);      // BWSCON
  _WDWORD(0x48000010, 0x00000700);      // BWSCON
  _WDWORD(0x48000014, 0x00000700);      // BWSCON
  _WDWORD(0x48000018, 0x00000700);      // BWSCON
  _WDWORD(0x4800001C, 0x00018005);      // BWSCON
  _WDWORD(0x48000020, 0x00018005);      // BWSCON
  _WDWORD(0x48000024, 0x008E0459);      // BWSCON
  _WDWORD(0x48000028, 0x00000032);      // BWSCON
  _WDWORD(0x4800002C, 0x00000030);      // BWSCON
  _WDWORD(0x48000030, 0x00000030);      // BWSCON

  //_WDWORD(0x56000000, 0x000003FF);      // GPACON: Enable Address lines for SDRAM
}

// Reset chip with watchdog, because nRST line is routed on hardware in a way
// that it can not be pulled low with ULINK

_WDWORD(0x40000000, 0xEAFFFFFE);        // Load RAM addr 0 with branch to itself
CPSR = 0x000000D3;                      // Disable interrupts
PC   = 0x40000000;                      // Position PC to start of RAM
_WDWORD(0x53000000, 0x00000021);        // Enable Watchdog
g, 0                                    // Wait for Watchdog to reset chip

Init();                                 // Initialize memory
LOAD Led.axf INCREMENTAL         // Download program
SetupForStart();                        // Setup for Running
g, main                                 // Goto Main

准备工作差不多了,下面开始写自己的程序了

#include <S3C2440.h>
int  main (void)
{
    int i;

    GPBCON &=~((0x03L)<<10);GPBCON |=(0x01L)<<10 ;
    GPBDAT &= ~(1<<5);

    while (1){
        //GPBDAT |= 1;
     GPBDAT &= ~(1<<5);
        for (i = 0; i < 200000; i++);
        //GPBDAT &= ~1;
     GPBDAT |= (1<<5);
        for (i = 0; i < 200000; i++);
    }
 //return  0;
}

由axf 生成 bin

UploadFiles/2009-12/20155644795.jpg