IIC RTC DS1307模块Arduino源程序

Arduino源程序如下:

1. extern "C" {
   
2. #include <../Wire/Wire.h>
   
3. }
   
4. #include "DS1307.h"
   
5. 
   
6. DS1307::DS1307()
   
7. {
   
8.   Wire.begin();
   
9. }
   
10. 
    
11. DS1307 RTC=DS1307();
    
12. 
    
13. // PRIVATE FUNCTIONS
    
14. 
    
15. // Aquire data from the RTC chip in BCD format
    
16. // refresh the buffer
    
17. void DS1307::read(void)
    
18. {
    
19.   // use the Wire lib to connect to tho rtc
    
20.   // reset the resgiter pointer to zero
    
21.   Wire.beginTransmission(DS1307_CTRL_ID);
    
22.     Wire.send(0x00);
    
23.   Wire.endTransmission();
    
24. 
    
25.   // request the 7 bytes of data    (secs, min, hr, dow, date. mth, yr)
    
26.   Wire.requestFrom(DS1307_CTRL_ID, 7);
    
27.   for(int i=0; i<7; i++)
    
28.   {
    
29.     // store data in raw bcd format
    
30.     rtc_bcd[i]=Wire.receive();
    
31.   }
    
32. }
    
33. 
    
34. // update the data on the IC from the bcd formatted data in the buffer
    
35. void DS1307::save(void)
    
36. {
    
37.   Wire.beginTransmission(DS1307_CTRL_ID);
    
38.   Wire.send(0x00); // reset register pointer
    
39.   for(int i=0; i<7; i++)
    
40.   {
    
41.     Wire.send(rtc_bcd[i]);
    
42.   }
    
43.   Wire.endTransmission();
    
44. }
    
45. 
    
46. 
    
47. // PUBLIC FUNCTIONS
    
48. void DS1307::get(int *rtc, boolean refresh)   // Aquire data from buffer and convert to int, refresh buffer if required
    
49. {
    
50.   if(refresh) read();
    
51.   for(int i=0;i<7;i++)  // cycle through each component, create array of data
    
52.   {
    
53.         rtc[i]=get(i, 0);
    
54.   }
    
55. }
    
56. 
    
57. int DS1307::get(int c, boolean refresh)  // aquire individual RTC item from buffer, return as int, refresh buffer if required
    
58. {
    
59.   if(refresh) read();
    
60.   int v=-1;
    
61.   switch(c)
    
62.   {
    
63.   case DS1307_SEC:
    
64.     v=(10*((rtc_bcd[DS1307_SEC] & DS1307_HI_SEC)>>4))+(rtc_bcd[DS1307_SEC] & DS1307_LO_BCD);
    
65.         break;
    
66.   case DS1307_MIN:
    
67.     v=(10*((rtc_bcd[DS1307_MIN] & DS1307_HI_MIN)>>4))+(rtc_bcd[DS1307_MIN] & DS1307_LO_BCD);
    
68.         break;
    
69.   case DS1307_HR:
    
70.     v=(10*((rtc_bcd[DS1307_HR] & DS1307_HI_HR)>>4))+(rtc_bcd[DS1307_HR] & DS1307_LO_BCD);
    
71.         break;
    
72.   case DS1307_DOW:
    
73.     v=rtc_bcd[DS1307_DOW] & DS1307_LO_DOW;
    
74.         break;
    
75.   case DS1307_DATE:
    
76.     v=(10*((rtc_bcd[DS1307_DATE] & DS1307_HI_DATE)>>4))+(rtc_bcd[DS1307_DATE] & DS1307_LO_BCD);
    
77.         break;
    
78.   case DS1307_MTH:
    
79.     v=(10*((rtc_bcd[DS1307_MTH] & DS1307_HI_MTH)>>4))+(rtc_bcd[DS1307_MTH] & DS1307_LO_BCD);
    
80.         break;
    
81.   case DS1307_YR:
    
82.     v=(10*((rtc_bcd[DS1307_YR] & DS1307_HI_YR)>>4))+(rtc_bcd[DS1307_YR] & DS1307_LO_BCD)+DS1307_BASE_YR;
    
83.         break;
    
84.   } // end switch
    
85.   return v;
    
86. }
    
87. 
    
88. void DS1307::set(int c, int v)  // Update buffer, then update the chip
    
89. {
    
90.   switch(c)
    
91.   {
    
92.   case DS1307_SEC:
    
93.     if(v<60 && v>-1)
    
94.     {
    
95.         //preserve existing clock state (running/stopped)
    
96.         int state=rtc_bcd[DS1307_SEC] & DS1307_CLOCKHALT;
    
97.         rtc_bcd[DS1307_SEC]=state | ((v / 10)<<4) + (v % 10);
    
98.     }
    
99.     break;
    
100.   case DS1307_MIN:
     
101.     if(v<60 && v>-1)
     
102.     {
     
103.         rtc_bcd[DS1307_MIN]=((v / 10)<<4) + (v % 10);
     
104.     }
     
105.     break;
     
106.   case DS1307_HR:
     
107.   // TODO : AM/PM  12HR/24HR
     
108.     if(v<24 && v>-1)
     
109.     {
     
110.         rtc_bcd[DS1307_HR]=((v / 10)<<4) + (v % 10);
     
111.     }
     
112.     break;
     
113.   case DS1307_DOW:
     
114.     if(v<8 && v>-1)
     
115.     {
     
116.         rtc_bcd[DS1307_DOW]=v;
     
117.     }
     
118.     break;
     
119.   case DS1307_DATE:
     
120.     if(v<31 && v>-1)
     
121.     {
     
122.         rtc_bcd[DS1307_DATE]=((v / 10)<<4) + (v % 10);
     
123.     }
     
124.     break;
     
125.   case DS1307_MTH:
     
126.     if(v<13 && v>-1)
     
127.     {
     
128.         rtc_bcd[DS1307_MTH]=((v / 10)<<4) + (v % 10);
     
129.     }
     
130.     break;
     
131.   case DS1307_YR:
     
132.     if(v<13 && v>-1)
     
133.     {
     
134.         rtc_bcd[DS1307_YR]=((v / 10)<<4) + (v % 10);
     
135.     }
     
136.     break;
     
137.   } // end switch
     
138.   save();
     
139. }
     
140. 
     
141. void DS1307::stop(void)
     
142. {
     
143.         // set the ClockHalt bit high to stop the rtc
     
144.         // this bit is part of the seconds byte
     
145.     rtc_bcd[DS1307_SEC]=rtc_bcd[DS1307_SEC] | DS1307_CLOCKHALT;
     
146.     save();
     
147. }
     
148. 
     
149. void DS1307::start(void)
     
150. {
     
151.         // unset the ClockHalt bit to start the rtc
     
152.         // TODO : preserve existing seconds
     
153.     rtc_bcd[DS1307_SEC]=rtc_bcd[DS1307_SEC] & (~DS1307_CLOCKHALT);
     
154.         save();
     
155. }
     
156. 
     
157. 
     
158. void DS1307::SetOutput(int c)  
     
159. {
     
160.   int out;
     
161.   switch(c)
     
162.   {
     
163.   case HIGH :
     
164.         out=DS1307_HIGH_BIT;
     
165.   break;
     
166.   case LOW :
     
167.         out=DS1307_LOW_BIT;
     
168.   break;
     
169.   case DS1307_SQW1HZ :
     
170.         out=DS1307_SQW1HZ_BIT;
     
171.   break;
     
172.   case DS1307_SQW4KHZ :
     
173.         out=DS1307_SQW4KHZ_BIT;
     
174.   break;
     
175.   case DS1307_SQW8KHZ :
     
176.         out=DS1307_SQW8KHZ_BIT;
     
177.   break;
     
178.   case DS1307_SQW32KHZ :
     
179.         out=DS1307_SQW32KHZ_BIT;
     
180.   break;
     
181.   default:
     
182.         out=DS1307_LOW_BIT;
     
183.   }
     
184.   
     
185.   Wire.beginTransmission(DS1307_CTRL_ID);
     
186.   Wire.send(0x07);
     
187.   Wire.send(out);
     
188.   Wire.endTransmission();
     
189. }
     
190. 
     
191. int DS1307::GetOutput(void)  
     
192. {
     
193.   Wire.beginTransmission(DS1307_CTRL_ID);
     
194.   Wire.send(0x07);
     
195.   Wire.endTransmission();
     
196. 
     
197.   Wire.requestFrom(DS1307_CTRL_ID, 1);
     
198.   int out=Wire.receive();
     
199.   
     
200.   int c=-1;
     
201.   switch(out)
     
202.   {
     
203.   case DS1307_HIGH_BIT :
     
204.         c=HIGH;
     
205.   break;
     
206.   case DS1307_LOW_BIT :
     
207.         c=LOW;
     
208.   break;
     
209.   case DS1307_SQW1HZ_BIT :
     
210.         c=DS1307_SQW1HZ;
     
211.   break;
     
212.   case DS1307_SQW4KHZ_BIT :
     
213.         c=DS1307_SQW4KHZ;
     
214.   break;
     
215.   case DS1307_SQW8KHZ_BIT :
     
216.         c=DS1307_SQW8KHZ;
     
217.   break;
     
218.   case DS1307_SQW32KHZ_BIT :
     
219.         c=DS1307_SQW32KHZ;
     
220.   break;
     
221.   }
     
222.   return c;
     
223. }
     

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