运行本例时，按下K1可使直流电机正转，按下K2可使直流电机反转，按下K3时停止。
Proteus运行时截图：
Atmel Studio6.2 编译通过截图：
程序清单：
/*
* GccApplication35.c
*
* Created: 2014-12-16 20:52:59
* Author: Administrator
*/
#define F_CPU 4000000UL
#include <util/delay.h>
#include <avr/io.h>
#include <stdint.h>
#define K1_DOWN()((PIND & _BV(PD1))==0x00)
#define K2_DOWN()((PIND& _BV(PD4))==0x00)
#define K3_DOWN() ((PIND & _BV(PD7))==0x00)
#define LED1_ON() (PORTC = 0B11111110)
#define LED2_ON() (PORTC = 0B11111101)
#define LED3_ON() (PORTC = 0B11111011)
#define MA_0() (PORTB &= ~_BV(PB2))
#define MA_1() (PORTB |= _BV(PB2))
#define MB_0() (PORTB &= ~_BV(PB1))
#define MB_1() (PORTB |= _BV(PB1))
int main(void)
{
DDRB = 0xFF;PORTB = 0xFF;
DDRC = 0xFF;PORTC = 0xFF;
DDRD = 0x00;PORTD = 0xFF;
LED3_ON();
while(1)
{
if(K1_DOWN())
{
while(K1_DOWN());
LED1_ON();MA_0();MB_1();
}
if(K2_DOWN())
{
while(K2_DOWN());
LED2_ON(); MA_1();MB_0();
}
if(K3_DOWN())
{
while(K3_DOWN())
LED3_ON();MA_0();MB_0();
}
}
}
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