DS3234.cpp

00001 #include <mbed.h>
00002 #include "DS3234.h"
00003 
00004 /*
00005  The below mentioned are the bits in Read mode.
00006  seconds 0x80
00007  minuntes 0x81
00008  hours  0x82
00009  day 0x83
00010  date 0x84
00011  month 0x85
00012  year 0x86
00013 */
00014 
00015 void set(PinName pin, struct ts t)
00016 {
00017    SPI spi(PTD6, PTD7, PTD5);
00018    uint8_t i, century;
00019 
00020     if (t.year > 2000) {
00021         century = 0x80;
00022         t.year_s = t.year - 2000;
00023     } else {
00024         century = 0;
00025         t.year_s = t.year - 1900;
00026     }
00027 
00028     uint8_t TimeDate[7] = { t.sec, t.min, t.hour, t.wday, t.mday, t.mon, t.year_s };
00029     for (i = 0; i <= 6; i++) {
00030        
00031         DigitalOut cs(pin);
00032         cs = 0;
00033         spi.write(i + 0x80);
00034         if (i == 5)
00035         spi.write(dectobcd(TimeDate[5]) + century);
00036         else
00037         spi.write(dectobcd(TimeDate[i]));
00038         cs = 1;
00039     }
00040     
00041 }
00042 void DS3234_get(PinName pin, struct ts *t)
00043 {
00044      SPI spi(PTD6, PTD7, PTD5);
00045     uint8_t TimeDate[7];        //second,minute,hour,dow,day,month,year
00046     uint8_t century = 0;
00047     uint8_t i, n;
00048     uint16_t year_full;
00049     DigitalOut cs(pin);
00050     
00051     for (i = 0; i <= 6; i++) {
00052         cs = 0;
00053         spi.write(i + 0x00);
00054         n = spi.write(0x00);
00055         
00056         if (i == 5) {           // month address also contains the century on bit7
00057             TimeDate[5] = bcdtodec(n & 0x1F);
00058             century = (n & 0x80) >> 7;
00059         } else {
00060             TimeDate[i] = bcdtodec(n);
00061         }
00062     }
00063 
00064     if (century == 1)
00065         year_full = 2000 + TimeDate[6];
00066     else
00067         year_full = 1900 + TimeDate[6];
00068 
00069     t->sec = TimeDate[0];
00070     t->min = TimeDate[1];
00071     t->hour = TimeDate[2];
00072     t->mday = TimeDate[4];
00073     t->mon = TimeDate[5];
00074     t->year = year_full;
00075     t->wday = TimeDate[3];
00076     t->year_s = TimeDate[6];
00077 }
00078 
00079 
00080 
00081 uint8_t dectobcd(const uint8_t val)
00082 {
00083     return ((val / 10 * 16) + (val % 10));
00084 }
00085 
00086 uint8_t bcdtodec(const uint8_t val)
00087 {
00088     return ((val / 16 * 10) + (val % 16));
00089 }