led.c

WINAVR编写的LED流水灯程序

/*
 *  流水灯程序
 *  EasyAVR-M16 开发板例程
 *  CopyRights@EES  
 *
 *  实现LED  流水显示
 *
*/


/*
 * File Name:led.c
 * CopyRights @ EES
 * 
 * Author:Einsn Liu
 * 
 * Date:2007-5-24
*/


#include <inttypes.h>
#include <util/delay.h>   //调用winavr提供的延时程序
#include <avr/io.h>
#include <stdio.h>

/*
 *  Hardware define 
 *
*/

#define LED0 PA1
#define LED1 PA2
#define LED2 PA3
#define LED3 PA4

#define LED4 PD0
#define LED5 PD1

#define LED6 PC0
#define LED7 PC1

#define LEDON(i)  do{\
if(i<4)PORTA&=~(1<<(i+1));\
else if(i<6)PORTD&=~(1<<(i-4));\
else if(i<8)PORTC&=~(1<<(i-6));\
}while(0)
//由于PA是1~4,i从0开始算,所以当i<4时要+1,才可以得到需要的1~4的数值,来控制PA口;同理PD,PC

#define LEDOFF(i)  do{\
if(i<4)PORTA|=(1<<(i+1));\
else if(i<6)PORTD|=(1<<(i-4));\
else if(i<8)PORTC|=(1<<(i-6));\
}while(0)

#define LEDPORTINIT()  do{\
DDRA|=(1<<PA1)|(1<<PA2)|(1<<PA3)|(1<<PA4);\
DDRD|=(1<<PD0)|(1<<PD1);\
DDRC|=(1<<PC0)|(1<<PC1);\
}while(0)
//PA1~4;PD0,1;PC0,1为输出，低电平点亮LED，高电平熄灭

//End  Hardware define 


/*
 *  Function: LEDOutput()
 *  IN:val : bitx is the value of the ledx  such as: bit0 = led0 :when  1:led on ;0 led off 
 *  OUT: None
 *  Author:Einsn 
 *  Date:2007-04-21
 *  Others:
*/

void LEDOutput(uint8_t  val)
{
  uint8_t  i;
  for(i=0;i<8;i++)
  {
    if(val&0x01)
	  {
	  LEDON(i);
	  }
	else 
	{
	  LEDOFF(i);
	}
	val>>=1;
  }
}

/*
 *  Function: delay_s()
 *  IN:ss delay times in second
 *  OUT: None
 *  Author:Einsn 
 *  Date:2007-04-21
 *  Others:use the WinAVR  API  _delay_ms
*/

void delay_s(uint8_t ss)
{
  uint8_t i,t;
  for(i=0;i<ss;i++)
  {
    t=100;
		while(--t>0)
		{
	  _delay_ms(10);
		}
  }
}

/*
 *  Function: main()
 *  IN:None
 *  OUT: None
 *  Author:Einsn 
 *  Date:2007-04-21
 *  Others:
*/

int main(void)
{
  uint8_t i,led;
  uint8_t  val[8]={0x01,0x03,0x07,0x0f,0x1f,0x3f,0x7f,0xff};

  LEDPORTINIT();

  while(1)
  {
    for(i=0;i<8;i++)
    {
			led=val[i];
			do
			{
				LEDOutput(led);
				delay_s(1);
				led<<=1;
			}
			while(!(led&0x80));
			
			if(i==7)break;
			LEDOutput(led);
			delay_s(1);
			
			while(!(led&0x01))
			{
				led>>=1;
				LEDOutput(led);
				delay_s(1);
			};
		}
	}
}