/*********************************************
File name			: demo_6_5.c
Chip type           : ATmega16
Program type        : Application
Clock frequency     : 4.000000 MHz
Memory model        : Small
External SRAM size  : 0
Data Stack size     : 256
*********************************************/

#include <mega16.h>
	#ifndef __SLEEP_DEFINED__
	#define __SLEEP_DEFINED__
	.EQU __se_bit=0x40
	.EQU __sm_mask=0xB0
	.EQU __sm_powerdown=0x20
	.EQU __sm_powersave=0x30
	.EQU __sm_standby=0xA0
	.EQU __sm_ext_standby=0xB0
	.EQU __sm_adc_noise_red=0x10
	.SET power_ctrl_reg=mcucr
	#endif
#include <delay.h>

flash unsigned char led_7[10]={0xC0,0xF9,0xA4,0xB0,0x99,0x92,0x82,0xF8,0x80,0x90};
flash unsigned char position[4]={0x80,0x40,0x20,0x10};
unsigned char time[3];					// 時、分、秒計數
unsigned char dis_buff[4];				// 顯示緩沖區，存放要顯示的4個字符的段碼值
unsigned char time_counter;				// 1秒計數器
bit point_on;					// 秒顯示標志

void display(void)				// 掃描顯示函數，執行時間12ms
{
	unsigned char i;
 	for(i=0;i<=3;i++)
	{
		PORTC = led_7[dis_buff[i]];
		if (point_on && ( i==2)) PORTC &= 0x7F;
		PORTD= position[i];
       	        delay_ms(3);
       	        PORTD = 0x00;
  	}
}

void time_to_disbuffer(void)			// 時間值送顯示緩沖區函數
{
	unsigned char i,j=0;
	for (i=1;i<=2;i++)
	{
		dis_buff[j++] = time[i] % 10;
		dis_buff[j++] = time[i] / 10;
	}
}

void main(void)
{
    PORTD=0x00;		// PORTB初始化
    DDRD=0XF0;
    PORTC=0xFF;		// PORTC初始化
    DDRC=0xFF;

    time[2] = 23; time[1] = 58; time[0] = 55;	// 時間初值23:58:55
    time_to_disbuffer();

    while (1)
    {
	    display();						// 顯示掃描，執行時間12ms
	    if (++time_counter >= 40)
	    {
		    time_counter = 0;
		    point_on = ~point_on;
		    if (++time[0] >= 60)
		    {
			    time[0] = 0;
			    if (++time[1] >= 60)
			    {
				    time[1] = 0;
				    if (++time[2] >= 24) time[2] = 0;
			    }
		    }
		    time_to_disbuffer();
	    }
        delay_ms(13);					// 延時13ms，可進行其它處理
    }
}