时钟芯片DS1302的驱动程序

  1 ds1302的程序，不是很简洁，占的程序空间有点长
  2 
  3 程序：
  4 
  5 //////////////////////////////////
  6 //根据自己的接线改管脚定义
  7 sbit DS1302_cs=P1^2;
  8 sbit DS1302_data=P1^1;
  9 sbit DS1302_clk=P1^0;
 10 sbit ACC0=ACC^0;
 11 sbit ACC7=ACC^7;
 12 //////////////////////////////////
 13 #define uchar unsigned char
 14 #define uint unsigned int
 15 
 16 uchar year,month,date,hour,minute,second,week;//定义变量
 17 
 18 //////////////////////////////////
 19 //函数声明
 20 oid DS1302_init();//ds1302初始化 
 21 void DS1302_write(unsigned char DS1302_temp);  //写入一个字节  
 22 uchar DS1302_read(void); //读一字节 
 23 void DS1302_write_time(int command,int dat);//写入second or minute or hour...... or 写入一个命令  
 24 uchar DS1302_read_time(int command);//读取second or minute or hour......
 25 void DS1302_readdate();
 26 void DS1302_writedate();
 27 void long_ds1302_delay()  //长延时
 28 void short_ds1302_delay();//短延时
 29 ////////////////////////////////// 
 30 
 31 
 32 void short_ds1302_delay()
 33 {
 34   uchar i;
 35   for(i=0;i<5;i++);
 36 }
 37 
 38 void long_ds1302_delay()
 39 {
 40   uchar i;
 41   for(i=0;i<25;i++);
 42 }
 43 
 44 void DS1302_write(unsigned char DS1302_temp)  //写入一个字节 
 45 {
 46   uchar i,temp;
 47   long_ds1302_delay();
 48   temp=DS1302_temp;
 49   for(i=0;i<8;i++)
 50   {
 51     DS1302_data=temp&0x01;
 52  short_ds1302_delay();
 53  DS1302_clk=1;
 54  short_ds1302_delay();
 55  DS1302_clk=0;
 56  temp=temp>>1;
 57   }
 58 }
 59 
 60 unsigned char DS1302_read(void) //读一字节 
 61 {
 62   uchar i,temp;
 63   long_ds1302_delay();
 64   temp=0;
 65   for(i=0;i<8;i++)
 66   {
 67     temp=temp>>1;
 68  if(DS1302_data==1)
 69    temp=temp+0x80;
 70  DS1302_clk=1;
 71  short_ds1302_delay();
 72  DS1302_clk=0;
 73  short_ds1302_delay();
 74   }
 75   return temp;
 76 }
 77 /*
 78 /////////写操作设置,当a=0x80时禁止写操作,a=0x00时允许////////////////
 79 
 80 void DS1302_write_able(unsigned char a)
 81 {
 82   DS1302_cs=0;
 83 
 84   DS1302_clk=0;
 85   short_ds1302_delay();
 86   DS1302_cs=1;
 87   DS1302_write(0x8e);
 88   DS1302_data=1;
 89   DS1302_write(a);
 90   DS1302_cs=0;
 91   short_ds1302_delay();
 92   DS1302_clk=1;
 93 }
 94 
 95 /////////读操作设置,当a=0x80时禁止读操作,a=0x00时允许////////////////
 96 
 97 void DS1302_read_able(unsigned char a)
 98 {
 99   DS1302_cs=0;
100 
101   DS1302_clk=0;
102   short_ds1302_delay();
103   DS1302_cs=1;
104   DS1302_write(0x8f);
105   DS1302_data=1;
106   DS1302_write(a);
107   DS1302_cs=0;
108   short_ds1302_delay();
109   DS1302_clk=1;
110 }
111 */
112 ////////////////////ds1302初始化////////////////////////
113 void DS1302_init()
114 {
115   uchar i;
116   DS1302_write_time(0x8e,0x00);    //允许写操作
117 
118   DS1302_cs=0;
119 
120   DS1302_clk=0;
121   short_ds1302_delay();
122   DS1302_cs=1;
123   DS1302_write(0x81);
124   DS1302_data=1;
125   i=DS1302_read();
126   DS1302_cs=0;
127   short_ds1302_delay();
128   DS1302_clk=1;
129   second=((i>>4)&0x07)*10+(i&0x0f);
130 
131   DS1302_clk=0;
132   short_ds1302_delay();
133   DS1302_cs=1;
134   DS1302_write(0x80);
135   DS1302_data=1;
136   DS1302_write(0x7f&i);
137   DS1302_cs=0;
138   short_ds1302_delay();
139   DS1302_clk=1; 
140   
141   DS1302_clk=0;    //充电设置
142   short_ds1302_delay();
143   DS1302_cs=1;
144   DS1302_write(0x90);
145   DS1302_data=1;
146 //  DS1302_write(0xa6);    //允许充电,一个二极管 4k电阻
147   DS1302_write(0x00);    //禁止充电
148   DS1302_cs=0;
149   short_ds1302_delay();
150   DS1302_clk=1;  
151    
152   DS1302_write_time(0x8e,0x80);    //禁止写操作
153 }
154 
155 unsigned char DS1302_read_time(int command)//读取second or minute or hour......
156 {
157   uchar i;
158   DS1302_clk=0;
159   short_ds1302_delay();
160   DS1302_cs=1;
161   DS1302_write(command);
162   DS1302_data=1;
163   i=DS1302_read();
164   DS1302_cs=0;
165   short_ds1302_delay();
166   DS1302_clk=1;
167   return i;
168 }
169 void DS1302_readdate()
170 {
171   uchar i;
172   DS1302_cs=0;
173 
174   //读取second
175   i=DS1302_read_time(0x81);
176   second=((i>>4)&0x07)*10+(i&0x0f);
177 
178   //读取分minute
179   i=DS1302_read_time(0x83);
180   minute=((i>>4)&0x07)*10+(i&0x0f);
181 
182   //读取时hour
183   i=DS1302_read_time(0x85);
184   hour=((i>>4)&0x03)*10+(i&0x0f);
185 
186   //读取日date
187   i=DS1302_read_time(0x87);
188   date=((i>>4)&0x03)*10+(i&0x0f);
189 
190   //读取月份month
191   i=DS1302_read_time(0x89);
192   month=((i>>4)&0x01)*10+(i&0x0f);
193 
194   //读取周week
195   i=DS1302_read_time(0x8b);
196   week=i&0x07;
197 
198   //读取年份year
199   i=DS1302_read_time(0x8d);
200   year=((i>>4)&0x0f)*10+(i&0x0f);
201 }
202 
203 
204 void DS1302_write_time(int command,int dat)//写入second or minute or hour...... or 写入一个命令
205 {
206   DS1302_clk=0;
207   short_ds1302_delay();
208   DS1302_cs=1;
209   DS1302_write(command);
210   DS1302_data=1;
211   DS1302_write(dat);
212   DS1302_cs=0;
213   short_ds1302_delay();
214   DS1302_clk=1;
215 }
216 
217 void DS1302_writedate()
218 {
219 
220   DS1302_write_time(0x8e,0x00);    //允许写操作
221   DS1302_cs=0;  
222   DS1302_write_time(0x80,0x7f&(((second/10)<<4)+(second%10)));  //写second
223   DS1302_write_time(0x82,0x7f&(((minute/10)<<4)+(minute%10)));  //minute 
224   DS1302_write_time(0x84,0x3f&(((hour/10)<<4)+(hour%10)));  //hour
225   DS1302_write_time(0x86,0x3f&(((date/10)<<4)+(date%10)));  //date
226   DS1302_write_time(0x88,0x1f&(((month/10)<<4)+(month%10))); //month
227   DS1302_write_time(0x8a,0x07&week); //week
228   DS1302_write_time(0x8c,((year/10)<<4)+(year%10)); //year
229   DS1302_write_time(0x8e,0x80);    //禁止写操作
230 }