I'm trying to do some very simple timing and wanted to use the low power timer as my source instead of the clunky MQX seconds & milliseconds timer.
I wanted to read the low power timer register and save that in uint16_t start. Then later read it again and store that in uint16_t stop.The following snippet shows how I get an unhandled interrupt when I step to "tmp=p->CNR;"
LPTMR_MemMapPtr p = LPTMR0_BASE_PTR;
uint16_t tmr = p->CNR;
It did not behave this way in MQX 3.7. Does this have anything to do with protected mode vs. User mode.
In "mqx_cnfg.h" I found "#define MQX_ENABLE_USER_MODE 0" (that is the default), so I didn't think this was the problem.
I would firstly check if you have enabled clock for that peripheral : SIM_SCGC5 for LPTIMER . That could cause unhandled interrupt.