#define DELAY 1000000
void init_port();
void LED_EXERCISE_1();
void LED_EXERCISE_2();
void LED_EXERCISE_3();
void LED_EXERCISE_4();
void LED_EXERCISE_5();
void LED_EXERCISE_6();
void LED_EXERCISE_7();
void LED_EXERCISE_8();
void LED_EXERCISE_9();
void LED_EXERCISE_10();
void LED_EXERCISE_11();
void LED_EXERCISE_12();

void setup() 
{
  init_port();
  LED_EXERCISE_1(); 
  //LED_EXERCISE_2(); 
  //LED_EXERCISE_3(); 
  //LED_EXERCISE_4(); 
  //LED_EXERCISE_5(); 
  //LED_EXERCISE_6(); 
  //LED_EXERCISE_7(); 
  //LED_EXERCISE_8(); 
  //LED_EXERCISE_9(); 
  //LED_EXERCISE_10(); 
  }

void init_port()
{
  volatile char *direction_f;
  direction_f = 0x30;
  *direction_f = 0xFF;
}

void delay_for()
{
  volatile unsigned long i;
  for(i=0;i<DELAY;i++);
}

void writef(int x)
{
  volatile char *out_f;
  out_f = 0x31;
  *out_f = x;
}
//------------------------------------------------------------------------------------------
void  LED_EXERCISE_1() /**/
{
  while(1)
  {
  unsigned char a = 0x88,i; //1000 1000
  for(i=0;i<4;i++)
  {
    writef(a>>i);
    delay_for();
  }
  }
}
//------------------------------------------------------------------------------------------
void LED_EXERCISE_2() 
{
  while(1)
  {
  char a = 0x11,i; //00010001; 00100010; 01000100;
  for(i=0;i<4;i++)
  {
    writef(a<<i);
    delay_for();
  }
  }
}
//------------------------------------------------------------------------------------------
void LED_EXERCISE_3()  /**/
{
  while(1)
  {
  unsigned char a = 0x80,i; //00010001; 00100010; 01000100;
  for(i=0;i<8;i++)
  {
    writef(a>>i);
    delay_for();
  }
  a = 0x01;
  for(i=0;i<8;i++)
  {
    writef(a<<i);
    delay_for();
  }
  }
}
//------------------------------------------------------------------------------------------
void LED_EXERCISE_4()  
{           // 7654 3210; 
  // 01; 04; 02; 08; 10; 40; 20; 80;
  writef(1); delay_for();
  writef(4); delay_for();
  writef(2); delay_for();
  writef(8); delay_for();
  writef(16); delay_for();
  writef(64); delay_for();
  writef(32); delay_for();
  writef(128); delay_for();
}
//------------------------------------------------------------------------------------------
void LED_EXERCISE_5()
{
  while(1)
  {
  writef(0x03); delay_for();
  writef(0xc0); delay_for();
  writef(0x0c); delay_for();
  writef(0x30); delay_for();
  }
}
//------------------------------------------------------------------------------------------
void LED_EXERCISE_6() 
{
 while(1)
  {
  writef(0x30); delay_for();
  writef(0x0c); delay_for();
  writef(0xc0); delay_for();
  writef(0x03); delay_for();
  }
}
//------------------------------------------------------------------------------------------
void LED_EXERCISE_7() 
{
 while(1)
  {
  writef(0x07); delay_for();
  writef(0xe0); delay_for();
  writef(0x18); delay_for();
  }
}
//------------------------------------------------------------------------------------------
void LED_EXERCISE_8() 
{
  while(1)
  {
  writef(0x18); delay_for();
  writef(0xe0); delay_for();
  writef(0x07); delay_for();
  }
}
//------------------------------------------------------------------------------------------
void LED_EXERCISE_9() 
{
  char a=0x01,i;
  while(1){
  writef(0x01); delay_for();
  
  for(i=0;i<8;i++)
  {
    a = ((a<<1)+1);
    writef(a);
    delay_for();
  }
}
}
//------------------------------------------------------------------------------------------
void LED_EXERCISE_10() /**/
{
   unsigned char a=0x80,i;
   while(1)
   {
  writef(a); delay_for();
  for(i=0;i<8;i++)
  {
    a = ((a>>1)+0x80);
    writef(a);
    delay_for();
  }
}
}
//------------------------------------------------------------------------------------------


void loop()
{

}