AVR 单片机 实例,ATMEGA128,atmega128 , LED灯实验

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///////////////////我使用的是 AVR studio 加 WinAVR环境////////

#include

#include

#define delay_us(x) _delay_us(x)

#define delay_ms(x) _delay_ms(x)

#define u8 unsigned char

#define u16 unsigned int

#define mode 2 /////// 这个地方写2 就执行下面的2，写1就执行1，

void main(void)

{

DDRA = 0x00;

PORTA = 0xff;

DDRB = 0xff;

PORTB = 0xff;

if(mode == 1) ///只是单纯的闪，8个LED灯一亮一灭

{

while(1)

{

delay_ms(1000);

PORTB ^= 0xff; // PORTB异或ff，PORTB与FF发生异或，得

// PORTB=0，再次异或得1，循环

}

}

if(mode == 2)

{

while(1)

{

u16 i,j=0x01;

for(i=0;i<7;i++)

{

PORTB = j;

delay_ms(1000);

j<<=1;

}

j=0x80;

for(i=0;i<7;i++)

{

PORTB = j;

delay_ms(1000);

j>>=1;

}

}

}

if(mode == 3)//单个LED灯左移

{

u8 led = 0xfe;

while(1)

{

PORTB = led;

delay_ms(1000);

led=(led <<=1) | 0x01;

if(led==0xff)

led = 0xfe;

}

}

if(mode == 4)//单个LED灯右移 {

u8 led = 0x7f;

u16 k = 64;

while(k!=0)

{

PORTB = led;

delay_ms(1000);

led = (led >>=1)|0x80;

k --;

if(led == 0xff)

led = 0x7f;

}

}

if(mode == 5)//两个个LED灯左移

{

u8 led = 0xfc;

u16 k = 64;

while(k!=0)

{

PORTB = led;

delay_ms(1000);

led <<=1;

led |=0x01;

k --;

if(led == 0x7f)

led = 0xfc;

}

}

if(mode == 6) //两个LED 一会左移，一会右移 {

u8 led=0b11111100;

while(1)

{

while(led !=0b00111111)

{

PORTB = led;

delay_ms(1000);

led <<= 2;

led |= 0b00000011;

}

while(led != 0b11111100)

{

PORTB = led;

delay_ms(1000);

led >>= 2;

led |= 0b11000000;

}

}

}

}