ATmega8_p2

//ICC-AVR application builder
//atmega8_p2
/*
    功能：
        預設跑七段顯示器迴圈
        按鈕按第一下：七段顯示器從0000跑到9999
        按鈕按第二下：七段顯示器從9999跑到6666，同時記錄回到第一下
*/

#include<iom8v.h>
#include<macros.h>

#define S_1      PORTC &= ~BIT(0);PORTC|=BIT(1) ;PORTC|=BIT(2) ;PORTC|=BIT(3);
#define S_2      PORTC |= BIT(0) ;PORTC&=~BIT(1);PORTC|=BIT(2) ;PORTC|=BIT(3);
#define S_3      PORTC |= BIT(0) ;PORTC|=BIT(1) ;PORTC&=~BIT(2);PORTC|=BIT(3);
#define S_4      PORTC |= BIT(0) ;PORTC|=BIT(1) ;PORTC|=BIT(2) ;PORTC&=~BIT(3);
#define S_OFF    PORTC |= BIT(0) ;PORTC|=BIT(1) ;PORTC|=BIT(2) ;PORTC|=BIT(3);
#define S_ON     PORTC &= ~BIT(0);PORTC&=~BIT(1);PORTC&=~BIT(2);PORTC&=~BIT(3);

#define w1       PORTD =  0x01; S_1;
#define w2       PORTD =  0x01; S_2;
#define w3       PORTD =  0x01; S_3;
#define w4       PORTD =  0x01; S_4;
#define w5       PORTD =  0x02; S_4;
#define w6       PORTD =  0x04; S_4;
#define w7       PORTD =  0x08; S_4;
#define w8       PORTD =  0x08; S_3;
#define w9       PORTD =  0x08; S_2;
#define w10      PORTD =  0x08; S_1;
#define w11      PORTD =  0x10; S_1;
#define w12      PORTD =  0x20; S_1;

unsigned int seg[10] =
{
    0x3f,0x06,0x5b,0x4f,
    0x66,0x6d,0x7d,0x07,
    0x7f,0x6f
};

//初始化 變量 聲明//////////////////////////////////////////////////////////////
int data = 0;
int flag = 0;
int count = 0;
int th = 0;
int hu = 0;
int ten = 0;
int num = 0;
int i = 0;

void key_scan(void)
{
    if((PINB&0x3F)!=0x3F)     //假如1~8顆按鈕有被按下去(=0)
    {
        delay_ms(20);
        if((PINB&0X3B) == 0X3B)//0X3B = S2按鈕
        {
            delay_ms(20);
            if(count == 0)
            {
                btn1();
                count = count + 1;
                delay_ms(100);
            }
            else if(count == 1)
            {
                btn2();
                count = 0;
                delay_ms(100);
            }
            //LED = 1 會等於 LED = 0XF1，LED = 2 會等於 LED = 0XF2，以此類推
        }
    }
}
void btn1(void)
{
    for(i = 0;i<10000;i++)
    {
        S_OFF;
        th = i / 1000;
        PORTD = seg[th];
        S_1;

        S_OFF;
        hu = (i / 100) % 10;
        PORTD = seg[hu];
        S_2;

        S_OFF;
        ten = (i / 10) % 10;
        PORTD = seg[ten];
        S_3;

        S_OFF;
        num = i % 10;
        PORTD = seg[num];
        S_4;
    }
}

void btn2(void)
{
     for(i = 9999;i>6665;i--)
     {
        S_OFF;
        th = i / 1000;
        PORTD = seg[th];
        S_1;

        S_OFF;
        hu = (i / 100) % 10;
        PORTD = seg[hu];
        S_2;

        S_OFF;
        ten = (i / 10) % 10;
        PORTD = seg[ten];
        S_3;

        S_OFF;
        num = i % 10;
        PORTD = seg[num];
        S_4;
    }
}

void w(void)
{
    switch(flag)
    {
        case 1 : w1;break;
        case 2 : w2;break;
        case 3 : w3;break;
        case 4 : w4;break;
        case 5 : w5;break;
        case 6 : w6;break;
        case 7 : w7;break;
        case 8 : w8;break;
        case 9 : w9;break;
        case 10:w10;break;
        case 11:w11;break;
        case 12:w12;break;
    }
}

void delay_us(unsigned int microsecond)
{
    do
    {
        microsecond--;
    }
    while (microsecond>1);
}

void delay_ms(unsigned int millisecond)
{
    while (millisecond--)
    {
        delay_us(999);
    }
}

//I、O口初始化
void port_init(void)
{
 DDRB  = 0XC0;//1100 0000
 PORTB = 0XFF;
 PORTC = 0xFF; //m103 output only
 DDRC  = 0xFF;
 PORTD = 0xFF;
 DDRD  = 0xFF;
}

//定時器0初始化
void timer0_int(void)
{
    TIMSK = 0x01; //T0/C0溢出中斷使能
    TCCR0 =(1<<CS01) | (1<<CS00);
    TCNT0 = 0X05;//0XFF   256    (0xFF-0X05) *8M/64

}
//CPU總體初始化
void init_devices(void)
{
 CLI();
 port_init();
 MCUCR = 0x00;
 GICR  = 0x00;
 TIMSK = 0x00;
 timer0_int();
 SEI();
}

#pragma interrupt_handler timer0_ovf_isr:10
void timer0_ovf_isr(void)
{
    TCNT0 = 0X05;//內部晶振，幾分頻算出時間初值
    data++;
    if(500 == data)// 500*(255-5)*(8M/64)=T
    {
        data = 0;
        S_OFF;
        w();
        flag = flag + 1;
        if(flag == 13)flag = 1;
    }
}//end of void timer0_ovf_isr(void)


void main(void)
{
   init_devices();
   S_OFF;
   while(1)
   {
        key_scan();
   }
}