初识AVR单片机(基本程序及PROTEUS仿真).doc

1.跑马灯

#include<iom16v.h>
/*延时函数*/
voidDelay()
{
unsignedchara,b;
for(a=1;a;a++)
for(b=1;b;b++);
}
voidmain()
{
inti;
DDRB=0xFF;/*定义B口输出*/
while(1)
{
PORTB=0x01;/*点亮一个LED灯*/
Delay();
for(i=0;i<7;i++)
{
PORTB<<=1;/*被点亮的LED灯移位*/
Delay();
}
}
}
PROTEUS仿真图：

2.方波产生

//ICC-AVRapplicationbuilder:2011-7-1820:05:48
//Target:M16
//Crystal:7.3728Mhz

#include<iom16v.h>
#include<macros.h>

voidmain(void)
{
PORTA=0x00;
DDRA=0xFF; //初始化A口
while(1)
{
PORTA=0XFF; //A口置高电平
DELAY(50); //高电平延时
PORTA=0X00; //A口置低电平
DELAY(50); //低电平延时
}
}
//延时函数
void DELAY(unsigned inti)
{
unsignedint a,b;
for(b=0;b<i;b++)
for(a=0;a;a++);
}

PROTEUS仿真图：

3.外部按键中断

//ICC-AVRapplicationbuilder:2011-7-9PM03:34:01
//Target:M16
//Crystal:7.3728Mhz

#include<iom16v.h>
#include<macros.h>

voidport_init(void)
{
PORTB=0xFF;
DDRB=0xFF;
PORTD=0xFF;
DDRD=0x00;
}

#pragmainterrupt_handlerint0_isr:2
voidint0_isr(void)
{
PORTB=~PORTB;
//externalinteruptonINT0
}

//callthisroutinetoinitializeallperipherals
voidinit_devices(void)
{
//stoperrantinterruptsuntilsetup
CLI();//disableallinterrupts
port_init();

MCUCR=0x0A;
GICR=0x40;
TIMSK=0x00;//timerinterruptsources
SEI();//re-enableinterrupts
//allperipheralsarenowinitialized
}
voidmain(void)
{
init_devices();
while(1)
{}
}
PROTEUS仿真图：

4.定时器中断

//ICC-AVRapplicationbuilder:2011-7-10AM10:41:53
//Target:M16
//Crystal:7.3728Mhz

#include<iom16v.h>
#include<macros.h>
unsignedinti=0;
voidport_init(void)
{
PORTB=0x01;
DDRB=0xFF;
}

//TIMER0initialize-prescale:1024
//WGM:Normal
//desiredvalue:10mSec
//actualvalue:10.000mSec(0.0%)
voidtimer0_init(void)
{
TCCR0=0x00;//stop
TCNT0=0xB8;//setcount
OCR0=0x48;//setcompare
TCCR0=0x05;//starttimer
}

#pragmainterrupt_handlertimer0_ovf_isr:10
voidtimer0_ovf_isr(void)
{
i++;
if(i==100)
{PORTB<<=1;
i=0;
if(PORTB==0X00)
{PORTB=0X01;}}
TCNT0=0xB8;//reloadcountervalue
}

//callthisroutinetoinitializeallperipherals
voidinit_devices(void)
{
//stoperrantinterruptsuntilsetup
CLI();//disableallinterrupts
port