systick on nrf52840 to geneate exception every 1msec

[shreeharsha]

Hi all,

can we configure systick on nrf52840 to genrate exception every 1msec.

Tried doing the same but not able to observe correct value.

These are my configuration

clocksource: cpu; Tickmask: 1; counter enable:1; LOAD: (64000-1);

But then when I read the SysTick->CALIB. The value of CALIB register is 0xc0000000. This indicates the calibration value is wrong. And also the variable value incremented in ISR also is not correct.

Can any one help on this please.

Regards, Shreeharsha I

[Sigurd]

Hi,

Systick is sourced by the same clock as the CPU, which is turned off when going to sleep(WFE/WFI), so I recommend that you look into using the app_timer(uses the RTC1 peripheral) or the TIMER peripheral instead.

See this answer about differences between RTC and TIMER peripherals.