I solder on spare pcb a pcf8563 acording to diagram:
PCF is connected to I2c 3 (PD_0 and PD_1). Tiva-C is flashed with code:
#include <Wire.h>
#include <RTClib.h>
RTC_PCF8563 RTC;
void setup () {
Serial.begin(57600);
Wire.setModule(3);
Wire.begin();
RTC.begin();
// following line sets the RTC to the date & time this sketch was compiled
RTC.adjust(DateTime(__DATE__, __TIME__));
}
void loop () {
DateTime now = RTC.now();
Serial.print(now.year(), DEC);
Serial.print('/');
Serial.print(now.month(), DEC);
Serial.print('/');
Serial.print(now.day(), DEC);
Serial.print(' ');
Serial.print(now.hour(), DEC);
Serial.print(':');
Serial.print(now.minute(), DEC);
Serial.print(':');
Serial.print(now.second(), DEC);
Serial.println();
delay(3000);
}
In terminal I got:
2013/12/29 17:45:31
2013/12/29 17:45:34
2032/11/17 5:37:13
2013/12/29 17:45:40
2013/12/29 17:45:43
2052/1/17 5:46:13
2013/12/29 17:45:49
2052/11/17 5:52:13
2052/11/17 5:55:52
2052/19/17 5:58:52
2013/12/29 17:46:1
2013/12/29 17:46:4
2012/1/17 6:7:13
2013/12/29 17:46:10
2012/11/17 6:13:13
2012/11/17 6:16:12
2013/12/29 17:46:19
2013/12/29 17:46:22
2032/1/17 6:25:13
2032/9/17 6:28:32
2013/12/29 17:46:31
2013/12/29 17:46:34
2032/11/17 6:37:13
2013/12/29 17:46:40
2052/1/17 6:43:13
2013/12/29 17:46:46
What is the cause of such problems? PCF not keep proper time.
The same PCB works on Arduino and the same code and libraries.
