I2C on LPC11U14

Discussion created by lpcware Employee on Jun 15, 2016
Latest reply on Jun 15, 2016 by lpcware
Content originally posted in LPCWare by JohnGrand on Tue Mar 19 12:33:00 MST 2013
Hi everyone,

I'm trying to get the I2C bus to run on the embeddedArtists LPCXpresso LPC11[B]U[/B]14 for days now.

I am using the I2C example code for the LPC1114,  and -[I]it kind of[/I]- seems to work, but
I'm not getting successful signals or flags:

My I2CSTAT register shows the value 0x18 once (which means transmitted command/data and received ACK), but only once if I step through the programm using the debugger.
If I just run the programm, 0x18 is never occours, it remains 0x8F (no useful data on bus).
(I also use this information to toggle/switch/CLR/SET an LED for external debugging).

I am starting to think, it has something to do with the LPC11U14 instead of the LPC1114, even though registers and functions seem all to be the exact same.

I tested two different I2C devices. Both of them "react" the same, well, if they react at all.

Has anyone working I2C code for the LPC11[B]U[/B]14?
I appreciate any clous!

Best regards,