ds1302.h

16个单片机c语言实验程序

#include "iom16v.h"

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

//双向数据
#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)

//时钟信号
#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   RES为1时才可进行读写操作
	
	//写入目标地址：addr
	IO_OUT;
	addr = addr & 0xFE;//最低位置零 写操作
	for (i = 0; i < 8; i ++) {
		if (addr & 0x01) {
			IO_SET;
			}
		else {
			IO_CLR;
			}
		SCK_SET;   //上升沿将数据写入
		SCK_CLR;
		addr = addr >> 1;
		}
	
	//写入数据
	IO_OUT;
	for (i = 0; i < 8; i ++) {
		if (d & 0x01) {
			IO_SET;
			}
		else {
			IO_CLR;
			}
		SCK_SET;     //上升沿将数据写入
		SCK_CLR;
		d = d >> 1;
		}
	RST_CLR;					//禁止DS1302总线
}

//读出一个字节
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   读操作
	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
	IO_IN;
	for (i = 0; i < 8; i ++) {                 //由低位向高位读数据
		temp = temp >> 1;
		if (IO_R) {                             //判断是否为1
			temp |= 0x80;
			}
		else {
			temp &= 0x7F;
			}
		SCK_SET;
		SCK_CLR;
		}
	
	RST_CLR;					//禁止DS1302总线
	return temp;
}

//写入时钟数据
void ds1302_write_time(unsigned char *time_data)
 {

	ds1302_write_byte(ds1302_control_add,0x00);			//关闭写保护   此时可以写入数据
	ds1302_write_byte(ds1302_sec_add,0x80);				//暂停    时钟震荡停止
	time_data++;    //指针指向年的后两位
	//送入数据
	ds1302_write_byte(ds1302_year_add,*time_data++);	//年份只写入后面两位
	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++);		//时 
	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);			//打开写保护   拒绝写入数据
}

//读出时钟数据
void ds1302_read_time(unsigned char *time_data)  { 
    time_data++;
	*time_data=ds1302_read_byte(ds1302_year_add);	    //只读出后面两位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);		    //时 
	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;	   //RST为低电平		 
	SCK_CLR;	   //时钟信号为低电平	 
	RST_OUT;       //RST 为输出		 
	SCK_OUT;	// SCK为输出		 
}