按鍵實現led

實驗目的：按鍵控制led燈

實驗環境： mini2440

工具： ads1.2 h-jtag1.0

如下start.s

 area init,code,readonly

start ldr

sp,=4096

import main

bl main

end

//main.c

#include "def.h"

int dely(unsigned int a)
{
  while(a--);
   return 0;        
}


int main()

{

 rGPBCON|=0x15400;
 rGPGCON|=0x80A882;
 
 
 while(1)
 {
   if((rGPGDAT&0x1)==0x0)
       LED1_ON;
  
   if((rGPGDAT&0x8)==0x0)
       LED2_ON;
   if((rGPGDAT&0x20)==0x0)
       LED3_ON;
   if((rGPGDAT&0x40)==0x0)
       LED4_ON;
   if((rGPGDAT&0x1)==0x1)
       LED1_OFF;
   if((rGPGDAT&0x8)==0x8)
       LED2_OFF;
   if((rGPGDAT&0x20)==0x20)
       LED3_OFF;
   if((rGPGDAT&0x40)==0x40)
       LED4_OFF;
 
 }

 return 0;
}

 

//def.h

#ifndef __DEF_H
#define __DEF_H

#define rGPBCON ((*(volatile unsigned *)0x56000010))
#define rGPBDAT ((*(volatile unsigned *)0x56000014))

#define rGPGCON  ((*(volatile unsigned *)0x56000060))
#define rGPGDAT  ((*(volatile unsigned *)0x56000064))

#define LED1_ON rGPBDAT &=(~(1<<5))
#define LED2_ON rGPBDAT &=(~(1<<6))
#define LED3_ON rGPBDAT &=(~(1<<7))
#define LED4_ON rGPBDAT &=(~(1<<8))

#define LED1_OFF rGPBDAT |=(1<<5)
#define LED2_OFF rGPBDAT |=(1<<6)
#define LED3_OFF rGPBDAT |=(1<<7)
#define LED4_OFF rGPBDAT |=(1<<8)
#endif