放假三天,拿出GD32E231的开发板,开始项目的设计。今天与大伙来分享一下DS1302实时时钟模块的资料,本来实现一个时钟的功能,用GD32E231的RTC库函数能够实现,而且GD32E231开发板也提供电池接口,但是我们采用DS1302模块来获得时钟会比较简易,其官方提供的代码容易移植,低功耗,实现永不掉电。 - /*******************说明:**************************
- 将实时时钟数据通过LCD1602显示
- --------------------------------------------------
- 基于战神单片机工作室51/AVR最小系统板及DS1302
- 实时时钟模块编写
- **************************************************/
- #include <reg52.h>
- #include <intrins.h>
- #define uchar unsigned char
- #define uint unsigned int
- uchar dis_time_buf[16]={0};
- //LCD1602引脚定义
- //采用8位并行方式,DB0~DB7连接至LCDDATA0~LCDDATA7
- sbit RS=P2^0;
- sbit RW=P2^1;
- sbit CS=P2^2;
- #define LCDDATA P0
- //DS1302引脚定义
- sbit RST=P1^3;
- sbit IO=P1^2;
- sbit SCK=P1^1;
- //DS1302地址定义
- #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
- //初始时间定义
- uchar time_buf[8] = {0x20,0x10,0x06,0x01,0x23,0x59,0x55,0x02};//初始时间2010年6月1号23点59分55秒 星期二
- //功能:延时1毫秒
- //入口参数:x
- //出口参数:无
- //说明:当晶振为12M时,j<112;当晶振为11.0592M时,j<122
- void Delay_xms(uint x)
- {
- uint i,j;
- for(i=0;i<x;i++)
- for(j=0;j<112;j++);
- }
- //功能:12us延时
- //STC89C52为1T单片机,即1个时钟/机器周期,速度为AT89C52的12倍
- void Delay_xus(uint t)
- {
- for(;t>0;t--)
- {
- _nop_();
- }
- }
- //控制LCD写时序
- void LCD_en_write(void)
- {
- CS=1;
- Delay_xus(20);
- CS=0;
- Delay_xus(20);
- }
- //写指令函数
- void Write_Instruction(uchar command)
- {
- RS=0;
- RW=0;
- CS=1;
- LCDDATA=command;
- LCD_en_write();//写入指令数据
- }
- //写数据函数
- void Write_Data(uchar Wdata)
- {
- RS=1;
- RW=0;
- CS=1;
- LCDDATA=Wdata;
- LCD_en_write();//写入数据
- }
- //字符显示初始地址设置
- void LCD_SET_XY(uchar X,uchar Y)
- {
- uchar address;
- if(Y==0)
- address=0x80+X;//Y=0,表示在第一行显示,地址基数为0x80
- else
- address=0xc0+X;//Y非0时,表时在第二行显示,地址基数为0xC0
- Write_Instruction(address);//写指令,设置显示初始地址
- }
- //在第X行Y列开始显示Wdata所对应的单个字符
- void LCD_write_char(uchar X,uchar Y,uchar Wdata)
- {
- LCD_SET_XY(X,Y);//写地址
- Write_Data(Wdata);//写入当前字符并显示
- }
- //清屏函数
- void LCD_clear(void)
- {
- Write_Instruction(0x01);
- Delay_xms(5);
- }
- //显示屏初始化函数
- void LCD_init(void)
- {
- Write_Instruction(0x38); //8bit interface,2line,5*7dots
- Delay_xms(5);
- Write_Instruction(0x38);
- Delay_xms(5);
- Write_Instruction(0x38);
- Write_Instruction(0x08); //关显示,不显光标,光标不闪烁
- Write_Instruction(0x01); //清屏
- Delay_xms(5);
-
- Write_Instruction(0x04); //写一字符,整屏显示不移动
- //Write_Instruction(0x05); //写一字符,整屏右移
- //Write_Instruction(0x06); //写一字符,整屏显示不移动
- //Write_Instruction(0x07); //写一字符,整屏左移
- Delay_xms(5);
-
- //Write_Instruction(0x0B); //关闭显示(不显示字符,只有背光亮)
- Write_Instruction(0x0C); //开显示,光标、闪烁都关闭
- //Write_Instruction(0x0D); //开显示,不显示光标,但光标闪烁
- //Write_Instruction(0x0E); //开显示,显示光标,但光标不闪烁
- //Write_Instruction(0x0F); //开显示,光标、闪烁均显示
- }
- //DS1302初始化函数
- void ds1302_init(void)
- {
- RST=0; //RST脚置低
- SCK=0; //SCK脚置低
- }
- //向DS1302写入一字节数据
- void ds1302_write_byte(uchar addr, uchar d)
- {
- uchar i;
- RST=1; //启动DS1302总线
- //写入目标地址:addr
- addr = addr & 0xFE; //最低位置零,寄存器0位为0时写,为1时读
- for (i = 0; i < 8; i ++) {
- if (addr & 0x01) {
- IO=1;
- }
- else {
- IO=0;
- }
- SCK=1; //产生时钟
- SCK=0;
- addr = addr >> 1;
- }
- //写入数据:d
- for (i = 0; i < 8; i ++) {
- if (d & 0x01) {
- IO=1;
- }
- else {
- IO=0;
- }
- SCK=1; //产生时钟
- SCK=0;
- d = d >> 1;
- }
- RST=0; //停止DS1302总线
- }
- //从DS1302读出一字节数据
- uchar ds1302_read_byte(uchar addr) {
- uchar i,temp;
- RST=1; //启动DS1302总线
- //写入目标地址:addr
- addr = addr | 0x01; //最低位置高,寄存器0位为0时写,为1时读
- for (i = 0; i < 8; i ++) {
- if (addr & 0x01) {
- IO=1;
- }
- else {
- IO=0;
- }
- SCK=1;
- SCK=0;
- addr = addr >> 1;
- }
- //输出数据:temp
- for (i = 0; i < 8; i ++) {
- temp = temp >> 1;
- if (IO) {
- temp |= 0x80;
- }
- else {
- temp &= 0x7F;
- }
- SCK=1;
- SCK=0;
- }
- RST=0; //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); //暂停时钟
- //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_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,屏蔽秒的第7位,避免超出59
- time_buf[7]=ds1302_read_byte(ds1302_day_add); //周
- }
- void Display(void)
- {
- LCD_write_char(3,0,dis_time_buf[0]+'0');
- LCD_write_char(4,0,dis_time_buf[1]+'0');
- LCD_write_char(5,0,dis_time_buf[2]+'0');
- LCD_write_char(6,0,dis_time_buf[3]+'0');
- LCD_write_char(7,0,'/');
- LCD_write_char(8,0,dis_time_buf[4]+'0');
- LCD_write_char(9,0,dis_time_buf[5]+'0');
- LCD_write_char(10,0,'/');
- LCD_write_char(11,0,dis_time_buf[6]+'0');
- LCD_write_char(12,0,dis_time_buf[7]+'0');
- LCD_write_char(15,0,dis_time_buf[14]+'0');
- //第2行显示
- LCD_write_char(3,1,dis_time_buf[8]+'0');
- LCD_write_char(4,1,dis_time_buf[9]+'0');
- LCD_write_char(5,1,':');
- LCD_write_char(6,1,dis_time_buf[10]+'0');
- LCD_write_char(7,1,dis_time_buf[11]+'0');
- LCD_write_char(8,1,':');
- LCD_write_char(9,1,dis_time_buf[12]+'0');
- LCD_write_char(10,1,dis_time_buf[13]+'0');
- }
- //定时器中断函数
- void Timer2() interrupt 5 //定时器2是5号中断
- {
- static uchar t;
- TF2=0;
- t++;
- if(t==4) //间隔200ms(50ms*4)读取一次时间
- {
- t=0;
- ds1302_read_time(); //读取时间
- dis_time_buf[0]=(time_buf[0]>>4); //年
- dis_time_buf[1]=(time_buf[0]&0x0f);
- dis_time_buf[2]=(time_buf[1]>>4);
- dis_time_buf[3]=(time_buf[1]&0x0f);
- dis_time_buf[4]=(time_buf[2]>>4); //月
- dis_time_buf[5]=(time_buf[2]&0x0f);
- dis_time_buf[6]=(time_buf[3]>>4); //日
- dis_time_buf[7]=(time_buf[3]&0x0f);
- dis_time_buf[14]=(time_buf[7]&0x07); //星期
- //第2行显示
- dis_time_buf[8]=(time_buf[4]>>4); //时
- dis_time_buf[9]=(time_buf[4]&0x0f);
- dis_time_buf[10]=(time_buf[5]>>4); //分
- dis_time_buf[11]=(time_buf[5]&0x0f);
- dis_time_buf[12]=(time_buf[6]>>4); //秒
- dis_time_buf[13]=(time_buf[6]&0x0f);
- }
- }
- //定时器2初始化
- void Init_timer2(void)
- {
- RCAP2H=0x3c;//赋T2初始值0x3cb0,溢出20次为1秒,每次溢出时间为50ms
- RCAP2L=0xb0;
- TR2=1; //启动定时器2
- ET2=1; //打开定时器2中断
- EA=1; //打开总中断
- }
- //主函数
- void main(void)
- {
- Delay_xms(50);//等待系统稳定
- LCD_init(); //LCD初始化
- LCD_clear(); //清屏
- ds1302_init(); //DS1302初始化
- Delay_xms(10);
- ds1302_write_time(); //写入初始值
- Init_timer2(); //定时器2初始化
- while(1)
- {
- Display();
- }
- }
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