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tests: benchmark: boot_time: fixed kernel clock value

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Using a device with a kernel clock below 1MHz (e.g. nRF52) resulted in
a division by zero. Added support for such devices by multiplying
before dividing.

Signed-off-by: Mario Noseda <mario.noseda@zhaw.ch>
This commit is contained in:
Mario Noseda 2019-10-15 08:04:48 +02:00 • committed by Anas Nashif
commit 1acea13767
1 changed files with 11 additions and 6 deletions
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17
tests/benchmarks/boot_time/src/main.c
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@ -33,14 +33,19 @@ void main(void)
*/
k_sleep(K_MSEC(1));
int freq = sys_clock_hw_cycles_per_sec() / 1000000;
main_us = z_timestamp_main / freq;
task_us = task_time_stamp / freq;
idle_us = z_timestamp_idle / freq;
main_us = (u32_t)ceiling_fraction(USEC_PER_SEC *
(u64_t)z_timestamp_main,
sys_clock_hw_cycles_per_sec());
task_us = (u32_t)ceiling_fraction(USEC_PER_SEC *
(u64_t)task_time_stamp,
sys_clock_hw_cycles_per_sec());
idle_us = (u32_t)ceiling_fraction(USEC_PER_SEC *
(u64_t)z_timestamp_idle,
sys_clock_hw_cycles_per_sec());
TC_START("Boot Time Measurement");
TC_PRINT("Boot Result: Clock Frequency: %d MHz\n", freq);
TC_PRINT("Boot Result: Clock Frequency: %d Hz\n",
sys_clock_hw_cycles_per_sec());
TC_PRINT("_start->main(): %u cycles, %u us\n", z_timestamp_main,
main_us);
TC_PRINT("_start->task : %u cycles, %u us\n", task_time_stamp,