Miini2440 starts with the simplest led marquee

I just bought a mini2440 board and started to learn it slowly.

Start with the simplest led marquee.

First, view the data manual

 

 

The program is very simple, but it is modified in the routine as follows:

Void dely (u32 TT)
{
U32 I;
For (; tt> 0; TT --)
{
For (I = 0; I <10000; I ++ ){}
}
}

Int main (INT argc, char ** argv)
{
Int I;
U8 key;
U32 mpll_val = 0;
Int data;

Mpll_val = (92 <12) | (1 <4) | (1 );
 
Changempllvalue (mpll_val> 12) & 0xff, (mpll_val> 4) & 0x3f, mpll_val & 3 );
Changeclockdivider (Key, 12 );

Mmu_disableicache ();
Mmu_disabledcache ();

Rgpbcon = 0x155555;

I = 0;
Data = ~ 0x01;
While (1)
{

Rgpbdat = (Data <5 );
Dely (1, 120 );
Data = ~ (0x01 <I );
I ++;
If (I = 4)
I = 0;

}

Return 0;
}

 

The program is very simple, but it is also the first learning program.