单片机设计流水灯,该怎么解决

单片机设计流水灯
刚刚学习单片机，老师留得作业使用ATmega16设计流水灯，A B C D 四口从低位向高位依次点亮，然后从高位向低位依次熄灭。如果只用一个口 PORTA 我会，但是不知道怎样写四个的

------解决方案--------------------
给你下代码吧,

C/C++ code

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

void port_init(void)
{
 PORTA = 0x00;
 DDRA  = 0x00;
 PORTB = 0x00;
 DDRB  = 0x02;
 PORTC = 0x00; //m103 output only
 DDRC  = 0x00;
 PORTD = 0x00;
 DDRD  = 0x00;
}

//call this routine to initialize all peripherals
void init_devices(void)
{
 //stop errant interrupts until set up
 CLI(); //disable all interrupts
 port_init();

 MCUCR = 0x00;
 GICR  = 0x00;
 TIMSK = 0x00; //timer interrupt sources
 SEI(); //re-enable interrupts
 //all peripherals are now initialized
}

------解决方案--------------------
具体主函数楼主参考我的代码自己修改下吧：

C/C++ code


#include <iom16v.h>
#define uchar unsigned char 
#define uint  unsigned int
void delay(uint ticks);
void main()
{
 init_devices();
 while(1)
 {
  PORTB^=0x02;//把IO口取反
  delay(5000);
 }
}

void delay(uint ticks)
{
 uchar i;
 while(ticks--)for(i=100;i!=0;i--);//约0.1mS
}

单片机设计流水灯,该怎么解决

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