6410裸板程序，led、蜂鸣器、按键…

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

//作者：昊天

//

//功能：在ok6410板子上跑裸板程序，用四个按键控制四个led灯的两灭及蜂鸣器的叫声，

//    
 当按键1按下时（此时为低电平）点亮led1同时蜂鸣器响，当松手时，led1灭及蜂鸣器不响
   

//    
 以此类推剩下三个键

//时间：2012/12/13   22:01

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

//蜂鸣器---GPF15

#define GPFCON   (*(volatile unsigned
*)(0x7f0080a0))

#define GPFDAT   (*(volatile unsigned
*)(0x7f0080a4))

#define GPFPUD   (*(volatile unsigned
*)(0x7f0080a8))

//按键（6个）---GPN0--GPN5

#define GPNCON   (*(volatile unsigned
*)(0x7f008830))

#define GPNDAT   (*(volatile unsigned
*)(0x7f008834))

#define GPNPUD   (*(volatile unsigned
*)(0x7f008838))

//LED（四个）----GPM0--GPM3

#define GPMCON  (*(volatile unsigned long
*)(0x7F008820))

#define GPMDAT  (*(volatile unsigned long
*)(0x7F008824))

#define GPMPUD   (*(volatile unsigned long
*)(0x7F008828))

void msDelay(volatile unsigned int time)

{

volatile unsigned int i;

volatile unsigned int j;

for(i=0;i<200000;i++)

{

for(j=0;j

}

}

 void GPIO_Init(void)

 {  //初始化buzzer

GPFCON = GPFCON &
(~(0x1<<(31)));  
//最高位31至0

GPFCON = GPFCON | (0x1<<(2*15));
     //第30位置1
  这样01表示输出

GPFPUD = GPFPUD &
(~(0x3<<(2*15)));  
//上拉电阻禁用

GPFDAT = GPFDAT & 0x7fff;  
//第16管脚输出为0  也就是buzzer不响

 

//初始化按键

GPNCON = GPNCON &
(0xffffffff<<12);

  GPNPUD = GPNPUD &
(0xffffffff<<12);

  GPNDAT = GPNDAT |
(~(0xffffffff<<6));

 

  //led初始化

    GPMCON = GPMCON |
(0x00001111);

    GPMPUD = GPMPUD
&
(0xFFFFFFFF<<8);

    GPMDAT = GPMDAT |
(~(0xfffffff0));

    

    

 }

 void BeepOff(void)

{

GPFDAT = GPFDAT &0x7fff;

}

void BeepOn(void)

{

GPFDAT = GPFDAT | 0x8000;

}

unsigned int KeyScan(void)

{

  

    if((GPNDAT
& 0x3f)==0x3e)

  return 1;  //说明按键1按下

else if((GPNDAT & 0x3f)==0x3d)

  return 2;  
//说明有按键2按下

else if((GPNDAT & 0x3f)==0x3b)

  return 3;  
  //说明有按键3按下

else if((GPNDAT & 0x3f)==0x37)

  return 4;  
   //说明有按键4按下

else

  return 0;  
 //说明没有按键按下

  

}

void KeyTest(void)

{

   unsigned int
KeyStatus;

   while(1)

   {

   
KeyStatus=KeyScan();

     

    switch(KeyStatus)

    {

    case
0:BeepOff(); 

     
    GPMDAT = GPMDAT |
0x0000000f;

     
    break;

    case 1:GPMDAT = (GPMDAT
& 0xfffffffe);   //1键按下点亮led1
     
     
  

     
     
  BeepOn();    
     
     
     
   

     
    break;

    case 2:GPMDAT = GPMDAT
& 0xfffffffd;

     
     
  BeepOn();

     
     
  break;

    case 3:GPMDAT = GPMDAT
& 0xfffffffb;

     
     
  BeepOn();

     
     
  break;

     
 case 4:GPMDAT = GPMDAT &
0xfffffff7;

     
     
  BeepOn();

     
     
  break;

    }

     

     

   }

}

void main(void)

{

GPIO_Init();

    BeepOff();

    KeyTest();

    

}

下面是启动代码init.o：

PRESERVE8

IMPORT main

AREA init,CODE,READONLY

ENTRY

CODE32

START

ldr r0,=0x70000000

orr r0,r0,#0x13

mcr p15,0,r0,c15,c2,4

ldr r0,=0x7E004000

mov r1,#0

str r1,[r0]

ldr sp,=8*1024

bl main

     
      END