//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);


#define w1       PORTD =  0x01;
#define w2       PORTD =  0x02;
#define w3       PORTD =  0x04;
#define w4       PORTD =  0x08;
#define w5       PORTD =  0x10;
#define w6       PORTD =  0x20;
#define w7       PORTD =  0x40;
#define w8       PORTD =  0x80;


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;

int count = 1;
int count_num = 1;
int btn2_count = 1;
int btn2_3_count = 0;

void btn2_1(void)
{
    S_OFF;
    for(i = 0;i<500;i++)
    {
    PORTD = seg[0];S_1;
    delay_ms(1);
    PORTD = seg[7];S_2;
    delay_ms(1);
    PORTD = seg[2];S_3;
    delay_ms(1);
    PORTD = seg[4];S_4;
    delay_ms(1);
    }
    S_OFF;
    btn2_count += 1;
}

void btn2_2(void)
{
    S_OFF;
    for(i = 0;i<500;i++)
    {
    PORTD = seg[0];S_1;
    delay_ms(1);
    PORTD = seg[2];S_2;
    delay_ms(1);
    PORTD = seg[5];S_3;
    delay_ms(1);
    PORTD = seg[6];S_4;
    delay_ms(1);
    }
    S_OFF;
    btn2_count += 1;
}

void btn2_3(void)
{
    S_OFF;
    th = btn2_3_count / 1000;
    PORTD = seg[th];
    S_1;
    delay_us(900);
    S_OFF;
    hu = (btn2_3_count / 100) % 10;
    PORTD = seg[hu];
    S_2;
    delay_us(900);
    S_OFF;
    ten = (btn2_3_count / 10) % 10;
    PORTD = seg[ten]|0x80;
    S_3;
    delay_us(900);
    S_OFF;
    num = btn2_3_count % 10;
    PORTD = seg[num];
    S_4;
    delay_us(900);
}

void btn1_fuc(void)
{

     switch(count_num)
    {
        case 1 : S_1;break;
        case 2 : S_2;break;
        case 3 : S_3;break;
        case 4 : S_4;break;
    }

}

void btn1(void)
{
    switch(count)
    {
        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;
    }
    btn1_fuc();

}

void key_scan(void)
{
    if((PINB&0x3F)!=0x3F)
    {
        if((PINB&0x3F)!=0x3F)
        {
            delay_ms(20);
            switch(PINB)
            {
                case 0X3E:
                    timer0_open();
                break;//S1

                case 0X3B:
                    switch(btn2_count)
                    {
                     case 1:btn2_1();break;
                     case 2:btn2_2();break;
                     case 3:
                        delay_ms(1000);
                    timer0_close();
                        timer2_open();
                        btn2_count =1;
                        break;
                    }
                break;//S2

                case 0X37:
                    timer2_open();
                break;//S6
                default:break;
            }
            delay_ms(1);
        }
    }
}

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();
}

void timer2_close(void)
{
    CLI();
TCCR2 = 0X03;//0000 0011
     TCNT2 = 0X83;//初值
    SEI();
}

void timer2_open(void)
{
    CLI();
TCCR2 = 0X03;//0000 0011
     TCNT2 = 0X83;//初值

    SEI();
}

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

 TIMSK = 0x43;
 TCCR0 =(0<<CS01) | (0<<CS00);
 TCNT0 = 0X05;

TCCR2 = 0X00;//0000 0011
     TCNT2 = 0X83;//初值

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

    if(data == 50)              // 50*(255-5)*(8M/64)=0.1s
    {
    if(count == 9)
        {
        count = 1;
        count_num += 1;
        }
        if(count_num == 5)
    {
        count_num = 1;
    }
        data = 0;
        S_OFF;
        btn1();
        count = count + 1;

    }
}

#pragma interrupt_handler timer2_ovf_isf:5
void timer2_ovf_isf(void)
{
  TCNT2 = 0X83;//初值
  data++;

    if(data = 50)               // 50*(255-5)*(8M/64)=0.1s
    {
        data = 0;
        btn2_3_count += 1;

        btn2_3();
        S_OFF;
    }
}

void main(void)
{
SREG = 0X80;
   init_devices();
   while(1)
   {
        key_scan();
   }
}