2440 Bare Metal Program - Marquee

Four programs need to be added to the project: S3C2440A.s; 2440lib.c; main.c; led.c.

Main program:

/*********************************************************************************************

* File name： main.c

* Author: ZXL 

* Description: 1. Marquee 2. LED lights display 1-15 in binary format

* History: 2013.5.5

*********************************************************************************************/

#include "def.h"

#include "option.h"

#include "2440addr.h"     

#include "2440lib.h"

void dely(U32 tt)

{

   U32 i;

   for(;tt>0;tt--)

        for(i=0;i<10000;i++);

}

void init()

{

U32 i;

U8 key;

U32 mpll_val=0;

    i = 2 ; 

switch ( i ) //Set the clock frequency of 2440

{

case 0:  //200

key = 12;

mpll_val = (92<<12)|(4<<4)|(1);

break;

case 1:  //300

key = 13;

mpll_val = (67<<12)|(1<<4)|(1);

break;

case 2:  //400

key = 14;

mpll_val = (92<<12)|(1<<4)|(1);

break;

case 3:  //440!!!

key = 14;

mpll_val = (102<<12)|(1<<4)|(1);

break;

default:

key = 14;

mpll_val = (92<<12)|(1<<4)|(1);

break;

}

//MDIV=92,PDIV=1,SDIV=1 Determined by configuring MPLLCON, MPLL, that is, FCLK=400MHZ

ChangeMPllValue((mpll_val>>12)&0xff, (mpll_val>>4)&0x3f, mpll_val&3);

ChangeClockDivider(key, 12);  //FCLK:HCLK:PCLK = 1：1/4：1/8 =400M:100M:50M

Port_Init();

Uart_Init(0,115200);

    Uart_Select(0);   

Uart_Printf("nLED Test Begin!n");

}  

int main(int argc, char **argv)

{

heat();

led_port_init(); 

    while(1)

    {     

      led();

    }        

}  

LED Program:

/*********************************************************************************************

* File name： led.c

* Author: ZXL 

* Description: 1. Marquee 2. Press numbers 1-15 to light up the LED lights incrementally

* History: 2013.5.5

*********************************************************************************************/

#include "def.h"

#include "2440lib.h"  

#include "2440addr.h" 

#define LED1_ON   ~(1<<5)

#define LED2_ON   ~(1<<6)

#define LED3_ON   ~(1<<7)

#define LED4_ON   ~(1<<8)

#define LED1_OFF   (1<<5)

#define LED2_OFF   (1<<6)

#define LED3_OFF   (1<<7)

#define LED4_OFF   (1<<8)

void led_port_init()

{

rGPBCON &= ~((3<<10)|(3<<12)|(3<<14)|(3<<16)); //Control register clear

    rGPBCON |= (1<<10)|(1<<12)|(1<<14)|(1<<16); //Control register is set to output

rGPBDAT |= (LED1_OFF)|(LED2_OFF)|(LED3_OFF)|(LED4_OFF); //All LED lights are off

}

void disp_num(int data)

{

  if(data & 0x01)   rGPBDAT &= (LED1_ON);

     else           rGPBDAT |= (LED1_OFF);

  if(data & 0x02)   rGPBDAT &= (LED2_ON);

     else           rGPBDAT |= (LED2_OFF);

  if(data & 0x04)   rGPBDAT &= (LED3_ON);

     else           rGPBDAT |= (LED3_OFF);

  if(data & 0x08)   rGPBDAT &= (LED4_ON);

     else           rGPBDAT |= (LED4_OFF);     

}

void led() //LED lights display 1-15 in binary mode

{

  U32 i;

for(i=0;i<16;i++)

{

 disp_num(i);

 daily(100);

}

}

/*

void led()

{

//Marquee program

while (1)

{ 

rGPBDAT &= (LED1_ON);

daily(100);

rGPBDAT |= (LED1_OFF)|(LED2_OFF)|(LED3_OFF)|(LED4_OFF);

daily(100);

rGPBDAT &= (LED2_ON);

daily(100);

rGPBDAT |= (LED1_OFF)|(LED2_OFF)|(LED3_OFF)|(LED4_OFF);

daily(100);

rGPBDAT &= (LED3_ON);

daily(100);

rGPBDAT |= (LED1_OFF)|(LED2_OFF)|(LED3_OFF)|(LED4_OFF);

daily(100);

rGPBDAT &= (LED4_ON);

daily(100);

rGPBDAT |= (LED1_OFF)|(LED2_OFF)|(LED3_OFF)|(LED4_OFF);

daily(100);

}    

}

*/