ATmega8_p4

//ICC-AVR application builder
//atmega8_p4
/*
    功能：計時器
        S1按鈕：設定時間(從0000向上數，放開即停)
        S2按鈕：開始倒數(timer開啟)
        S4按鈕：暫停倒數(timer關閉)
        S6按鈕：控制倒數速度(從0000向上數，放開即停，數值可從0~100)
        倒數至0000時閃爍三下
*/

#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);


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 th = 0;
int hu = 0;
int ten = 0;
int num = 0;
int i = 0;
int speed = 50;
int again = 0;

void key_scan(void)
{
    if((PINB&0x3F)!=0x3F)     //假如1~8顆按鈕有被按下去(=0)
    {
        if((PINB&0x3F)!=0x3F)
        {
            delay_ms(20);
            switch(PINB)
            {
                case 0X3E:
                    while((PINB) == 0X3E)
                        {
                            flag = flag + 1;
                            up_count();

                            if(flag == 9999)
                            {
                                flag = 0;
                            }
                            delay_ms(10);
                        }
                break;//S1

                case 0X3B:
                    timer0_open();
                break;//S2

                case 0X37:
                    while((PINB) == 0X37)
                    {
                        speed = speed + 1;
                        speed_count();

                        if(speed == 100)
                        {
                            speed = 0;
                        }
                        delay_ms(20);
                    }
                break;//S6

                case 0X3D:
                    timer0_close();
                break;//S4

                default:break;
            }
            delay_ms(1);
        }
    }
}

void stop_fuc(void)
{
    if(again == 1)
    {
        timer0_close();
        for(i = 0;i<3;i++)
        {
            S_OFF;
            delay_ms(500);
            S_ON;
            delay_ms(500);
        }
        again = 0;
        flag = 0;
    }
}

void speed_count(void)
{
    for(i = 0;i<40;i++)
    {
        S_OFF;
        th = speed / 1000;
        PORTD = seg[th];
        S_1;
        delay_us(500);
        S_OFF;
        hu = (speed / 100) % 10;
        PORTD = seg[hu];
        S_2;
        delay_us(500);
        S_OFF;
        ten = (speed / 10) % 10;
        PORTD = seg[ten];
        S_3;
        delay_us(500);
        S_OFF;
        num = speed % 10;
        PORTD = seg[num];
        S_4;
        delay_us(500);
    }
}

void up_count(void)
{
    S_OFF;
    th = flag / 1000;
    PORTD = seg[th];
    S_1;
    delay_us(900);
    S_OFF;
    hu = (flag / 100) % 10;
    PORTD = seg[hu];
    S_2;
    delay_us(900);
    S_OFF;
    ten = (flag / 10) % 10;
    PORTD = seg[ten]|0x80;
    S_3;
    delay_us(900);
    S_OFF;
    num = flag % 10;
    PORTD = seg[num];
    S_4;
    delay_us(900);
}

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;
 PORTB = 0XFF;//按鈕

 PORTC = 0xFF;
 DDRC  = 0xFF;
 PORTD = 0xFF;
 DDRD  = 0xFF;//七段顯示器
}

void timer0_close(void)
{
    CLI();
    TIMSK = 0x01;
    TCCR0 =(0<<CS01) | (0<<CS00);
    TCNT0 = 0X05;//0XFF   256    (0xFF-0X05) *8M/64
    SEI();
}

void timer0_open(void)
{
    CLI();
    TIMSK = 0x01;
    TCCR0 =(1<<CS01) | (1<<CS00);
    TCNT0 = 0X05;                   //timer起始值(255-5)
    SEI();
}

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

 TIMSK = 0x01;
 TCCR0 =(0<<CS01) | (0<<CS00);
 TCNT0 = 0X05;

 SEI();
}
//向量值
#pragma interrupt_handler timer0_ovf_isr:10
void timer0_ovf_isr(void)
{
    TCNT0 = 0X05;
    data++;

    if(data == speed && again == 0)             // 50*(255-5)*(8M/64)=0.1s
    {
        data = 0;
        flag -= 1;
        if(flag == 0)
        {
            again = 1;
        }
        up_count();
        S_OFF;
    }
}


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