//#include <iom16v.h>
//復位腳
#define RST_CLR PORTE&=~(1<<PE4) 
#define RST_SET PORTE|=(1<<PE4)
#define RST_IN  DDRE&=~(1<<PE4)
#define RST_OUT DDRE|=(1<<PE4)
//雙向數據

#define IO_CLR PORTE&=~(1<<PE3)
#define IO_SET PORTE|=(1<<PE3)
#define IO_R   PINE&(1<<PE3)
#define IO_IN  DDRE&=~(1<<PE3)
#define IO_OUT DDRE|=(1<<PE3)
//時鐘信號
#define SCK_CLR PORTE&=~(1<<PE2)
#define SCK_SET PORTE|=(1<<PE2)
#define SCK_IN  DDRE&=~(1<<PE2)
#define SCK_OUT DDRE|=(1<<PE2)
#define ds1302_sec_add			0x80		//秒數據地址
#define ds1302_min_add			0x82		//分數據地址
#define ds1302_hr_add			0x84		//時數據地址
#define ds1302_date_add			0x86		//日數據地址
#define ds1302_month_add		0x88		//月數據地址
#define ds1302_day_add			0x8a		//星期數據地址
#define ds1302_year_add			0x8c		//年數據地址
#define ds1302_control_add		0x8e		//控制數據地址
#define ds1302_charger_add		0x90 					 
#define ds1302_clkburst_add		0xbe
unsigned char time_buf[8] = {0x20,0x08,0x03,0x21,0x20,0x20,0x00,0x02};
/*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：d*/
	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;					/*停止DS1302總線*/
}

/*從DS1302讀出一字節數據*/
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：temp*/
	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;					/*停止DS1302總線*/
	return temp;
}

/*向DS302寫入時鐘數據*/
void ds1302_write_time(void) {

	ds1302_write_byte(ds1302_control_add,0x00);			//關閉寫保護 
	ds1302_write_byte(ds1302_sec_add,0x80);				//暫停 
	//ds1302_write_byte(ds1302_charger_add,0xa9);			//涓流充電 
	ds1302_write_byte(ds1302_year_add,time_buf[1]);		//年 
	ds1302_write_byte(ds1302_month_add,time_buf[2]);	//月 
	ds1302_write_byte(ds1302_date_add,time_buf[3]);		//日 
	ds1302_write_byte(ds1302_day_add,time_buf[7]);		//周 
	ds1302_write_byte(ds1302_hr_add,time_buf[4]);		//時 
	ds1302_write_byte(ds1302_min_add,time_buf[5]);		//分
	ds1302_write_byte(ds1302_sec_add,time_buf[6]);		//秒
	ds1302_write_byte(ds1302_day_add,time_buf[7]);		//周 
	ds1302_write_byte(ds1302_control_add,0x80);			//打開寫保護 
}

/*從DS302讀出時鐘數據*/
void ds1302_read_time(void)  { 

	time_buf[1]=ds1302_read_byte(ds1302_year_add);		//年 
	time_buf[2]=ds1302_read_byte(ds1302_month_add);		//月 
	time_buf[3]=ds1302_read_byte(ds1302_date_add);		//日 
	time_buf[4]=ds1302_read_byte(ds1302_hr_add);		//時 
	time_buf[5]=ds1302_read_byte(ds1302_min_add);		//分 
	time_buf[6]=(ds1302_read_byte(ds1302_sec_add))&0x7F;//秒 
	time_buf[7]=ds1302_read_byte(ds1302_day_add);		//周 
}

/*DS302初始化函數*/
void ds1302_init(void) {
	
	RST_CLR;			/*RST腳置低*/
	SCK_CLR;			/*SCK腳置低*/
	RST_OUT;			/*RST腳設置為輸出*/
	SCK_OUT;			/*SCK腳設置為輸出*/
}