DRA80XMEVM: Performance measurements on the C7x DSP

Hi Florian,

This thread got wrongly assigned to me. Just wanted to let you know that I have notified my colleague who will provide response to this question. 

Regards

Karthik

Hi Florian,

Yes you can use the 64bit TSC on C7x and 32bit TSCL and TSCH registers for C66 for measuring CPU cycles.

The C7x DSP is running at 1GHz and C66 DSP is running at 1.25Ghz.

Regards,
Shyam

Hi Shyam,

thanks for your answer. So doing something like

#include <c7x.h>
#include <iostream>

// clock rate measured with clock speed program
static constexpr float c7x_clockRate = 1000000.0f;

// static variable to store ticks
static unsigned long m_ticks = 0;

void tic_ms() {
    m_ticks = __TSC;
}

float toc_ms() {
    const float elapsedTicks = static_cast<float>(__TSC - m_ticks);

    const float elapsedMilliseconds = elapsedTicks / c7x_clockRate;

    return elapsedMilliseconds;
}

int main()
{
    tic();

    //do something

    const uint32_t time_ms = toc();

    std::cout << "this took " << time_ms << " ms" << std::endl;

    return 0;
}

should give me a somewhat reliable time for C7x measurements?

If not, what would be another way of getting computation times?

Kind regards,

Florian