最近在使用mini2440做开发，网上很多教程和实际操作不太一致，导致入门花费时间长。经过整理，目前mini2440点亮led灯方法有，keil mdk，linux环境编译，使用minitools下载即可。
mini2440分为nor flash和nand flash两种，一般小于4k程序可以直接运行，大于4K的程序需要预先加载引导程序，从存储位置拷贝至内存中。下面来说说mini2440究竟是如何点亮led灯的。
方法一：使用keil mdk的方式，首先下载MDK，使keil包含s3c2440这款芯片。根据该芯片创建工程，添加S3C2440.S文件。工程创建完成后，编写led.c文件代码如下
#define rGPBCON (*(volatile unsigned long *)0x56000010)
#define rGPBDAT (*(volatile unsigned long *)0x56000014)
#define rGPBUP (*(volatile unsigned long *)0x56000018)
#define GPB5_IN ~(3<<10)
#define GPB6_IN ~(3<<12)
#define GPB7_IN ~(3<<14)
#define GPB8_IN ~(3<<16)
#define GPB5_OUT (1<<10)
#define GPB6_OUT (1<<12)
#define GPB7_OUT (1<<14)
#define GPB8_OUT (1<<16)
#define LED1_ON ~(1<<5)
#define LED2_ON ~(1<<6)
#define LED3_ON ~(1<<7)
#define LED4_ON ~(1<<8)
#define LED1_OFF (1<<5)
#define LED2_OFF (1<<6)
#define LED3_OFF (1<<7)
#define LED4_OFF (1<<8)
void Led_Port_Init(void);
void Delay(int tt);
void main()
{
Led_Port_Init();
rGPBDAT |= (LED1_OFF|LED2_OFF|LED3_OFF|LED4_OFF);
rGPBDAT |= (LED1_OFF|LED2_OFF|LED3_OFF|LED4_OFF);
while(1)
{
rGPBDAT = rGPBDAT&(LED1_ON);
Delay(10);
rGPBDAT = rGPBDAT|((LED1_OFF)|(LED2_OFF)|(LED3_OFF)|(LED4_OFF));
Delay(10);
rGPBDAT = rGPBDAT&(LED2_ON);
Delay(10);
rGPBDAT = rGPBDAT|((LED1_OFF)|(LED2_OFF)|(LED3_OFF)|(LED4_OFF));
Delay(10);
rGPBDAT = rGPBDAT&(LED3_ON);
Delay(10);
rGPBDAT = rGPBDAT|((LED1_OFF)|(LED2_OFF)|(LED3_OFF)|(LED4_OFF));
Delay(10);
rGPBDAT = rGPBDAT&(LED4_ON);
Delay(10);
rGPBDAT = rGPBDAT|((LED1_OFF)|(LED2_OFF)|(LED3_OFF)|(LED4_OFF));
Delay(10);
}
}
void Led_Port_Init(void)
{
rGPBCON &= ~((3<<10)|(3<<12)|(3<<14)|(3<<16));
rGPBCON |= (1<<10)|(1<<12)|(1<<14)|(1<<16);
}
void Delay(int tt)
{
int a,b;
for(a=0;a<=tt;a++)
for(b=0;b<=10000;b++);
}
完成编辑后进入到关键环节，就是配置界面要选择好。（需说明的是Keil MDK 支持Nor Flash下载和仿真状态，nand flash目前没找到下载方法）
图1 程序配置
目标界面设置如改图1所示，从配置界面可以看出，程序将拷贝至ROM空间，空间大小为2M。芯片上电运行将程序拷贝至RAM地址空间0x30000000处大小为2M开始运行。
图2 烧写驱动选择J-LINK / J-TRACE ARM
图3 配置Jlink的flash烧写函数
如图2、3所示，配置目标芯片的烧写函数，选择应用的nor flash芯片。Use Target Driver勾选，取消Use debug driver和Upadate Target选项勾选。
图3 使目标编译程序产生bin文件
图4 勾选产生HEX File
其他界面如图3、图4所示。
图5 设置Ext_RAM.ini
设置完成后，编译程序，点击Load下载目标程序。下载目标前注意图5Ext_RAM.ini中的设置。函数设置如下：
/******************************************************************************/
/* 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. */
/******************************************************************************/
0x200000
FUNC void Init (void) {
_WDWORD(0x4A000008, 0xFFFFFFFF); // Disable All Interrupts
_WDWORD(0x53000000, 0x00000000); // Disable Watchdog Timer
// Clock Setup
// FCLK = 300 MHz, HCLK = 100 MHz, PCLK = 50 MHz
_WDWORD(0x4C000000, 0x0FFF0FFF); // LOCKTIME
_WDWORD(0x4C000014, 0x0000000F); // CLKDIVN
_WDWORD(0x4C000004, 0x00043011); // MPLLCON
_WDWORD(0x4C000008, 0x00038021); // UPLLCON
_WDWORD(0x4C00000C, 0x001FFFF0); // CLKCON
// Memory Controller Setup for SDRAM
_WDWORD(0x48000000, 0x22000000); // BWSCON
_WDWORD(0x4800001C, 0x00018005); // BANKCON6
_WDWORD(0x48000020, 0x00018005); // BANKCON7
_WDWORD(0x48000024, 0x008404F3); // REFRESH
_WDWORD(0x48000028, 0x00000032); // BANKSIZE
_WDWORD(0x4800002C, 0x00000020); // MRSRB6
_WDWORD(0x48000030, 0x00000020); // MRSRB7
_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
//CPSR = 0x00000063; // 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 obj\led.axf INCREMENTAL // Download program
PC = 0x30000000; // Setup for Running
g, main // Goto Main
注意修改该行代码与当前工程生成文件名一致，LOAD obj\led.axf INCREMENTAL // Download program
原文地址：https://www.cnblogs.com/luxingsh/p/11965082.html