ATmega8_p3

//ICC-AVR application builder
//atmega8_p3
/*
    功能：
        預設在七段顯示器顯示ADC7可變電阻值
        按鈕按第一下：七段顯示器從ADC7值跑到0
        按鈕按第二下：七段顯示器從0跑到ADC7值，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);

unsigned char tab[16] =
{
    0x3f,0x06,0x5b,0x4f,
    0x66,0x6d,0x7d,0x07,
    0x7f,0x6f,0x77,0x7c,
    0x39,0x5e,0x79,0x71
};

//初始化 變量 聲明//////////////////////////////////////////////////////////////
unsigned char cnn = 0;//定時器變量
unsigned char i   = 0;//數碼管位選用
unsigned int  j   = 0;
unsigned char ad  = 0;//AD採集間隔
unsigned int ad_data2=0;
int count = 0;
int flag  = 0;
int th  = 0;
int hu  = 0;
int ten = 0;
int num = 0;

void de_led(void)
{
    S_OFF;
    th = ad_data2 / 1000;
    PORTD = tab[th];
    S_1;
    delay_ms(1);

    S_OFF;
    hu = (ad_data2 / 100) % 10;
    PORTD = tab[hu]|0x80;
    S_2;
    delay_ms(1);

    S_OFF;
    ten = (ad_data2 / 10) % 10;
    PORTD = tab[ten];
    S_3;
    delay_ms(1);

    S_OFF;
    num = ad_data2 % 10;
    PORTD = tab[num];
    S_4;
    delay_ms(1);
}
void btn1(void)
{
    flag = ad_chane(ad_cat());
    for(j = flag;j>0;j--)
    {
        S_OFF;
        th = j / 1000;
        PORTD = tab[th];
        S_1;
        delay_ms(2);

        S_OFF;
        hu = (j / 100) % 10;
        PORTD = tab[hu]|0x80;
        S_2;
        delay_ms(2);

        S_OFF;
        ten = (j / 10) % 10;
        PORTD = tab[ten];
        S_3;
        delay_ms(2);

        S_OFF;
        num = j % 10;
        PORTD = tab[num];
        S_4;
        delay_ms(1);
    }
}

void btn2(void)
{
    flag = ad_chane(ad_cat());
    for(j = 0;j<flag;j++)
    {
        S_OFF;
        th = j / 1000;
        PORTD = tab[th];
        S_1;
        delay_ms(2);
        S_OFF;
        hu = (j / 100) % 10;
        PORTD = tab[hu]|0x80;
        S_2;
        delay_ms(2);
        S_OFF;
        ten = (j / 10) % 10;
        PORTD = tab[ten];
        S_3;
        delay_ms(2);
        S_OFF;
        num = j % 10;
        PORTD = tab[num];
        S_4;
        delay_ms(1);
    }
}

void key_scan(void)
{
    delay_ms(20);
    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
        }
    }
}
/*******************************************************************************
* 函數名稱: delay_us()
* 入口參數: microsecond : 輸入延時微秒的時間
* 出口參數:
* 功能描述: 微秒的延時
*******************************************************************************/
void delay_us(unsigned int microsecond)
{
    do
    {
        microsecond--;
    }
    while (microsecond>1);
}
/*******************************************************************************
* 函數名稱: delay_ms()
* 入口參數: millisecond : 輸入延時毫秒的時間
* 出口參數:
* 功能描述: 毫秒的延時
*******************************************************************************/
void delay_ms(unsigned int millisecond)
{
    while (millisecond--)
    {
        delay_us(999);
    }
}

//I、O口初始化
void por_init(void)
{
   DDRB  = 0XC0;//1100 0000
   PORTB = 0XFF;
   PORTD = 0XFF;
   DDRD = 0XFF;
   PORTC = 0X0F;//AD採集口 ADC 設置為輸入
   DDRC = 0X0F;

}

void display(unsigned char n)
{
    PORTD = tab[n];
}

void display1(unsigned char n)
{
    PORTD = tab[n]|0X80;
}

//定時器0初始化
void timer0_int(void)
{
    TCCR0 =(1<<CS01) | (1<<CS00);
    TCNT0 = 0X05;
    TIMSK = 0x01; //T0/C0溢出中斷使能
}

//CPU總體初始化
void init_devices(void)
{
   por_init();
   timer0_int();
   SEI();
}

unsigned int ad_cat(void)//電壓採集函數
{
    unsigned int t1,t2;
    ADCSRA = 0X00;//disable adc
    ADMUX=0x07;//ref  左對齊  ADC7
    ACSR = 0x80;//使能adc可用，不用修改
    ADCSRA|=BIT(ADEN);
    ADCSRA|=BIT(ADSC);
    while(!(ADCSRA&(BIT(ADIF))));
    ADCSRA&=~BIT(ADIF);
    t1 = (unsigned int)ADCL;
    t2 = (unsigned int)ADCH;
    t2 = (t2<<8)+t1;
    return t2;
}

unsigned int ad_chane(unsigned int i)//電壓轉換函數
{
   long x;
   unsigned int y;
   x = (2500*(long)i)/1024;
   y = (unsigned int)x;
   return y;
}

//定時器0///////////////////////////////////////////////////////////////////////
#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
   ad++;
   if(50==ad)//AD採集
   {
        ad=0;
        ad_data2=ad_chane(ad_cat());
   }
}//end of void timer0_ovf_isr(void)

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