cfg._h

通过编程可以是实现对DS1302提供相应的时钟信号

/*******************************
*程序名称：功能函数集
*作    者：萧联珠
*日    期：2007-11-22
********************************/
#include <iom16v.h>

/*复位脚*/
#define RST_CLR	PORTC &= ~(1 << PC4)/*电平置低*/
#define RST_SET	PORTC |= (1 << PC4)/*电平置高*/
#define RST_IN	DDRC &= ~(1 << PC4)/*方向输入*/
#define RST_OUT	DDRC |= (1 << PC4)/*方向输出*/

/*双向数据*/
#define IO_CLR	PORTC &= ~(1 << PC3)/*电平置低*/
#define IO_SET	PORTC |= (1 << PC3)/*电平置高*/
#define IO_R	PINC & (1 << PC3)/*电平读取*/
#define IO_IN	DDRC &= ~(1 << PC3)/*方向输入*/
#define IO_OUT	DDRC |= (1 << PC3)/*方向输出*/

/*时钟信号*/
#define SCK_CLR	PORTC &= ~(1 << PC2)/*时钟信号*/
#define SCK_SET	PORTC |= (1 << PC2)/*电平置高*/
#define SCK_IN	DDRC &= ~(1 << PC2)/*方向输入*/
#define SCK_OUT	DDRC |= (1 << PC2)/*方向输出*/

#define ds1302_sec_add			0x80		//秒数据地址
#define ds1302_min_add			0x82		//分数据地址
#define ds1302_hr_add			0x84		//时数据地址
#define ds1302_date_add			0x86		//日数据地址
#define ds1302_month_add		0x88		//月数据地址
#define ds1302_day_add			0x8a		//星期数据地址
#define ds1302_year_add			0x8c		//年数据地址
#define ds1302_control_add		0x8e		//控制数据地址
#define ds1302_charger_add		0x90 					 
#define ds1302_clkburst_add		0xbe

unsigned char time_buf[8] = {0x20,0x07,0x05,0x08,0x16,0x15,0x00,0x02};

/*延时子程序*/
void delay_ms(int time)
{
 int i;
 for(;time>0;time--)
  for(i=0;i<1000;i++);
}

/*串口初始化*/
void uart_init()
{
 UCSRA=0x02; //异步正常模式
 UCSRB=0x18; //允许发送接受中断和使能
 UCSRC=0x06; //8位数据
 UBRRH=0x00;
 UBRRL=12;   //波特率位9600
}


/*向DS1302写入一字节数据*/
void ds1302_write_byte(unsigned char addr, unsigned char d) {

	unsigned char i;
	RST_SET;					/*启动DS1302总线*/
	
	/*写入目标地址：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;
		}
	
	/*写入数据：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总线*/
}

/*从DS1302读出一字节数据*/
unsigned char ds1302_read_byte(unsigned char addr) {

	unsigned char i;
	unsigned char temp;
	RST_SET;					/*启动DS1302总线*/

	/*写入目标地址：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;
		}
	
	/*输出数据：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总线*/
	return temp;
}

/*向DS302写入时钟数据*/
void ds1302_write_time(void) {

	ds1302_write_byte(ds1302_control_add,0x00);			//关闭写保护 
	ds1302_write_byte(ds1302_sec_add,0x80);				//暂停 
	//ds1302_write_byte(ds1302_charger_add,0xa9);			//涓流充电 
	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]);		//时 
	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);			//打开写保护 
}

/*从DS302读出时钟数据*/
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);		//时 
	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初始化函数*/
void ds1302_init(void) {
	
	RST_CLR;			/*RST脚置低*/
	SCK_CLR;			/*SCK脚置低*/
	RST_OUT;			/*RST脚设置为输出*/
	SCK_OUT;			/*SCK脚设置为输出*/
}