AVR第7课：动态数码管

动态数码管。

/*

*author:ChenLu

*date:2014.11.20

*/

//input the head file so that the program can work normally

//iom16v---know the register

//macros---know the BIT(x)

#include

#include

//use those can make your study very conveninet

#define uint unsigned int

#define uchar unsigned char

//display methods 

void initSystem();

void delay();

//display the variable data

uchar flag;

uchar table[10] = {0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07};

//the main function

void main()

{

  //init your system

initSystem();

while(1)

{

  //start your function,and this is core solution

for(flag=0;flag<8;flag++)

{

    PORTC = ~(PORTC | BIT(0));

    PORTA = table[flag]; 

    PORTB = ~BIT(flag);

    PORTC = PORTC | BIT(0);

    delay();

}

}

}

//the method of init system

void initSystem()

{

  //control PA

DDRA = 0xFF;

PORTA = table[0];

//to make PB port output 

DDRB = 0xFF;

//to make PB port output high level

PORTB = 0xFE;

//control PC0

DDRC = DDRC | BIT(0);

PORTC = PORTC | BIT(0);

}

//the sub method of delay

void delay()

{

  uint i,j;

  for(i=0;i<10;i++)

  for(j=0;j<5;j++);

}

不断改变delay()函数中变量的值，会出现不一样的效果。主要是熟悉AVR单片机IO口的使用。