TMS570LC4357-EP: Unable to read PMU counters

Subash Sundaresan

Part Number: TMS570LC4357-EP
Other Parts Discussed in Thread: TMS570LC4357

we are using TMS570lc4357 and we would like to use PMU counters for task profiling and unfortunately it always reads as zero. I have followed the below mentioned sequence, could you please guide me to resolve the issue?

UINT32 cntr;

_pmuInit_();

_pmuEnableCountersGlobal_();

_pmuResetCounters_();

_pmuStartCounters_(0U);

CallDummy();
CallDummy();

_pmuStopCounters_(0);

cntr = _pmuGetCycleCount_();

over 3 years ago

+1 Chester Gillon over 3 years ago

Guru 92251 points

Subash Sundaresan said:
_pmuStartCounters_(0U);

The _pmuStartCounters_ assembler function writes to the Cortex-R5 c9, Count Enable Set Register

Subash Sundaresan said:
_pmuStopCounters_(0);

The _pmuStopCounters_ assembler function writes to the Cortex-R5 c9, Count Enable Clear Register

Writing to those registers takes a bit-mask which specifies which counter(s) to enable or disable.

Passing the argument zero means the enable flags for all counters remain unchanged.

If you want to use the cycle counter to measure the time for the functions under test pass pmuCYCLE_COUNTER for the counters bitmask. I.e.:

_pmuStartCounters_(pmuCYCLE_COUNTER);

CallDummy();
CallDummy();

_pmuStopCounters_(pmuCYCLE_COUNTER);

0 Subash Sundaresan over 3 years ago in reply to Chester Gillon

Prodigy 150 points

Hi Chester,

Thank you so much. Now it is working as expected.

Thank you,

Subash

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TMS570LC4357-EP: Unable to read PMU counters