Execution time on nrf52840

[Vishnu Pradeep]

Hi,

What are the options to measure the execution time of code snippets? I used app_timer_cnt_get() now and is giving 50 ticks for 1ms. Is there any way I can measure lesser time?

[Jared]

Hi,

The Application timer use the LFCLK, try using the Timer peripheral instead. It uses the HFCLK.

Best regards

Jared 

[kirkus]

The cycle counter works really well for short measurements:

uint32_t start;
uint32_t stop;
uint32_t elapsed;

// enable DWT
CoreDebug->DEMCR |= 0x01000000;

// Reset cycle counter
DWT->CYCCNT = 0;

// enable cycle counter
DWT->CTRL |= 0x1;

start = DWT->CYCCNT;
nrf_delay_ms(1000);
stop = DWT->CYCCNT;
elapsed = stop-start;
NRF_LOG_INFO("cycles for nrf_delay_ms(1000) = %u", elapsed);
// <info> app: cycles for nrf_delay_ms(1000) = 64018002