Labi Shrestha / DS1337

DS1337 RTC library RTC 55 bytes nvram

ds1337.cpp@1:8a0e272ed8e6, 2015-10-28 (annotated)

Committer:
labishrestha
Date:
Wed Oct 28 23:20:29 2015 +0000
Revision:
1:8a0e272ed8e6
Parent:
0:366fa629ac27
Child:
2:66dbf3ae0f89
Dallas Semi DS1337 RTC driver

Who changed what in which revision?

UserRevisionLine numberNew contents of line
labishrestha 0:366fa629ac27 1 #include "ds1337.h"
labishrestha 0:366fa629ac27 2
labishrestha 0:366fa629ac27 3 #define TIME_LENGTH 8 //Length of buffer needed for time/date
labishrestha 0:366fa629ac27 4
labishrestha 0:366fa629ac27 5 DS1337::DS1337(PinName sda, PinName scl) : _i2c(sda, scl)
labishrestha 0:366fa629ac27 6 {
labishrestha 0:366fa629ac27 7 _i2c.frequency(DS1337_I2C_FCY);
labishrestha 0:366fa629ac27 8 }
labishrestha 0:366fa629ac27 9
labishrestha 0:366fa629ac27 10 void DS1337::time2str(Time * t, char * str)
labishrestha 0:366fa629ac27 11 {
labishrestha 0:366fa629ac27 12 sprintf(str, "%02d/%02d/%04d-%02d:%02d:%02d",t->tm_mon, t->tm_mday,(t->tm_year+1900), t->tm_hour,t->tm_min,t->tm_sec);
labishrestha 0:366fa629ac27 13 }
labishrestha 0:366fa629ac27 14
labishrestha 0:366fa629ac27 15 bool DS1337::now(Time * now)
labishrestha 0:366fa629ac27 16 {
labishrestha 0:366fa629ac27 17 buffer[0] = 0x00; // memory address
labishrestha 0:366fa629ac27 18
labishrestha 0:366fa629ac27 19 if (_i2c.write(DS1337_ADDR, &buffer[0], 1) != 0)
labishrestha 0:366fa629ac27 20 {
labishrestha 0:366fa629ac27 21 sprintf(err, "RTC command write Failed");
labishrestha 0:366fa629ac27 22 return false;
labishrestha 0:366fa629ac27 23 }
labishrestha 0:366fa629ac27 24
labishrestha 0:366fa629ac27 25 if (_i2c.read(DS1337_ADDR, buffer, DS1337_BUFFER_SIZE) != 0)
labishrestha 0:366fa629ac27 26 {
labishrestha 0:366fa629ac27 27 sprintf(err, "RTC buffer read Failed");
labishrestha 0:366fa629ac27 28 return false;
labishrestha 0:366fa629ac27 29 }
labishrestha 0:366fa629ac27 30
labishrestha 0:366fa629ac27 31 if (buffer[0] & 0x80)
labishrestha 0:366fa629ac27 32 {
labishrestha 0:366fa629ac27 33 sprintf(err, "Clock Stopped");
labishrestha 0:366fa629ac27 34 return false;
labishrestha 0:366fa629ac27 35 }
labishrestha 0:366fa629ac27 36
labishrestha 0:366fa629ac27 37 if (buffer[2] & 0x40)
labishrestha 0:366fa629ac27 38 {
labishrestha 0:366fa629ac27 39 sprintf(err, "12hour not supported");
labishrestha 0:366fa629ac27 40 return false;
labishrestha 0:366fa629ac27 41 }
labishrestha 0:366fa629ac27 42
labishrestha 0:366fa629ac27 43 now->tm_sec = bcdToDecimal(buffer[0] & 0x7F);
labishrestha 0:366fa629ac27 44 now->tm_min = bcdToDecimal(buffer[1] & 0x7F);
labishrestha 0:366fa629ac27 45 now->tm_hour = bcdToDecimal(buffer[2] & 0x3F);
labishrestha 1:8a0e272ed8e6 46 now->tm_wday = buffer[3] & 0x07;
labishrestha 0:366fa629ac27 47 now->tm_mday = bcdToDecimal(buffer[4] & 0x3F);
labishrestha 0:366fa629ac27 48 now->tm_mon = bcdToDecimal(buffer[5] & 0x1F);
labishrestha 0:366fa629ac27 49 now->tm_year = bcdToDecimal(buffer[6] & 0xFF);
labishrestha 0:366fa629ac27 50
labishrestha 0:366fa629ac27 51 return true;
labishrestha 0:366fa629ac27 52 }
labishrestha 0:366fa629ac27 53
labishrestha 0:366fa629ac27 54 bool DS1337::set_time(Time * now)
labishrestha 0:366fa629ac27 55 {
labishrestha 0:366fa629ac27 56 buffer[0] = 0x00; // memory address
labishrestha 0:366fa629ac27 57 buffer[1] = decimalToBcd(now->tm_sec) & 0x7F;
labishrestha 0:366fa629ac27 58 buffer[2] = decimalToBcd(now->tm_min) & 0x7F;
labishrestha 0:366fa629ac27 59 buffer[3] = decimalToBcd(now->tm_hour) & 0x3F; // 24-hour format
labishrestha 0:366fa629ac27 60 buffer[4] = now->tm_wday & 0x07;
labishrestha 0:366fa629ac27 61 buffer[5] = decimalToBcd(now->tm_mday) & 0x3F;
labishrestha 0:366fa629ac27 62 buffer[6] = decimalToBcd(now->tm_mon) & 0x1F;
labishrestha 0:366fa629ac27 63 buffer[7] = decimalToBcd(now->tm_year) & 0xFF;
labishrestha 0:366fa629ac27 64
labishrestha 0:366fa629ac27 65 if (_i2c.write(DS1337_ADDR, buffer, TIME_LENGTH) != 0)
labishrestha 0:366fa629ac27 66 {
labishrestha 0:366fa629ac27 67 sprintf(err, "RTC command write Failed");
labishrestha 0:366fa629ac27 68 return false;
labishrestha 0:366fa629ac27 69 }
labishrestha 0:366fa629ac27 70
labishrestha 0:366fa629ac27 71 return true;
labishrestha 0:366fa629ac27 72 }