make i2c ds1307 realtime clock work

[artohautala]

Hi,
How to make DS1307 real time clock work...
How to set time and how to get time?
Any example program for ccs c-compiler?
I know you guys have done it before and I'm happy if
you tell me how ... for sure I can spend lot of time to do it myself.
( I'm electronic hobbyist ... no business)

I know those functions i2c I read from ccs c manual
but how to make them really work ?


brgds
-arto-

[PCM programmer]

There is a ds1307 driver in the CCS Code Library forum. Use it.

There is a schematic of the ds1307 circuit in the ds1307 data sheet.
Use it. Make sure you have the 4.7K pullup resistors, and make sure
you have the 3v lithium battery on the Vbat pin. All of this is shown
in the schematic.

[artohautala]

[temtronic]

Yes you can..
at the top of the driver ,just change the defines for which pins are used for the RTC clk and data.

[artohautala]

[temtronic]

First copy the 1307 'driver' to my_1307.c
In 'my_1307.c'...

place the following code

#define RTC_SDA PIN_B1
#define RTC_SCL PIN_B2

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


...before you see these lines...

BYTE bin2bcd(BYTE binary_value);
BYTE bcd2bin(BYTE bcd_value);

void ds1307_init(void)
{

..........

Just replace B1 and B2 with YOUR I2C pins !!

This will tell the compiler to use YOUR pins and create correct software I2C code.


Be sure to include 'my_1307.c' and remoce the original 1307 driver !