ATmega128 IO 学习

#include

void Delay(unsigned int T)
{
unsigned int i,j;
for (i=0;ifor (j=0;j<100;j++)
asmvolatile("nop"); //汇编指令，让单片机运行空指令
}

void main()
{
DDRA=0XFF;
//DDRA=0B11111111;//定义PA端口全为输出

DDRE = 0x04;
PORTE= 0X04;//开发板控制LED时需要PE2使能端置1
while (1)
{
PORTA=0X00;
Delay(1000);
PORTA=0XFF;
Delay(1000);
}

}


流水灯（IO 作输入口使用）

#include

void delay(unsigned int t)
{
unsigned int i,j;

for (i=1;ifor (j=1;j<10;j++)
asmvolatile("nop");
}

int main()
{

DDRE=0X04;
PORTE=0X04;

DDRA=0XFF;
delay(100);
PORTA=0XFF;
delay(100);

DDRD=0X00;

while(1)
{
unsigned char a;
a=PIND;

delay(1000);
if (0xff-a==0b10010001)
{
delay(100);
PORTA=0X00;
delay(100);
}
if (0xff-a==0b10010010)
{
delay(100);
PORTA=0XFF;
delay(100);
}
}

return 0;
}