#include "iom16v.h"

//復位腳
#define RST_CLR	PORTC &= ~(1 << PC6)
#define RST_SET	PORTC |= (1 << PC6)
#define RST_IN	DDRC &= ~(1 << PC6)
#define RST_OUT	DDRC |= (1 << PC6)

//雙向數據
#define IO_CLR	PORTC &= ~(1 << PC1)
#define IO_SET	PORTC |= (1 << PC1)
#define IO_R	PINC & (1 << PC1)
#define IO_IN	DDRC &= ~(1 << PC1)
#define IO_OUT	DDRC |= (1 << PC1)

//時鐘信號
#define SCK_CLR	PORTC &= ~(1 << PC0)
#define SCK_SET	PORTC |= (1 << PC0)
#define SCK_IN	DDRC &= ~(1 << PC0)
#define SCK_OUT	DDRC |= (1 << PC0)

#define ds1302_sec_add			0x80		 
#define ds1302_min_add			0x82		 
#define ds1302_hr_add			0x84		 
#define ds1302_date_add			0x86		 
#define ds1302_month_add		0x88		 
#define ds1302_day_add			0x8a		 
#define ds1302_year_add			0x8c		 
#define ds1302_control_add		0x8e		 
#define ds1302_charger_add		0x90 					 
#define ds1302_clkburst_add		0xbe



//向DS1302寫入一字節數據
void ds1302_write_byte(unsigned char addr, unsigned char d) {

	unsigned char i;
	RST_SET;					//啟動DS1302總線
	
	//寫入目標地址：addr
	IO_OUT;
	addr = addr & 0xFE;//最低位置零
	for (i = 0; i < 8; i ++) {
		if (addr & 0x01) {
			IO_SET;
			}
		else {
			IO_CLR;
			}
		SCK_SET;
		SCK_CLR;
		addr = addr >> 1;
		}
	
	//寫入數據
	IO_OUT;
	for (i = 0; i < 8; i ++) {
		if (d & 0x01) {
			IO_SET;
			}
		else {
			IO_CLR;
			}
		SCK_SET;
		SCK_CLR;
		d = d >> 1;
		}
	RST_CLR;					//禁止DS1302總線
}

//讀出一個字節
unsigned char ds1302_read_byte(unsigned char addr) {

	unsigned char i;
	unsigned char temp;
	RST_SET;					//啟動DS1302總線

	//寫入目標地址：addr
	IO_OUT;
	addr = addr | 0x01;         //最低位置高
	for (i = 0; i < 8; i ++) {
		if (addr & 0x01) {
			IO_SET;
			}
		else {
			IO_CLR;
			}
		SCK_SET;
		SCK_CLR;
		addr = addr >> 1;
		}
	
	//輸出數據
	IO_IN;
	for (i = 0; i < 8; i ++) {
		temp = temp >> 1;
		if (IO_R) {
			temp |= 0x80;
			}
		else {
			temp &= 0x7F;
			}
		SCK_SET;
		SCK_CLR;
		}
	
	RST_CLR;					//禁止DS1302總線
	return temp;
}

//寫入時鐘數據
void ds1302_write_time(unsigned char *time_data)
 {

	ds1302_write_byte(ds1302_control_add,0x00);			//關閉寫保護 
	ds1302_write_byte(ds1302_sec_add,0x80);				//暫停 
	time_data++;
	ds1302_write_byte(ds1302_year_add,*time_data++);	//只寫入后面兩位 08
	ds1302_write_byte(ds1302_month_add,*time_data++);	//月 
	ds1302_write_byte(ds1302_date_add,*time_data++);    //日  
	ds1302_write_byte(ds1302_hr_add,*time_data++);		//時 
	ds1302_write_byte(ds1302_min_add,*time_data++);		//分
	ds1302_write_byte(ds1302_sec_add,*time_data++);		//秒
	ds1302_write_byte(ds1302_day_add,*time_data);		//周 
	ds1302_write_byte(ds1302_control_add,0x80);			//打開寫保護 
}

//讀出時鐘數據
void ds1302_read_time(unsigned char *time_data)  { 
    time_data++;
	*time_data=ds1302_read_byte(ds1302_year_add);	    //只讀出后面兩位08
	time_data++;
	*time_data=ds1302_read_byte(ds1302_month_add);	    //月 
	time_data++;
	*time_data=ds1302_read_byte(ds1302_date_add);		//日 
	time_data++;
	*time_data=ds1302_read_byte(ds1302_hr_add);		    //時 
	time_data++;
	*time_data=ds1302_read_byte(ds1302_min_add);	    //分 
	time_data++;
	*time_data=(ds1302_read_byte(ds1302_sec_add))&0x7F; //秒 
	time_data++;
	*time_data=ds1302_read_byte(ds1302_day_add);	    //周 
}

//初始化
void ds1302_init(void) {
	
	RST_CLR;			 
	SCK_CLR;			 
	RST_OUT;			 
	SCK_OUT;			 
}