ARM Learning Note II LED lighting program

The first step, first talk about the single-chip microcomputer LED lit:Single chip microcomputer can operate single bit: Sbit    led1    =P1    ^2;    Control the light and extinguish by controlling variable led1;

  
 

   
  

  
#include <reg52.h>
   
  

  

   
  

  
sbit led1 = P1 ^ 2;
   
  

  

   
  

  
void delay(unsigned int xx)//延时
   
  

  
{
   
  

  
 int i = 0;
   
  

  
 while(xx--)
   
  

  
 {
   
  

  
 for(i = 0; i < 400; i++);
   
  

  
 }
   
  

  
}
   
  

  

   
  

  
int main()
   
  

  
{
   
  

  
 while(1)
   
  

  
 {
   
  

  
 led1 = 1//灭
   
  

  
 delay(100);
   
  

  
 led1 = 0;//亮
   
  

  
 delay(100);
   
  

  
 }
   
  

  
}
  
 

This is a single-chip computer lighting experiment, we will introduce it to ARM:
ARM can not be like single-chip microcomputer to do a single bit operation, it must be whole, but also very simple ...
     there are so many steps:(1) Analysis Circuit (need to operate which lamp, this is what you want to do)
(2) Analysis drive mode (query register working mode: input/output/...) )
(3) control of the corresponding PIN (query which pin and whether the pin is pulled high or low)

No, just on the code .

  
 

   
  

  
#include <S3C2440.h>
   
  

  

   
  

  
#define LED_A_ON(i) GPADAT &= ~(0x1 << i) //A口i灯亮
   
  

  
 #define   led_b_on   ( i    Gpbdat  &=    ~ ( 0x1    <<   i  )    //b port I Light up   
   
  

  
 #define   Led_a_off  Span class= "pun" > ( i    Gpadat  Span class= "pun" >|=     ( 0x1    <<   i  )    //a port I Light up   
   
  

  
#define LED_B_OFF(i) GPBDAT |= (0x1 << i) //B口i灯亮
   
  

  

   
  

  
void LED_INIT(void);//初始化控制灯
   
  

  
void delay(unsigned int xx);//延时
   
  

  

   
  

  

   
  

  
int main()
   
  

  
{
   
  

  
 LED_INIT();
   
  

  
 while(1)//流水灯实验
   
  

  
 {
   
  

  
 LED_B_ON(5);
   
  

  
    LED_B_OFF(6);
   
  

  
    LED_A_OFF(25);
   
  

  
    LED_A_OFF(26);
   
  

  

   
  

  
    delay(100);
   
  

  

   
  

  
    LED_B_ON(6);
   
  

  
    LED_B_OFF(5);
   
  

  
    LED_A_OFF(25);
   
  

  
    LED_A_OFF(26);
   
  

  

   
  

  
    delay(100);
   
  

  

   
  

  
    LED_A_ON(25);
   
  

  
    LED_B_OFF(5);
   
  

  
    LED_B_OFF(6);
   
  

  
    LED_A_OFF(26);
   
  

  

   
  

  
    delay(100);
   
  

  

   
  

  
    LED_A_ON(26);
   
  

  
    LED_B_OFF(5);
   
  

  
    LED_B_OFF(6);
   
  

  
    LED_A_OFF(25);
   
  

  
    delay(100);
   
  

  
 }
   
  

  
}
   
  

  

   
  

  
void LED_INIT()//初始化控制灯
   
  

  
{
   
  

  
GPBCON &= ~(0x03 << 10);//GPB5清零
   
  

  
 GPBCON |= (0x01 << 10); //置1
   
  

  
GPACON &= ~(0x3 << 25); 
   
  

  
GPADAT |= (0x3 << 25);
   
  

  
 GPBDAT |= (0x3 << 5);
   
  

  
delay(10000);
   
  

  
}
  
 

compare yourself, isn't it too difficult?


From for notes (Wiz)

ARM Learning Note II LED lighting program