lpcware

I2C doesn't work (LPCXpresso 1769 EVB)

Discussion created by lpcware Employee on Jun 15, 2016
Latest reply on Jun 15, 2016 by lpcware
Content originally posted in LPCWare by PatrickChang on Thu Nov 17 03:48:24 MST 2011
Hi,
I am new to use LPCX1769 and trying to let LPC1769 MCU as a host to control the other i2c slave devices.

I had imported a project called "I2C"(from "NXP_LPCXpresso1769_MCB1700_2011-02-11.zip") and completed the project compiling.

After record the program to the flash rom, I plug the POWER-IN + GND + I2C/SCL/SDA connectors. (There are 4.7k-Ohm pull-high resistors connect to SCL and SDA)
And check it works or not.
The result shows it doesn't work.
I'd tried PORT_USED form 1 to 3, but there  is no any signal change (I plug SCL to an oscillscope, the signal is flat).

Could someone tell me what is wrong?

Outcomes