Port 2 - Pin17 Disables Port 2 - Pin 4 with IOCON switch

Discussion created by lpcware Employee on Jun 15, 2016
Latest reply on Jun 15, 2016 by lpcware
Content originally posted in LPCWare by pcproa on Wed Dec 21 12:43:45 MST 2011

I have an LPC1788 (LQFP 208 Pin) that I'm trying to use the built in 24Bit LCD Controller and EMC to control SDRAM.

Today I noticed that the LCD_ENAB_M (P2[4]) state would never change. It would always stay low. I tried configuring it strictly as an IO pin and forcing it high.
When I set it high at the beginning of the program it would switch fine, then shut off somewhere during my device initialization. I decided to step through all of the events and found that it would return low while starting up the EMC. Specifically _EMC_RAS (P2[17]). When I take out the entire initialization sequence P2[4] will stay high the entire time.

Is anyone able to replicate this issue or has experienced something like this before? Or a solution to the problem?

Thanks in advance,