Another DS1307 driver

[marko88]

Hi guys, I have some problems with this rtc module. I'm using the Tiny RTC module and I use the code posted here. I split in 2 files, one ds1307.c and other for the main and my program. I already can change and put the data and read it correctly, the problem is not counting after that, it means, always is show the same data and hours. In main program basically I make how I see here, init_rtc, config_rtc, write rtc, in while(1) with delay_ms(1000) read_rtc and show. Could someone help me? I appreciate.

Best regards!

[marko88]

More fast I post it more fast I solved xD The problem was the crystal, some bad soldering in module. Anyway stay here the solution for who have similar problem.

[esa]

I just try it 10 years later your first post and it works.

But, When I reset the the µP (16F877) the day is reset to '0'.

If I comment the line "ds1307_init();" then the day stay right after a Soft Reset.

Can you help please?

Thank

[chacal]

Hello! Unfortunately don´t work for me. Looks my .h file:

#include <16F886.h>
#device adc=10


#FUSES NOWDT //No Watch Dog Timer
#FUSES XT //Crystal osc <= 4mhz for PCM/PCH , 3mhz to 10 mhz for PCD
#FUSES PUT //Power Up Timer
#FUSES MCLR //Master Clear pin enabled
#FUSES NOPROTECT //Code not protected from reading
#FUSES NOCPD //No EE protection
#FUSES NOBROWNOUT //No brownout reset
#FUSES IESO //Internal External Switch Over mode enabled
#FUSES FCMEN //Fail-safe clock monitor enabled
#FUSES NOLVP //No low voltage prgming, B3(PIC16) or B5(PIC18) used for I/O
#FUSES NODEBUG //No Debug mode for ICD
#FUSES NOWRT //Program memory not write protected
#FUSES BORV40 //Brownout reset at 4.0V

#use delay(clock=4000000)
#use rs232(baud=9600,parity=N,xmit=PIN_C6,rcv=PIN_C7,bits=8)
#use i2c(Master,Fast,sda=PIN_C4,scl=PIN_C3)
#include <ds1307.c>

[esa]

In the source code, do you comment the line

#define RTC_SDA PIN_C4
#define RTC_SCL PIN_C3
#use i2c(master, sda=RTC_SDA, scl=RTC_SCL)

Are you sure I2C works for other devices?
I use soft I2C
#use i2c(Master,sda=PIN_C1,scl=PIN_C2,restart_wdt,force_sw)

If you buy the module on ebay, then it is maybe a hardware problem. I remember that I have to put a pull up resistor on SDA and SCL.