学单片机要不要学汇编？这个还是很有必要的。

#define rGPMCON (*(volatile unsigned *)(0x7f008820))
#define rGPMDAT (*(volatile unsigned *)(0x7f008824))
#define rGPMPUD (*(volatile unsigned *)(0x7f008828))
void msDelay(int time)
{
volatile unsigned int i,j;
for(i=0;i<2000000;i++)
for(j=0;j<time;j++);
}
void GPIO_lnit()
{
rGPMCON=1111;
rGPMPUD=0X00;
rGPMDAT=0x1f;
}
void ledTest(void)
{
volatile unsigned i;
while(1)
{
for(i=0;i<4;i++)
{
rGPMDAT=~(1<<i);
msDelay(10);
}
}
}
void Main()
{
GPIO_lnit();
ledTest();
}
这是为OK6410写的led程序（网上抄来的），下面是启动文件代码（startup.s），谁给改下让它能跑起来。
;/*************************************************************************************
;
;Project Name : S3C6410 Validation
;
;Copyright 2006 by Samsung Electronics, Inc.
;All rights reserved.
;
;Project Description :
;This software is only for validating functions of the S3C6410.
;Anybody can use this software without our permission.
;
;--------------------------------------------------------------------------------------
;
;File Name : startup.s
;
;File Description : This file implements the startup procedure.
;
;Author: Heemyung.Noh
;Dept. : AP Development Team
;Created Date : 2008/02/20
;Version : 0.1
;
;History
;- Created for Scatterloading&TCM option(Heemyung.Noh 2008/02/20)
;
;*************************************************************************************/
GEToption.inc
;=======================================================
;ENTRY
;=======================================================
AREA Init,CODE,READONLY
ENTRY
ResetHandler
LDR R13, =top_of_stacks
EXPORT__main
__main
;; initialise the C library (which calls main())
IMPORT__rt_entry
LDRR0, =__rt_entry
BX R0
b.
;=======================================================
END

以前以为单片机会自动识别main函数，现在才知道单片机要认识这个函数必须要在启动代码指定。