HI,
My I2C codes for RTC ds1307 are working fine on Philips' 89c61x2 but when I'm trying to use those codes with ds89c450 I'm not able to read or write anything in the RTC. Please help...
HI Andy, The codes i'm talking about are the standard I2C codes used for RTC ds1307. The main difference i figured out is the speed of execution. The ds89c450 is much more faster than the philips microcontroller. I tried increasing the delays to overcome the problem but no success. Is there anything i can do about that?
Don't just "try" stuff - think it out!
Have you looked at the waveforms on an oscilloscope yet?
yes there is some activity on the SDA and SCL pins.it means that the i2c routines are working, isn't it?
"it means that the i2c routines are working, isn't it?"
It means that they are doing something - but are they doing the right thing?!
In particular, is the timing correct?
i checked the waveform and i found out that the start was not proper, so i changed the code and now my RTC is working but i'm getting corrupted data. The seconds are coming like this.
i initialized the sec to 00h
00 00 00 00 00 01 01 01 01 01 00 00 00 00 00 01 01 01 01 06 06 06 06 06 07 07 07 07 07 06 06 06 06 06 07 07 07 07 07 00 00 00 00 01 01 01 01 01 18 18 18 18 18 19 19 19 19 19 18 18 18 18 19 19 19 19 19 1E 1E 1E 1E 1E 1F 1F 1F 1F 1F 1E 1E 1E 1E 1E 1F 1F 1F 1F 18 18 18 18 18 19 19 19 19 19 00 00 00 00 00 01 01 01 01
the problem is in the 1st and 5th bit.
could you tell me what i can do about it?
No one ever got this kind of problem before???
so i changed the code and now
Earlier you claimed that code was "the standard code", now you say you had to change it to make it work. So you're contradicting yourself. That, along with the fact you haven't showed a shred of actual code so far, makes it near impossible to help.