LPC43xx GPIO Group Interrupt

Discussion created by lpcware Employee on Jun 15, 2016
Content originally posted in LPCWare by an.kh. on Fri Apr 12 02:25:48 MST 2013

Hello! I need to receive pin change interrupts from many pins. 8 GPIO pin interrupts are not enough.

How the GPIO group interrupt works? I have tested it anf found the following: active levels for enabled pins goes to AND or OR element, then directly to interrupt or by using edge detector. Is this correct? For example: 2 pins are configured to low level, group interrupt to OR+EDGE. First pin goes low - interrupt rises. Then second pin goes low (with 1st low also) - interrupt will not rise because OR chema already gives 1 and there is no edge.

Is there any way to implement pin change interrupts in LPC43xx like it were in LPC13xx or LPC17xx?