I2C Speed Problem

[Bill Legge]

Melanie,

Thanks very much - your advice worked.

Original pull-up resistors were 10k.
Changed to 5k and all works OK - without DEFINE I2C_SLOW.

I sould have taken note of the PBP handbook that advises 4.7k!

Regards Bill Legge

[tenaja]

Bill, if speed is an issue, you might also consider reading the eeprom datasheet section on polling the chip. On a recent one I worked on, the spec was something like 5ms write time max, but there was an option to poll to see if it was done. I put that in with a 50uS delay between polls, and it ended up only taking three polls to finish!