I2C slave gives NACK (v4.081)

kender · Joined: 09 Aug 2004 Posts: 768 Location: Silicon Valley

Colleagues,

Originally, I wrote and successfully tested my code using 4.071 back in December. Since then I have updated my compiler to 4.081. I have re-compiled the old code, but now slave sends NACK where under the old compiler it was properly sending ACK. The list of recent changes shows that some problems with I2C were fixed. What has changed? What would you recommend to try?

Just in case, here's my I2C declaration:

PCM programmer · Joined: 06 Sep 2003 Posts: 21708

Print the i2c portions of the .LST files, compiled for both versions.
The compare them side-by-side on your desk. Investigate any differences.

Make sure you comment out the #nolist line at the top of the 18F4525.h
files so you will see all the ASM code when it's compiled.