LPC1343 Newbie Question - GPIO stangeness

Discussion created by lpcware Employee on Jun 15, 2016
Latest reply on Jun 15, 2016 by lpcware
Content originally posted in LPCWare by josephfreiburg on Fri Mar 23 09:11:44 MST 2012
I sucessfully compiled and ran both the "blinky" and "systic" code from the NXP examples. I am using the Embedded Artists LPC1343 Quick Start board and the LPCxpresso debug interface. I then wanted to attach 8 LEDs to the GPIO1 bits 4-11 and let them turn on/off with the original code's LED (GPIO0 bit7). Everything worked except that bit 5 was always off and 6-7 were always on. Good, bit 4 blinked wildly, which was due to the JTAG interface. I tried the same thing with the systic code except this time with GPIO1 bits 0-7. In this case bits0-2 were always off and 3 again blinked as before.

I'm sure it's obvious, but what am I overlooking? Why don't the GPIO bits being addressed (using CMSIS 1.3 & GPIOSetDir / GPIOSetValue) work as I expected?

Kind Regards,