area start,code,readonly

reset
    ldr sp,=4096
    import main
    bl main
    end
    
  

#ifndef _DEF_
  #define _DEF_

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

  #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

#include"def.h"
int delay(unsigned int a)
{
    while(a--);
    return 0;
}
int main(int argc,char *argv[])
{    
    rGPBCON |=0x15400;
    while(1)
    {
      
       LED1_ON;
       delay(100000);
       LED2_ON;
       delay(100000);
       LED3_ON;
       delay(100000);
       LED4_ON;
       delay(100000);
       LED1_OFF;
       delay(100000);
       LED2_OFF;
       delay(100000);
       LED3_OFF;
       delay(100000);
       LED4_OFF;
       delay(100000);
    }
    return 0;
}