18F4550, DS1307 & NOKIA 3310 LCD problem

[Simbo]

Hi

i need help trying to fix a problem i have with a little project i got on the side, i'm new to programming in C but i'm learning quick, i have some exp with pascal but thats about it.

i've used the code to drive the DS1307 from this post:
http://www.ccsinfo.com/forum/viewtopic.php?t=23255

and the NOKIA 3310 LCD driver from this post:
http://www.ccsinfo.com/forum/viewtopic.php?t=25571

i had it working fine but after i left it powered overnight and i woke to see the time and date displayed as:

45/25/-1
45:85:85

i have no idea why its done this but as far as i can see it should be working. it also displays this on the terminal if i plug it to the serial port on my pc.

any help would be awesome
cheers
_________________
<~Simbo~>

[Douglas Kennedy]

The DS1307 regs 0..7 appear to be corrupted. This can happen if the DS1307 is run without a backup battery and power fails. The other source is that a valid series of I2C writes sent the values you see into the DS1307 regs. The other possibility is that every thing inside the DS1307 is just fine but the I2C read routine is getting messed up and gives you false values.

[PCM programmer]

[Simbo]

Thank you for your help, turns out it was the simplest of things that i really didn't check.

The battery was going dead but was still powering everything else, changed it and the clock from the ds1307 came back.

lol

always the simple things
_________________
<~Simbo~>