Using PMU to measure execution time on LAUNCHXL2-TMS57012

Hello, 

I am trying to measure execution time using the PMU on the LAUNCHXL2-TMS57012. I have read the TI guide on the subject (SPNA138A). However, I am having some issues with the PMU. I am initializing the PMU as described in the guide, but every call to "_pmuGetEventCount_" returns 0 -- I assume this is because I have failed to properly set up the PMU, but I'm not sure what I have done wrong or left out. I have included an excerpt of my sys_main.c:

void main(void)
{
    // measurement init
    _pmuInit_();
    _pmuEnableCountersGlobal_();
    _pmuSetCountEvent_(pmuCOUNTER0, PMU_CYCLE_COUNT);

	// run the code to get everything prepped
	for (loop_count_prep=0;loop_count_prep<loop_count_prep_max;++loop_count_prep)
	{
		// user code
	}
	
	_pmuResetCounters_();
	_pmuStartCounters_(pmuCOUNTER0);
	cycles_PMU_start = _pmuGetEventCount_(pmuCOUNTER0);
	float cycles_test = _pmuGetCycleCount_();

	// run the actual code

	// take measurements
	_pmuStopCounters_(pmuCOUNTER0);
	cycles_PMU_end = _pmuGetEventCount_(pmuCOUNTER0);
	cycles_PMU_measure = cycles_PMU_end - cycles_PMU_start;
	_pmuResetCounters_();

	// take another instant measurement for compensation
	_pmuStartCounters_(pmuCOUNTER0);
	cycles_PMU_start = _pmuGetEventCount_(pmuCOUNTER0);
	_pmuStopCounters_(pmuCOUNTER0);
	cycles_PMU_end = _pmuGetEventCount_(pmuCOUNTER0);

	// compensate
	cycles_PMU_comp = cycles_PMU_end - cycles_PMU_start;

	// get the execution time
	cycles_PMU_code = cycles_PMU_measure - cycles_PMU_comp;
	time_PMU_code = cycles_PMU_code / (f_HCLK); // time_code [us], f_HCLK [MHz]
}

I have not modified sys_pmu.h or sys_pmu.asm from the output of HALcogen, which I am using to configure the device. As the PMU is (should be) configured to count CPU clock cycles and should be enabled, I'm not sure what the issue is. If anyone has any suggestions or common fixes I would greatly appreciate it.