Need help with simple I2C communications

PCM programmer · Joined: 06 Sep 2003 Posts: 21708

Start by programming your Slave PIC with the CCS example code
in Ex_Slave.c. It's in this directory:
c:\Program Files\Picc\Examples

Then use the sample code shown in this post for your Master PIC.
http://www.ccsinfo.com/forum/viewtopic.php?t=28097&start=9

That should work, and it will prove if your hardware is OK (ie., it has
pull-ups on the SDA and SCL lines, and a ground connection between
the two boards).

Don't try to use the 4x PLL oscillator in your initial test program.
Just run it at 10 MHz. Also, use the latest version of the compiler
or use vs. 3.249.

corbico · Joined: 23 Jan 2007 Posts: 3

Thanks to all for the info. With your help I was able to get the master / slave communications working as well as communicating with a battery pack on the smbus.